configure.html revision 1.1.1.1.2.1
1 1.1 mrg <html lang="en"> 2 1.1 mrg <head> 3 1.1 mrg <title>Installing GCC: Configuration</title> 4 1.1 mrg <meta http-equiv="Content-Type" content="text/html"> 5 1.1 mrg <meta name="description" content="Installing GCC: Configuration"> 6 1.1 mrg <meta name="generator" content="makeinfo 4.12"> 7 1.1 mrg <link title="Top" rel="top" href="#Top"> 8 1.1 mrg <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> 9 1.1 mrg <!-- 10 1.1 mrg Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 11 1.1 mrg 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 12 1.1 mrg 2009, 2010, 2011 Free Software Foundation, Inc. 13 1.1 mrg 14 1.1 mrg Permission is granted to copy, distribute and/or modify this document 15 1.1 mrg under the terms of the GNU Free Documentation License, Version 1.2 or 16 1.1 mrg any later version published by the Free Software Foundation; with no 17 1.1 mrg Invariant Sections, the Front-Cover texts being (a) (see below), and 18 1.1 mrg with the Back-Cover Texts being (b) (see below). A copy of the 19 1.1 mrg license is included in the section entitled "GNU Free Documentation License". 20 1.1 mrg 21 1.1 mrg (a) The FSF's Front-Cover Text is: 22 1.1 mrg 23 1.1 mrg A GNU Manual 24 1.1 mrg 25 1.1 mrg (b) The FSF's Back-Cover Text is: 26 1.1 mrg 27 1.1 mrg You have freedom to copy and modify this GNU Manual, like GNU 28 1.1 mrg software. Copies published by the Free Software Foundation raise 29 1.1 mrg funds for GNU development.--> 30 1.1 mrg <meta http-equiv="Content-Style-Type" content="text/css"> 31 1.1 mrg <style type="text/css"><!-- 32 1.1 mrg pre.display { font-family:inherit } 33 1.1 mrg pre.format { font-family:inherit } 34 1.1 mrg pre.smalldisplay { font-family:inherit; font-size:smaller } 35 1.1 mrg pre.smallformat { font-family:inherit; font-size:smaller } 36 1.1 mrg pre.smallexample { font-size:smaller } 37 1.1 mrg pre.smalllisp { font-size:smaller } 38 1.1 mrg span.sc { font-variant:small-caps } 39 1.1 mrg span.roman { font-family:serif; font-weight:normal; } 40 1.1 mrg span.sansserif { font-family:sans-serif; font-weight:normal; } 41 1.1 mrg --></style> 42 1.1 mrg </head> 43 1.1 mrg <body> 44 1.1 mrg <h1 class="settitle">Installing GCC: Configuration</h1> 45 1.1 mrg <a name="index-Configuration-1"></a><a name="index-Installing-GCC_003a-Configuration-2"></a> 46 1.1 mrg Like most GNU software, GCC must be configured before it can be built. 47 1.1 mrg This document describes the recommended configuration procedure 48 1.1 mrg for both native and cross targets. 49 1.1 mrg 50 1.1 mrg <p>We use <var>srcdir</var> to refer to the toplevel source directory for 51 1.1 mrg GCC; we use <var>objdir</var> to refer to the toplevel build/object directory. 52 1.1 mrg 53 1.1 mrg <p>If you obtained the sources via SVN, <var>srcdir</var> must refer to the top 54 1.1 mrg <samp><span class="file">gcc</span></samp> directory, the one where the <samp><span class="file">MAINTAINERS</span></samp> file can be 55 1.1 mrg found, and not its <samp><span class="file">gcc</span></samp> subdirectory, otherwise the build will fail. 56 1.1 mrg 57 1.1 mrg <p>If either <var>srcdir</var> or <var>objdir</var> is located on an automounted NFS 58 1.1 mrg file system, the shell's built-in <samp><span class="command">pwd</span></samp> command will return 59 1.1 mrg temporary pathnames. Using these can lead to various sorts of build 60 1.1 mrg problems. To avoid this issue, set the <samp><span class="env">PWDCMD</span></samp> environment 61 1.1 mrg variable to an automounter-aware <samp><span class="command">pwd</span></samp> command, e.g., 62 1.1 mrg <samp><span class="command">pawd</span></samp> or ‘<samp><span class="samp">amq -w</span></samp>’, during the configuration and build 63 1.1 mrg phases. 64 1.1 mrg 65 1.1 mrg <p>First, we <strong>highly</strong> recommend that GCC be built into a 66 1.1 mrg separate directory from the sources which does <strong>not</strong> reside 67 1.1 mrg within the source tree. This is how we generally build GCC; building 68 1.1 mrg where <var>srcdir</var> == <var>objdir</var> should still work, but doesn't 69 1.1 mrg get extensive testing; building where <var>objdir</var> is a subdirectory 70 1.1 mrg of <var>srcdir</var> is unsupported. 71 1.1 mrg 72 1.1 mrg <p>If you have previously built GCC in the same directory for a 73 1.1 mrg different target machine, do ‘<samp><span class="samp">make distclean</span></samp>’ to delete all files 74 1.1 mrg that might be invalid. One of the files this deletes is <samp><span class="file">Makefile</span></samp>; 75 1.1 mrg if ‘<samp><span class="samp">make distclean</span></samp>’ complains that <samp><span class="file">Makefile</span></samp> does not exist 76 1.1 mrg or issues a message like “don't know how to make distclean” it probably 77 1.1 mrg means that the directory is already suitably clean. However, with the 78 1.1 mrg recommended method of building in a separate <var>objdir</var>, you should 79 1.1 mrg simply use a different <var>objdir</var> for each target. 80 1.1 mrg 81 1.1 mrg <p>Second, when configuring a native system, either <samp><span class="command">cc</span></samp> or 82 1.1 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 83 1.1 mrg your environment before running configure. Otherwise the configuration 84 1.1 mrg scripts may fail. 85 1.1 mrg 86 1.1 mrg <p>To configure GCC: 87 1.1 mrg 88 1.1 mrg <pre class="smallexample"> % mkdir <var>objdir</var> 89 1.1 mrg % cd <var>objdir</var> 90 1.1 mrg % <var>srcdir</var>/configure [<var>options</var>] [<var>target</var>] 91 1.1 mrg </pre> 92 1.1 mrg <h3 class="heading"><a name="TOC0"></a>Distributor options</h3> 93 1.1 mrg 94 1.1 mrg <p>If you will be distributing binary versions of GCC, with modifications 95 1.1 mrg to the source code, you should use the options described in this 96 1.1 mrg section to make clear that your version contains modifications. 97 1.1 mrg 98 1.1 mrg <dl> 99 1.1 mrg <dt><code>--with-pkgversion=</code><var>version</var><dd>Specify a string that identifies your package. You may wish 100 1.1 mrg to include a build number or build date. This version string will be 101 1.1 mrg included in the output of <samp><span class="command">gcc --version</span></samp>. This suffix does 102 1.1 mrg not replace the default version string, only the ‘<samp><span class="samp">GCC</span></samp>’ part. 103 1.1 mrg 104 1.1 mrg <p>The default value is ‘<samp><span class="samp">GCC</span></samp>’. 105 1.1 mrg 106 1.1 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. 107 1.1 mrg You are of course welcome to forward bugs reported to you to the FSF, 108 1.1 mrg if you determine that they are not bugs in your modifications. 109 1.1 mrg 110 1.1 mrg <p>The default value refers to the FSF's GCC bug tracker. 111 1.1 mrg 112 1.1 mrg </dl> 113 1.1 mrg 114 1.1 mrg <h3 class="heading"><a name="TOC1"></a>Target specification</h3> 115 1.1 mrg 116 1.1 mrg <ul> 117 1.1 mrg <li>GCC has code to correctly determine the correct value for <var>target</var> 118 1.1 mrg for nearly all native systems. Therefore, we highly recommend you do 119 1.1 mrg not provide a configure target when configuring a native compiler. 120 1.1 mrg 121 1.1 mrg <li><var>target</var> must be specified as <samp><span class="option">--target=</span><var>target</var></samp> 122 1.1 mrg when configuring a cross compiler; examples of valid targets would be 123 1.1 mrg m68k-elf, sh-elf, etc. 124 1.1 mrg 125 1.1 mrg <li>Specifying just <var>target</var> instead of <samp><span class="option">--target=</span><var>target</var></samp> 126 1.1 mrg implies that the host defaults to <var>target</var>. 127 1.1 mrg </ul> 128 1.1 mrg 129 1.1 mrg <h3 class="heading"><a name="TOC2"></a>Options specification</h3> 130 1.1 mrg 131 1.1 mrg <p>Use <var>options</var> to override several configure time options for 132 1.1 mrg GCC. A list of supported <var>options</var> follows; ‘<samp><span class="samp">configure 133 1.1 mrg --help</span></samp>’ may list other options, but those not listed below may not 134 1.1 mrg work and should not normally be used. 135 1.1 mrg 136 1.1 mrg <p>Note that each <samp><span class="option">--enable</span></samp> option has a corresponding 137 1.1 mrg <samp><span class="option">--disable</span></samp> option and that each <samp><span class="option">--with</span></samp> option has a 138 1.1 mrg corresponding <samp><span class="option">--without</span></samp> option. 139 1.1 mrg 140 1.1 mrg <dl> 141 1.1 mrg <dt><code>--prefix=</code><var>dirname</var><dd>Specify the toplevel installation 142 1.1 mrg directory. This is the recommended way to install the tools into a directory 143 1.1 mrg other than the default. The toplevel installation directory defaults to 144 1.1 mrg <samp><span class="file">/usr/local</span></samp>. 145 1.1 mrg 146 1.1 mrg <p>We <strong>highly</strong> recommend against <var>dirname</var> being the same or a 147 1.1 mrg subdirectory of <var>objdir</var> or vice versa. If specifying a directory 148 1.1 mrg beneath a user's home directory tree, some shells will not expand 149 1.1 mrg <var>dirname</var> correctly if it contains the ‘<samp><span class="samp">~</span></samp>’ metacharacter; use 150 1.1 mrg <samp><span class="env">$HOME</span></samp> instead. 151 1.1 mrg 152 1.1 mrg <p>The following standard <samp><span class="command">autoconf</span></samp> options are supported. Normally you 153 1.1 mrg should not need to use these options. 154 1.1 mrg <dl> 155 1.1 mrg <dt><code>--exec-prefix=</code><var>dirname</var><dd>Specify the toplevel installation directory for architecture-dependent 156 1.1 mrg files. The default is <samp><var>prefix</var></samp>. 157 1.1 mrg 158 1.1 mrg <br><dt><code>--bindir=</code><var>dirname</var><dd>Specify the installation directory for the executables called by users 159 1.1 mrg (such as <samp><span class="command">gcc</span></samp> and <samp><span class="command">g++</span></samp>). The default is 160 1.1 mrg <samp><var>exec-prefix</var><span class="file">/bin</span></samp>. 161 1.1 mrg 162 1.1 mrg <br><dt><code>--libdir=</code><var>dirname</var><dd>Specify the installation directory for object code libraries and 163 1.1 mrg internal data files of GCC. The default is <samp><var>exec-prefix</var><span class="file">/lib</span></samp>. 164 1.1 mrg 165 1.1 mrg <br><dt><code>--libexecdir=</code><var>dirname</var><dd>Specify the installation directory for internal executables of GCC. 166 1.1 mrg The default is <samp><var>exec-prefix</var><span class="file">/libexec</span></samp>. 167 1.1 mrg 168 1.1 mrg <br><dt><code>--with-slibdir=</code><var>dirname</var><dd>Specify the installation directory for the shared libgcc library. The 169 1.1 mrg default is <samp><var>libdir</var></samp>. 