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42 1.7 mrg <h1 class="settitle">Installing GCC: Configuration</h1>
43 1.7 mrg <a name="index-Configuration-1"></a><a name="index-Installing-GCC_003a-Configuration-2"></a>
44 1.7 mrg Like most GNU software, GCC must be configured before it can be built.
45 1.7 mrg This document describes the recommended configuration procedure
46 1.7 mrg for both native and cross targets.
47 1.6 mrg
48 1.7 mrg <p>We use <var>srcdir</var> to refer to the toplevel source directory for
49 1.7 mrg GCC; we use <var>objdir</var> to refer to the toplevel build/object directory.
50 1.6 mrg
51 1.7 mrg <p>If you obtained the sources via SVN, <var>srcdir</var> must refer to the top
52 1.7 mrg <samp><span class="file">gcc</span></samp> directory, the one where the <samp><span class="file">MAINTAINERS</span></samp> file can be
53 1.7 mrg found, and not its <samp><span class="file">gcc</span></samp> subdirectory, otherwise the build will fail.
54 1.6 mrg
55 1.7 mrg <p>If either <var>srcdir</var> or <var>objdir</var> is located on an automounted NFS
56 1.7 mrg file system, the shell's built-in <samp><span class="command">pwd</span></samp> command will return
57 1.1 mrg temporary pathnames. Using these can lead to various sorts of build
58 1.7 mrg problems. To avoid this issue, set the <samp><span class="env">PWDCMD</span></samp> environment
59 1.7 mrg variable to an automounter-aware <samp><span class="command">pwd</span></samp> command, e.g.,
60 1.7 mrg <samp><span class="command">pawd</span></samp> or ‘<samp><span class="samp">amq -w</span></samp>’, during the configuration and build
61 1.1 mrg phases.
62 1.7 mrg
63 1.7 mrg <p>First, we <strong>highly</strong> recommend that GCC be built into a
64 1.1 mrg separate directory from the sources which does <strong>not</strong> reside
65 1.1 mrg within the source tree. This is how we generally build GCC; building
66 1.7 mrg where <var>srcdir</var> == <var>objdir</var> should still work, but doesn't
67 1.1 mrg get extensive testing; building where <var>objdir</var> is a subdirectory
68 1.1 mrg of <var>srcdir</var> is unsupported.
69 1.7 mrg
70 1.7 mrg <p>If you have previously built GCC in the same directory for a
71 1.7 mrg different target machine, do ‘<samp><span class="samp">make distclean</span></samp>’ to delete all files
72 1.7 mrg that might be invalid. One of the files this deletes is <samp><span class="file">Makefile</span></samp>;
73 1.7 mrg if ‘<samp><span class="samp">make distclean</span></samp>’ complains that <samp><span class="file">Makefile</span></samp> does not exist
74 1.7 mrg or issues a message like “don't know how to make distclean” it probably
75 1.1 mrg means that the directory is already suitably clean. However, with the
76 1.1 mrg recommended method of building in a separate <var>objdir</var>, you should
77 1.1 mrg simply use a different <var>objdir</var> for each target.
78 1.7 mrg
79 1.7 mrg <p>Second, when configuring a native system, either <samp><span class="command">cc</span></samp> or
80 1.7 mrg <samp><span class="command">gcc</span></samp> must be in your path or you must set <samp><span class="env">CC</span></samp> in
81 1.1 mrg your environment before running configure. Otherwise the configuration
82 1.1 mrg scripts may fail.
83 1.1 mrg
84 1.7 mrg <p>To configure GCC:
85 1.1 mrg
86 1.7 mrg <pre class="smallexample"> % mkdir <var>objdir</var>
87 1.7 mrg % cd <var>objdir</var>
88 1.7 mrg % <var>srcdir</var>/configure [<var>options</var>] [<var>target</var>]
89 1.7 mrg </pre>
90 1.7 mrg <h3 class="heading"><a name="TOC0"></a>Distributor options</h3>
91 1.1 mrg
92 1.1 mrg <p>If you will be distributing binary versions of GCC, with modifications
93 1.1 mrg to the source code, you should use the options described in this
94 1.1 mrg section to make clear that your version contains modifications.
95 1.7 mrg
96 1.7 mrg <dl>
97 1.7 mrg <dt><code>--with-pkgversion=</code><var>version</var><dd>Specify a string that identifies your package. You may wish
98 1.1 mrg to include a build number or build date. This version string will be
99 1.7 mrg included in the output of <samp><span class="command">gcc --version</span></samp>. This suffix does
100 1.7 mrg not replace the default version string, only the ‘<samp><span class="samp">GCC</span></samp>’ part.
101 1.7 mrg
102 1.7 mrg <p>The default value is ‘<samp><span class="samp">GCC</span></samp>’.
103 1.7 mrg
104 1.7 mrg <br><dt><code>--with-bugurl=</code><var>url</var><dd>Specify the URL that users should visit if they wish to report a bug.
105 1.1 mrg You are of course welcome to forward bugs reported to you to the FSF,
106 1.1 mrg if you determine that they are not bugs in your modifications.
107 1.1 mrg
108 1.7 mrg <p>The default value refers to the FSF's GCC bug tracker.
109 1.7 mrg
110 1.7 mrg </dl>
111 1.7 mrg
112 1.7 mrg <h3 class="heading"><a name="TOC1"></a>Target specification</h3>
113 1.7 mrg
114 1.7 mrg <ul>
115 1.7 mrg <li>GCC has code to correctly determine the correct value for <var>target</var>
116 1.1 mrg for nearly all native systems. Therefore, we highly recommend you do
117 1.1 mrg not provide a configure target when configuring a native compiler.
118 1.1 mrg
119 1.7 mrg <li><var>target</var> must be specified as <samp><span class="option">--target=</span><var>target</var></samp>
120 1.1 mrg when configuring a cross compiler; examples of valid targets would be
121 1.1 mrg m68k-elf, sh-elf, etc.
122 1.1 mrg
123 1.7 mrg <li>Specifying just <var>target</var> instead of <samp><span class="option">--target=</span><var>target</var></samp>
124 1.7 mrg implies that the host defaults to <var>target</var>.
125 1.7 mrg </ul>
126 1.1 mrg
127 1.7 mrg <h3 class="heading"><a name="TOC2"></a>Options specification</h3>
128 1.1 mrg
129 1.1 mrg <p>Use <var>options</var> to override several configure time options for
130 1.7 mrg GCC. A list of supported <var>options</var> follows; ‘<samp><span class="samp">configure
131 1.7 mrg --help</span></samp>’ may list other options, but those not listed below may not
132 1.1 mrg work and should not normally be used.
133 1.7 mrg
134 1.7 mrg <p>Note that each <samp><span class="option">--enable</span></samp> option has a corresponding
135 1.7 mrg <samp><span class="option">--disable</span></samp> option and that each <samp><span class="option">--with</span></samp> option has a
136 1.7 mrg corresponding <samp><span class="option">--without</span></samp> option.
137 1.7 mrg
138 1.7 mrg <dl>
139 1.7 mrg <dt><code>--prefix=</code><var>dirname</var><dd>Specify the toplevel installation
140 1.1 mrg directory. This is the recommended way to install the tools into a directory
141 1.1 mrg other than the default. The toplevel installation directory defaults to
142 1.7 mrg <samp><span class="file">/usr/local</span></samp>.
143 1.7 mrg
144 1.7 mrg <p>We <strong>highly</strong> recommend against <var>dirname</var> being the same or a
145 1.1 mrg subdirectory of <var>objdir</var> or vice versa. If specifying a directory
146 1.7 mrg beneath a user's home directory tree, some shells will not expand
147 1.7 mrg <var>dirname</var> correctly if it contains the ‘<samp><span class="samp">~</span></samp>’ metacharacter; use
148 1.7 mrg <samp><span class="env">$HOME</span></samp> instead.
149 1.7 mrg
150 1.7 mrg <p>The following standard <samp><span class="command">autoconf</span></samp> options are supported. Normally you
151 1.1 mrg should not need to use these options.
152 1.7 mrg <dl>
153 1.7 mrg <dt><code>--exec-prefix=</code><var>dirname</var><dd>Specify the toplevel installation directory for architecture-dependent
154 1.1 mrg files. The default is <samp><var>prefix</var></samp>.
155 1.7 mrg
156 1.7 mrg <br><dt><code>--bindir=</code><var>dirname</var><dd>Specify the installation directory for the executables called by users
157 1.7 mrg (such as <samp><span class="command">gcc</span></samp> and <samp><span class="command">g++</span></samp>). The default is
158 1.7 mrg <samp><var>exec-prefix</var><span class="file">/bin</span></samp>.
159 1.7 mrg
160 1.7 mrg <br><dt><code>--libdir=</code><var>dirname</var><dd>Specify the installation directory for object code libraries and
161 1.7 mrg internal data files of GCC. The default is <samp><var>exec-prefix</var><span class="file">/lib</span></samp>.
162 1.7 mrg
163 1.7 mrg <br><dt><code>--libexecdir=</code><var>dirname</var><dd>Specify the installation directory for internal executables of GCC.
164 1.7 mrg The default is <samp><var>exec-prefix</var><span class="file">/libexec</span></samp>.
165 1.7 mrg
166 1.7 mrg <br><dt><code>--with-slibdir=</code><var>dirname</var><dd>Specify the installation directory for the shared libgcc library. The
167 1.1 mrg default is <samp><var>libdir</var></samp>.
168 1.7 mrg
169 1.7 mrg <br><dt><code>--datarootdir=</code><var>dirname</var><dd>Specify the root of the directory tree for read-only architecture-independent
170 1.7 mrg data files referenced by GCC. The default is <samp><var>prefix</var><span class="file">/share</span></samp>.
171 1.7 mrg
172 1.7 mrg <br><dt><code>--infodir=</code><var>dirname</var><dd>Specify the installation directory for documentation in info format.
173 1.7 mrg The default is <samp><var>datarootdir</var><span class="file">/info</span></samp>.
174 1.7 mrg
175 1.7 mrg <br><dt><code>--datadir=</code><var>dirname</var><dd>Specify the installation directory for some architecture-independent
176 1.1 mrg data files referenced by GCC. The default is <samp><var>datarootdir</var></samp>.
177 1.7 mrg
178 1.7 mrg <br><dt><code>--docdir=</code><var>dirname</var><dd>Specify the installation directory for documentation files (other
179 1.7 mrg than Info) for GCC. The default is <samp><var>datarootdir</var><span class="file">/doc</span></samp>.
180 1.7 mrg
181 1.7 mrg <br><dt><code>--htmldir=</code><var>dirname</var><dd>Specify the installation directory for HTML documentation files.
182 1.1 mrg The default is <samp><var>docdir</var></samp>.
183 1.7 mrg
184 1.7 mrg <br><dt><code>--pdfdir=</code><var>dirname</var><dd>Specify the installation directory for PDF documentation files.
185 1.1 mrg The default is <samp><var>docdir</var></samp>.
186 1.7 mrg
187 1.7 mrg <br><dt><code>--mandir=</code><var>dirname</var><dd>Specify the installation directory for manual pages. The default is
188 1.7 mrg <samp><var>datarootdir</var><span class="file">/man</span></samp>. (Note that the manual pages are only extracts
189 1.1 mrg from the full GCC manuals, which are provided in Texinfo format. The manpages
190 1.1 mrg are derived by an automatic conversion process from parts of the full
191 1.1 mrg manual.)
192 1.7 mrg
193 1.7 mrg <br><dt><code>--with-gxx-include-dir=</code><var>dirname</var><dd>Specify
194 1.1 mrg the installation directory for G++ header files. The default depends
195 1.1 mrg on other configuration options, and differs between cross and native
196 1.1 mrg configurations.
197 1.7 mrg
198 1.7 mrg <br><dt><code>--with-specs=</code><var>specs</var><dd>Specify additional command line driver SPECS.
199 1.3 mrg This can be useful if you need to turn on a non-standard feature by
200 1.7 mrg default without modifying the compiler's source code, for instance
201 1.7 mrg <samp><span class="option">--with-specs=%{!fcommon:%{!fno-common:-fno-common}}</span></samp>.
202 1.3 mrg See “Spec Files” in the main manual
203 1.3 mrg
204 1.7 mrg </dl>
205 1.7 mrg
206 1.7 mrg <br><dt><code>--program-prefix=</code><var>prefix</var><dd>GCC supports some transformations of the names of its programs when
207 1.1 mrg installing them. This option prepends <var>prefix</var> to the names of
208 1.1 mrg programs to install in <var>bindir</var> (see above). For example, specifying
209 1.7 mrg <samp><span class="option">--program-prefix=foo-</span></samp> would result in ‘<samp><span class="samp">gcc</span></samp>’
210 1.7 mrg being installed as <samp><span class="file">/usr/local/bin/foo-gcc</span></samp>.
211 1.7 mrg
212 1.7 mrg <br><dt><code>--program-suffix=</code><var>suffix</var><dd>Appends <var>suffix</var> to the names of programs to install in <var>bindir</var>
213 1.7 mrg (see above). For example, specifying <samp><span class="option">--program-suffix=-3.1</span></samp>
214 1.7 mrg would result in ‘<samp><span class="samp">gcc</span></samp>’ being installed as
215 1.7 mrg <samp><span class="file">/usr/local/bin/gcc-3.1</span></samp>.
216 1.7 mrg
217 1.7 mrg <br><dt><code>--program-transform-name=</code><var>pattern</var><dd>Applies the ‘<samp><span class="samp">sed</span></samp>’ script <var>pattern</var> to be applied to the names
218 1.1 mrg of programs to install in <var>bindir</var> (see above). <var>pattern</var> has to
219 1.7 mrg consist of one or more basic ‘<samp><span class="samp">sed</span></samp>’ editing commands, separated by
220 1.7 mrg semicolons. For example, if you want the ‘<samp><span class="samp">gcc</span></samp>’ program name to be
221 1.7 mrg transformed to the installed program <samp><span class="file">/usr/local/bin/myowngcc</span></samp> and
222 1.7 mrg the ‘<samp><span class="samp">g++</span></samp>’ program name to be transformed to
223 1.7 mrg <samp><span class="file">/usr/local/bin/gspecial++</span></samp> without changing other program names,
224 1.1 mrg you could use the pattern
225 1.7 mrg <samp><span class="option">--program-transform-name='s/^gcc$/myowngcc/; s/^g++$/gspecial++/'</span></samp>
226 1.1 mrg to achieve this effect.
227 1.7 mrg
228 1.7 mrg <p>All three options can be combined and used together, resulting in more
229 1.1 mrg complex conversion patterns. As a basic rule, <var>prefix</var> (and
230 1.1 mrg <var>suffix</var>) are prepended (appended) before further transformations
231 1.1 mrg can happen with a special transformation script <var>pattern</var>.
232 1.7 mrg
233 1.7 mrg <p>As currently implemented, this option only takes effect for native
234 1.7 mrg builds; cross compiler binaries' names are not transformed even when a
235 1.1 mrg transformation is explicitly asked for by one of these options.
236 1.7 mrg
237 1.7 mrg <p>For native builds, some of the installed programs are also installed
238 1.1 mrg with the target alias in front of their name, as in
239 1.7 mrg ‘<samp><span class="samp">i686-pc-linux-gnu-gcc</span></samp>’. All of the above transformations happen
240 1.1 mrg before the target alias is prepended to the name—so, specifying
241 1.7 mrg <samp><span class="option">--program-prefix=foo-</span></samp> and <samp><span class="option">program-suffix=-3.1</span></samp>, the
242 1.1 mrg resulting binary would be installed as
243 1.7 mrg <samp><span class="file">/usr/local/bin/i686-pc-linux-gnu-foo-gcc-3.1</span></samp>.
244 1.7 mrg
245 1.7 mrg <p>As a last shortcoming, none of the installed Ada programs are
246 1.1 mrg transformed yet, which will be fixed in some time.
247 1.7 mrg
248 1.7 mrg <br><dt><code>--with-local-prefix=</code><var>dirname</var><dd>Specify the
249 1.1 mrg installation directory for local include files. The default is
250 1.7 mrg <samp><span class="file">/usr/local</span></samp>. Specify this option if you want the compiler to
251 1.7 mrg search directory <samp><var>dirname</var><span class="file">/include</span></samp> for locally installed
252 1.7 mrg header files <em>instead</em> of <samp><span class="file">/usr/local/include</span></samp>.