170 1.1 mrg 171 1.1 mrg <br><dt><code>--datarootdir=</code><var>dirname</var><dd>Specify the root of the directory tree for read-only architecture-independent 172 1.1 mrg data files referenced by GCC. The default is <samp><var>prefix</var><span class="file">/share</span></samp>. 173 1.1 mrg 174 1.1 mrg <br><dt><code>--infodir=</code><var>dirname</var><dd>Specify the installation directory for documentation in info format. 175 1.1 mrg The default is <samp><var>datarootdir</var><span class="file">/info</span></samp>. 176 1.1 mrg 177 1.1 mrg <br><dt><code>--datadir=</code><var>dirname</var><dd>Specify the installation directory for some architecture-independent 178 1.1 mrg data files referenced by GCC. The default is <samp><var>datarootdir</var></samp>. 179 1.1 mrg 180 1.1 mrg <br><dt><code>--docdir=</code><var>dirname</var><dd>Specify the installation directory for documentation files (other 181 1.1 mrg than Info) for GCC. The default is <samp><var>datarootdir</var><span class="file">/doc</span></samp>. 182 1.1 mrg 183 1.1 mrg <br><dt><code>--htmldir=</code><var>dirname</var><dd>Specify the installation directory for HTML documentation files. 184 1.1 mrg The default is <samp><var>docdir</var></samp>. 185 1.1 mrg 186 1.1 mrg <br><dt><code>--pdfdir=</code><var>dirname</var><dd>Specify the installation directory for PDF documentation files. 187 1.1 mrg The default is <samp><var>docdir</var></samp>. 188 1.1 mrg 189 1.1 mrg <br><dt><code>--mandir=</code><var>dirname</var><dd>Specify the installation directory for manual pages. The default is 190 1.1 mrg <samp><var>datarootdir</var><span class="file">/man</span></samp>. (Note that the manual pages are only extracts 191 1.1 mrg from the full GCC manuals, which are provided in Texinfo format. The manpages 192 1.1 mrg are derived by an automatic conversion process from parts of the full 193 1.1 mrg manual.) 194 1.1 mrg 195 1.1 mrg <br><dt><code>--with-gxx-include-dir=</code><var>dirname</var><dd>Specify 196 1.1 mrg the installation directory for G++ header files. The default depends 197 1.1 mrg on other configuration options, and differs between cross and native 198 1.1 mrg configurations. 199 1.1 mrg 200 1.1 mrg </dl> 201 1.1 mrg 202 1.1 mrg <br><dt><code>--program-prefix=</code><var>prefix</var><dd>GCC supports some transformations of the names of its programs when 203 1.1 mrg installing them. This option prepends <var>prefix</var> to the names of 204 1.1 mrg programs to install in <var>bindir</var> (see above). For example, specifying 205 1.1 mrg <samp><span class="option">--program-prefix=foo-</span></samp> would result in ‘<samp><span class="samp">gcc</span></samp>’ 206 1.1 mrg being installed as <samp><span class="file">/usr/local/bin/foo-gcc</span></samp>. 207 1.1 mrg 208 1.1 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> 209 1.1 mrg (see above). For example, specifying <samp><span class="option">--program-suffix=-3.1</span></samp> 210 1.1 mrg would result in ‘<samp><span class="samp">gcc</span></samp>’ being installed as 211 1.1 mrg <samp><span class="file">/usr/local/bin/gcc-3.1</span></samp>. 212 1.1 mrg 213 1.1 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 214 1.1 mrg of programs to install in <var>bindir</var> (see above). <var>pattern</var> has to 215 1.1 mrg consist of one or more basic ‘<samp><span class="samp">sed</span></samp>’ editing commands, separated by 216 1.1 mrg semicolons. For example, if you want the ‘<samp><span class="samp">gcc</span></samp>’ program name to be 217 1.1 mrg transformed to the installed program <samp><span class="file">/usr/local/bin/myowngcc</span></samp> and 218 1.1 mrg the ‘<samp><span class="samp">g++</span></samp>’ program name to be transformed to 219 1.1 mrg <samp><span class="file">/usr/local/bin/gspecial++</span></samp> without changing other program names, 220 1.1 mrg you could use the pattern 221 1.1 mrg <samp><span class="option">--program-transform-name='s/^gcc$/myowngcc/; s/^g++$/gspecial++/'</span></samp> 222 1.1 mrg to achieve this effect. 223 1.1 mrg 224 1.1 mrg <p>All three options can be combined and used together, resulting in more 225 1.1 mrg complex conversion patterns. As a basic rule, <var>prefix</var> (and 226 1.1 mrg <var>suffix</var>) are prepended (appended) before further transformations 227 1.1 mrg can happen with a special transformation script <var>pattern</var>. 228 1.1 mrg 229 1.1 mrg <p>As currently implemented, this option only takes effect for native 230 1.1 mrg builds; cross compiler binaries' names are not transformed even when a 231 1.1 mrg transformation is explicitly asked for by one of these options. 232 1.1 mrg 233 1.1 mrg <p>For native builds, some of the installed programs are also installed 234 1.1 mrg with the target alias in front of their name, as in 235 1.1 mrg ‘<samp><span class="samp">i686-pc-linux-gnu-gcc</span></samp>’. All of the above transformations happen 236 1.1 mrg before the target alias is prepended to the name—so, specifying 237 1.1 mrg <samp><span class="option">--program-prefix=foo-</span></samp> and <samp><span class="option">program-suffix=-3.1</span></samp>, the 238 1.1 mrg resulting binary would be installed as 239 1.1 mrg <samp><span class="file">/usr/local/bin/i686-pc-linux-gnu-foo-gcc-3.1</span></samp>. 240 1.1 mrg 241 1.1 mrg <p>As a last shortcoming, none of the installed Ada programs are 242 1.1 mrg transformed yet, which will be fixed in some time. 243 1.1 mrg 244 1.1 mrg <br><dt><code>--with-local-prefix=</code><var>dirname</var><dd>Specify the 245 1.1 mrg installation directory for local include files. The default is 246 1.1 mrg <samp><span class="file">/usr/local</span></samp>. Specify this option if you want the compiler to 247 1.1 mrg search directory <samp><var>dirname</var><span class="file">/include</span></samp> for locally installed 248 1.1 mrg header files <em>instead</em> of <samp><span class="file">/usr/local/include</span></samp>. 249 1.1 mrg 250 1.1 mrg <p>You should specify <samp><span class="option">--with-local-prefix</span></samp> <strong>only</strong> if your 251 1.1 mrg site has a different convention (not <samp><span class="file">/usr/local</span></samp>) for where to put 252 1.1 mrg site-specific files. 253 1.1 mrg 254 1.1 mrg <p>The default value for <samp><span class="option">--with-local-prefix</span></samp> is <samp><span class="file">/usr/local</span></samp> 255 1.1 mrg regardless of the value of <samp><span class="option">--prefix</span></samp>. Specifying 256 1.1 mrg <samp><span class="option">--prefix</span></samp> has no effect on which directory GCC searches for 257 1.1 mrg local header files. This may seem counterintuitive, but actually it is 258 1.1 mrg logical. 259 1.1 mrg 260 1.1 mrg <p>The purpose of <samp><span class="option">--prefix</span></samp> is to specify where to <em>install 261 1.1 mrg GCC</em>. The local header files in <samp><span class="file">/usr/local/include</span></samp>—if you put 262 1.1 mrg any in that directory—are not part of GCC. They are part of other 263 1.1 mrg programs—perhaps many others. (GCC installs its own header files in 264 1.1 mrg another directory which is based on the <samp><span class="option">--prefix</span></samp> value.) 265 1.1 mrg 266 1.1 mrg <p>Both the local-prefix include directory and the GCC-prefix include 267 1.1 mrg directory are part of GCC's “system include” directories. Although these 268 1.1 mrg two directories are not fixed, they need to be searched in the proper 269 1.1 mrg order for the correct processing of the include_next directive. The 270 1.1 mrg local-prefix include directory is searched before the GCC-prefix 271 1.1 mrg include directory. Another characteristic of system include directories 272 1.1 mrg is that pedantic warnings are turned off for headers in these directories. 273 1.1 mrg 274 1.1 mrg <p>Some autoconf macros add <samp><span class="option">-I </span><var>directory</var></samp> options to the 275 1.1 mrg compiler command line, to ensure that directories containing installed 276 1.1 mrg packages' headers are searched. When <var>directory</var> is one of GCC's 277 1.1 mrg system include directories, GCC will ignore the option so that system 278 1.1 mrg directories continue to be processed in the correct order. This 279 1.1 mrg may result in a search order different from what was specified but the 280 1.1 mrg directory will still be searched. 281 1.1 mrg 282 1.1 mrg <p>GCC automatically searches for ordinary libraries using 283 1.1 mrg <samp><span class="env">GCC_EXEC_PREFIX</span></samp>. Thus, when the same installation prefix is 284 1.1 mrg used for both GCC and packages, GCC will automatically search for 285 1.1 mrg both headers and libraries. This provides a configuration that is 286 1.1 mrg easy to use. GCC behaves in a manner similar to that when it is 287 1.1 mrg installed as a system compiler in <samp><span class="file">/usr</span></samp>. 288 1.1 mrg 289 1.1 mrg <p>Sites that need to install multiple versions of GCC may not want to 290 1.1 mrg use the above simple configuration. It is possible to use the 291 1.1 mrg <samp><span class="option">--program-prefix</span></samp>, <samp><span class="option">--program-suffix</span></samp> and 292 1.1 mrg <samp><span class="option">--program-transform-name</span></samp> options to install multiple versions 293 1.1 mrg into a single directory, but it may be simpler to use different prefixes 294 1.1 mrg and the <samp><span class="option">--with-local-prefix</span></samp> option to specify the location of the 295 1.1 mrg site-specific files for each version. It will then be necessary for 296 1.1 mrg users to specify explicitly the location of local site libraries 297 1.1 mrg (e.g., with <samp><span class="env">LIBRARY_PATH</span></samp>). 298 1.1 mrg 299 1.1 mrg <p>The same value can be used for both <samp><span class="option">--with-local-prefix</span></samp> and 300 1.1 mrg <samp><span class="option">--prefix</span></samp> provided it is not <samp><span class="file">/usr</span></samp>. This can be used 301 1.1 mrg to avoid the default search of <samp><span class="file">/usr/local/include</span></samp>. 302 1.1 mrg 303 1.1 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>! 304 1.1 mrg The directory you use for <samp><span class="option">--with-local-prefix</span></samp> <strong>must not</strong> 305 1.1 mrg contain any of the system's standard header files. If it did contain 306 1.1 mrg them, certain programs would be miscompiled (including GNU Emacs, on 307 1.1 mrg certain targets), because this would override and nullify the header 308 1.1 mrg file corrections made by the <samp><span class="command">fixincludes</span></samp> script. 309 1.1 mrg 310 1.1 mrg <p>Indications are that people who use this option use it based on mistaken 311 1.1 mrg ideas of what it is for. People use it as if it specified where to 312 1.1 mrg install part of GCC. Perhaps they make this assumption because 313 1.1 mrg installing GCC creates the directory. 314 1.1 mrg 315 1.1 mrg <br><dt><code>--enable-shared[=</code><var>package</var><code>[,...]]</code><dd>Build shared versions of libraries, if shared libraries are supported on 316 1.1 mrg the target platform. Unlike GCC 2.95.x and earlier, shared libraries 317 1.1 mrg are enabled by default on all platforms that support shared libraries. 318 1.1 mrg 319 1.1 mrg <p>If a list of packages is given as an argument, build shared libraries 320 1.1 mrg only for the listed packages. For other packages, only static libraries 321 1.1 mrg will be built. Package names currently recognized in the GCC tree are 322 1.1 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 323 1.1 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>’, 324 1.1 mrg ‘<samp><span class="samp">ada</span></samp>’, ‘<samp><span class="samp">libada</span></samp>’, ‘<samp><span class="samp">libjava</span></samp>’ and ‘<samp><span class="samp">libobjc</span></samp>’. 325 1.1 mrg Note ‘<samp><span class="samp">libiberty</span></samp>’ does not support shared libraries at all. 326 1.1 mrg 327 1.1 mrg <p>Use <samp><span class="option">--disable-shared</span></samp> to build only static libraries. Note that 328 1.1 mrg <samp><span class="option">--disable-shared</span></samp> does not accept a list of package names as 329 1.1 mrg argument, only <samp><span class="option">--enable-shared</span></samp> does. 330 1.1 mrg 331 1.1 mrg <br><dt><code><a name="with_002dgnu_002das"></a>--with-gnu-as</code><dd>Specify that the compiler should assume that the 332 1.1 mrg assembler it finds is the GNU assembler. However, this does not modify 333 1.1 mrg the rules to find an assembler and will result in confusion if the 334 1.1 mrg assembler found is not actually the GNU assembler. (Confusion may also 335 1.1 mrg result if the compiler finds the GNU assembler but has not been 336 1.1 mrg configured with <samp><span class="option">--with-gnu-as</span></samp>.) If you have more than one 337 1.1 mrg assembler installed on your system, you may want to use this option in 338 1.1 mrg connection with <samp><span class="option">--with-as=</span><var>pathname</var></samp> or 339 1.1 mrg <samp><span class="option">--with-build-time-tools=</span><var>pathname</var></samp>. 340 1.1 mrg 341 1.1 mrg <p>The following systems are the only ones where it makes a difference 342 1.1 mrg whether you use the GNU assembler. On any other system, 343 1.1 mrg <samp><span class="option">--with-gnu-as</span></samp> has no effect. 344 1.1 mrg 345 1.1 mrg <ul> 346 1.1 mrg <li>‘<samp><span class="samp">hppa1.0-</span><var>any</var><span class="samp">-</span><var>any</var></samp>’ 347 1.1 mrg <li>‘<samp><span class="samp">hppa1.1-</span><var>any</var><span class="samp">-</span><var>any</var></samp>’ 348 1.1 mrg <li>‘<samp><span class="samp">sparc-sun-solaris2.</span><var>any</var></samp>’ 349 1.1 mrg <li>‘<samp><span class="samp">sparc64-</span><var>any</var><span class="samp">-solaris2.</span><var>any</var></samp>’ 350 1.1 mrg </ul> 351 1.1 mrg 352 1.1 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 353 1.1 mrg <var>pathname</var>, rather than the one found by the standard rules to find 354 1.1 mrg an assembler, which are: 355 1.1 mrg <ul> 356 1.1 mrg <li>Unless GCC is being built with a cross compiler, check the 357 1.1 mrg <samp><var>libexec</var><span class="file">/gcc/</span><var>target</var><span class="file">/</span><var>version</var></samp> directory. 358 1.1 mrg <var>libexec</var> defaults to <samp><var>exec-prefix</var><span class="file">/libexec</span></samp>; 359 1.1 mrg <var>exec-prefix</var> defaults to <var>prefix</var>, which 360 1.1 mrg defaults to <samp><span class="file">/usr/local</span></samp> unless overridden by the 361 1.1 mrg <samp><span class="option">--prefix=</span><var>pathname</var></samp> switch described above. <var>target</var> 362 1.1 mrg is the target system triple, such as ‘<samp><span class="samp">sparc-sun-solaris2.7</span></samp>’, and 363 1.1 mrg <var>version</var> denotes the GCC version, such as 3.0. 364 1.1 mrg 365 1.1 mrg <li>If the target system is the same that you are building on, check 366 1.1 mrg operating system specific directories (e.g. <samp><span class="file">/usr/ccs/bin</span></samp> on 367 1.1 mrg Sun Solaris 2). 368 1.1 mrg 369 1.1 mrg <li>Check in the <samp><span class="env">PATH</span></samp> for a tool whose name is prefixed by the 370 1.1 mrg target system triple. 371 1.1 mrg 372 1.1 mrg <li>Check in the <samp><span class="env">PATH</span></samp> for a tool whose name is not prefixed by the 373 1.1 mrg target system triple, if the host and target system triple are 374 1.1 mrg the same (in other words, we use a host tool if it can be used for 375 1.1 mrg the target as well). 376 1.1 mrg </ul> 377 1.1 mrg 378 1.1 mrg <p>You may want to use <samp><span class="option">--with-as</span></samp> if no assembler 379 1.1 mrg is installed in the directories listed above, or if you have multiple 380 1.1 mrg assemblers installed and want to choose one that is not found by the 381 1.1 mrg above rules. 382 1.1 mrg 383 1.1 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> 384 1.1 mrg but for the linker. 385 1.1 mrg 386 1.1 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> 387 1.1 mrg but for the linker. 388 1.1 mrg 389 1.1 mrg <br><dt><code>--with-stabs</code><dd>Specify that stabs debugging 390 1.1 mrg information should be used instead of whatever format the host normally 391 1.1 mrg uses. Normally GCC uses the same debug format as the host system. 392 1.1 mrg 393 1.1 mrg <p>On MIPS based systems and on Alphas, you must specify whether you want 394 1.1 mrg GCC to create the normal ECOFF debugging format, or to use BSD-style 395 1.1 mrg stabs passed through the ECOFF symbol table. The normal ECOFF debug 396 1.1 mrg format cannot fully handle languages other than C. BSD stabs format can 397 1.1 mrg handle other languages, but it only works with the GNU debugger GDB. 398 1.1 mrg 399 1.1 mrg <p>Normally, GCC uses the ECOFF debugging format by default; if you 400 1.1 mrg prefer BSD stabs, specify <samp><span class="option">--with-stabs</span></samp> when you configure GCC. 401 1.1 mrg 402 1.1 mrg <p>No matter which default you choose when you configure GCC, the user 403 1.1 mrg can use the <samp><span class="option">-gcoff</span></samp> and <samp><span class="option">-gstabs+</span></samp> options to specify explicitly 404 1.1 mrg the debug format for a particular compilation. 405 1.1 mrg 406 1.1 mrg <p><samp><span class="option">--with-stabs</span></samp> is meaningful on the ISC system on the 386, also, if 407 1.1 mrg <samp><span class="option">--with-gas</span></samp> is used. It selects use of stabs debugging 408 1.1 mrg information embedded in COFF output. This kind of debugging information 409 1.1 mrg supports C++ well; ordinary COFF debugging information does not. 410 1.1 mrg 411 1.1 mrg <p><samp><span class="option">--with-stabs</span></samp> is also meaningful on 386 systems running SVR4. It 412 1.1 mrg selects use of stabs debugging information embedded in ELF output. The 413 1.1 mrg C++ compiler currently (2.6.0) does not support the DWARF debugging 414 1.1 mrg information normally used on 386 SVR4 platforms; stabs provide a 415 1.1 mrg workable alternative. This requires gas and gdb, as the normal SVR4 416 1.1 mrg tools can not generate or interpret stabs. 417 1.1 mrg 418 1.1 mrg <br><dt><code>--disable-multilib</code><dd>Specify that multiple target 419 1.1 mrg libraries to support different target variants, calling 420 1.1 mrg conventions, etc. should not be built. The default is to build a 421 1.1 mrg predefined set of them. 422 1.1 mrg 423 1.1 mrg <p>Some targets provide finer-grained control over which multilibs are built 424 1.1 mrg (e.g., <samp><span class="option">--disable-softfloat</span></samp>): 425 1.1 mrg <dl> 426 1.1 mrg <dt><code>arc-*-elf*</code><dd>biendian. 427 1.1 mrg 428 1.1 mrg <br><dt><code>arm-*-*</code><dd>fpu, 26bit, underscore, interwork, biendian, nofmult. 429 1.1 mrg 430 1.1 mrg <br><dt><code>m68*-*-*</code><dd>softfloat, m68881, m68000, m68020. 431 1.1 mrg 432 1.1 mrg <br><dt><code>mips*-*-*</code><dd>single-float, biendian, softfloat. 433 1.1 mrg 434 1.1 mrg <br><dt><code>powerpc*-*-*, rs6000*-*-*</code><dd>aix64, pthread, softfloat, powercpu, powerpccpu, powerpcos, biendian, 435 1.1 mrg sysv, aix. 436 1.1 mrg 437 1.1 mrg </dl> 438 1.1 mrg 439 1.1 mrg <br><dt><code>--with-multilib-list=</code><var>list</var><dt><code>--without-multilib-list</code><dd>Specify what multilibs to build. 440 1.1 mrg Currently only implemented for sh*-*-*. 441 1.1 mrg 442 1.1 mrg <p><var>list</var> is a comma separated list of CPU names. These must be of the 443 1.1 mrg form <code>sh*</code> or <code>m*</code> (in which case they match the compiler option 444 1.1 mrg for that processor). The list should not contain any endian options - 445 1.1 mrg these are handled by <samp><span class="option">--with-endian</span></samp>. 446 1.1 mrg 447 1.1 mrg <p>If <var>list</var> is empty, then there will be no multilibs for extra 448 1.1 mrg processors. The multilib for the secondary endian remains enabled. 449 1.1 mrg 450 1.1 mrg <p>As a special case, if an entry in the list starts with a <code>!</code> 451 1.1 mrg (exclamation point), then it is added to the list of excluded multilibs. 452 1.1 mrg Entries of this sort should be compatible with ‘<samp><span class="samp">MULTILIB_EXCLUDES</span></samp>’ 453 1.1 mrg (once the leading <code>!</code> has been stripped). 454 1.1 mrg 455 1.1 mrg <p>If <samp><span class="option">--with-multilib-list</span></samp> is not given, then a default set of 456 1.1 mrg multilibs is selected based on the value of <samp><span class="option">--target</span></samp>. This is 457 1.1 mrg usually the complete set of libraries, but some targets imply a more 458 1.1 mrg specialized subset. 459 1.1 mrg 460 1.1 mrg <p>Example 1: to configure a compiler for SH4A only, but supporting both 461 1.1 mrg endians, with little endian being the default: 462 1.1 mrg <pre class="smallexample"> --with-cpu=sh4a --with-endian=little,big --with-multilib-list= 463 1.1 mrg </pre> 464 1.1 mrg <p>Example 2: to configure a compiler for both SH4A and SH4AL-DSP, but with 465 1.1 mrg only little endian SH4AL: 466 1.1 mrg <pre class="smallexample"> --with-cpu=sh4a --with-endian=little,big --with-multilib-list=sh4al,!mb/m4al 467 1.1 mrg </pre> 468 1.1 mrg <br><dt><code>--with-endian=</code><var>endians</var><dd>Specify what endians to use. 469 1.1 mrg Currently only implemented for sh*-*-*. 