253 1.7 mrg
254 1.7 mrg <p>You should specify <samp><span class="option">--with-local-prefix</span></samp> <strong>only</strong> if your
255 1.7 mrg site has a different convention (not <samp><span class="file">/usr/local</span></samp>) for where to put
256 1.1 mrg site-specific files.
257 1.7 mrg
258 1.7 mrg <p>The default value for <samp><span class="option">--with-local-prefix</span></samp> is <samp><span class="file">/usr/local</span></samp>
259 1.7 mrg regardless of the value of <samp><span class="option">--prefix</span></samp>. Specifying
260 1.7 mrg <samp><span class="option">--prefix</span></samp> has no effect on which directory GCC searches for
261 1.1 mrg local header files. This may seem counterintuitive, but actually it is
262 1.1 mrg logical.
263 1.7 mrg
264 1.7 mrg <p>The purpose of <samp><span class="option">--prefix</span></samp> is to specify where to <em>install
265 1.7 mrg GCC</em>. The local header files in <samp><span class="file">/usr/local/include</span></samp>—if you put
266 1.1 mrg any in that directory—are not part of GCC. They are part of other
267 1.1 mrg programs—perhaps many others. (GCC installs its own header files in
268 1.7 mrg another directory which is based on the <samp><span class="option">--prefix</span></samp> value.)
269 1.7 mrg
270 1.7 mrg <p>Both the local-prefix include directory and the GCC-prefix include
271 1.7 mrg directory are part of GCC's “system include” directories. Although these
272 1.1 mrg two directories are not fixed, they need to be searched in the proper
273 1.1 mrg order for the correct processing of the include_next directive. The
274 1.1 mrg local-prefix include directory is searched before the GCC-prefix
275 1.1 mrg include directory. Another characteristic of system include directories
276 1.1 mrg is that pedantic warnings are turned off for headers in these directories.
277 1.7 mrg
278 1.7 mrg <p>Some autoconf macros add <samp><span class="option">-I </span><var>directory</var></samp> options to the
279 1.1 mrg compiler command line, to ensure that directories containing installed
280 1.7 mrg packages' headers are searched. When <var>directory</var> is one of GCC's
281 1.1 mrg system include directories, GCC will ignore the option so that system
282 1.1 mrg directories continue to be processed in the correct order. This
283 1.1 mrg may result in a search order different from what was specified but the
284 1.1 mrg directory will still be searched.
285 1.7 mrg
286 1.7 mrg <p>GCC automatically searches for ordinary libraries using
287 1.7 mrg <samp><span class="env">GCC_EXEC_PREFIX</span></samp>. Thus, when the same installation prefix is
288 1.1 mrg used for both GCC and packages, GCC will automatically search for
289 1.1 mrg both headers and libraries. This provides a configuration that is
290 1.1 mrg easy to use. GCC behaves in a manner similar to that when it is
291 1.7 mrg installed as a system compiler in <samp><span class="file">/usr</span></samp>.
292 1.7 mrg
293 1.7 mrg <p>Sites that need to install multiple versions of GCC may not want to
294 1.1 mrg use the above simple configuration. It is possible to use the
295 1.7 mrg <samp><span class="option">--program-prefix</span></samp>, <samp><span class="option">--program-suffix</span></samp> and
296 1.7 mrg <samp><span class="option">--program-transform-name</span></samp> options to install multiple versions
297 1.1 mrg into a single directory, but it may be simpler to use different prefixes
298 1.7 mrg and the <samp><span class="option">--with-local-prefix</span></samp> option to specify the location of the
299 1.1 mrg site-specific files for each version. It will then be necessary for
300 1.1 mrg users to specify explicitly the location of local site libraries
301 1.7 mrg (e.g., with <samp><span class="env">LIBRARY_PATH</span></samp>).
302 1.7 mrg
303 1.7 mrg <p>The same value can be used for both <samp><span class="option">--with-local-prefix</span></samp> and
304 1.7 mrg <samp><span class="option">--prefix</span></samp> provided it is not <samp><span class="file">/usr</span></samp>. This can be used
305 1.7 mrg to avoid the default search of <samp><span class="file">/usr/local/include</span></samp>.
306 1.7 mrg
307 1.7 mrg <p><strong>Do not</strong> specify <samp><span class="file">/usr</span></samp> as the <samp><span class="option">--with-local-prefix</span></samp>!
308 1.7 mrg The directory you use for <samp><span class="option">--with-local-prefix</span></samp> <strong>must not</strong>
309 1.7 mrg contain any of the system's standard header files. If it did contain
310 1.1 mrg them, certain programs would be miscompiled (including GNU Emacs, on
311 1.1 mrg certain targets), because this would override and nullify the header
312 1.7 mrg file corrections made by the <samp><span class="command">fixincludes</span></samp> script.
313 1.7 mrg
314 1.7 mrg <p>Indications are that people who use this option use it based on mistaken
315 1.1 mrg ideas of what it is for. People use it as if it specified where to
316 1.1 mrg install part of GCC. Perhaps they make this assumption because
317 1.1 mrg installing GCC creates the directory.
318 1.7 mrg
319 1.7 mrg <br><dt><code>--with-native-system-header-dir=</code><var>dirname</var><dd>Specifies that <var>dirname</var> is the directory that contains native system
320 1.7 mrg header files, rather than <samp><span class="file">/usr/include</span></samp>. This option is most useful
321 1.3 mrg if you are creating a compiler that should be isolated from the system
322 1.3 mrg as much as possible. It is most commonly used with the
323 1.7 mrg <samp><span class="option">--with-sysroot</span></samp> option and will cause GCC to search
324 1.3 mrg <var>dirname</var> inside the system root specified by that option.
325 1.7 mrg
326 1.7 mrg <br><dt><code>--enable-shared[=</code><var>package</var><code>[,...]]</code><dd>Build shared versions of libraries, if shared libraries are supported on
327 1.1 mrg the target platform. Unlike GCC 2.95.x and earlier, shared libraries
328 1.1 mrg are enabled by default on all platforms that support shared libraries.
329 1.7 mrg
330 1.7 mrg <p>If a list of packages is given as an argument, build shared libraries
331 1.1 mrg only for the listed packages. For other packages, only static libraries
332 1.1 mrg will be built. Package names currently recognized in the GCC tree are
333 1.7 mrg ‘<samp><span class="samp">libgcc</span></samp>’ (also known as ‘<samp><span class="samp">gcc</span></samp>’), ‘<samp><span class="samp">libstdc++</span></samp>’ (not
334 1.7 mrg ‘<samp><span class="samp">libstdc++-v3</span></samp>’), ‘<samp><span class="samp">libffi</span></samp>’, ‘<samp><span class="samp">zlib</span></samp>’, ‘<samp><span class="samp">boehm-gc</span></samp>’,
335 1.7 mrg ‘<samp><span class="samp">ada</span></samp>’, ‘<samp><span class="samp">libada</span></samp>’, ‘<samp><span class="samp">libjava</span></samp>’, ‘<samp><span class="samp">libgo</span></samp>’, and ‘<samp><span class="samp">libobjc</span></samp>’.
336 1.7 mrg Note ‘<samp><span class="samp">libiberty</span></samp>’ does not support shared libraries at all.
337 1.7 mrg
338 1.7 mrg <p>Use <samp><span class="option">--disable-shared</span></samp> to build only static libraries. Note that
339 1.7 mrg <samp><span class="option">--disable-shared</span></samp> does not accept a list of package names as
340 1.7 mrg argument, only <samp><span class="option">--enable-shared</span></samp> does.
341 1.7 mrg
342 1.7 mrg <p>Contrast with <samp><span class="option">--enable-host-shared</span></samp>, which affects <em>host</em>
343 1.5 mrg code.
344 1.7 mrg
345 1.7 mrg <br><dt><code>--enable-host-shared</code><dd>Specify that the <em>host</em> code should be built into position-independent
346 1.5 mrg machine code (with -fPIC), allowing it to be used within shared libraries,
347 1.5 mrg but yielding a slightly slower compiler.
348 1.7 mrg
349 1.7 mrg <p>This option is required when building the libgccjit.so library.
350 1.7 mrg
351 1.7 mrg <p>Contrast with <samp><span class="option">--enable-shared</span></samp>, which affects <em>target</em>
352 1.5 mrg libraries.
353 1.7 mrg
354 1.7 mrg <br><dt><code><a name="with_002dgnu_002das"></a>--with-gnu-as</code><dd>Specify that the compiler should assume that the
355 1.1 mrg assembler it finds is the GNU assembler. However, this does not modify
356 1.1 mrg the rules to find an assembler and will result in confusion if the
357 1.1 mrg assembler found is not actually the GNU assembler. (Confusion may also
358 1.1 mrg result if the compiler finds the GNU assembler but has not been
359 1.7 mrg configured with <samp><span class="option">--with-gnu-as</span></samp>.) If you have more than one
360 1.1 mrg assembler installed on your system, you may want to use this option in
361 1.7 mrg connection with <samp><span class="option">--with-as=</span><var>pathname</var></samp> or
362 1.7 mrg <samp><span class="option">--with-build-time-tools=</span><var>pathname</var></samp>.
363 1.7 mrg
364 1.7 mrg <p>The following systems are the only ones where it makes a difference
365 1.1 mrg whether you use the GNU assembler. On any other system,
366 1.7 mrg <samp><span class="option">--with-gnu-as</span></samp> has no effect.
367 1.7 mrg
368 1.7 mrg <ul>
369 1.7 mrg <li>‘<samp><span class="samp">hppa1.0-</span><var>any</var><span class="samp">-</span><var>any</var></samp>’
370 1.7 mrg <li>‘<samp><span class="samp">hppa1.1-</span><var>any</var><span class="samp">-</span><var>any</var></samp>’
371 1.7 mrg <li>‘<samp><span class="samp">sparc-sun-solaris2.</span><var>any</var></samp>’
372 1.7 mrg <li>‘<samp><span class="samp">sparc64-</span><var>any</var><span class="samp">-solaris2.</span><var>any</var></samp>’
373 1.7 mrg </ul>
374 1.7 mrg
375 1.7 mrg <br><dt><code><a name="with_002das"></a>--with-as=</code><var>pathname</var><dd>Specify that the compiler should use the assembler pointed to by
376 1.1 mrg <var>pathname</var>, rather than the one found by the standard rules to find
377 1.1 mrg an assembler, which are:
378 1.7 mrg <ul>
379 1.7 mrg <li>Unless GCC is being built with a cross compiler, check the
380 1.7 mrg <samp><var>libexec</var><span class="file">/gcc/</span><var>target</var><span class="file">/</span><var>version</var></samp> directory.
381 1.7 mrg <var>libexec</var> defaults to <samp><var>exec-prefix</var><span class="file">/libexec</span></samp>;
382 1.1 mrg <var>exec-prefix</var> defaults to <var>prefix</var>, which
383 1.7 mrg defaults to <samp><span class="file">/usr/local</span></samp> unless overridden by the
384 1.7 mrg <samp><span class="option">--prefix=</span><var>pathname</var></samp> switch described above. <var>target</var>
385 1.7 mrg is the target system triple, such as ‘<samp><span class="samp">sparc-sun-solaris2.7</span></samp>’, and
386 1.1 mrg <var>version</var> denotes the GCC version, such as 3.0.
387 1.1 mrg
388 1.7 mrg <li>If the target system is the same that you are building on, check
389 1.7 mrg operating system specific directories (e.g. <samp><span class="file">/usr/ccs/bin</span></samp> on
390 1.1 mrg Sun Solaris 2).
391 1.1 mrg
392 1.7 mrg <li>Check in the <samp><span class="env">PATH</span></samp> for a tool whose name is prefixed by the
393 1.1 mrg target system triple.
394 1.1 mrg
395 1.7 mrg <li>Check in the <samp><span class="env">PATH</span></samp> for a tool whose name is not prefixed by the
396 1.1 mrg target system triple, if the host and target system triple are
397 1.1 mrg the same (in other words, we use a host tool if it can be used for
398 1.7 mrg the target as well).
399 1.7 mrg </ul>
400 1.1 mrg
401 1.7 mrg <p>You may want to use <samp><span class="option">--with-as</span></samp> if no assembler
402 1.1 mrg is installed in the directories listed above, or if you have multiple
403 1.1 mrg assemblers installed and want to choose one that is not found by the
404 1.1 mrg above rules.
405 1.7 mrg
406 1.7 mrg <br><dt><code><a name="with_002dgnu_002dld"></a>--with-gnu-ld</code><dd>Same as <a href="#with-gnu-as"><samp><span class="option">--with-gnu-as</span></samp></a>
407 1.1 mrg but for the linker.
408 1.7 mrg
409 1.7 mrg <br><dt><code>--with-ld=</code><var>pathname</var><dd>Same as <a href="#with-as"><samp><span class="option">--with-as</span></samp></a>
410 1.1 mrg but for the linker.
411 1.7 mrg
412 1.7 mrg <br><dt><code>--with-stabs</code><dd>Specify that stabs debugging
413 1.1 mrg information should be used instead of whatever format the host normally
414 1.1 mrg uses. Normally GCC uses the same debug format as the host system.
415 1.7 mrg
416 1.7 mrg <p>On MIPS based systems and on Alphas, you must specify whether you want
417 1.1 mrg GCC to create the normal ECOFF debugging format, or to use BSD-style
418 1.1 mrg stabs passed through the ECOFF symbol table. The normal ECOFF debug
419 1.1 mrg format cannot fully handle languages other than C. BSD stabs format can
420 1.1 mrg handle other languages, but it only works with the GNU debugger GDB.
421 1.7 mrg
422 1.7 mrg <p>Normally, GCC uses the ECOFF debugging format by default; if you
423 1.7 mrg prefer BSD stabs, specify <samp><span class="option">--with-stabs</span></samp> when you configure GCC.
424 1.7 mrg
425 1.7 mrg <p>No matter which default you choose when you configure GCC, the user
426 1.7 mrg can use the <samp><span class="option">-gcoff</span></samp> and <samp><span class="option">-gstabs+</span></samp> options to specify explicitly
427 1.1 mrg the debug format for a particular compilation.
428 1.7 mrg
429 1.7 mrg <p><samp><span class="option">--with-stabs</span></samp> is meaningful on the ISC system on the 386, also, if
430 1.7 mrg <samp><span class="option">--with-gas</span></samp> is used. It selects use of stabs debugging
431 1.1 mrg information embedded in COFF output. This kind of debugging information
432 1.1 mrg supports C++ well; ordinary COFF debugging information does not.
433 1.7 mrg
434 1.7 mrg <p><samp><span class="option">--with-stabs</span></samp> is also meaningful on 386 systems running SVR4. It
435 1.1 mrg selects use of stabs debugging information embedded in ELF output. The
436 1.1 mrg C++ compiler currently (2.6.0) does not support the DWARF debugging
437 1.1 mrg information normally used on 386 SVR4 platforms; stabs provide a
438 1.1 mrg workable alternative. This requires gas and gdb, as the normal SVR4
439 1.1 mrg tools can not generate or interpret stabs.
440 1.7 mrg
441 1.7 mrg <br><dt><code>--with-tls=</code><var>dialect</var><dd>Specify the default TLS dialect, for systems were there is a choice.
442 1.3 mrg For ARM targets, possible values for <var>dialect</var> are <code>gnu</code> or
443 1.3 mrg <code>gnu2</code>, which select between the original GNU dialect and the GNU TLS
444 1.3 mrg descriptor-based dialect.
445 1.7 mrg
446 1.7 mrg <br><dt><code>--enable-multiarch</code><dd>Specify whether to enable or disable multiarch support. The default is
447 1.3 mrg to check for glibc start files in a multiarch location, and enable it
448 1.3 mrg if the files are found. The auto detection is enabled for native builds,
449 1.7 mrg and for cross builds configured with <samp><span class="option">--with-sysroot</span></samp>, and without
450 1.7 mrg <samp><span class="option">--with-native-system-header-dir</span></samp>.