470 1.1 mrg 471 1.1 mrg <p><var>endians</var> may be one of the following: 472 1.1 mrg <dl> 473 1.1 mrg <dt><code>big</code><dd>Use big endian exclusively. 474 1.1 mrg <br><dt><code>little</code><dd>Use little endian exclusively. 475 1.1 mrg <br><dt><code>big,little</code><dd>Use big endian by default. Provide a multilib for little endian. 476 1.1 mrg <br><dt><code>little,big</code><dd>Use little endian by default. Provide a multilib for big endian. 477 1.1 mrg </dl> 478 1.1 mrg 479 1.1 mrg <br><dt><code>--enable-threads</code><dd>Specify that the target 480 1.1 mrg supports threads. This affects the Objective-C compiler and runtime 481 1.1 mrg library, and exception handling for other languages like C++ and Java. 482 1.1 mrg On some systems, this is the default. 483 1.1 mrg 484 1.1 mrg <p>In general, the best (and, in many cases, the only known) threading 485 1.1 mrg model available will be configured for use. Beware that on some 486 1.1 mrg systems, GCC has not been taught what threading models are generally 487 1.1 mrg available for the system. In this case, <samp><span class="option">--enable-threads</span></samp> is an 488 1.1 mrg alias for <samp><span class="option">--enable-threads=single</span></samp>. 489 1.1 mrg 490 1.1 mrg <br><dt><code>--disable-threads</code><dd>Specify that threading support should be disabled for the system. 491 1.1 mrg This is an alias for <samp><span class="option">--enable-threads=single</span></samp>. 492 1.1 mrg 493 1.1 mrg <br><dt><code>--enable-threads=</code><var>lib</var><dd>Specify that 494 1.1 mrg <var>lib</var> is the thread support library. This affects the Objective-C 495 1.1 mrg compiler and runtime library, and exception handling for other languages 496 1.1 mrg like C++ and Java. The possibilities for <var>lib</var> are: 497 1.1 mrg 498 1.1 mrg <dl> 499 1.1 mrg <dt><code>aix</code><dd>AIX thread support. 500 1.1 mrg <br><dt><code>dce</code><dd>DCE thread support. 501 1.1 mrg <br><dt><code>gnat</code><dd>Ada tasking support. For non-Ada programs, this setting is equivalent 502 1.1 mrg to ‘<samp><span class="samp">single</span></samp>’. When used in conjunction with the Ada run time, it 503 1.1 mrg causes GCC to use the same thread primitives as Ada uses. This option 504 1.1 mrg is necessary when using both Ada and the back end exception handling, 505 1.1 mrg which is the default for most Ada targets. 506 1.1 mrg <br><dt><code>mach</code><dd>Generic MACH thread support, known to work on NeXTSTEP. (Please note 507 1.1 mrg that the file needed to support this configuration, <samp><span class="file">gthr-mach.h</span></samp>, is 508 1.1 mrg missing and thus this setting will cause a known bootstrap failure.) 509 1.1 mrg <br><dt><code>no</code><dd>This is an alias for ‘<samp><span class="samp">single</span></samp>’. 510 1.1 mrg <br><dt><code>posix</code><dd>Generic POSIX/Unix98 thread support. 511 1.1 mrg <br><dt><code>posix95</code><dd>Generic POSIX/Unix95 thread support. 512 1.1 mrg <br><dt><code>rtems</code><dd>RTEMS thread support. 513 1.1 mrg <br><dt><code>single</code><dd>Disable thread support, should work for all platforms. 514 1.1 mrg <br><dt><code>solaris</code><dd>Sun Solaris 2/Unix International thread support. Only use this if you 515 1.1 mrg really need to use this legacy API instead of the default, ‘<samp><span class="samp">posix</span></samp>’. 516 1.1 mrg <br><dt><code>vxworks</code><dd>VxWorks thread support. 517 1.1 mrg <br><dt><code>win32</code><dd>Microsoft Win32 API thread support. 518 1.1 mrg <br><dt><code>nks</code><dd>Novell Kernel Services thread support. 519 1.1 mrg </dl> 520 1.1 mrg 521 1.1 mrg <br><dt><code>--enable-tls</code><dd>Specify that the target supports TLS (Thread Local Storage). Usually 522 1.1 mrg configure can correctly determine if TLS is supported. In cases where 523 1.1 mrg it guesses incorrectly, TLS can be explicitly enabled or disabled with 524 1.1 mrg <samp><span class="option">--enable-tls</span></samp> or <samp><span class="option">--disable-tls</span></samp>. This can happen if 525 1.1 mrg the assembler supports TLS but the C library does not, or if the 526 1.1 mrg assumptions made by the configure test are incorrect. 527 1.1 mrg 528 1.1 mrg <br><dt><code>--disable-tls</code><dd>Specify that the target does not support TLS. 529 1.1 mrg This is an alias for <samp><span class="option">--enable-tls=no</span></samp>. 530 1.1 mrg 531 1.1 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. 532 1.1 mrg <var>cpu</var> will be used as the default value of the <samp><span class="option">-mcpu=</span></samp> switch. 533 1.1 mrg This option is only supported on some targets, including ARM, i386, M68k, 534 1.1 mrg PowerPC, and SPARC. The <samp><span class="option">--with-cpu-32</span></samp> and 535 1.1 mrg <samp><span class="option">--with-cpu-64</span></samp> options specify separate default CPUs for 536 1.1 mrg 32-bit and 64-bit modes; these options are only supported for i386, 537 1.1 mrg x86-64 and PowerPC. 538 1.1 mrg 539 1.1 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>, 540 1.1 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> 541 1.1 mrg options and for <samp><span class="option">-mhard-float</span></samp> or <samp><span class="option">-msoft-float</span></samp>. As with 542 1.1 mrg <samp><span class="option">--with-cpu</span></samp>, which switches will be accepted and acceptable values 543 1.1 mrg of the arguments depend on the target. 544 1.1 mrg 545 1.1 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>. 546 1.1 mrg This option is only supported on ARM targets. 547 1.1 mrg 548 1.1 mrg <br><dt><code>--with-fpmath=sse</code><dd>Specify if the compiler should default to <samp><span class="option">-msse2</span></samp> and 549 1.1 mrg <samp><span class="option">-mfpmath=sse</span></samp>. This option is only supported on i386 and 550 1.1 mrg x86-64 targets. 551 1.1 mrg 552 1.1 mrg <br><dt><code>--with-divide=</code><var>type</var><dd>Specify how the compiler should generate code for checking for 553 1.1 mrg division by zero. This option is only supported on the MIPS target. 554 1.1 mrg The possibilities for <var>type</var> are: 555 1.1 mrg <dl> 556 1.1 mrg <dt><code>traps</code><dd>Division by zero checks use conditional traps (this is the default on 557 1.1 mrg systems that support conditional traps). 558 1.1 mrg <br><dt><code>breaks</code><dd>Division by zero checks use the break instruction. 559 1.1 mrg </dl> 560 1.1 mrg 561 1.1 mrg <!-- If you make -with-llsc the default for additional targets, --> 562 1.1 mrg <!-- update the -with-llsc description in the MIPS section below. --> 563 1.1 mrg <br><dt><code>--with-llsc</code><dd>On MIPS targets, make <samp><span class="option">-mllsc</span></samp> the default when no 564 1.1.1.1.2.1 yamt <samp><span class="option">-mno-llsc</span></samp> option is passed. This is the default for 565 1.1 mrg Linux-based targets, as the kernel will emulate them if the ISA does 566 1.1 mrg not provide them. 567 1.1 mrg 568 1.1 mrg <br><dt><code>--without-llsc</code><dd>On MIPS targets, make <samp><span class="option">-mno-llsc</span></samp> the default when no 569 1.1 mrg <samp><span class="option">-mllsc</span></samp> option is passed. 570 1.1 mrg 571 1.1 mrg <br><dt><code>--with-synci</code><dd>On MIPS targets, make <samp><span class="option">-msynci</span></samp> the default when no 572 1.1 mrg <samp><span class="option">-mno-synci</span></samp> option is passed. 573 1.1 mrg 574 1.1 mrg <br><dt><code>--without-synci</code><dd>On MIPS targets, make <samp><span class="option">-mno-synci</span></samp> the default when no 575 1.1 mrg <samp><span class="option">-msynci</span></samp> option is passed. This is the default. 576 1.1 mrg 577 1.1 mrg <br><dt><code>--with-mips-plt</code><dd>On MIPS targets, make use of copy relocations and PLTs. 578 1.1 mrg These features are extensions to the traditional 579 1.1 mrg SVR4-based MIPS ABIs and require support from GNU binutils 580 1.1 mrg and the runtime C library. 581 1.1 mrg 582 1.1 mrg <br><dt><code>--enable-__cxa_atexit</code><dd>Define if you want to use __cxa_atexit, rather than atexit, to 583 1.1 mrg register C++ destructors for local statics and global objects. 584 1.1 mrg This is essential for fully standards-compliant handling of 585 1.1 mrg destructors, but requires __cxa_atexit in libc. This option is currently 586 1.1 mrg only available on systems with GNU libc. When enabled, this will cause 587 1.1 mrg <samp><span class="option">-fuse-cxa-atexit</span></samp> to be passed by default. 588 1.1 mrg 589 1.1 mrg <br><dt><code>--enable-target-optspace</code><dd>Specify that target 590 1.1 mrg libraries should be optimized for code space instead of code speed. 591 1.1 mrg This is the default for the m32r platform. 592 1.1 mrg 593 1.1 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 594 1.1 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>. 595 1.1 mrg 596 1.1 mrg <br><dt><code>--enable-comdat</code><dd>Enable COMDAT group support. This is primarily used to override the 597 1.1 mrg automatically detected value. 598 1.1 mrg 599 1.1 mrg <br><dt><code>--enable-initfini-array</code><dd>Force the use of sections <code>.init_array</code> and <code>.fini_array</code> 600 1.1 mrg (instead of <code>.init</code> and <code>.fini</code>) for constructors and 601 1.1 mrg destructors. Option <samp><span class="option">--disable-initfini-array</span></samp> has the 602 1.1 mrg opposite effect. If neither option is specified, the configure script 603 1.1 mrg will try to guess whether the <code>.init_array</code> and 604 1.1 mrg <code>.fini_array</code> sections are supported and, if they are, use them. 605 1.1 mrg 606 1.1 mrg <br><dt><code>--enable-build-with-cxx</code><dd>Build GCC using a C++ compiler rather than a C compiler. This is an 607 1.1 mrg experimental option which may become the default in a later release. 608 1.1 mrg 609 1.1 mrg <br><dt><code>--enable-maintainer-mode</code><dd>The build rules that regenerate the Autoconf and Automake output files as 610 1.1 mrg well as the GCC master message catalog <samp><span class="file">gcc.pot</span></samp> are normally 611 1.1 mrg disabled. This is because it can only be rebuilt if the complete source 612 1.1 mrg tree is present. If you have changed the sources and want to rebuild the 613 1.1 mrg catalog, configuring with <samp><span class="option">--enable-maintainer-mode</span></samp> will enable 614 1.1 mrg this. Note that you need a recent version of the <code>gettext</code> tools 615 1.1 mrg to do so. 616 1.1 mrg 617 1.1 mrg <br><dt><code>--disable-bootstrap</code><dd>For a native build, the default configuration is to perform 618 1.1 mrg a 3-stage bootstrap of the compiler when ‘<samp><span class="samp">make</span></samp>’ is invoked, 619 1.1 mrg testing that GCC can compile itself correctly. If you want to disable 620 1.1 mrg this process, you can configure with <samp><span class="option">--disable-bootstrap</span></samp>. 