451 1.3 mrg More documentation about multiarch can be found at
452 1.7 mrg <a href="https://wiki.debian.org/Multiarch">https://wiki.debian.org/Multiarch</a>.
453 1.7 mrg
454 1.7 mrg <br><dt><code>--enable-sjlj-exceptions</code><dd>Force use of the <code>setjmp</code>/<code>longjmp</code>-based scheme for exceptions.
455 1.7 mrg ‘<samp><span class="samp">configure</span></samp>’ ordinarily picks the correct value based on the platform.
456 1.6 mrg Only use this option if you are sure you need a different setting.
457 1.7 mrg
458 1.7 mrg <br><dt><code>--enable-vtable-verify</code><dd>Specify whether to enable or disable the vtable verification feature.
459 1.5 mrg Enabling this feature causes libstdc++ to be built with its virtual calls
460 1.5 mrg in verifiable mode. This means that, when linked with libvtv, every
461 1.5 mrg virtual call in libstdc++ will verify the vtable pointer through which the
462 1.5 mrg call will be made before actually making the call. If not linked with libvtv,
463 1.7 mrg the verifier will call stub functions (in libstdc++ itself) and do nothing.
464 1.5 mrg If vtable verification is disabled, then libstdc++ is not built with its
465 1.5 mrg virtual calls in verifiable mode at all. However the libvtv library will
466 1.7 mrg still be built (see <samp><span class="option">--disable-libvtv</span></samp> to turn off building libvtv).
467 1.7 mrg <samp><span class="option">--disable-vtable-verify</span></samp> is the default.
468 1.7 mrg
469 1.7 mrg <br><dt><code>--disable-multilib</code><dd>Specify that multiple target
470 1.1 mrg libraries to support different target variants, calling
471 1.1 mrg conventions, etc. should not be built. The default is to build a
472 1.1 mrg predefined set of them.
473 1.7 mrg
474 1.7 mrg <p>Some targets provide finer-grained control over which multilibs are built
475 1.7 mrg (e.g., <samp><span class="option">--disable-softfloat</span></samp>):
476 1.7 mrg <dl>
477 1.7 mrg <dt><code>arm-*-*</code><dd>fpu, 26bit, underscore, interwork, biendian, nofmult.
478 1.7 mrg
479 1.7 mrg <br><dt><code>m68*-*-*</code><dd>softfloat, m68881, m68000, m68020.
480 1.7 mrg
481 1.7 mrg <br><dt><code>mips*-*-*</code><dd>single-float, biendian, softfloat.
482 1.7 mrg
483 1.7 mrg <br><dt><code>powerpc*-*-*, rs6000*-*-*</code><dd>aix64, pthread, softfloat, powercpu, powerpccpu, powerpcos, biendian,
484 1.1 mrg sysv, aix.
485 1.1 mrg
486 1.7 mrg </dl>
487 1.7 mrg
488 1.7 mrg <br><dt><code>--with-multilib-list=</code><var>list</var><dt><code>--without-multilib-list</code><dd>Specify what multilibs to build.
489 1.7 mrg Currently only implemented for arm*-*-*, sh*-*-* and x86-64-*-linux*.
490 1.7 mrg
491 1.7 mrg <dl>
492 1.7 mrg <dt><code>arm*-*-*</code><dd><var>list</var> is either <code>default</code> or <code>aprofile</code>. Specifying
493 1.7 mrg <code>default</code> is equivalent to omitting this option while specifying
494 1.7 mrg <code>aprofile</code> builds multilibs for each combination of ISA (<code>-marm</code> or
495 1.7 mrg <code>-mthumb</code>), architecture (<code>-march=armv7-a</code>, <code>-march=armv7ve</code>,
496 1.7 mrg or <code>-march=armv8-a</code>), FPU available (none, <code>-mfpu=vfpv3-d16</code>,
497 1.7 mrg <code>-mfpu=neon</code>, <code>-mfpu=vfpv4-d16</code>, <code>-mfpu=neon-vfpv4</code> or
498 1.7 mrg <code>-mfpu=neon-fp-armv8</code> depending on architecture) and floating-point ABI
499 1.7 mrg (<code>-mfloat-abi=softfp</code> or <code>-mfloat-abi=hard</code>).
500 1.7 mrg
501 1.7 mrg <br><dt><code>sh*-*-*</code><dd><var>list</var> is a comma separated list of CPU names. These must be of the
502 1.1 mrg form <code>sh*</code> or <code>m*</code> (in which case they match the compiler option
503 1.1 mrg for that processor). The list should not contain any endian options -
504 1.7 mrg these are handled by <samp><span class="option">--with-endian</span></samp>.
505 1.7 mrg
506 1.7 mrg <p>If <var>list</var> is empty, then there will be no multilibs for extra
507 1.1 mrg processors. The multilib for the secondary endian remains enabled.
508 1.7 mrg
509 1.7 mrg <p>As a special case, if an entry in the list starts with a <code>!</code>
510 1.7 mrg (exclamation point), then it is added to the list of excluded multilibs.
511 1.7 mrg Entries of this sort should be compatible with ‘<samp><span class="samp">MULTILIB_EXCLUDES</span></samp>’
512 1.1 mrg (once the leading <code>!</code> has been stripped).
513 1.7 mrg
514 1.7 mrg <p>If <samp><span class="option">--with-multilib-list</span></samp> is not given, then a default set of
515 1.7 mrg multilibs is selected based on the value of <samp><span class="option">--target</span></samp>. This is
516 1.1 mrg usually the complete set of libraries, but some targets imply a more
517 1.1 mrg specialized subset.
518 1.7 mrg
519 1.7 mrg <p>Example 1: to configure a compiler for SH4A only, but supporting both
520 1.6 mrg endians, with little endian being the default:
521 1.7 mrg <pre class="smallexample"> --with-cpu=sh4a --with-endian=little,big --with-multilib-list=
522 1.7 mrg </pre>
523 1.7 mrg <p>Example 2: to configure a compiler for both SH4A and SH4AL-DSP, but with
524 1.1 mrg only little endian SH4AL:
525 1.7 mrg <pre class="smallexample"> --with-cpu=sh4a --with-endian=little,big \
526 1.7 mrg --with-multilib-list=sh4al,!mb/m4al
527 1.7 mrg </pre>
528 1.7 mrg <br><dt><code>x86-64-*-linux*</code><dd><var>list</var> is a comma separated list of <code>m32</code>, <code>m64</code> and
529 1.3 mrg <code>mx32</code> to enable 32-bit, 64-bit and x32 run-time libraries,
530 1.3 mrg respectively. If <var>list</var> is empty, then there will be no multilibs
531 1.3 mrg and only the default run-time library will be enabled.
532 1.7 mrg
533 1.7 mrg <p>If <samp><span class="option">--with-multilib-list</span></samp> is not given, then only 32-bit and
534 1.7 mrg 64-bit run-time libraries will be enabled.
535 1.3 mrg </dl>
536 1.3 mrg
537 1.7 mrg <br><dt><code>--with-endian=</code><var>endians</var><dd>Specify what endians to use.
538 1.1 mrg Currently only implemented for sh*-*-*.
539 1.7 mrg
540 1.7 mrg <p><var>endians</var> may be one of the following:
541 1.7 mrg <dl>
542 1.7 mrg <dt><code>big</code><dd>Use big endian exclusively.
543 1.7 mrg <br><dt><code>little</code><dd>Use little endian exclusively.
544 1.7 mrg <br><dt><code>big,little</code><dd>Use big endian by default. Provide a multilib for little endian.
545 1.7 mrg <br><dt><code>little,big</code><dd>Use little endian by default. Provide a multilib for big endian.
546 1.1 mrg </dl>
547 1.1 mrg
548 1.7 mrg <br><dt><code>--enable-threads</code><dd>Specify that the target
549 1.1 mrg supports threads. This affects the Objective-C compiler and runtime
550 1.7 mrg library, and exception handling for other languages like C++ and Java.
551 1.1 mrg On some systems, this is the default.
552 1.7 mrg
553 1.7 mrg <p>In general, the best (and, in many cases, the only known) threading
554 1.1 mrg model available will be configured for use. Beware that on some
555 1.1 mrg systems, GCC has not been taught what threading models are generally
556 1.7 mrg available for the system. In this case, <samp><span class="option">--enable-threads</span></samp> is an
557 1.7 mrg alias for <samp><span class="option">--enable-threads=single</span></samp>.
558 1.7 mrg
559 1.7 mrg <br><dt><code>--disable-threads</code><dd>Specify that threading support should be disabled for the system.
560 1.7 mrg This is an alias for <samp><span class="option">--enable-threads=single</span></samp>.
561 1.7 mrg
562 1.7 mrg <br><dt><code>--enable-threads=</code><var>lib</var><dd>Specify that
563 1.1 mrg <var>lib</var> is the thread support library. This affects the Objective-C
564 1.1 mrg compiler and runtime library, and exception handling for other languages
565 1.1 mrg like C++ and Java. The possibilities for <var>lib</var> are:
566 1.7 mrg
567 1.7 mrg <dl>
568 1.7 mrg <dt><code>aix</code><dd>AIX thread support.
569 1.7 mrg <br><dt><code>dce</code><dd>DCE thread support.
570 1.7 mrg <br><dt><code>lynx</code><dd>LynxOS thread support.
571 1.7 mrg <br><dt><code>mipssde</code><dd>MIPS SDE thread support.
572 1.7 mrg <br><dt><code>no</code><dd>This is an alias for ‘<samp><span class="samp">single</span></samp>’.
573 1.7 mrg <br><dt><code>posix</code><dd>Generic POSIX/Unix98 thread support.
574 1.7 mrg <br><dt><code>rtems</code><dd>RTEMS thread support.
575 1.7 mrg <br><dt><code>single</code><dd>Disable thread support, should work for all platforms.
576 1.7 mrg <br><dt><code>tpf</code><dd>TPF thread support.
577 1.7 mrg <br><dt><code>vxworks</code><dd>VxWorks thread support.
578 1.7 mrg <br><dt><code>win32</code><dd>Microsoft Win32 API thread support.
579 1.1 mrg </dl>
580 1.1 mrg
581 1.7 mrg <br><dt><code>--enable-tls</code><dd>Specify that the target supports TLS (Thread Local Storage). Usually
582 1.1 mrg configure can correctly determine if TLS is supported. In cases where
583 1.1 mrg it guesses incorrectly, TLS can be explicitly enabled or disabled with
584 1.7 mrg <samp><span class="option">--enable-tls</span></samp> or <samp><span class="option">--disable-tls</span></samp>. This can happen if
585 1.1 mrg the assembler supports TLS but the C library does not, or if the
586 1.1 mrg assumptions made by the configure test are incorrect.
587 1.7 mrg
588 1.7 mrg <br><dt><code>--disable-tls</code><dd>Specify that the target does not support TLS.
589 1.7 mrg This is an alias for <samp><span class="option">--enable-tls=no</span></samp>.
590 1.7 mrg
591 1.7 mrg <br><dt><code>--with-cpu=</code><var>cpu</var><dt><code>--with-cpu-32=</code><var>cpu</var><dt><code>--with-cpu-64=</code><var>cpu</var><dd>Specify which cpu variant the compiler should generate code for by default.
592 1.7 mrg <var>cpu</var> will be used as the default value of the <samp><span class="option">-mcpu=</span></samp> switch.
593 1.5 mrg This option is only supported on some targets, including ARC, ARM, i386, M68k,
594 1.7 mrg PowerPC, and SPARC. It is mandatory for ARC. The <samp><span class="option">--with-cpu-32</span></samp> and
595 1.7 mrg <samp><span class="option">--with-cpu-64</span></samp> options specify separate default CPUs for
596 1.1 mrg 32-bit and 64-bit modes; these options are only supported for i386,
597 1.7 mrg x86-64, PowerPC, and SPARC.
598 1.7 mrg
599 1.7 mrg <br><dt><code>--with-schedule=</code><var>cpu</var><dt><code>--with-arch=</code><var>cpu</var><dt><code>--with-arch-32=</code><var>cpu</var><dt><code>--with-arch-64=</code><var>cpu</var><dt><code>--with-tune=</code><var>cpu</var><dt><code>--with-tune-32=</code><var>cpu</var><dt><code>--with-tune-64=</code><var>cpu</var><dt><code>--with-abi=</code><var>abi</var><dt><code>--with-fpu=</code><var>type</var><dt><code>--with-float=</code><var>type</var><dd>These configure options provide default values for the <samp><span class="option">-mschedule=</span></samp>,
600 1.7 mrg <samp><span class="option">-march=</span></samp>, <samp><span class="option">-mtune=</span></samp>, <samp><span class="option">-mabi=</span></samp>, and <samp><span class="option">-mfpu=</span></samp>
601 1.7 mrg options and for <samp><span class="option">-mhard-float</span></samp> or <samp><span class="option">-msoft-float</span></samp>. As with
602 1.7 mrg <samp><span class="option">--with-cpu</span></samp>, which switches will be accepted and acceptable values
603 1.1 mrg of the arguments depend on the target.
604 1.7 mrg
605 1.7 mrg <br><dt><code>--with-mode=</code><var>mode</var><dd>Specify if the compiler should default to <samp><span class="option">-marm</span></samp> or <samp><span class="option">-mthumb</span></samp>.
606 1.1 mrg This option is only supported on ARM targets.
607 1.7 mrg
608 1.7 mrg <br><dt><code>--with-stack-offset=</code><var>num</var><dd>This option sets the default for the -mstack-offset=<var>num</var> option,
609 1.3 mrg and will thus generally also control the setting of this option for
610 1.3 mrg libraries. This option is only supported on Epiphany targets.
611 1.7 mrg
612 1.7 mrg <br><dt><code>--with-fpmath=</code><var>isa</var><dd>This options sets <samp><span class="option">-mfpmath=sse</span></samp> by default and specifies the default
613 1.7 mrg ISA for floating-point arithmetics. You can select either ‘<samp><span class="samp">sse</span></samp>’ which
614 1.7 mrg enables <samp><span class="option">-msse2</span></samp> or ‘<samp><span class="samp">avx</span></samp>’ which enables <samp><span class="option">-mavx</span></samp> by default.
615 1.3 mrg This option is only supported on i386 and x86-64 targets.
616 1.7 mrg
617 1.7 mrg <br><dt><code>--with-fp-32=</code><var>mode</var><dd>On MIPS targets, set the default value for the <samp><span class="option">-mfp</span></samp> option when using
618 1.5 mrg the o32 ABI. The possibilities for <var>mode</var> are:
619 1.7 mrg <dl>
620 1.7 mrg <dt><code>32</code><dd>Use the o32 FP32 ABI extension, as with the <samp><span class="option">-mfp32</span></samp> command-line
621 1.7 mrg option.
622 1.7 mrg <br><dt><code>xx</code><dd>Use the o32 FPXX ABI extension, as with the <samp><span class="option">-mfpxx</span></samp> command-line
623 1.7 mrg option.
624 1.7 mrg <br><dt><code>64</code><dd>Use the o32 FP64 ABI extension, as with the <samp><span class="option">-mfp64</span></samp> command-line
625 1.7 mrg option.
626 1.5 mrg </dl>
627 1.7 mrg In the absence of this configuration option the default is to use the o32
628 1.5 mrg FP32 ABI extension.
629 1.7 mrg
630 1.7 mrg <br><dt><code>--with-odd-spreg-32</code><dd>On MIPS targets, set the <samp><span class="option">-modd-spreg</span></samp> option by default when using
631 1.5 mrg the o32 ABI.
632 1.7 mrg
633 1.7 mrg <br><dt><code>--without-odd-spreg-32</code><dd>On MIPS targets, set the <samp><span class="option">-mno-odd-spreg</span></samp> option by default when using
634 1.5 mrg the o32 ABI. This is normally used in conjunction with
635 1.7 mrg <samp><span class="option">--with-fp-32=64</span></samp> in order to target the o32 FP64A ABI extension.
636 1.7 mrg
637 1.7 mrg <br><dt><code>--with-nan=</code><var>encoding</var><dd>On MIPS targets, set the default encoding convention to use for the
638 1.5 mrg special not-a-number (NaN) IEEE 754 floating-point data. The
639 1.5 mrg possibilities for <var>encoding</var> are:
640 1.7 mrg <dl>
641 1.7 mrg <dt><code>legacy</code><dd>Use the legacy encoding, as with the <samp><span class="option">-mnan=legacy</span></samp> command-line
642 1.7 mrg option.