621 1.1 mrg 622 1.1 mrg <br><dt><code>--enable-bootstrap</code><dd>In special cases, you may want to perform a 3-stage build 623 1.1 mrg even if the target and host triplets are different. 624 1.1 mrg This is possible when the host can run code compiled for 625 1.1 mrg the target (e.g. host is i686-linux, target is i486-linux). 626 1.1 mrg Starting from GCC 4.2, to do this you have to configure explicitly 627 1.1 mrg with <samp><span class="option">--enable-bootstrap</span></samp>. 628 1.1 mrg 629 1.1 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 630 1.1 mrg info manuals and man pages that are built from the .texi files are present 631 1.1 mrg in the SVN development tree. When building GCC from that development tree, 632 1.1 mrg or from one of our snapshots, those generated files are placed in your 633 1.1 mrg build directory, which allows for the source to be in a readonly 634 1.1 mrg directory. 635 1.1 mrg 636 1.1 mrg <p>If you configure with <samp><span class="option">--enable-generated-files-in-srcdir</span></samp> then those 637 1.1 mrg generated files will go into the source directory. This is mainly intended 638 1.1 mrg for generating release or prerelease tarballs of the GCC sources, since it 639 1.1 mrg is not a requirement that the users of source releases to have flex, Bison, 640 1.1 mrg or makeinfo. 641 1.1 mrg 642 1.1 mrg <br><dt><code>--enable-version-specific-runtime-libs</code><dd>Specify 643 1.1 mrg that runtime libraries should be installed in the compiler specific 644 1.1 mrg subdirectory (<samp><var>libdir</var><span class="file">/gcc</span></samp>) rather than the usual places. In 645 1.1 mrg addition, ‘<samp><span class="samp">libstdc++</span></samp>’'s include files will be installed into 646 1.1 mrg <samp><var>libdir</var></samp> unless you overruled it by using 647 1.1 mrg <samp><span class="option">--with-gxx-include-dir=</span><var>dirname</var></samp>. Using this option is 648 1.1 mrg particularly useful if you intend to use several versions of GCC in 649 1.1 mrg parallel. This is currently supported by ‘<samp><span class="samp">libgfortran</span></samp>’, 650 1.1 mrg ‘<samp><span class="samp">libjava</span></samp>’, ‘<samp><span class="samp">libmudflap</span></samp>’, ‘<samp><span class="samp">libstdc++</span></samp>’, and ‘<samp><span class="samp">libobjc</span></samp>’. 651 1.1 mrg 652 1.1 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 653 1.1 mrg their runtime libraries should be built. For a list of valid values for 654 1.1 mrg <var>langN</var> you can issue the following command in the 655 1.1 mrg <samp><span class="file">gcc</span></samp> directory of your GCC source tree:<br> 656 1.1 mrg <pre class="smallexample"> grep language= */config-lang.in 657 1.1 mrg </pre> 658 1.1 mrg <p>Currently, you can use any of the following: 659 1.1 mrg <code>all</code>, <code>ada</code>, <code>c</code>, <code>c++</code>, <code>fortran</code>, <code>java</code>, 660 1.1 mrg <code>objc</code>, <code>obj-c++</code>. 661 1.1 mrg Building the Ada compiler has special requirements, see below. 662 1.1 mrg If you do not pass this flag, or specify the option <code>all</code>, then all 663 1.1 mrg default languages available in the <samp><span class="file">gcc</span></samp> sub-tree will be configured. 664 1.1 mrg Ada and Objective-C++ are not default languages; the rest are. 665 1.1 mrg Re-defining <code>LANGUAGES</code> when calling ‘<samp><span class="samp">make</span></samp>’ <strong>does not</strong> 666 1.1 mrg work anymore, as those language sub-directories might not have been 667 1.1 mrg configured! 668 1.1 mrg 669 1.1 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 670 1.1 mrg libraries should be built with the system C compiler during stage 1 of 671 1.1 mrg the bootstrap process, rather than only in later stages with the 672 1.1 mrg bootstrapped C compiler. The list of valid values is the same as for 673 1.1 mrg <samp><span class="option">--enable-languages</span></samp>, and the option <code>all</code> will select all 674 1.1 mrg of the languages enabled by <samp><span class="option">--enable-languages</span></samp>. This option is 675 1.1 mrg primarily useful for GCC development; for instance, when a development 676 1.1 mrg version of the compiler cannot bootstrap due to compiler bugs, or when 677 1.1 mrg one is debugging front ends other than the C front end. When this 678 1.1 mrg option is used, one can then build the target libraries for the 679 1.1 mrg specified languages with the stage-1 compiler by using <samp><span class="command">make 680 1.1 mrg stage1-bubble all-target</span></samp>, or run the testsuite on the stage-1 compiler 681 1.1 mrg for the specified languages using <samp><span class="command">make stage1-start check-gcc</span></samp>. 682 1.1 mrg 683 1.1 mrg <br><dt><code>--disable-libada</code><dd>Specify that the run-time libraries and tools used by GNAT should not 684 1.1 mrg be built. This can be useful for debugging, or for compatibility with 685 1.1 mrg previous Ada build procedures, when it was required to explicitly 686 1.1 mrg do a ‘<samp><span class="samp">make -C gcc gnatlib_and_tools</span></samp>’. 687 1.1 mrg 688 1.1 mrg <br><dt><code>--disable-libssp</code><dd>Specify that the run-time libraries for stack smashing protection 689 1.1 mrg should not be built. 690 1.1 mrg 691 1.1 mrg <br><dt><code>--disable-libgomp</code><dd>Specify that the run-time libraries used by GOMP should not be built. 692 1.1 mrg 693 1.1 mrg <br><dt><code>--with-dwarf2</code><dd>Specify that the compiler should 694 1.1 mrg use DWARF 2 debugging information as the default. 695 1.1 mrg 696 1.1 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. 697 1.1 mrg These are compilers that are able to generate either 64-bit or 32-bit 698 1.1 mrg code. Typically, the corresponding 32-bit target, e.g. 699 1.1 mrg powerpc-linux for powerpc64-linux, only generates 32-bit code. This 700 1.1 mrg option enables the 32-bit target to be a bi-arch compiler, which is 701 1.1 mrg useful when you want a bi-arch compiler that defaults to 32-bit, and 702 1.1 mrg you are building a bi-arch or multi-arch binutils in a combined tree. 703 1.1 mrg On mips-linux, this will build a tri-arch compiler (ABI o32/n32/64), 704 1.1 mrg defaulted to o32. 705 1.1 mrg Currently, this option only affects sparc-linux, powerpc-linux, x86-linux 706 1.1 mrg and mips-linux. 707 1.1 mrg 708 1.1 mrg <br><dt><code>--enable-secureplt</code><dd>This option enables <samp><span class="option">-msecure-plt</span></samp> by default for powerpc-linux. 709 1.1 mrg See “RS/6000 and PowerPC Options” in the main manual 710 1.1 mrg 711 1.1 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. 712 1.1 mrg See “i386 and x86-64 Options” in the main manual 713 1.1 mrg 714 1.1 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 715 1.1 mrg to look up installations paths in the registry using the following key: 716 1.1 mrg 717 1.1 mrg <pre class="smallexample"> <code>HKEY_LOCAL_MACHINE\SOFTWARE\Free Software Foundation\</code><var>key</var> 718 1.1 mrg </pre> 719 1.1 mrg <p><var>key</var> defaults to GCC version number, and can be overridden by the 720 1.1 mrg <samp><span class="option">--enable-win32-registry=</span><var>key</var></samp> option. Vendors and distributors 721 1.1 mrg who use custom installers are encouraged to provide a different key, 722 1.1 mrg perhaps one comprised of vendor name and GCC version number, to 723 1.1 mrg avoid conflict with existing installations. This feature is enabled 724 1.1 mrg by default, and can be disabled by <samp><span class="option">--disable-win32-registry</span></samp> 725 1.1 mrg option. This option has no effect on the other hosts. 726 1.1 mrg 727 1.1 mrg <br><dt><code>--nfp</code><dd>Specify that the machine does not have a floating point unit. This 728 1.1 mrg option only applies to ‘<samp><span class="samp">m68k-sun-sunos</span><var>n</var></samp>’. On any other 729 1.1 mrg system, <samp><span class="option">--nfp</span></samp> has no effect. 730 1.1 mrg 731 1.1 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 732 1.1 mrg compiler are built with <samp><span class="option">-Werror</span></samp> in bootstrap stage2 and later. 733 1.1 mrg If you don't specify it, <samp><span class="option">-Werror</span></samp> is turned on for the main 734 1.1 mrg development trunk. However it defaults to off for release branches and 735 1.1 mrg final releases. The specific files which get <samp><span class="option">-Werror</span></samp> are 736 1.1 mrg controlled by the Makefiles. 737 1.1 mrg 738 1.1 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 739 1.1 mrg consistency checks of the requested complexity. This does not change the 740 1.1 mrg generated code, but adds error checking within the compiler. This will 741 1.1 mrg slow down the compiler and may only work properly if you are building 742 1.1 mrg the compiler with GCC. This is ‘<samp><span class="samp">yes</span></samp>’ by default when building 743 1.1 mrg from SVN or snapshots, but ‘<samp><span class="samp">release</span></samp>’ for releases. The default 744 1.1 mrg for building the stage1 compiler is ‘<samp><span class="samp">yes</span></samp>’. More control 745 1.1 mrg over the checks may be had by specifying <var>list</var>. The categories of 746 1.1 mrg checks available are ‘<samp><span class="samp">yes</span></samp>’ (most common checks 747 1.1 mrg ‘<samp><span class="samp">assert,misc,tree,gc,rtlflag,runtime</span></samp>’), ‘<samp><span class="samp">no</span></samp>’ (no checks at 748 1.1 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 749 1.1 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>’). 750 1.1 mrg Individual checks can be enabled with these flags ‘<samp><span class="samp">assert</span></samp>’, 751 1.1 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>’, 752 1.1 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>’. 753 1.1 mrg 754 1.1 mrg <p>The ‘<samp><span class="samp">valgrind</span></samp>’ check requires the external <samp><span class="command">valgrind</span></samp> 755 1.1 mrg simulator, available from <a href="http://valgrind.org/">http://valgrind.org/</a>. The 756 1.1 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. 757 1.1 mrg To disable all checking, ‘<samp><span class="samp">--disable-checking</span></samp>’ or 758 1.1 mrg ‘<samp><span class="samp">--enable-checking=none</span></samp>’ must be explicitly requested. Disabling 759 1.1 mrg assertions will make the compiler and runtime slightly faster but 760 1.1 mrg increase the risk of undetected internal errors causing wrong code to be 761 1.1 mrg generated. 