643 1.7 mrg <br><dt><code>2008</code><dd>Use the 754-2008 encoding, as with the <samp><span class="option">-mnan=2008</span></samp> command-line
644 1.7 mrg option.
645 1.5 mrg </dl>
646 1.7 mrg To use this configuration option you must have an assembler version
647 1.7 mrg installed that supports the <samp><span class="option">-mnan=</span></samp> command-line option too.
648 1.5 mrg In the absence of this configuration option the default convention is
649 1.7 mrg the legacy encoding, as when neither of the <samp><span class="option">-mnan=2008</span></samp> and
650 1.7 mrg <samp><span class="option">-mnan=legacy</span></samp> command-line options has been used.
651 1.7 mrg
652 1.7 mrg <br><dt><code>--with-divide=</code><var>type</var><dd>Specify how the compiler should generate code for checking for
653 1.7 mrg division by zero. This option is only supported on the MIPS target.
654 1.1 mrg The possibilities for <var>type</var> are:
655 1.7 mrg <dl>
656 1.7 mrg <dt><code>traps</code><dd>Division by zero checks use conditional traps (this is the default on
657 1.7 mrg systems that support conditional traps).
658 1.7 mrg <br><dt><code>breaks</code><dd>Division by zero checks use the break instruction.
659 1.1 mrg </dl>
660 1.1 mrg
661 1.7 mrg <!-- If you make -with-llsc the default for additional targets, -->
662 1.7 mrg <!-- update the -with-llsc description in the MIPS section below. -->
663 1.7 mrg <br><dt><code>--with-llsc</code><dd>On MIPS targets, make <samp><span class="option">-mllsc</span></samp> the default when no
664 1.7 mrg <samp><span class="option">-mno-llsc</span></samp> option is passed. This is the default for
665 1.1 mrg Linux-based targets, as the kernel will emulate them if the ISA does
666 1.1 mrg not provide them.
667 1.7 mrg
668 1.7 mrg <br><dt><code>--without-llsc</code><dd>On MIPS targets, make <samp><span class="option">-mno-llsc</span></samp> the default when no
669 1.7 mrg <samp><span class="option">-mllsc</span></samp> option is passed.
670 1.7 mrg
671 1.7 mrg <br><dt><code>--with-synci</code><dd>On MIPS targets, make <samp><span class="option">-msynci</span></samp> the default when no
672 1.7 mrg <samp><span class="option">-mno-synci</span></samp> option is passed.
673 1.7 mrg
674 1.7 mrg <br><dt><code>--without-synci</code><dd>On MIPS targets, make <samp><span class="option">-mno-synci</span></samp> the default when no
675 1.7 mrg <samp><span class="option">-msynci</span></samp> option is passed. This is the default.
676 1.7 mrg
677 1.7 mrg <br><dt><code>--with-mips-plt</code><dd>On MIPS targets, make use of copy relocations and PLTs.
678 1.1 mrg These features are extensions to the traditional
679 1.1 mrg SVR4-based MIPS ABIs and require support from GNU binutils
680 1.1 mrg and the runtime C library.
681 1.7 mrg
682 1.7 mrg <br><dt><code>--enable-__cxa_atexit</code><dd>Define if you want to use __cxa_atexit, rather than atexit, to
683 1.7 mrg register C++ destructors for local statics and global objects.
684 1.1 mrg This is essential for fully standards-compliant handling of
685 1.1 mrg destructors, but requires __cxa_atexit in libc. This option is currently
686 1.1 mrg only available on systems with GNU libc. When enabled, this will cause
687 1.7 mrg <samp><span class="option">-fuse-cxa-atexit</span></samp> to be passed by default.
688 1.7 mrg
689 1.7 mrg <br><dt><code>--enable-gnu-indirect-function</code><dd>Define if you want to enable the <code>ifunc</code> attribute. This option is
690 1.3 mrg currently only available on systems with GNU libc on certain targets.
691 1.7 mrg
692 1.7 mrg <br><dt><code>--enable-target-optspace</code><dd>Specify that target
693 1.7 mrg libraries should be optimized for code space instead of code speed.
694 1.1 mrg This is the default for the m32r platform.
695 1.7 mrg
696 1.7 mrg <br><dt><code>--with-cpp-install-dir=</code><var>dirname</var><dd>Specify that the user visible <samp><span class="command">cpp</span></samp> program should be installed
697 1.7 mrg in <samp><var>prefix</var><span class="file">/</span><var>dirname</var><span class="file">/cpp</span></samp>, in addition to <var>bindir</var>.
698 1.7 mrg
699 1.7 mrg <br><dt><code>--enable-comdat</code><dd>Enable COMDAT group support. This is primarily used to override the
700 1.1 mrg automatically detected value.
701 1.7 mrg
702 1.7 mrg <br><dt><code>--enable-initfini-array</code><dd>Force the use of sections <code>.init_array</code> and <code>.fini_array</code>
703 1.1 mrg (instead of <code>.init</code> and <code>.fini</code>) for constructors and
704 1.7 mrg destructors. Option <samp><span class="option">--disable-initfini-array</span></samp> has the
705 1.1 mrg opposite effect. If neither option is specified, the configure script
706 1.1 mrg will try to guess whether the <code>.init_array</code> and
707 1.1 mrg <code>.fini_array</code> sections are supported and, if they are, use them.
708 1.7 mrg
709 1.7 mrg <br><dt><code>--enable-link-mutex</code><dd>When building GCC, use a mutex to avoid linking the compilers for
710 1.5 mrg multiple languages at the same time, to avoid thrashing on build
711 1.5 mrg systems with limited free memory. The default is not to use such a mutex.
712 1.7 mrg
713 1.7 mrg <br><dt><code>--enable-maintainer-mode</code><dd>The build rules that regenerate the Autoconf and Automake output files as
714 1.7 mrg well as the GCC master message catalog <samp><span class="file">gcc.pot</span></samp> are normally
715 1.1 mrg disabled. This is because it can only be rebuilt if the complete source
716 1.1 mrg tree is present. If you have changed the sources and want to rebuild the
717 1.7 mrg catalog, configuring with <samp><span class="option">--enable-maintainer-mode</span></samp> will enable
718 1.1 mrg this. Note that you need a recent version of the <code>gettext</code> tools
719 1.1 mrg to do so.
720 1.7 mrg
721 1.7 mrg <br><dt><code>--disable-bootstrap</code><dd>For a native build, the default configuration is to perform
722 1.7 mrg a 3-stage bootstrap of the compiler when ‘<samp><span class="samp">make</span></samp>’ is invoked,
723 1.1 mrg testing that GCC can compile itself correctly. If you want to disable
724 1.7 mrg this process, you can configure with <samp><span class="option">--disable-bootstrap</span></samp>.
725 1.7 mrg
726 1.7 mrg <br><dt><code>--enable-bootstrap</code><dd>In special cases, you may want to perform a 3-stage build
727 1.7 mrg even if the target and host triplets are different.
728 1.1 mrg This is possible when the host can run code compiled for
729 1.7 mrg the target (e.g. host is i686-linux, target is i486-linux).
730 1.1 mrg Starting from GCC 4.2, to do this you have to configure explicitly
731 1.7 mrg with <samp><span class="option">--enable-bootstrap</span></samp>.
732 1.7 mrg
733 1.7 mrg <br><dt><code>--enable-generated-files-in-srcdir</code><dd>Neither the .c and .h files that are generated from Bison and flex nor the
734 1.1 mrg info manuals and man pages that are built from the .texi files are present
735 1.1 mrg in the SVN development tree. When building GCC from that development tree,
736 1.1 mrg or from one of our snapshots, those generated files are placed in your
737 1.1 mrg build directory, which allows for the source to be in a readonly
738 1.1 mrg directory.
739 1.7 mrg
740 1.7 mrg <p>If you configure with <samp><span class="option">--enable-generated-files-in-srcdir</span></samp> then those
741 1.1 mrg generated files will go into the source directory. This is mainly intended
742 1.1 mrg for generating release or prerelease tarballs of the GCC sources, since it
743 1.1 mrg is not a requirement that the users of source releases to have flex, Bison,
744 1.1 mrg or makeinfo.
745 1.7 mrg
746 1.7 mrg <br><dt><code>--enable-version-specific-runtime-libs</code><dd>Specify
747 1.1 mrg that runtime libraries should be installed in the compiler specific
748 1.7 mrg subdirectory (<samp><var>libdir</var><span class="file">/gcc</span></samp>) rather than the usual places. In
749 1.7 mrg addition, ‘<samp><span class="samp">libstdc++</span></samp>’'s include files will be installed into
750 1.1 mrg <samp><var>libdir</var></samp> unless you overruled it by using
751 1.7 mrg <samp><span class="option">--with-gxx-include-dir=</span><var>dirname</var></samp>. Using this option is
752 1.1 mrg particularly useful if you intend to use several versions of GCC in
753 1.7 mrg parallel. This is currently supported by ‘<samp><span class="samp">libgfortran</span></samp>’,
754 1.7 mrg ‘<samp><span class="samp">libjava</span></samp>’, ‘<samp><span class="samp">libstdc++</span></samp>’, and ‘<samp><span class="samp">libobjc</span></samp>’.
755 1.7 mrg
756 1.7 mrg <br><dt><code><a name="WithAixSoname"></a>--with-aix-soname=‘</code><samp><span class="samp">aix</span></samp><code>’, ‘</code><samp><span class="samp">svr4</span></samp><code>’ or ‘</code><samp><span class="samp">both</span></samp><code>’</code><dd>Traditional AIX shared library versioning (versioned <code>Shared Object</code>
757 1.5 mrg files as members of unversioned <code>Archive Library</code> files named
758 1.7 mrg ‘<samp><span class="samp">lib.a</span></samp>’) causes numerous headaches for package managers. However,
759 1.5 mrg <code>Import Files</code> as members of <code>Archive Library</code> files allow for
760 1.5 mrg <strong>filename-based versioning</strong> of shared libraries as seen on Linux/SVR4,
761 1.7 mrg where this is called the "SONAME". But as they prevent static linking,
762 1.5 mrg <code>Import Files</code> may be used with <code>Runtime Linking</code> only, where the
763 1.7 mrg linker does search for ‘<samp><span class="samp">libNAME.so</span></samp>’ before ‘<samp><span class="samp">libNAME.a</span></samp>’ library
764 1.7 mrg filenames with the ‘<samp><span class="samp">-lNAME</span></samp>’ linker flag.
765 1.7 mrg
766 1.7 mrg <p><a name="AixLdCommand"></a>For detailed information please refer to the AIX
767 1.7 mrg <a href="http://www-01.ibm.com/support/knowledgecenter/search/%22the%20ld%20command%2C%20also%20called%20the%20linkage%20editor%20or%20binder%22">ld Command</a> reference.
768 1.7 mrg
769 1.7 mrg <p>As long as shared library creation is enabled, upon:
770 1.7 mrg <dl>
771 1.7 mrg <dt><code>--with-aix-soname=aix</code><br><dt><code>--with-aix-soname=both</code><dd> A (traditional AIX) <code>Shared Archive Library</code> file is created:
772 1.7 mrg <ul>
773 1.7 mrg <li>using the ‘<samp><span class="samp">libNAME.a</span></samp>’ filename scheme
774 1.7 mrg <li>with the <code>Shared Object</code> file as archive member named
775 1.7 mrg ‘<samp><span class="samp">libNAME.so.V</span></samp>’ (except for ‘<samp><span class="samp">libgcc_s</span></samp>’, where the <code>Shared
776 1.7 mrg Object</code> file is named ‘<samp><span class="samp">shr.o</span></samp>’ for backwards compatibility), which
777 1.7 mrg <ul>
778 1.7 mrg <li>is used for runtime loading from inside the ‘<samp><span class="samp">libNAME.a</span></samp>’ file
779 1.7 mrg <li>is used for dynamic loading via
780 1.7 mrg <code>dlopen("libNAME.a(libNAME.so.V)", RTLD_MEMBER)</code>
781 1.7 mrg <li>is used for shared linking
782 1.7 mrg <li>is used for static linking, so no separate <code>Static Archive
783 1.5 mrg Library</code> file is needed
784 1.7 mrg </ul>
785 1.7 mrg </ul>
786 1.7 mrg <br><dt><code>--with-aix-soname=both</code><br><dt><code>--with-aix-soname=svr4</code><dd> A (second) <code>Shared Archive Library</code> file is created:
787 1.7 mrg <ul>
788 1.7 mrg <li>using the ‘<samp><span class="samp">libNAME.so.V</span></samp>’ filename scheme
789 1.7 mrg <li>with the <code>Shared Object</code> file as archive member named
790 1.7 mrg ‘<samp><span class="samp">shr.o</span></samp>’, which
791 1.7 mrg <ul>
792 1.7 mrg <li>is created with the <code>-G linker flag</code>
793 1.7 mrg <li>has the <code>F_LOADONLY</code> flag set
794 1.7 mrg <li>is used for runtime loading from inside the ‘<samp><span class="samp">libNAME.so.V</span></samp>’ file
795 1.7 mrg <li>is used for dynamic loading via <code>dlopen("libNAME.so.V(shr.o)",
796 1.5 mrg RTLD_MEMBER)</code>
797 1.7 mrg </ul>
798 1.7 mrg <li>with the <code>Import File</code> as archive member named ‘<samp><span class="samp">shr.imp</span></samp>’,
799 1.5 mrg which
800 1.7 mrg <ul>
801 1.7 mrg <li>refers to ‘<samp><span class="samp">libNAME.so.V(shr.o)</span></samp>’ as the "SONAME", to be recorded
802 1.5 mrg in the <code>Loader Section</code> of subsequent binaries
803 1.7 mrg <li>indicates whether ‘<samp><span class="samp">libNAME.so.V(shr.o)</span></samp>’ is 32 or 64 bit
804 1.7 mrg <li>lists all the public symbols exported by ‘<samp><span class="samp">lib.so.V(shr.o)</span></samp>’,
805 1.7 mrg eventually decorated with the <code>‘</code><samp><span class="samp">weak</span></samp><code>’ Keyword</code>
806 1.7 mrg <li>is necessary for shared linking against ‘<samp><span class="samp">lib.so.V(shr.o)</span></samp>’
807 1.7 mrg </ul>
808 1.7 mrg </ul>
809 1.7 mrg A symbolic link using the ‘<samp><span class="samp">libNAME.so</span></samp>’ filename scheme is created:
810 1.7 mrg <ul>
811 1.7 mrg <li>pointing to the ‘<samp><span class="samp">libNAME.so.V</span></samp>’ <code>Shared Archive Library</code> file
812 1.7 mrg <li>to permit the <code>ld Command</code> to find ‘<samp><span class="samp">lib.so.V(shr.imp)</span></samp>’ via
813 1.7 mrg the ‘<samp><span class="samp">-lNAME</span></samp>’ argument (requires <code>Runtime Linking</code> to be enabled)
814 1.7 mrg <li>to permit dynamic loading of ‘<samp><span class="samp">lib.so.V(shr.o)</span></samp>’ without the need
815 1.7 mrg to specify the version number via <code>dlopen("libNAME.so(shr.o)",
816 1.5 mrg RTLD_MEMBER)</code>
817 1.7 mrg </ul>
818 1.7 mrg </dl>
819 1.5 mrg
820 1.7 mrg <p>As long as static library creation is enabled, upon:
821 1.7 mrg <dl>
822 1.7 mrg <dt><code>--with-aix-soname=svr4</code><dd> A <code>Static Archive Library</code> is created:
823 1.7 mrg <ul>
824 1.7 mrg <li>using the ‘<samp><span class="samp">libNAME.a</span></samp>’ filename scheme
825 1.7 mrg <li>with all the <code>Static Object</code> files as archive members, which
826 1.7 mrg <ul>
827 1.7 mrg <li>are used for static linking
828 1.7 mrg </ul>
829 1.7 mrg </ul>
830 1.7 mrg </dl>
831 1.5 mrg
832 1.7 mrg <p>While the aix-soname=‘<samp><span class="samp">svr4</span></samp>’ option does not create <code>Shared Object</code>
833 1.5 mrg files as members of unversioned <code>Archive Library</code> files any more, package
834 1.5 mrg managers still are responsible to
835 1.5 mrg <a href="./specific.html#TransferAixShobj">transfer</a> <code>Shared Object</code> files
836 1.5 mrg found as member of a previously installed unversioned <code>Archive Library</code>
837 1.5 mrg file into the newly installed <code>Archive Library</code> file with the same
838 1.5 mrg filename.
839 1.7 mrg
840 1.7 mrg <p><em>WARNING:</em> Creating <code>Shared Object</code> files with <code>Runtime Linking</code>
841 1.5 mrg enabled may bloat the TOC, eventually leading to <code>TOC overflow</code> errors,
842 1.7 mrg requiring the use of either the <samp><span class="option">-Wl,-bbigtoc</span></samp> linker flag (seen to
843 1.5 mrg break with the <code>GDB</code> debugger) or some of the TOC-related compiler flags,
844 1.5 mrg see “RS/6000 and PowerPC Options” in the main manual.
845 1.7 mrg
846 1.7 mrg <p><samp><span class="option">--with-aix-soname</span></samp> is currently supported by ‘<samp><span class="samp">libgcc_s</span></samp>’ only, so
847 1.5 mrg this option is still experimental and not for normal use yet.
848 1.7 mrg
849 1.7 mrg <p>Default is the traditional behavior <samp><span class="option">--with-aix-soname=‘</span><samp><span class="samp">aix</span></samp><span class="option">’</span></samp>.
850 1.7 mrg
851 1.7 mrg <br><dt><code>--enable-languages=</code><var>lang1</var><code>,</code><var>lang2</var><code>,...</code><dd>Specify that only a particular subset of compilers and
852 1.1 mrg their runtime libraries should be built. For a list of valid values for
853 1.1 mrg <var>langN</var> you can issue the following command in the
854 1.7 mrg <samp><span class="file">gcc</span></samp> directory of your GCC source tree:<br>
855 1.7 mrg <pre class="smallexample"> grep ^language= */config-lang.in
856 1.7 mrg </pre>
857 1.7 mrg <p>Currently, you can use any of the following:
858 1.3 mrg <code>all</code>, <code>ada</code>, <code>c</code>, <code>c++</code>, <code>fortran</code>,
859 1.7 mrg <code>go</code>, <code>java</code>, <code>jit</code>, <code>lto</code>, <code>objc</code>, <code>obj-c++</code>.
860 1.7 mrg Building the Ada compiler has special requirements, see below.
861 1.1 mrg If you do not pass this flag, or specify the option <code>all</code>, then all
862 1.7 mrg default languages available in the <samp><span class="file">gcc</span></samp> sub-tree will be configured.
863 1.7 mrg Ada, Go, Jit, and Objective-C++ are not default languages. LTO is not a
864 1.7 mrg default language, but is built by default because <samp><span class="option">--enable-lto</span></samp> is
865 1.7 mrg enabled by default. The other languages are default languages.
866 1.7 mrg
867 1.7 mrg <br><dt><code>--enable-stage1-languages=</code><var>lang1</var><code>,</code><var>lang2</var><code>,...</code><dd>Specify that a particular subset of compilers and their runtime
868 1.1 mrg libraries should be built with the system C compiler during stage 1 of
869 1.1 mrg the bootstrap process, rather than only in later stages with the
870 1.1 mrg bootstrapped C compiler. The list of valid values is the same as for
871 1.7 mrg <samp><span class="option">--enable-languages</span></samp>, and the option <code>all</code> will select all
872 1.7 mrg of the languages enabled by <samp><span class="option">--enable-languages</span></samp>. This option is
873 1.1 mrg primarily useful for GCC development; for instance, when a development
874 1.1 mrg version of the compiler cannot bootstrap due to compiler bugs, or when
875 1.1 mrg one is debugging front ends other than the C front end. When this
876 1.1 mrg option is used, one can then build the target libraries for the
877 1.7 mrg specified languages with the stage-1 compiler by using <samp><span class="command">make
878 1.7 mrg stage1-bubble all-target</span></samp>, or run the testsuite on the stage-1 compiler
879 1.7 mrg for the specified languages using <samp><span class="command">make stage1-start check-gcc</span></samp>.
880 1.7 mrg
881 1.7 mrg <br><dt><code>--disable-libada</code><dd>Specify that the run-time libraries and tools used by GNAT should not
882 1.1 mrg be built. This can be useful for debugging, or for compatibility with
883 1.1 mrg previous Ada build procedures, when it was required to explicitly
884 1.7 mrg do a ‘<samp><span class="samp">make -C gcc gnatlib_and_tools</span></samp>’.
885 1.7 mrg
886 1.7 mrg <br><dt><code>--disable-libsanitizer</code><dd>Specify that the run-time libraries for the various sanitizers should
887 1.5 mrg not be built.
888 1.7 mrg
889 1.7 mrg <br><dt><code>--disable-libssp</code><dd>Specify that the run-time libraries for stack smashing protection
890 1.1 mrg should not be built.
891 1.7 mrg
892 1.7 mrg <br><dt><code>--disable-libquadmath</code><dd>Specify that the GCC quad-precision math library should not be built.
893 1.3 mrg On some systems, the library is required to be linkable when building
894 1.7 mrg the Fortran front end, unless <samp><span class="option">--disable-libquadmath-support</span></samp>
895 1.3 mrg is used.
896 1.7 mrg
897 1.7 mrg <br><dt><code>--disable-libquadmath-support</code><dd>Specify that the Fortran front end and <code>libgfortran</code> do not add
898 1.3 mrg support for <code>libquadmath</code> on systems supporting it.
899 1.7 mrg
900 1.7 mrg <br><dt><code>--disable-libgomp</code><dd>Specify that the GNU Offloading and Multi Processing Runtime Library
901 1.5 mrg should not be built.
902 1.7 mrg
903 1.7 mrg <br><dt><code>--disable-libvtv</code><dd>Specify that the run-time libraries used by vtable verification
904 1.5 mrg should not be built.
905 1.7 mrg
906 1.7 mrg <br><dt><code>--with-dwarf2</code><dd>Specify that the compiler should
907 1.1 mrg use DWARF 2 debugging information as the default.
908 1.7 mrg
909 1.7 mrg <br><dt><code>--with-advance-toolchain=</code><var>at</var><dd>On 64-bit PowerPC Linux systems, configure the compiler to use the
910 1.7 mrg header files, library files, and the dynamic linker from the Advance
911 1.7 mrg Toolchain release <var>at</var> instead of the default versions that are
912 1.7 mrg provided by the Linux distribution. In general, this option is
913 1.7 mrg intended for the developers of GCC, and it is not intended for general
914 1.7 mrg use.
915 1.7 mrg
916 1.7 mrg <br><dt><code>--enable-targets=all</code><dt><code>--enable-targets=</code><var>target_list</var><dd>Some GCC targets, e.g. powerpc64-linux, build bi-arch compilers.
917 1.1 mrg These are compilers that are able to generate either 64-bit or 32-bit
918 1.7 mrg code. Typically, the corresponding 32-bit target, e.g.
919 1.1 mrg powerpc-linux for powerpc64-linux, only generates 32-bit code. This
920 1.1 mrg option enables the 32-bit target to be a bi-arch compiler, which is
921 1.1 mrg useful when you want a bi-arch compiler that defaults to 32-bit, and
922 1.7 mrg you are building a bi-arch or multi-arch binutils in a combined tree.
923 1.1 mrg On mips-linux, this will build a tri-arch compiler (ABI o32/n32/64),
924 1.7 mrg defaulted to o32.
925 1.3 mrg Currently, this option only affects sparc-linux, powerpc-linux, x86-linux,
926 1.3 mrg mips-linux and s390-linux.
927 1.7 mrg
928 1.7 mrg <br><dt><code>--enable-default-pie</code><dd>Turn on <samp><span class="option">-fPIE</span></samp> and <samp><span class="option">-pie</span></samp> by default.
929 1.7 mrg
930 1.7 mrg <br><dt><code>--enable-secureplt</code><dd>This option enables <samp><span class="option">-msecure-plt</span></samp> by default for powerpc-linux.
931 1.1 mrg See “RS/6000 and PowerPC Options” in the main manual
932 1.7 mrg
933 1.7 mrg <br><dt><code>--enable-default-ssp</code><dd>Turn on <samp><span class="option">-fstack-protector-strong</span></samp> by default.
934 1.7 mrg
935 1.7 mrg <br><dt><code>--enable-cld</code><dd>This option enables <samp><span class="option">-mcld</span></samp> by default for 32-bit x86 targets.
936 1.1 mrg See “i386 and x86-64 Options” in the main manual
937 1.7 mrg
938 1.7 mrg <br><dt><code>--enable-win32-registry</code><dt><code>--enable-win32-registry=</code><var>key</var><dt><code>--disable-win32-registry</code><dd>The <samp><span class="option">--enable-win32-registry</span></samp> option enables Microsoft Windows-hosted GCC
939 1.1 mrg to look up installations paths in the registry using the following key:
940 1.1 mrg
941 1.7 mrg <pre class="smallexample"> <code>HKEY_LOCAL_MACHINE\SOFTWARE\Free Software Foundation\</code><var>key</var>
942 1.7 mrg </pre>
943 1.7 mrg <p><var>key</var> defaults to GCC version number, and can be overridden by the
944 1.7 mrg <samp><span class="option">--enable-win32-registry=</span><var>key</var></samp> option. Vendors and distributors
945 1.1 mrg who use custom installers are encouraged to provide a different key,
946 1.1 mrg perhaps one comprised of vendor name and GCC version number, to
947 1.1 mrg avoid conflict with existing installations. This feature is enabled
948 1.7 mrg by default, and can be disabled by <samp><span class="option">--disable-win32-registry</span></samp>
949 1.1 mrg option. This option has no effect on the other hosts.
950 1.7 mrg
951 1.7 mrg <br><dt><code>--nfp</code><dd>Specify that the machine does not have a floating point unit. This
952 1.7 mrg option only applies to ‘<samp><span class="samp">m68k-sun-sunos</span><var>n</var></samp>’. On any other
953 1.7 mrg system, <samp><span class="option">--nfp</span></samp> has no effect.
954 1.7 mrg
955 1.7 mrg <br><dt><code>--enable-werror</code><dt><code>--disable-werror</code><dt><code>--enable-werror=yes</code><dt><code>--enable-werror=no</code><dd>When you specify this option, it controls whether certain files in the
956 1.7 mrg compiler are built with <samp><span class="option">-Werror</span></samp> in bootstrap stage2 and later.
957 1.7 mrg If you don't specify it, <samp><span class="option">-Werror</span></samp> is turned on for the main
958 1.1 mrg development trunk. However it defaults to off for release branches and
959 1.7 mrg final releases. The specific files which get <samp><span class="option">-Werror</span></samp> are
960 1.1 mrg controlled by the Makefiles.
961 1.7 mrg
962 1.7 mrg <br><dt><code>--enable-checking</code><dt><code>--enable-checking=</code><var>list</var><dd>When you specify this option, the compiler is built to perform internal
963 1.1 mrg consistency checks of the requested complexity. This does not change the
964 1.1 mrg generated code, but adds error checking within the compiler. This will
965 1.1 mrg slow down the compiler and may only work properly if you are building
966 1.7 mrg the compiler with GCC. This is ‘<samp><span class="samp">yes</span></samp>’ by default when building
967 1.7 mrg from SVN or snapshots, but ‘<samp><span class="samp">release</span></samp>’ for releases. The default
968 1.7 mrg for building the stage1 compiler is ‘<samp><span class="samp">yes</span></samp>’. More control
969 1.1 mrg over the checks may be had by specifying <var>list</var>. The categories of
970 1.7 mrg checks available are ‘<samp><span class="samp">yes</span></samp>’ (most common checks
971 1.7 mrg ‘<samp><span class="samp">assert,misc,tree,gc,rtlflag,runtime</span></samp>’), ‘<samp><span class="samp">no</span></samp>’ (no checks at
972 1.7 mrg all), ‘<samp><span class="samp">all</span></samp>’ (all but ‘<samp><span class="samp">valgrind</span></samp>’), ‘<samp><span class="samp">release</span></samp>’ (cheapest
973 1.7 mrg checks ‘<samp><span class="samp">assert,runtime</span></samp>’) or ‘<samp><span class="samp">none</span></samp>’ (same as ‘<samp><span class="samp">no</span></samp>’).
974 1.7 mrg Individual checks can be enabled with these flags ‘<samp><span class="samp">assert</span></samp>’,
975 1.7 mrg ‘<samp><span class="samp">df</span></samp>’, ‘<samp><span class="samp">fold</span></samp>’, ‘<samp><span class="samp">gc</span></samp>’, ‘<samp><span class="samp">gcac</span></samp>’ ‘<samp><span class="samp">misc</span></samp>’, ‘<samp><span class="samp">rtl</span></samp>’,
976 1.7 mrg ‘<samp><span class="samp">rtlflag</span></samp>’, ‘<samp><span class="samp">runtime</span></samp>’, ‘<samp><span class="samp">tree</span></samp>’, and ‘<samp><span class="samp">valgrind</span></samp>’.
977 1.7 mrg
978 1.7 mrg <p>The ‘<samp><span class="samp">valgrind</span></samp>’ check requires the external <samp><span class="command">valgrind</span></samp>
979 1.1 mrg simulator, available from <a href="http://valgrind.org/">http://valgrind.org/</a>. The
980 1.7 mrg ‘<samp><span class="samp">df</span></samp>’, ‘<samp><span class="samp">rtl</span></samp>’, ‘<samp><span class="samp">gcac</span></samp>’ and ‘<samp><span class="samp">valgrind</span></samp>’ checks are very expensive.
981 1.7 mrg To disable all checking, ‘<samp><span class="samp">--disable-checking</span></samp>’ or
982 1.7 mrg ‘<samp><span class="samp">--enable-checking=none</span></samp>’ must be explicitly requested. Disabling
983 1.1 mrg assertions will make the compiler and runtime slightly faster but
984 1.1 mrg increase the risk of undetected internal errors causing wrong code to be
985 1.1 mrg generated.
986 1.7 mrg
987 1.7 mrg <br><dt><code>--disable-stage1-checking</code><dt><code>--enable-stage1-checking</code><dt><code>--enable-stage1-checking=</code><var>list</var><dd>If no <samp><span class="option">--enable-checking</span></samp> option is specified the stage1
988 1.7 mrg compiler will be built with ‘<samp><span class="samp">yes</span></samp>’ checking enabled, otherwise
989 1.1 mrg the stage1 checking flags are the same as specified by
990 1.7 mrg <samp><span class="option">--enable-checking</span></samp>. To build the stage1 compiler with
991 1.7 mrg different checking options use <samp><span class="option">--enable-stage1-checking</span></samp>.
992 1.7 mrg The list of checking options is the same as for <samp><span class="option">--enable-checking</span></samp>.
993 1.1 mrg If your system is too slow or too small to bootstrap a released compiler
994 1.7 mrg with checking for stage1 enabled, you can use ‘<samp><span class="samp">--disable-stage1-checking</span></samp>’
995 1.1 mrg to disable checking for the stage1 compiler.
996 1.7 mrg
997 1.7 mrg <br><dt><code>--enable-coverage</code><dt><code>--enable-coverage=</code><var>level</var><dd>With this option, the compiler is built to collect self coverage
998 1.1 mrg information, every time it is run. This is for internal development
999 1.1 mrg purposes, and only works when the compiler is being built with gcc. The
1000 1.1 mrg <var>level</var> argument controls whether the compiler is built optimized or
1001 1.7 mrg not, values are ‘<samp><span class="samp">opt</span></samp>’ and ‘<samp><span class="samp">noopt</span></samp>’. For coverage analysis you
1002 1.1 mrg want to disable optimization, for performance analysis you want to
1003 1.1 mrg enable optimization. When coverage is enabled, the default level is
1004 1.1 mrg without optimization.