762 1.1 mrg 763 1.1 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 764 1.1 mrg compiler will be built with ‘<samp><span class="samp">yes</span></samp>’ checking enabled, otherwise 765 1.1 mrg the stage1 checking flags are the same as specified by 766 1.1 mrg <samp><span class="option">--enable-checking</span></samp>. To build the stage1 compiler with 767 1.1 mrg different checking options use <samp><span class="option">--enable-stage1-checking</span></samp>. 768 1.1 mrg The list of checking options is the same as for <samp><span class="option">--enable-checking</span></samp>. 769 1.1 mrg If your system is too slow or too small to bootstrap a released compiler 770 1.1 mrg with checking for stage1 enabled, you can use ‘<samp><span class="samp">--disable-stage1-checking</span></samp>’ 771 1.1 mrg to disable checking for the stage1 compiler. 772 1.1 mrg 773 1.1 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 774 1.1 mrg information, every time it is run. This is for internal development 775 1.1 mrg purposes, and only works when the compiler is being built with gcc. The 776 1.1 mrg <var>level</var> argument controls whether the compiler is built optimized or 777 1.1 mrg not, values are ‘<samp><span class="samp">opt</span></samp>’ and ‘<samp><span class="samp">noopt</span></samp>’. For coverage analysis you 778 1.1 mrg want to disable optimization, for performance analysis you want to 779 1.1 mrg enable optimization. When coverage is enabled, the default level is 780 1.1 mrg without optimization. 781 1.1 mrg 782 1.1 mrg <br><dt><code>--enable-gather-detailed-mem-stats</code><dd>When this option is specified more detailed information on memory 783 1.1 mrg allocation is gathered. This information is printed when using 784 1.1 mrg <samp><span class="option">-fmem-report</span></samp>. 785 1.1 mrg 786 1.1 mrg <br><dt><code>--with-gc</code><dt><code>--with-gc=</code><var>choice</var><dd>With this option you can specify the garbage collector implementation 787 1.1 mrg used during the compilation process. <var>choice</var> can be one of 788 1.1 mrg ‘<samp><span class="samp">page</span></samp>’ and ‘<samp><span class="samp">zone</span></samp>’, where ‘<samp><span class="samp">page</span></samp>’ is the default. 789 1.1 mrg 790 1.1 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), 791 1.1 mrg which lets GCC output diagnostics in languages other than American 792 1.1 mrg English. Native Language Support is enabled by default if not doing a 793 1.1 mrg canadian cross build. The <samp><span class="option">--disable-nls</span></samp> option disables NLS. 794 1.1 mrg 795 1.1 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 796 1.1 mrg procedure to prefer its copy of GNU <samp><span class="command">gettext</span></samp>. 797 1.1 mrg 798 1.1 mrg <br><dt><code>--with-catgets</code><dd>If NLS is enabled, and if the host lacks <code>gettext</code> but has the 799 1.1 mrg inferior <code>catgets</code> interface, the GCC build procedure normally 800 1.1 mrg ignores <code>catgets</code> and instead uses GCC's copy of the GNU 801 1.1 mrg <code>gettext</code> library. The <samp><span class="option">--with-catgets</span></samp> option causes the 802 1.1 mrg build procedure to use the host's <code>catgets</code> in this situation. 803 1.1 mrg 804 1.1 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 805 1.1 mrg libiconv library files in <samp><var>dir</var><span class="file">/lib</span></samp>. 806 1.1 mrg 807 1.1 mrg <br><dt><code>--enable-obsolete</code><dd>Enable configuration for an obsoleted system. If you attempt to 808 1.1 mrg configure GCC for a system (build, host, or target) which has been 809 1.1 mrg obsoleted, and you do not specify this flag, configure will halt with an 810 1.1 mrg error message. 811 1.1 mrg 812 1.1 mrg <p>All support for systems which have been obsoleted in one release of GCC 813 1.1 mrg is removed entirely in the next major release, unless someone steps 814 1.1 mrg forward to maintain the port. 815 1.1 mrg 816 1.1 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 817 1.1 mrg that is in the IEEE 754-2008 standard. This is enabled by default only 818 1.1 mrg on PowerPC, i386, and x86_64 GNU/Linux systems. Other systems may also 819 1.1 mrg support it, but require the user to specifically enable it. You can 820 1.1 mrg optionally control which decimal floating point format is used (either 821 1.1 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) 822 1.1 mrg format is default on i386 and x86_64 systems, and the ‘<samp><span class="samp">dpd</span></samp>’ 823 1.1 mrg (densely packed decimal) format is default on PowerPC systems. 824 1.1 mrg 825 1.1 mrg <br><dt><code>--enable-fixed-point</code><dt><code>--disable-fixed-point</code><dd>Enable (or disable) support for C fixed-point arithmetic. 826 1.1 mrg This option is enabled by default for some targets (such as MIPS) which 827 1.1 mrg have hardware-support for fixed-point operations. On other targets, you 828 1.1 mrg may enable this option manually. 829 1.1 mrg 830 1.1 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 831 1.1 mrg GNU/Linux architectures. If using <code>--without-long-double-128</code>, 832 1.1 mrg <code>long double</code> will be by default 64-bit, the same as <code>double</code> type. 833 1.1 mrg When neither of these configure options are used, the default will be 834 1.1 mrg 128-bit <code>long double</code> when built against GNU C Library 2.4 and later, 835 1.1 mrg 64-bit <code>long double</code> otherwise. 836 1.1 mrg 837 1.1 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 do not have GMP (the GNU Multiple Precision library), the MPFR 838 1.1 mrg library and/or the MPC library installed in a standard location and 839 1.1 mrg you want to build GCC, you can explicitly specify the directory where 840 1.1 mrg they are installed (‘<samp><span class="samp">--with-gmp=</span><var>gmpinstalldir</var></samp>’, 841 1.1 mrg ‘<samp><span class="samp">--with-mpfr=</span><var>mpfrinstalldir</var></samp>’, 842 1.1 mrg ‘<samp><span class="samp">--with-mpc=</span><var>mpcinstalldir</var></samp>’). The 843 1.1 mrg <samp><span class="option">--with-gmp=</span><var>gmpinstalldir</var></samp> option is shorthand for 844 1.1 mrg <samp><span class="option">--with-gmp-lib=</span><var>gmpinstalldir</var><span class="option">/lib</span></samp> and 845 1.1 mrg <samp><span class="option">--with-gmp-include=</span><var>gmpinstalldir</var><span class="option">/include</span></samp>. Likewise the 846 1.1 mrg <samp><span class="option">--with-mpfr=</span><var>mpfrinstalldir</var></samp> option is shorthand for 847 1.1 mrg <samp><span class="option">--with-mpfr-lib=</span><var>mpfrinstalldir</var><span class="option">/lib</span></samp> and 848 1.1 mrg <samp><span class="option">--with-mpfr-include=</span><var>mpfrinstalldir</var><span class="option">/include</span></samp>, also the 849 1.1 mrg <samp><span class="option">--with-mpc=</span><var>mpcinstalldir</var></samp> option is shorthand for 850 1.1 mrg <samp><span class="option">--with-mpc-lib=</span><var>mpcinstalldir</var><span class="option">/lib</span></samp> and 851 1.1 mrg <samp><span class="option">--with-mpc-include=</span><var>mpcinstalldir</var><span class="option">/include</span></samp>. If these 852 1.1 mrg shorthand assumptions are not correct, you can use the explicit 853 1.1 mrg include and lib options directly. 854 1.1 mrg 855 1.1 mrg <br><dt><code>--with-ppl=</code><var>pathname</var><dt><code>--with-ppl-include=</code><var>pathname</var><dt><code>--with-ppl-lib=</code><var>pathname</var><dt><code>--with-cloog=</code><var>pathname</var><dt><code>--with-cloog-include=</code><var>pathname</var><dt><code>--with-cloog-lib=</code><var>pathname</var><dd>If you do not have PPL (the Parma Polyhedra Library) and the CLooG 856 1.1 mrg libraries installed in a standard location and you want to build GCC, 857 1.1 mrg you can explicitly specify the directory where they are installed 858 1.1 mrg (‘<samp><span class="samp">--with-ppl=</span><var>pplinstalldir</var></samp>’, 859 1.1 mrg ‘<samp><span class="samp">--with-cloog=</span><var>clooginstalldir</var></samp>’). The 860 1.1 mrg <samp><span class="option">--with-ppl=</span><var>pplinstalldir</var></samp> option is shorthand for 861 1.1 mrg <samp><span class="option">--with-ppl-lib=</span><var>pplinstalldir</var><span class="option">/lib</span></samp> and 862 1.1 mrg <samp><span class="option">--with-ppl-include=</span><var>pplinstalldir</var><span class="option">/include</span></samp>. Likewise the 863 1.1 mrg <samp><span class="option">--with-cloog=</span><var>clooginstalldir</var></samp> option is shorthand for 864 1.1 mrg <samp><span class="option">--with-cloog-lib=</span><var>clooginstalldir</var><span class="option">/lib</span></samp> and 865 1.1 mrg <samp><span class="option">--with-cloog-include=</span><var>clooginstalldir</var><span class="option">/include</span></samp>. If these 866 1.1 mrg shorthand assumptions are not correct, you can use the explicit 867 1.1 mrg include and lib options directly. 868 1.1 mrg 869 1.1 mrg <br><dt><code>--with-host-libstdcxx=</code><var>linker-args</var><dd>If you are linking with a static copy of PPL, you can use this option 870 1.1 mrg to specify how the linker should find the standard C++ library used 871 1.1 mrg internally by PPL. Typical values of <var>linker-args</var> might be 872 1.1 mrg ‘<samp><span class="samp">-lstdc++</span></samp>’ or ‘<samp><span class="samp">-Wl,-Bstatic,-lstdc++,-Bdynamic -lm</span></samp>’. If you are 873 1.1 mrg linking with a shared copy of PPL, you probably do not need this 874 1.1 mrg option; shared library dependencies will cause the linker to search 875 1.1 mrg for the standard C++ library automatically. 876 1.1 mrg 877 1.1 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 878 1.1 mrg stage 1 of GCC. These are also used when linking GCC if configured with 879 1.1 mrg <samp><span class="option">--disable-bootstrap</span></samp>. By default no special flags are used. 880 1.1 mrg 881 1.1 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 1 882 1.1 mrg of GCC. These are also used when linking GCC if configured with 883 1.1 mrg <samp><span class="option">--disable-bootstrap</span></samp>. The default is the argument to 884 1.1 mrg <samp><span class="option">--with-host-libstdcxx</span></samp>, if specified. 885 1.1 mrg 886 1.1 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 887 1.1 mrg stage 2 and later when bootstrapping GCC. By default no special flags 888 1.1 mrg are used. 889 1.1 mrg 890 1.1 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 2 891 1.1 mrg and later when bootstrapping GCC. The default is the argument to 892 1.1 mrg <samp><span class="option">--with-host-libstdcxx</span></samp>, if specified. 