1005 1.7 mrg
1006 1.7 mrg <br><dt><code>--enable-gather-detailed-mem-stats</code><dd>When this option is specified more detailed information on memory
1007 1.1 mrg allocation is gathered. This information is printed when using
1008 1.7 mrg <samp><span class="option">-fmem-report</span></samp>.
1009 1.7 mrg
1010 1.7 mrg <br><dt><code>--enable-valgrind-annotations</code><dd>Mark selected memory related operations in the compiler when run under
1011 1.7 mrg valgrind to suppress false positives.
1012 1.7 mrg
1013 1.7 mrg <br><dt><code>--enable-nls</code><dt><code>--disable-nls</code><dd>The <samp><span class="option">--enable-nls</span></samp> option enables Native Language Support (NLS),
1014 1.1 mrg which lets GCC output diagnostics in languages other than American
1015 1.1 mrg English. Native Language Support is enabled by default if not doing a
1016 1.7 mrg canadian cross build. The <samp><span class="option">--disable-nls</span></samp> option disables NLS.
1017 1.7 mrg
1018 1.7 mrg <br><dt><code>--with-included-gettext</code><dd>If NLS is enabled, the <samp><span class="option">--with-included-gettext</span></samp> option causes the build
1019 1.7 mrg procedure to prefer its copy of GNU <samp><span class="command">gettext</span></samp>.
1020 1.7 mrg
1021 1.7 mrg <br><dt><code>--with-catgets</code><dd>If NLS is enabled, and if the host lacks <code>gettext</code> but has the
1022 1.1 mrg inferior <code>catgets</code> interface, the GCC build procedure normally
1023 1.7 mrg ignores <code>catgets</code> and instead uses GCC's copy of the GNU
1024 1.7 mrg <code>gettext</code> library. The <samp><span class="option">--with-catgets</span></samp> option causes the
1025 1.7 mrg build procedure to use the host's <code>catgets</code> in this situation.
1026 1.7 mrg
1027 1.7 mrg <br><dt><code>--with-libiconv-prefix=</code><var>dir</var><dd>Search for libiconv header files in <samp><var>dir</var><span class="file">/include</span></samp> and
1028 1.7 mrg libiconv library files in <samp><var>dir</var><span class="file">/lib</span></samp>.
1029 1.7 mrg
1030 1.7 mrg <br><dt><code>--enable-obsolete</code><dd>Enable configuration for an obsoleted system. If you attempt to
1031 1.1 mrg configure GCC for a system (build, host, or target) which has been
1032 1.1 mrg obsoleted, and you do not specify this flag, configure will halt with an
1033 1.1 mrg error message.
1034 1.7 mrg
1035 1.7 mrg <p>All support for systems which have been obsoleted in one release of GCC
1036 1.1 mrg is removed entirely in the next major release, unless someone steps
1037 1.1 mrg forward to maintain the port.
1038 1.7 mrg
1039 1.7 mrg <br><dt><code>--enable-decimal-float</code><dt><code>--enable-decimal-float=yes</code><dt><code>--enable-decimal-float=no</code><dt><code>--enable-decimal-float=bid</code><dt><code>--enable-decimal-float=dpd</code><dt><code>--disable-decimal-float</code><dd>Enable (or disable) support for the C decimal floating point extension
1040 1.1 mrg that is in the IEEE 754-2008 standard. This is enabled by default only
1041 1.1 mrg on PowerPC, i386, and x86_64 GNU/Linux systems. Other systems may also
1042 1.1 mrg support it, but require the user to specifically enable it. You can
1043 1.1 mrg optionally control which decimal floating point format is used (either
1044 1.7 mrg ‘<samp><span class="samp">bid</span></samp>’ or ‘<samp><span class="samp">dpd</span></samp>’). The ‘<samp><span class="samp">bid</span></samp>’ (binary integer decimal)
1045 1.7 mrg format is default on i386 and x86_64 systems, and the ‘<samp><span class="samp">dpd</span></samp>’
1046 1.1 mrg (densely packed decimal) format is default on PowerPC systems.
1047 1.7 mrg
1048 1.7 mrg <br><dt><code>--enable-fixed-point</code><dt><code>--disable-fixed-point</code><dd>Enable (or disable) support for C fixed-point arithmetic.
1049 1.1 mrg This option is enabled by default for some targets (such as MIPS) which
1050 1.1 mrg have hardware-support for fixed-point operations. On other targets, you
1051 1.1 mrg may enable this option manually.
1052 1.7 mrg
1053 1.7 mrg <br><dt><code>--with-long-double-128</code><dd>Specify if <code>long double</code> type should be 128-bit by default on selected
1054 1.1 mrg GNU/Linux architectures. If using <code>--without-long-double-128</code>,
1055 1.7 mrg <code>long double</code> will be by default 64-bit, the same as <code>double</code> type.
1056 1.1 mrg When neither of these configure options are used, the default will be
1057 1.1 mrg 128-bit <code>long double</code> when built against GNU C Library 2.4 and later,
1058 1.1 mrg 64-bit <code>long double</code> otherwise.
1059 1.7 mrg
1060 1.7 mrg <br><dt><code>--enable-fdpic</code><dd>On SH Linux systems, generate ELF FDPIC code.
1061 1.7 mrg
1062 1.7 mrg <br><dt><code>--with-gmp=</code><var>pathname</var><dt><code>--with-gmp-include=</code><var>pathname</var><dt><code>--with-gmp-lib=</code><var>pathname</var><dt><code>--with-mpfr=</code><var>pathname</var><dt><code>--with-mpfr-include=</code><var>pathname</var><dt><code>--with-mpfr-lib=</code><var>pathname</var><dt><code>--with-mpc=</code><var>pathname</var><dt><code>--with-mpc-include=</code><var>pathname</var><dt><code>--with-mpc-lib=</code><var>pathname</var><dd>If you want to build GCC but do not have the GMP library, the MPFR
1063 1.1 mrg library and/or the MPC library installed in a standard location and
1064 1.3 mrg do not have their sources present in the GCC source tree then you
1065 1.3 mrg can explicitly specify the directory where they are installed
1066 1.7 mrg (‘<samp><span class="samp">--with-gmp=</span><var>gmpinstalldir</var></samp>’,
1067 1.7 mrg ‘<samp><span class="samp">--with-mpfr=</span><var>mpfrinstalldir</var></samp>’,
1068 1.7 mrg ‘<samp><span class="samp">--with-mpc=</span><var>mpcinstalldir</var></samp>’). The
1069 1.7 mrg <samp><span class="option">--with-gmp=</span><var>gmpinstalldir</var></samp> option is shorthand for
1070 1.7 mrg <samp><span class="option">--with-gmp-lib=</span><var>gmpinstalldir</var><span class="option">/lib</span></samp> and
1071 1.7 mrg <samp><span class="option">--with-gmp-include=</span><var>gmpinstalldir</var><span class="option">/include</span></samp>. Likewise the
1072 1.7 mrg <samp><span class="option">--with-mpfr=</span><var>mpfrinstalldir</var></samp> option is shorthand for
1073 1.7 mrg <samp><span class="option">--with-mpfr-lib=</span><var>mpfrinstalldir</var><span class="option">/lib</span></samp> and
1074 1.7 mrg <samp><span class="option">--with-mpfr-include=</span><var>mpfrinstalldir</var><span class="option">/include</span></samp>, also the
1075 1.7 mrg <samp><span class="option">--with-mpc=</span><var>mpcinstalldir</var></samp> option is shorthand for
1076 1.7 mrg <samp><span class="option">--with-mpc-lib=</span><var>mpcinstalldir</var><span class="option">/lib</span></samp> and
1077 1.7 mrg <samp><span class="option">--with-mpc-include=</span><var>mpcinstalldir</var><span class="option">/include</span></samp>. If these
1078 1.1 mrg shorthand assumptions are not correct, you can use the explicit
1079 1.3 mrg include and lib options directly. You might also need to ensure the
1080 1.3 mrg shared libraries can be found by the dynamic linker when building and
1081 1.3 mrg using GCC, for example by setting the runtime shared library path
1082 1.7 mrg variable (<samp><span class="env">LD_LIBRARY_PATH</span></samp> on GNU/Linux and Solaris systems).
1083 1.7 mrg
1084 1.7 mrg <p>These flags are applicable to the host platform only. When building
1085 1.3 mrg a cross compiler, they will not be used to configure target libraries.
1086 1.7 mrg
1087 1.7 mrg <br><dt><code>--with-isl=</code><var>pathname</var><dt><code>--with-isl-include=</code><var>pathname</var><dt><code>--with-isl-lib=</code><var>pathname</var><dd>If you do not have the isl library installed in a standard location and you
1088 1.5 mrg want to build GCC, you can explicitly specify the directory where it is
1089 1.7 mrg installed (‘<samp><span class="samp">--with-isl=</span><var>islinstalldir</var></samp>’). The
1090 1.7 mrg <samp><span class="option">--with-isl=</span><var>islinstalldir</var></samp> option is shorthand for
1091 1.7 mrg <samp><span class="option">--with-isl-lib=</span><var>islinstalldir</var><span class="option">/lib</span></samp> and
1092 1.7 mrg <samp><span class="option">--with-isl-include=</span><var>islinstalldir</var><span class="option">/include</span></samp>. If this
1093 1.5 mrg shorthand assumption is not correct, you can use the explicit
1094 1.1 mrg include and lib options directly.
1095 1.7 mrg
1096 1.7 mrg <p>These flags are applicable to the host platform only. When building
1097 1.3 mrg a cross compiler, they will not be used to configure target libraries.
1098 1.7 mrg
1099 1.7 mrg <br><dt><code>--with-stage1-ldflags=</code><var>flags</var><dd>This option may be used to set linker flags to be used when linking
1100 1.1 mrg stage 1 of GCC. These are also used when linking GCC if configured with
1101 1.7 mrg <samp><span class="option">--disable-bootstrap</span></samp>. If <samp><span class="option">--with-stage1-libs</span></samp> is not set to a
1102 1.7 mrg value, then the default is ‘<samp><span class="samp">-static-libstdc++ -static-libgcc</span></samp>’, if
1103 1.7 mrg supported.
1104 1.7 mrg
1105 1.7 mrg <br><dt><code>--with-stage1-libs=</code><var>libs</var><dd>This option may be used to set libraries to be used when linking stage 1
1106 1.1 mrg of GCC. These are also used when linking GCC if configured with
1107 1.7 mrg <samp><span class="option">--disable-bootstrap</span></samp>.
1108 1.7 mrg
1109 1.7 mrg <br><dt><code>--with-boot-ldflags=</code><var>flags</var><dd>This option may be used to set linker flags to be used when linking
1110 1.7 mrg stage 2 and later when bootstrapping GCC. If –with-boot-libs
1111 1.7 mrg is not is set to a value, then the default is
1112 1.7 mrg ‘<samp><span class="samp">-static-libstdc++ -static-libgcc</span></samp>’.
1113 1.7 mrg
1114 1.7 mrg <br><dt><code>--with-boot-libs=</code><var>libs</var><dd>This option may be used to set libraries to be used when linking stage 2
1115 1.7 mrg and later when bootstrapping GCC.
1116 1.7 mrg
1117 1.7 mrg <br><dt><code>--with-debug-prefix-map=</code><var>map</var><dd>Convert source directory names using <samp><span class="option">-fdebug-prefix-map</span></samp> when
1118 1.1 mrg building runtime libraries. ‘<samp><var>map</var></samp>’ is a space-separated
1119 1.7 mrg list of maps of the form ‘<samp><var>old</var><span class="samp">=</span><var>new</var></samp>’.
1120 1.7 mrg
1121 1.7 mrg <br><dt><code>--enable-linker-build-id</code><dd>Tells GCC to pass <samp><span class="option">--build-id</span></samp> option to the linker for all final
1122 1.7 mrg links (links performed without the <samp><span class="option">-r</span></samp> or <samp><span class="option">--relocatable</span></samp>
1123 1.1 mrg option), if the linker supports it. If you specify
1124 1.7 mrg <samp><span class="option">--enable-linker-build-id</span></samp>, but your linker does not
1125 1.7 mrg support <samp><span class="option">--build-id</span></samp> option, a warning is issued and the
1126 1.7 mrg <samp><span class="option">--enable-linker-build-id</span></samp> option is ignored. The default is off.
1127 1.7 mrg
1128 1.7 mrg <br><dt><code>--with-linker-hash-style=</code><var>choice</var><dd>Tells GCC to pass <samp><span class="option">--hash-style=</span><var>choice</var></samp> option to the
1129 1.3 mrg linker for all final links. <var>choice</var> can be one of
1130 1.7 mrg ‘<samp><span class="samp">sysv</span></samp>’, ‘<samp><span class="samp">gnu</span></samp>’, and ‘<samp><span class="samp">both</span></samp>’ where ‘<samp><span class="samp">sysv</span></samp>’ is the default.
1131 1.7 mrg
1132 1.7 mrg <br><dt><code>--enable-gnu-unique-object</code><dt><code>--disable-gnu-unique-object</code><dd>Tells GCC to use the gnu_unique_object relocation for C++ template
1133 1.1 mrg static data members and inline function local statics. Enabled by
1134 1.5 mrg default for a toolchain with an assembler that accepts it and
1135 1.1 mrg GLIBC 2.11 or above, otherwise disabled.
1136 1.7 mrg
1137 1.7 mrg <br><dt><code>--with-diagnostics-color=</code><var>choice</var><dd>Tells GCC to use <var>choice</var> as the default for <samp><span class="option">-fdiagnostics-color=</span></samp>
1138 1.5 mrg option (if not used explicitly on the command line). <var>choice</var>
1139 1.7 mrg can be one of ‘<samp><span class="samp">never</span></samp>’, ‘<samp><span class="samp">auto</span></samp>’, ‘<samp><span class="samp">always</span></samp>’, and ‘<samp><span class="samp">auto-if-env</span></samp>’
1140 1.7 mrg where ‘<samp><span class="samp">auto</span></samp>’ is the default. ‘<samp><span class="samp">auto-if-env</span></samp>’ means that
1141 1.7 mrg <samp><span class="option">-fdiagnostics-color=auto</span></samp> will be the default if <code>GCC_COLORS</code>
1142 1.5 mrg is present and non-empty in the environment, and
1143 1.7 mrg <samp><span class="option">-fdiagnostics-color=never</span></samp> otherwise.
1144 1.7 mrg
1145 1.7 mrg <br><dt><code>--enable-lto</code><dt><code>--disable-lto</code><dd>Enable support for link-time optimization (LTO). This is enabled by
1146 1.7 mrg default, and may be disabled using <samp><span class="option">--disable-lto</span></samp>.
1147 1.7 mrg
1148 1.7 mrg <br><dt><code>--enable-linker-plugin-configure-flags=FLAGS</code><dt><code>--enable-linker-plugin-flags=FLAGS</code><dd>By default, linker plugins (such as the LTO plugin) are built for the
1149 1.5 mrg host system architecture. For the case that the linker has a
1150 1.5 mrg different (but run-time compatible) architecture, these flags can be
1151 1.5 mrg specified to build plugins that are compatible to the linker. For
1152 1.5 mrg example, if you are building GCC for a 64-bit x86_64
1153 1.7 mrg (‘<samp><span class="samp">x86_64-unknown-linux-gnu</span></samp>’) host system, but have a 32-bit x86
1154 1.7 mrg GNU/Linux (‘<samp><span class="samp">i686-pc-linux-gnu</span></samp>’) linker executable (which is
1155 1.5 mrg executable on the former system), you can configure GCC as follows for
1156 1.5 mrg getting compatible linker plugins:
1157 1.7 mrg
1158 1.7 mrg <pre class="smallexample"> % <var>srcdir</var>/configure \
1159 1.7 mrg --host=x86_64-unknown-linux-gnu \
1160 1.7 mrg --enable-linker-plugin-configure-flags=--host=i686-pc-linux-gnu \
1161 1.7 mrg --enable-linker-plugin-flags='CC=gcc\ -m32\ -Wl,-rpath,[...]/i686-pc-linux-gnu/lib'
1162 1.7 mrg </pre>
1163 1.7 mrg <br><dt><code>--with-plugin-ld=</code><var>pathname</var><dd>Enable an alternate linker to be used at link-time optimization (LTO)
1164 1.7 mrg link time when <samp><span class="option">-fuse-linker-plugin</span></samp> is enabled.
1165 1.3 mrg This linker should have plugin support such as gold starting with
1166 1.7 mrg version 2.20 or GNU ld starting with version 2.21.
1167 1.7 mrg See <samp><span class="option">-fuse-linker-plugin</span></samp> for details.
1168 1.7 mrg
1169 1.7 mrg <br><dt><code>--enable-canonical-system-headers</code><dt><code>--disable-canonical-system-headers</code><dd>Enable system header path canonicalization for <samp><span class="file">libcpp</span></samp>. This can
1170 1.3 mrg produce shorter header file paths in diagnostics and dependency output
1171 1.3 mrg files, but these changed header paths may conflict with some compilation
1172 1.3 mrg environments. Enabled by default, and may be disabled using
1173 1.7 mrg <samp><span class="option">--disable-canonical-system-headers</span></samp>.
1174 1.7 mrg
1175 1.7 mrg <br><dt><code>--with-glibc-version=</code><var>major</var><code>.</code><var>minor</var><dd>Tell GCC that when the GNU C Library (glibc) is used on the target it
1176 1.5 mrg will be version <var>major</var>.<var>minor</var> or later. Normally this can
1177 1.7 mrg be detected from the C library's header files, but this option may be
1178 1.5 mrg needed when bootstrapping a cross toolchain without the header files
1179 1.5 mrg available for building the initial bootstrap compiler.
1180 1.7 mrg
1181 1.7 mrg <p>If GCC is configured with some multilibs that use glibc and some that
1182 1.7 mrg do not, this option applies only to the multilibs that use glibc.
1183 1.5 mrg However, such configurations may not work well as not all the relevant
1184 1.5 mrg configuration in GCC is on a per-multilib basis.
1185 1.7 mrg
1186 1.7 mrg <br><dt><code>--enable-as-accelerator-for=</code><var>target</var><dd>Build as offload target compiler. Specify offload host triple by <var>target</var>.
1187 1.7 mrg
1188 1.7 mrg <br><dt><code>--enable-offload-targets=</code><var>target1</var><code>[=</code><var>path1</var><code>],...,</code><var>targetN</var><code>[=</code><var>pathN</var><code>]</code><dd>Enable offloading to targets <var>target1</var>, <small class="dots">...</small>, <var>targetN</var>.
1189 1.5 mrg Offload compilers are expected to be already installed. Default search
1190 1.5 mrg path for them is <samp><var>exec-prefix</var></samp>, but it can be changed by
1191 1.7 mrg specifying paths <var>path1</var>, <small class="dots">...</small>, <var>pathN</var>.
1192 1.7 mrg
1193 1.7 mrg <pre class="smallexample"> % <var>srcdir</var>/configure \
1194 1.7 mrg --enable-offload-target=i686-unknown-linux-gnu=/path/to/i686/compiler,x86_64-pc-linux-gnu
1195 1.7 mrg </pre>
1196 1.7 mrg <p>If ‘<samp><span class="samp">hsa</span></samp>’ is specified as one of the targets, the compiler will be
1197 1.7 mrg built with support for HSA GPU accelerators. Because the same
1198 1.7 mrg compiler will emit the accelerator code, no path should be specified.
1199 1.7 mrg
1200 1.7 mrg <br><dt><code>--with-hsa-runtime=</code><var>pathname</var><dt><code>--with-hsa-runtime-include=</code><var>pathname</var><dt><code>--with-hsa-runtime-lib=</code><var>pathname</var><dd>
1201 1.7 mrg If you configure GCC with HSA offloading but do not have the HSA
1202 1.7 mrg run-time library installed in a standard location then you can
1203 1.7 mrg explicitly specify the directory where they are installed. The
1204 1.7 mrg <samp><span class="option">--with-hsa-runtime=</span><var>hsainstalldir</var></samp> option is a
1205 1.7 mrg shorthand for
1206 1.7 mrg <samp><span class="option">--with-hsa-runtime-lib=</span><var>hsainstalldir</var><span class="option">/lib</span></samp> and
1207 1.7 mrg <samp><span class="option">--with-hsa-runtime-include=</span><var>hsainstalldir</var><span class="option">/include</span></samp>.
1208 1.7 mrg
1209 1.7 mrg <br><dt><code>--with-hsa-kmt-lib=</code><var>pathname</var><dd>
1210 1.7 mrg If you configure GCC with HSA offloading but do not have the HSA
1211 1.7 mrg KMT library installed in a standard location then you can
1212 1.7 mrg explicitly specify the directory where it resides.
1213 1.6 mrg </dl>
1214 1.1 mrg
1215 1.7 mrg <h4 class="subheading"><a name="TOC3"></a>Cross-Compiler-Specific Options</h4>
1216 1.7 mrg
1217 1.1 mrg <p>The following options only apply to building cross compilers.
1218 1.7 mrg
1219 1.7 mrg <dl>
1220 1.7 mrg <dt><code>--with-sysroot</code><dt><code>--with-sysroot=</code><var>dir</var><dd>Tells GCC to consider <var>dir</var> as the root of a tree that contains
1221 1.7 mrg (a subset of) the root filesystem of the target operating system.
1222 1.1 mrg Target system headers, libraries and run-time object files will be
1223 1.3 mrg searched for in there. More specifically, this acts as if
1224 1.7 mrg <samp><span class="option">--sysroot=</span><var>dir</var></samp> was added to the default options of the built
1225 1.1 mrg compiler. The specified directory is not copied into the
1226 1.7 mrg install tree, unlike the options <samp><span class="option">--with-headers</span></samp> and
1227 1.7 mrg <samp><span class="option">--with-libs</span></samp> that this option obsoletes. The default value,
1228 1.7 mrg in case <samp><span class="option">--with-sysroot</span></samp> is not given an argument, is
1229 1.7 mrg <samp><span class="option">${gcc_tooldir}/sys-root</span></samp>. If the specified directory is a
1230 1.7 mrg subdirectory of <samp><span class="option">${exec_prefix}</span></samp>, then it will be found relative to
1231 1.1 mrg the GCC binaries if the installation tree is moved.
1232 1.7 mrg
1233 1.7 mrg <p>This option affects the system root for the compiler used to build
1234 1.1 mrg target libraries (which runs on the build system) and the compiler newly
1235 1.1 mrg installed with <code>make install</code>; it does not affect the compiler which is
1236 1.1 mrg used to build GCC itself.
1237 1.7 mrg
1238 1.7 mrg <p>If you specify the <samp><span class="option">--with-native-system-header-dir=</span><var>dirname</var></samp>
1239 1.3 mrg option then the compiler will search that directory within <var>dirname</var> for
1240 1.7 mrg native system headers rather than the default <samp><span class="file">/usr/include</span></samp>.
1241 1.7 mrg
1242 1.7 mrg <br><dt><code>--with-build-sysroot</code><dt><code>--with-build-sysroot=</code><var>dir</var><dd>Tells GCC to consider <var>dir</var> as the system root (see
1243 1.7 mrg <samp><span class="option">--with-sysroot</span></samp>) while building target libraries, instead of
1244 1.7 mrg the directory specified with <samp><span class="option">--with-sysroot</span></samp>. This option is
1245 1.7 mrg only useful when you are already using <samp><span class="option">--with-sysroot</span></samp>. You
1246 1.7 mrg can use <samp><span class="option">--with-build-sysroot</span></samp> when you are configuring with
1247 1.7 mrg <samp><span class="option">--prefix</span></samp> set to a directory that is different from the one in
1248 1.1 mrg which you are installing GCC and your target libraries.
1249 1.7 mrg
1250 1.7 mrg <p>This option affects the system root for the compiler used to build
1251 1.1 mrg target libraries (which runs on the build system); it does not affect
1252 1.1 mrg the compiler which is used to build GCC itself.
1253 1.7 mrg
1254 1.7 mrg <p>If you specify the <samp><span class="option">--with-native-system-header-dir=</span><var>dirname</var></samp>
1255 1.3 mrg option then the compiler will search that directory within <var>dirname</var> for
1256 1.7 mrg native system headers rather than the default <samp><span class="file">/usr/include</span></samp>.
1257 1.7 mrg
1258 1.7 mrg <br><dt><code>--with-headers</code><dt><code>--with-headers=</code><var>dir</var><dd>Deprecated in favor of <samp><span class="option">--with-sysroot</span></samp>.
1259 1.7 mrg Specifies that target headers are available when building a cross compiler.
1260 1.1 mrg The <var>dir</var> argument specifies a directory which has the target include
1261 1.7 mrg files. These include files will be copied into the <samp><span class="file">gcc</span></samp> install
1262 1.7 mrg directory. <em>This option with the </em><var>dir</var><em> argument is required</em> when
1263 1.7 mrg building a cross compiler, if <samp><var>prefix</var><span class="file">/</span><var>target</var><span class="file">/sys-include</span></samp>
1264 1.7 mrg doesn't pre-exist. If <samp><var>prefix</var><span class="file">/</span><var>target</var><span class="file">/sys-include</span></samp> does
1265 1.7 mrg pre-exist, the <var>dir</var> argument may be omitted. <samp><span class="command">fixincludes</span></samp>
1266 1.1 mrg will be run on these files to make them compatible with GCC.
1267 1.7 mrg
1268 1.7 mrg <br><dt><code>--without-headers</code><dd>Tells GCC not use any target headers from a libc when building a cross
1269 1.1 mrg compiler. When crossing to GNU/Linux, you need the headers so GCC
1270 1.1 mrg can build the exception handling for libgcc.
1271 1.7 mrg
1272 1.7 mrg <br><dt><code>--with-libs</code><dt><code>--with-libs="</code><var>dir1</var> <var>dir2</var><code> ... </code><var>dirN</var><code>"</code><dd>Deprecated in favor of <samp><span class="option">--with-sysroot</span></samp>.
1273 1.1 mrg Specifies a list of directories which contain the target runtime
1274 1.7 mrg libraries. These libraries will be copied into the <samp><span class="file">gcc</span></samp> install
1275 1.1 mrg directory. If the directory list is omitted, this option has no
1276 1.1 mrg effect.
1277 1.7 mrg
1278 1.7 mrg <br><dt><code>--with-newlib</code><dd>Specifies that ‘<samp><span class="samp">newlib</span></samp>’ is
1279 1.1 mrg being used as the target C library. This causes <code>__eprintf</code> to be
1280 1.7 mrg omitted from <samp><span class="file">libgcc.a</span></samp> on the assumption that it will be provided by
1281 1.7 mrg ‘<samp><span class="samp">newlib</span></samp>’.
1282 1.7 mrg
1283 1.7 mrg <br><dt><code>--with-avrlibc</code><dd>Specifies that ‘<samp><span class="samp">AVR-Libc</span></samp>’ is
1284 1.3 mrg being used as the target C library. This causes float support
1285 1.7 mrg functions like <code>__addsf3</code> to be omitted from <samp><span class="file">libgcc.a</span></samp> on
1286 1.7 mrg the assumption that it will be provided by <samp><span class="file">libm.a</span></samp>. For more
1287 1.7 mrg technical details, cf. <a href="http://gcc.gnu.org/PR54461">PR54461</a>.
1288 1.3 mrg This option is only supported for the AVR target. It is not supported for
1289 1.3 mrg RTEMS configurations, which currently use newlib. The option is
1290 1.3 mrg supported since version 4.7.2 and is the default in 4.8.0 and newer.
1291 1.7 mrg
1292 1.7 mrg <br><dt><code>--with-nds32-lib=</code><var>library</var><dd>Specifies that <var>library</var> setting is used for building <samp><span class="file">libgcc.a</span></samp>.
1293 1.7 mrg Currently, the valid <var>library</var> is ‘<samp><span class="samp">newlib</span></samp>’ or ‘<samp><span class="samp">mculib</span></samp>’.
1294 1.5 mrg This option is only supported for the NDS32 target.
1295 1.7 mrg
1296 1.7 mrg <br><dt><code>--with-build-time-tools=</code><var>dir</var><dd>Specifies where to find the set of target tools (assembler, linker, etc.)
1297 1.1 mrg that will be used while building GCC itself. This option can be useful
1298 1.1 mrg if the directory layouts are different between the system you are building
1299 1.1 mrg GCC on, and the system where you will deploy it.
1300 1.7 mrg
1301 1.7 mrg <p>For example, on an ‘<samp><span class="samp">ia64-hp-hpux</span></samp>’ system, you may have the GNU
1302 1.7 mrg assembler and linker in <samp><span class="file">/usr/bin</span></samp>, and the native tools in a
1303 1.6 mrg different path, and build a toolchain that expects to find the
1304 1.7 mrg native tools in <samp><span class="file">/usr/bin</span></samp>.
1305 1.7 mrg
1306 1.7 mrg <p>When you use this option, you should ensure that <var>dir</var> includes
1307 1.7 mrg <samp><span class="command">ar</span></samp>, <samp><span class="command">as</span></samp>, <samp><span class="command">ld</span></samp>, <samp><span class="command">nm</span></samp>,
1308 1.7 mrg <samp><span class="command">ranlib</span></samp> and <samp><span class="command">strip</span></samp> if necessary, and possibly
1309 1.7 mrg <samp><span class="command">objdump</span></samp>. Otherwise, GCC may use an inconsistent set of
1310 1.7 mrg tools.
1311 1.6 mrg </dl>
1312 1.1 mrg
1313 1.7 mrg <h5 class="subsubheading"><a name="TOC4"></a>Overriding <samp><span class="command">configure</span></samp> test results</h5>
1314 1.1 mrg
1315 1.6 mrg <p>Sometimes, it might be necessary to override the result of some
1316 1.7 mrg <samp><span class="command">configure</span></samp> test, for example in order to ease porting to a new
1317 1.7 mrg system or work around a bug in a test. The toplevel <samp><span class="command">configure</span></samp>
1318 1.6 mrg script provides three variables for this:
1319 1.7 mrg
1320 1.7 mrg <dl>
1321 1.7 mrg <dt><code>build_configargs</code><dd><a name="index-g_t_0040code_007bbuild_005fconfigargs_007d-3"></a>The contents of this variable is passed to all build <samp><span class="command">configure</span></samp>
1322 1.6 mrg scripts.
1323 1.7 mrg
1324 1.7 mrg <br><dt><code>host_configargs</code><dd><a name="index-g_t_0040code_007bhost_005fconfigargs_007d-4"></a>The contents of this variable is passed to all host <samp><span class="command">configure</span></samp>
1325 1.6 mrg scripts.
1326 1.7 mrg
1327 1.7 mrg <br><dt><code>target_configargs</code><dd><a name="index-g_t_0040code_007btarget_005fconfigargs_007d-5"></a>The contents of this variable is passed to all target <samp><span class="command">configure</span></samp>
1328 1.6 mrg scripts.
1329 1.1 mrg
1330 1.7 mrg </dl>
1331 1.7 mrg
1332 1.7 mrg <p>In order to avoid shell and <samp><span class="command">make</span></samp> quoting issues for complex
1333 1.7 mrg overrides, you can pass a setting for <samp><span class="env">CONFIG_SITE</span></samp> and set
1334 1.6 mrg variables in the site file.
1335 1.7 mrg
1336 1.7 mrg <h4 class="subheading"><a name="TOC5"></a>Java-Specific Options</h4>
1337 1.1 mrg
1338 1.1 mrg <p>The following option applies to the build of the Java front end.
1339 1.7 mrg
1340 1.7 mrg <dl>
1341 1.7 mrg <dt><code>--disable-libgcj</code><dd>Specify that the run-time libraries
1342 1.1 mrg used by GCJ should not be built. This is useful in case you intend
1343 1.7 mrg to use GCJ with some other run-time, or you're going to install it
1344 1.1 mrg separately, or it just happens not to build on your particular
1345 1.1 mrg machine. In general, if the Java front end is enabled, the GCJ
1346 1.7 mrg libraries will be enabled too, unless they're known to not work on
1347 1.7 mrg the target platform. If GCJ is enabled but ‘<samp><span class="samp">libgcj</span></samp>’ isn't built, you
1348 1.1 mrg may need to port it; in this case, before modifying the top-level
1349 1.7 mrg <samp><span class="file">configure.ac</span></samp> so that ‘<samp><span class="samp">libgcj</span></samp>’ is enabled by default on this platform,
1350 1.7 mrg you may use <samp><span class="option">--enable-libgcj</span></samp> to override the default.