893 1.1 mrg 894 1.1 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 895 1.1 mrg building runtime libraries. ‘<samp><var>map</var></samp>’ is a space-separated 896 1.1 mrg list of maps of the form ‘<samp><var>old</var><span class="samp">=</span><var>new</var></samp>’. 897 1.1 mrg 898 1.1 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 899 1.1 mrg links (links performed without the <samp><span class="option">-r</span></samp> or <samp><span class="option">--relocatable</span></samp> 900 1.1 mrg option), if the linker supports it. If you specify 901 1.1 mrg <samp><span class="option">--enable-linker-build-id</span></samp>, but your linker does not 902 1.1 mrg support <samp><span class="option">--build-id</span></samp> option, a warning is issued and the 903 1.1 mrg <samp><span class="option">--enable-linker-build-id</span></samp> option is ignored. The default is off. 904 1.1 mrg 905 1.1 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 906 1.1 mrg static data members and inline function local statics. Enabled by 907 1.1 mrg default for a native toolchain with an assembler that accepts it and 908 1.1 mrg GLIBC 2.11 or above, otherwise disabled. 909 1.1 mrg 910 1.1 mrg <br><dt><code>--enable-lto</code><dd>Enable support for link-time optimization (LTO). This is enabled by 911 1.1 mrg default if a working libelf implementation is found (see 912 1.1 mrg <samp><span class="option">--with-libelf</span></samp>). 913 1.1 mrg 914 1.1 mrg <br><dt><code>--with-libelf=</code><var>pathname</var><dt><code>--with-libelf-include=</code><var>pathname</var><dt><code>--with-libelf-lib=</code><var>pathname</var><dd>If you do not have libelf installed in a standard location and you 915 1.1 mrg want to enable support for link-time optimization (LTO), you can 916 1.1 mrg explicitly specify the directory where libelf is installed 917 1.1 mrg (‘<samp><span class="samp">--with-libelf=</span><var>libelfinstalldir</var></samp>’). The 918 1.1 mrg <samp><span class="option">--with-libelf=</span><var>libelfinstalldir</var></samp> option is shorthand for 919 1.1 mrg <samp><span class="option">--with-libelf-include=</span><var>libelfinstalldir</var><span class="option">/include</span></samp> 920 1.1 mrg <samp><span class="option">--with-libelf-lib=</span><var>libelfinstalldir</var><span class="option">/lib</span></samp>. 921 1.1 mrg 922 1.1 mrg <br><dt><code>--enable-gold</code><dd>Enable support for using <samp><span class="command">gold</span></samp> as the linker. If gold support is 923 1.1 mrg enabled together with <samp><span class="option">--enable-lto</span></samp>, an additional directory 924 1.1 mrg <samp><span class="file">lto-plugin</span></samp> will be built. The code in this directory is a 925 1.1 mrg plugin for gold that allows the link-time optimizer to extract object 926 1.1 mrg files with LTO information out of library archives. See 927 1.1 mrg <samp><span class="option">-flto</span></samp> and <samp><span class="option">-fwhopr</span></samp> for details. 928 1.1 mrg </dl> 929 1.1 mrg 930 1.1 mrg <h4 class="subheading"><a name="TOC3"></a>Cross-Compiler-Specific Options</h4> 931 1.1 mrg 932 1.1 mrg <p>The following options only apply to building cross compilers. 933 1.1 mrg 934 1.1 mrg <dl> 935 1.1 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 a 936 1.1 mrg (subset of) the root filesystem of the target operating system. 937 1.1 mrg Target system headers, libraries and run-time object files will be 938 1.1 mrg searched in there. More specifically, this acts as if 939 1.1 mrg <samp><span class="option">--sysroot=</span><var>dir</var></samp> was added to the default options of the built 940 1.1 mrg compiler. The specified directory is not copied into the 941 1.1 mrg install tree, unlike the options <samp><span class="option">--with-headers</span></samp> and 942 1.1 mrg <samp><span class="option">--with-libs</span></samp> that this option obsoletes. The default value, 943 1.1 mrg in case <samp><span class="option">--with-sysroot</span></samp> is not given an argument, is 944 1.1 mrg <samp><span class="option">${gcc_tooldir}/sys-root</span></samp>. If the specified directory is a 945 1.1 mrg subdirectory of <samp><span class="option">${exec_prefix}</span></samp>, then it will be found relative to 946 1.1 mrg the GCC binaries if the installation tree is moved. 947 1.1 mrg 948 1.1 mrg <p>This option affects the system root for the compiler used to build 949 1.1 mrg target libraries (which runs on the build system) and the compiler newly 950 1.1 mrg installed with <code>make install</code>; it does not affect the compiler which is 951 1.1 mrg used to build GCC itself. 952 1.1 mrg 953 1.1 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 954 1.1 mrg <samp><span class="option">--with-sysroot</span></samp>) while building target libraries, instead of 955 1.1 mrg the directory specified with <samp><span class="option">--with-sysroot</span></samp>. This option is 956 1.1 mrg only useful when you are already using <samp><span class="option">--with-sysroot</span></samp>. You 957 1.1 mrg can use <samp><span class="option">--with-build-sysroot</span></samp> when you are configuring with 958 1.1 mrg <samp><span class="option">--prefix</span></samp> set to a directory that is different from the one in 959 1.1 mrg which you are installing GCC and your target libraries. 960 1.1 mrg 961 1.1 mrg <p>This option affects the system root for the compiler used to build 962 1.1 mrg target libraries (which runs on the build system); it does not affect 963 1.1 mrg the compiler which is used to build GCC itself. 964 1.1 mrg 965 1.1 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>. 966 1.1 mrg Specifies that target headers are available when building a cross compiler. 967 1.1 mrg The <var>dir</var> argument specifies a directory which has the target include 968 1.1 mrg files. These include files will be copied into the <samp><span class="file">gcc</span></samp> install 969 1.1 mrg directory. <em>This option with the </em><var>dir</var><em> argument is required</em> when 970 1.1 mrg building a cross compiler, if <samp><var>prefix</var><span class="file">/</span><var>target</var><span class="file">/sys-include</span></samp> 971 1.1 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 972 1.1 mrg pre-exist, the <var>dir</var> argument may be omitted. <samp><span class="command">fixincludes</span></samp> 973 1.1 mrg will be run on these files to make them compatible with GCC. 974 1.1 mrg 975 1.1 mrg <br><dt><code>--without-headers</code><dd>Tells GCC not use any target headers from a libc when building a cross 976 1.1 mrg compiler. When crossing to GNU/Linux, you need the headers so GCC 977 1.1 mrg can build the exception handling for libgcc. 978 1.1 mrg 979 1.1 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>. 980 1.1 mrg Specifies a list of directories which contain the target runtime 981 1.1 mrg libraries. These libraries will be copied into the <samp><span class="file">gcc</span></samp> install 982 1.1 mrg directory. If the directory list is omitted, this option has no 983 1.1 mrg effect. 984 1.1 mrg 985 1.1 mrg <br><dt><code>--with-newlib</code><dd>Specifies that ‘<samp><span class="samp">newlib</span></samp>’ is 986 1.1 mrg being used as the target C library. This causes <code>__eprintf</code> to be 987 1.1 mrg omitted from <samp><span class="file">libgcc.a</span></samp> on the assumption that it will be provided by 988 1.1 mrg ‘<samp><span class="samp">newlib</span></samp>’. 989 1.1 mrg 990 1.1 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.) 991 1.1 mrg that will be used while building GCC itself. This option can be useful 992 1.1 mrg if the directory layouts are different between the system you are building 993 1.1 mrg GCC on, and the system where you will deploy it. 994 1.1 mrg 995 1.1 mrg <p>For example, on an ‘<samp><span class="samp">ia64-hp-hpux</span></samp>’ system, you may have the GNU 996 1.1 mrg assembler and linker in <samp><span class="file">/usr/bin</span></samp>, and the native tools in a 997 1.1 mrg different path, and build a toolchain that expects to find the 998 1.1 mrg native tools in <samp><span class="file">/usr/bin</span></samp>. 999 1.1 mrg 1000 1.1 mrg <p>When you use this option, you should ensure that <var>dir</var> includes 1001 1.1 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>, 1002 1.1 mrg <samp><span class="command">ranlib</span></samp> and <samp><span class="command">strip</span></samp> if necessary, and possibly 1003 1.1 mrg <samp><span class="command">objdump</span></samp>. Otherwise, GCC may use an inconsistent set of 1004 1.1 mrg tools. 1005 1.1 mrg </dl> 1006 1.1 mrg 1007 1.1 mrg <h4 class="subheading"><a name="TOC4"></a>Java-Specific Options</h4> 1008 1.1 mrg 1009 1.1 mrg <p>The following option applies to the build of the Java front end. 1010 1.1 mrg 1011 1.1 mrg <dl> 1012 1.1 mrg <dt><code>--disable-libgcj</code><dd>Specify that the run-time libraries 1013 1.1 mrg used by GCJ should not be built. This is useful in case you intend 1014 1.1 mrg to use GCJ with some other run-time, or you're going to install it 1015 1.1 mrg separately, or it just happens not to build on your particular 1016 1.1 mrg machine. In general, if the Java front end is enabled, the GCJ 1017 1.1 mrg libraries will be enabled too, unless they're known to not work on 1018 1.1 mrg the target platform. If GCJ is enabled but ‘<samp><span class="samp">libgcj</span></samp>’ isn't built, you 1019 1.1 mrg may need to port it; in this case, before modifying the top-level 1020 1.1 mrg <samp><span class="file">configure.in</span></samp> so that ‘<samp><span class="samp">libgcj</span></samp>’ is enabled by default on this platform, 1021 1.1 mrg you may use <samp><span class="option">--enable-libgcj</span></samp> to override the default. 1022 1.1 mrg 1023 1.1 mrg </dl> 1024 1.1 mrg 1025 1.1 mrg <p>The following options apply to building ‘<samp><span class="samp">libgcj</span></samp>’. 1026 1.1 mrg 1027 1.1 mrg <h5 class="subsubheading"><a name="TOC5"></a>General Options</h5> 1028 1.1 mrg 1029 1.1 mrg <dl> 1030 1.1 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 1031 1.1 mrg <samp><span class="file">.java</span></samp> source files to <samp><span class="file">.class</span></samp>. Instead, it will use the 1032 1.1 mrg <samp><span class="file">.class</span></samp> files from the source tree. If you use this option you 1033 1.1 mrg must have executables named <samp><span class="command">ecj1</span></samp> and <samp><span class="command">gjavah</span></samp> in your path 1034 1.1 mrg for use by the build. You must use this option if you intend to 1035 1.1 mrg modify any <samp><span class="file">.java</span></samp> files in <samp><span class="file">libjava</span></samp>. 