1351 1.7 mrg
1352 1.7 mrg </dl>
1353 1.7 mrg
1354 1.7 mrg <p>The following options apply to building ‘<samp><span class="samp">libgcj</span></samp>’.
1355 1.7 mrg
1356 1.7 mrg <h5 class="subsubheading"><a name="TOC6"></a>General Options</h5>
1357 1.1 mrg
1358 1.7 mrg <dl>
1359 1.7 mrg <dt><code>--enable-java-maintainer-mode</code><dd>By default the ‘<samp><span class="samp">libjava</span></samp>’ build will not attempt to compile the
1360 1.7 mrg <samp><span class="file">.java</span></samp> source files to <samp><span class="file">.class</span></samp>. Instead, it will use the
1361 1.7 mrg <samp><span class="file">.class</span></samp> files from the source tree. If you use this option you
1362 1.7 mrg must have executables named <samp><span class="command">ecj1</span></samp> and <samp><span class="command">gjavah</span></samp> in your path
1363 1.1 mrg for use by the build. You must use this option if you intend to
1364 1.7 mrg modify any <samp><span class="file">.java</span></samp> files in <samp><span class="file">libjava</span></samp>.
1365 1.7 mrg
1366 1.7 mrg <br><dt><code>--with-java-home=</code><var>dirname</var><dd>This ‘<samp><span class="samp">libjava</span></samp>’ option overrides the default value of the
1367 1.7 mrg ‘<samp><span class="samp">java.home</span></samp>’ system property. It is also used to set
1368 1.7 mrg ‘<samp><span class="samp">sun.boot.class.path</span></samp>’ to <samp><var>dirname</var><span class="file">/lib/rt.jar</span></samp>. By
1369 1.7 mrg default ‘<samp><span class="samp">java.home</span></samp>’ is set to <samp><var>prefix</var></samp> and
1370 1.7 mrg ‘<samp><span class="samp">sun.boot.class.path</span></samp>’ to
1371 1.7 mrg <samp><var>datadir</var><span class="file">/java/libgcj-</span><var>version</var><span class="file">.jar</span></samp>.
1372 1.7 mrg
1373 1.7 mrg <br><dt><code>--with-ecj-jar=</code><var>filename</var><dd>This option can be used to specify the location of an external jar
1374 1.1 mrg file containing the Eclipse Java compiler. A specially modified
1375 1.7 mrg version of this compiler is used by <samp><span class="command">gcj</span></samp> to parse
1376 1.7 mrg <samp><span class="file">.java</span></samp> source files. If this option is given, the
1377 1.7 mrg ‘<samp><span class="samp">libjava</span></samp>’ build will create and install an <samp><span class="file">ecj1</span></samp> executable
1378 1.1 mrg which uses this jar file at runtime.
1379 1.7 mrg
1380 1.7 mrg <p>If this option is not given, but an <samp><span class="file">ecj.jar</span></samp> file is found in
1381 1.7 mrg the topmost source tree at configure time, then the ‘<samp><span class="samp">libgcj</span></samp>’
1382 1.7 mrg build will create and install <samp><span class="file">ecj1</span></samp>, and will also install the
1383 1.7 mrg discovered <samp><span class="file">ecj.jar</span></samp> into a suitable place in the install tree.
1384 1.7 mrg
1385 1.7 mrg <p>If <samp><span class="file">ecj1</span></samp> is not installed, then the user will have to supply one
1386 1.7 mrg on his path in order for <samp><span class="command">gcj</span></samp> to properly parse <samp><span class="file">.java</span></samp>
1387 1.1 mrg source files. A suitable jar is available from
1388 1.1 mrg <a href="ftp://sourceware.org/pub/java/">ftp://sourceware.org/pub/java/</a>.
1389 1.7 mrg
1390 1.7 mrg <br><dt><code>--disable-getenv-properties</code><dd>Don't set system properties from <samp><span class="env">GCJ_PROPERTIES</span></samp>.
1391 1.7 mrg
1392 1.7 mrg <br><dt><code>--enable-hash-synchronization</code><dd>Use a global hash table for monitor locks. Ordinarily,
1393 1.7 mrg ‘<samp><span class="samp">libgcj</span></samp>’'s ‘<samp><span class="samp">configure</span></samp>’ script automatically makes
1394 1.1 mrg the correct choice for this option for your platform. Only use
1395 1.1 mrg this if you know you need the library to be configured differently.
1396 1.7 mrg
1397 1.7 mrg <br><dt><code>--enable-interpreter</code><dd>Enable the Java interpreter. The interpreter is automatically
1398 1.1 mrg enabled by default on all platforms that support it. This option
1399 1.1 mrg is really only useful if you want to disable the interpreter
1400 1.7 mrg (using <samp><span class="option">--disable-interpreter</span></samp>).
1401 1.7 mrg
1402 1.7 mrg <br><dt><code>--disable-java-net</code><dd>Disable java.net. This disables the native part of java.net only,
1403 1.1 mrg using non-functional stubs for native method implementations.
1404 1.7 mrg
1405 1.7 mrg <br><dt><code>--disable-jvmpi</code><dd>Disable JVMPI support.
1406 1.7 mrg
1407 1.7 mrg <br><dt><code>--disable-libgcj-bc</code><dd>Disable BC ABI compilation of certain parts of libgcj. By default,
1408 1.7 mrg some portions of libgcj are compiled with <samp><span class="option">-findirect-dispatch</span></samp>
1409 1.7 mrg and <samp><span class="option">-fno-indirect-classes</span></samp>, allowing them to be overridden at
1410 1.1 mrg run-time.
1411 1.7 mrg
1412 1.7 mrg <p>If <samp><span class="option">--disable-libgcj-bc</span></samp> is specified, libgcj is built without
1413 1.1 mrg these options. This allows the compile-time linker to resolve
1414 1.1 mrg dependencies when statically linking to libgcj. However it makes it
1415 1.1 mrg impossible to override the affected portions of libgcj at run-time.
1416 1.7 mrg
1417 1.7 mrg <br><dt><code>--enable-reduced-reflection</code><dd>Build most of libgcj with <samp><span class="option">-freduced-reflection</span></samp>. This reduces
1418 1.1 mrg the size of libgcj at the expense of not being able to do accurate
1419 1.1 mrg reflection on the classes it contains. This option is safe if you
1420 1.1 mrg know that code using libgcj will never use reflection on the standard
1421 1.1 mrg runtime classes in libgcj (including using serialization, RMI or CORBA).
1422 1.7 mrg
1423 1.7 mrg <br><dt><code>--with-ecos</code><dd>Enable runtime eCos target support.
1424 1.7 mrg
1425 1.7 mrg <br><dt><code>--without-libffi</code><dd>Don't use ‘<samp><span class="samp">libffi</span></samp>’. This will disable the interpreter and JNI
1426 1.7 mrg support as well, as these require ‘<samp><span class="samp">libffi</span></samp>’ to work.
1427 1.7 mrg
1428 1.7 mrg <br><dt><code>--enable-libgcj-debug</code><dd>Enable runtime debugging code.
1429 1.7 mrg
1430 1.7 mrg <br><dt><code>--enable-libgcj-multifile</code><dd>If specified, causes all <samp><span class="file">.java</span></samp> source files to be
1431 1.7 mrg compiled into <samp><span class="file">.class</span></samp> files in one invocation of
1432 1.7 mrg ‘<samp><span class="samp">gcj</span></samp>’. This can speed up build time, but is more
1433 1.1 mrg resource-intensive. If this option is unspecified or
1434 1.7 mrg disabled, ‘<samp><span class="samp">gcj</span></samp>’ is invoked once for each <samp><span class="file">.java</span></samp>
1435 1.7 mrg file to compile into a <samp><span class="file">.class</span></samp> file.
1436 1.7 mrg
1437 1.7 mrg <br><dt><code>--with-libiconv-prefix=DIR</code><dd>Search for libiconv in <samp><span class="file">DIR/include</span></samp> and <samp><span class="file">DIR/lib</span></samp>.
1438 1.7 mrg
1439 1.7 mrg <br><dt><code>--with-system-zlib</code><dd>Use installed ‘<samp><span class="samp">zlib</span></samp>’ rather than that included with GCC.
1440 1.7 mrg
1441 1.7 mrg <br><dt><code>--with-win32-nlsapi=ansi, unicows or unicode</code><dd>Indicates how MinGW ‘<samp><span class="samp">libgcj</span></samp>’ translates between UNICODE
1442 1.1 mrg characters and the Win32 API.
1443 1.7 mrg
1444 1.7 mrg <br><dt><code>--enable-java-home</code><dd>If enabled, this creates a JPackage compatible SDK environment during install.
1445 1.1 mrg Note that if –enable-java-home is used, –with-arch-directory=ARCH must also
1446 1.1 mrg be specified.
1447 1.7 mrg
1448 1.7 mrg <br><dt><code>--with-arch-directory=ARCH</code><dd>Specifies the name to use for the <samp><span class="file">jre/lib/ARCH</span></samp> directory in the SDK
1449 1.1 mrg environment created when –enable-java-home is passed. Typical names for this
1450 1.1 mrg directory include i386, amd64, ia64, etc.
1451 1.7 mrg
1452 1.7 mrg <br><dt><code>--with-os-directory=DIR</code><dd>Specifies the OS directory for the SDK include directory. This is set to auto
1453 1.7 mrg detect, and is typically 'linux'.
1454 1.7 mrg
1455 1.7 mrg <br><dt><code>--with-origin-name=NAME</code><dd>Specifies the JPackage origin name. This defaults to the 'gcj' in
1456 1.1 mrg java-1.5.0-gcj.
1457 1.7 mrg
1458 1.7 mrg <br><dt><code>--with-arch-suffix=SUFFIX</code><dd>Specifies the suffix for the sdk directory. Defaults to the empty string.
1459 1.7 mrg Examples include '.x86_64' in 'java-1.5.0-gcj-1.5.0.0.x86_64'.
1460 1.7 mrg
1461 1.7 mrg <br><dt><code>--with-jvm-root-dir=DIR</code><dd>Specifies where to install the SDK. Default is $(prefix)/lib/jvm.
1462 1.7 mrg
1463 1.7 mrg <br><dt><code>--with-jvm-jar-dir=DIR</code><dd>Specifies where to install jars. Default is $(prefix)/lib/jvm-exports.
1464 1.7 mrg
1465 1.7 mrg <br><dt><code>--with-python-dir=DIR</code><dd>Specifies where to install the Python modules used for aot-compile. DIR should
1466 1.1 mrg not include the prefix used in installation. For example, if the Python modules
1467 1.1 mrg are to be installed in /usr/lib/python2.5/site-packages, then
1468 1.1 mrg –with-python-dir=/lib/python2.5/site-packages should be passed. If this is
1469 1.1 mrg not specified, then the Python modules are installed in $(prefix)/share/python.
1470 1.7 mrg
1471 1.7 mrg <br><dt><code>--enable-aot-compile-rpm</code><dd>Adds aot-compile-rpm to the list of installed scripts.
1472 1.7 mrg
1473 1.7 mrg <br><dt><code>--enable-browser-plugin</code><dd>Build the gcjwebplugin web browser plugin.
1474 1.7 mrg
1475 1.7 mrg <br><dt><code>--enable-static-libjava</code><dd>Build static libraries in libjava. The default is to only build shared
1476 1.3 mrg libraries.
1477 1.7 mrg
1478 1.7 mrg <dl>
1479 1.7 mrg <dt><code>ansi</code><dd>Use the single-byte <code>char</code> and the Win32 A functions natively,
1480 1.1 mrg translating to and from UNICODE when using these functions. If
1481 1.1 mrg unspecified, this is the default.
1482 1.7 mrg
1483 1.7 mrg <br><dt><code>unicows</code><dd>Use the <code>WCHAR</code> and Win32 W functions natively. Adds
1484 1.7 mrg <code>-lunicows</code> to <samp><span class="file">libgcj.spec</span></samp> to link with ‘<samp><span class="samp">libunicows</span></samp>’.
1485 1.7 mrg <samp><span class="file">unicows.dll</span></samp> needs to be deployed on Microsoft Windows 9X machines
1486 1.7 mrg running built executables. <samp><span class="file">libunicows.a</span></samp>, an open-source
1487 1.7 mrg import library around Microsoft's <code>unicows.dll</code>, is obtained from
1488 1.1 mrg <a href="http://libunicows.sourceforge.net/">http://libunicows.sourceforge.net/</a>, which also gives details
1489 1.7 mrg on getting <samp><span class="file">unicows.dll</span></samp> from Microsoft.
1490 1.7 mrg
1491 1.7 mrg <br><dt><code>unicode</code><dd>Use the <code>WCHAR</code> and Win32 W functions natively. Does <em>not</em>
1492 1.7 mrg add <code>-lunicows</code> to <samp><span class="file">libgcj.spec</span></samp>. The built executables will
1493 1.7 mrg only run on Microsoft Windows NT and above.
1494 1.6 mrg </dl>
1495 1.7 mrg </dl>
1496 1.1 mrg
1497 1.7 mrg <h5 class="subsubheading"><a name="TOC7"></a>AWT-Specific Options</h5>
1498 1.1 mrg
1499 1.7 mrg <dl>
1500 1.7 mrg <dt><code>--with-x</code><dd>Use the X Window System.
1501 1.1 mrg
1502 1.7 mrg <br><dt><code>--enable-java-awt=PEER(S)</code><dd>Specifies the AWT peer library or libraries to build alongside
1503 1.7 mrg ‘<samp><span class="samp">libgcj</span></samp>’. If this option is unspecified or disabled, AWT
1504 1.7 mrg will be non-functional. Current valid values are <samp><span class="option">gtk</span></samp> and
1505 1.7 mrg <samp><span class="option">xlib</span></samp>. Multiple libraries should be separated by a
1506 1.7 mrg comma (i.e. <samp><span class="option">--enable-java-awt=gtk,xlib</span></samp>).
1507 1.1 mrg
1508 1.7 mrg <br><dt><code>--enable-gtk-cairo</code><dd>Build the cairo Graphics2D implementation on GTK.
1509 1.1 mrg
1510 1.7 mrg <br><dt><code>--enable-java-gc=TYPE</code><dd>Choose garbage collector. Defaults to <samp><span class="option">boehm</span></samp> if unspecified.
1511 1.1 mrg
1512 1.7 mrg <br><dt><code>--disable-gtktest</code><dd>Do not try to compile and run a test GTK+ program.
1513 1.3 mrg
1514 1.7 mrg <br><dt><code>--disable-glibtest</code><dd>Do not try to compile and run a test GLIB program.
1515 1.3 mrg
1516 1.7 mrg <br><dt><code>--with-libart-prefix=PFX</code><dd>Prefix where libart is installed (optional).
1517 1.3 mrg
1518 1.7 mrg <br><dt><code>--with-libart-exec-prefix=PFX</code><dd>Exec prefix where libart is installed (optional).
1519 1.3 mrg
1520 1.7 mrg <br><dt><code>--disable-libarttest</code><dd>Do not try to compile and run a test libart program.
1521 1.3 mrg
1522 1.7 mrg </dl>
1523 1.3 mrg
1524 1.7 mrg <p><hr />
1525 1.7 mrg <p><a href="./index.html">Return to the GCC Installation page</a>
1526 1.1 mrg
1527 1.7 mrg <!-- ***Building**************************************************************** -->
1528 1.7 mrg <!-- ***Testing***************************************************************** -->
1529 1.7 mrg <!-- ***Final install*********************************************************** -->
1530 1.7 mrg <!-- ***Binaries**************************************************************** -->
1531 1.7 mrg <!-- ***Specific**************************************************************** -->
1532 1.7 mrg <!-- ***Old documentation****************************************************** -->
1533 1.7 mrg <!-- ***GFDL******************************************************************** -->
1534 1.7 mrg <!-- *************************************************************************** -->
1535 1.7 mrg <!-- Part 6 The End of the Document -->
1536 1.7 mrg </body></html>
1537 1.1 mrg
1538