1036 1.1 mrg 1037 1.1 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 1038 1.1 mrg ‘<samp><span class="samp">java.home</span></samp>’ system property. It is also used to set 1039 1.1 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 1040 1.1 mrg default ‘<samp><span class="samp">java.home</span></samp>’ is set to <samp><var>prefix</var></samp> and 1041 1.1 mrg ‘<samp><span class="samp">sun.boot.class.path</span></samp>’ to 1042 1.1 mrg <samp><var>datadir</var><span class="file">/java/libgcj-</span><var>version</var><span class="file">.jar</span></samp>. 1043 1.1 mrg 1044 1.1 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 1045 1.1 mrg file containing the Eclipse Java compiler. A specially modified 1046 1.1 mrg version of this compiler is used by <samp><span class="command">gcj</span></samp> to parse 1047 1.1 mrg <samp><span class="file">.java</span></samp> source files. If this option is given, the 1048 1.1 mrg ‘<samp><span class="samp">libjava</span></samp>’ build will create and install an <samp><span class="file">ecj1</span></samp> executable 1049 1.1 mrg which uses this jar file at runtime. 1050 1.1 mrg 1051 1.1 mrg <p>If this option is not given, but an <samp><span class="file">ecj.jar</span></samp> file is found in 1052 1.1 mrg the topmost source tree at configure time, then the ‘<samp><span class="samp">libgcj</span></samp>’ 1053 1.1 mrg build will create and install <samp><span class="file">ecj1</span></samp>, and will also install the 1054 1.1 mrg discovered <samp><span class="file">ecj.jar</span></samp> into a suitable place in the install tree. 1055 1.1 mrg 1056 1.1 mrg <p>If <samp><span class="file">ecj1</span></samp> is not installed, then the user will have to supply one 1057 1.1 mrg on his path in order for <samp><span class="command">gcj</span></samp> to properly parse <samp><span class="file">.java</span></samp> 1058 1.1 mrg source files. A suitable jar is available from 1059 1.1 mrg <a href="ftp://sourceware.org/pub/java/">ftp://sourceware.org/pub/java/</a>. 1060 1.1 mrg 1061 1.1 mrg <br><dt><code>--disable-getenv-properties</code><dd>Don't set system properties from <samp><span class="env">GCJ_PROPERTIES</span></samp>. 1062 1.1 mrg 1063 1.1 mrg <br><dt><code>--enable-hash-synchronization</code><dd>Use a global hash table for monitor locks. Ordinarily, 1064 1.1 mrg ‘<samp><span class="samp">libgcj</span></samp>’'s ‘<samp><span class="samp">configure</span></samp>’ script automatically makes 1065 1.1 mrg the correct choice for this option for your platform. Only use 1066 1.1 mrg this if you know you need the library to be configured differently. 1067 1.1 mrg 1068 1.1 mrg <br><dt><code>--enable-interpreter</code><dd>Enable the Java interpreter. The interpreter is automatically 1069 1.1 mrg enabled by default on all platforms that support it. This option 1070 1.1 mrg is really only useful if you want to disable the interpreter 1071 1.1 mrg (using <samp><span class="option">--disable-interpreter</span></samp>). 1072 1.1 mrg 1073 1.1 mrg <br><dt><code>--disable-java-net</code><dd>Disable java.net. This disables the native part of java.net only, 1074 1.1 mrg using non-functional stubs for native method implementations. 1075 1.1 mrg 1076 1.1 mrg <br><dt><code>--disable-jvmpi</code><dd>Disable JVMPI support. 1077 1.1 mrg 1078 1.1 mrg <br><dt><code>--disable-libgcj-bc</code><dd>Disable BC ABI compilation of certain parts of libgcj. By default, 1079 1.1 mrg some portions of libgcj are compiled with <samp><span class="option">-findirect-dispatch</span></samp> 1080 1.1 mrg and <samp><span class="option">-fno-indirect-classes</span></samp>, allowing them to be overridden at 1081 1.1 mrg run-time. 1082 1.1 mrg 1083 1.1 mrg <p>If <samp><span class="option">--disable-libgcj-bc</span></samp> is specified, libgcj is built without 1084 1.1 mrg these options. This allows the compile-time linker to resolve 1085 1.1 mrg dependencies when statically linking to libgcj. However it makes it 1086 1.1 mrg impossible to override the affected portions of libgcj at run-time. 1087 1.1 mrg 1088 1.1 mrg <br><dt><code>--enable-reduced-reflection</code><dd>Build most of libgcj with <samp><span class="option">-freduced-reflection</span></samp>. This reduces 1089 1.1 mrg the size of libgcj at the expense of not being able to do accurate 1090 1.1 mrg reflection on the classes it contains. This option is safe if you 1091 1.1 mrg know that code using libgcj will never use reflection on the standard 1092 1.1 mrg runtime classes in libgcj (including using serialization, RMI or CORBA). 1093 1.1 mrg 1094 1.1 mrg <br><dt><code>--with-ecos</code><dd>Enable runtime eCos target support. 1095 1.1 mrg 1096 1.1 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 1097 1.1 mrg support as well, as these require ‘<samp><span class="samp">libffi</span></samp>’ to work. 1098 1.1 mrg 1099 1.1 mrg <br><dt><code>--enable-libgcj-debug</code><dd>Enable runtime debugging code. 1100 1.1 mrg 1101 1.1 mrg <br><dt><code>--enable-libgcj-multifile</code><dd>If specified, causes all <samp><span class="file">.java</span></samp> source files to be 1102 1.1 mrg compiled into <samp><span class="file">.class</span></samp> files in one invocation of 1103 1.1 mrg ‘<samp><span class="samp">gcj</span></samp>’. This can speed up build time, but is more 1104 1.1 mrg resource-intensive. If this option is unspecified or 1105 1.1 mrg disabled, ‘<samp><span class="samp">gcj</span></samp>’ is invoked once for each <samp><span class="file">.java</span></samp> 1106 1.1 mrg file to compile into a <samp><span class="file">.class</span></samp> file. 1107 1.1 mrg 1108 1.1 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>. 1109 1.1 mrg 1110 1.1 mrg <br><dt><code>--enable-sjlj-exceptions</code><dd>Force use of the <code>setjmp</code>/<code>longjmp</code>-based scheme for exceptions. 1111 1.1 mrg ‘<samp><span class="samp">configure</span></samp>’ ordinarily picks the correct value based on the platform. 1112 1.1 mrg Only use this option if you are sure you need a different setting. 1113 1.1 mrg 1114 1.1 mrg <br><dt><code>--with-system-zlib</code><dd>Use installed ‘<samp><span class="samp">zlib</span></samp>’ rather than that included with GCC. 1115 1.1 mrg 1116 1.1 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 1117 1.1 mrg characters and the Win32 API. 1118 1.1 mrg 1119 1.1 mrg <br><dt><code>--enable-java-home</code><dd>If enabled, this creates a JPackage compatible SDK environment during install. 1120 1.1 mrg Note that if –enable-java-home is used, –with-arch-directory=ARCH must also 1121 1.1 mrg be specified. 1122 1.1 mrg 1123 1.1 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 1124 1.1 mrg environment created when –enable-java-home is passed. Typical names for this 1125 1.1 mrg directory include i386, amd64, ia64, etc. 1126 1.1 mrg 1127 1.1 mrg <br><dt><code>--with-os-directory=DIR</code><dd>Specifies the OS directory for the SDK include directory. This is set to auto 1128 1.1 mrg detect, and is typically 'linux'. 1129 1.1 mrg 1130 1.1 mrg <br><dt><code>--with-origin-name=NAME</code><dd>Specifies the JPackage origin name. This defaults to the 'gcj' in 1131 1.1 mrg java-1.5.0-gcj. 1132 1.1 mrg 1133 1.1 mrg <br><dt><code>--with-arch-suffix=SUFFIX</code><dd>Specifies the suffix for the sdk directory. Defaults to the empty string. 1134 1.1 mrg Examples include '.x86_64' in 'java-1.5.0-gcj-1.5.0.0.x86_64'. 1135 1.1 mrg 1136 1.1 mrg <br><dt><code>--with-jvm-root-dir=DIR</code><dd>Specifies where to install the SDK. Default is $(prefix)/lib/jvm. 1137 1.1 mrg 1138 1.1 mrg <br><dt><code>--with-jvm-jar-dir=DIR</code><dd>Specifies where to install jars. Default is $(prefix)/lib/jvm-exports. 1139 1.1 mrg 1140 1.1 mrg <br><dt><code>--with-python-dir=DIR</code><dd>Specifies where to install the Python modules used for aot-compile. DIR should 1141 1.1 mrg not include the prefix used in installation. For example, if the Python modules 1142 1.1 mrg are to be installed in /usr/lib/python2.5/site-packages, then 1143 1.1 mrg –with-python-dir=/lib/python2.5/site-packages should be passed. If this is 1144 1.1 mrg not specified, then the Python modules are installed in $(prefix)/share/python. 1145 1.1 mrg 1146 1.1 mrg <br><dt><code>--enable-aot-compile-rpm</code><dd>Adds aot-compile-rpm to the list of installed scripts. 1147 1.1 mrg 1148 1.1 mrg <br><dt><code>--enable-browser-plugin</code><dd>Build the gcjwebplugin web browser plugin. 1149 1.1 mrg 1150 1.1 mrg <dl> 1151 1.1 mrg <dt><code>ansi</code><dd>Use the single-byte <code>char</code> and the Win32 A functions natively, 1152 1.1 mrg translating to and from UNICODE when using these functions. If 1153 1.1 mrg unspecified, this is the default. 1154 1.1 mrg 1155 1.1 mrg <br><dt><code>unicows</code><dd>Use the <code>WCHAR</code> and Win32 W functions natively. Adds 1156 1.1 mrg <code>-lunicows</code> to <samp><span class="file">libgcj.spec</span></samp> to link with ‘<samp><span class="samp">libunicows</span></samp>’. 1157 1.1 mrg <samp><span class="file">unicows.dll</span></samp> needs to be deployed on Microsoft Windows 9X machines 1158 1.1 mrg running built executables. <samp><span class="file">libunicows.a</span></samp>, an open-source 1159 1.1 mrg import library around Microsoft's <code>unicows.dll</code>, is obtained from 1160 1.1 mrg <a href="http://libunicows.sourceforge.net/">http://libunicows.sourceforge.net/</a>, which also gives details 1161 1.1 mrg on getting <samp><span class="file">unicows.dll</span></samp> from Microsoft. 1162 1.1 mrg 1163 1.1 mrg <br><dt><code>unicode</code><dd>Use the <code>WCHAR</code> and Win32 W functions natively. Does <em>not</em> 1164 1.1 mrg add <code>-lunicows</code> to <samp><span class="file">libgcj.spec</span></samp>. The built executables will 1165 1.1 mrg only run on Microsoft Windows NT and above. 1166 1.1 mrg </dl> 1167 1.1 mrg </dl> 1168 1.1 mrg 1169 1.1 mrg <h5 class="subsubheading"><a name="TOC6"></a>AWT-Specific Options</h5> 1170 1.1 mrg 1171 1.1 mrg <dl> 1172 1.1 mrg <dt><code>--with-x</code><dd>Use the X Window System. 1173 1.1 mrg 1174 1.1 mrg <br><dt><code>--enable-java-awt=PEER(S)</code><dd>Specifies the AWT peer library or libraries to build alongside 1175 1.1 mrg ‘<samp><span class="samp">libgcj</span></samp>’. If this option is unspecified or disabled, AWT 1176 1.1 mrg will be non-functional. Current valid values are <samp><span class="option">gtk</span></samp> and 1177 1.1 mrg <samp><span class="option">xlib</span></samp>. Multiple libraries should be separated by a 1178 1.1 mrg comma (i.e. <samp><span class="option">--enable-java-awt=gtk,xlib</span></samp>). 1179 1.1 mrg 1180 1.1 mrg <br><dt><code>--enable-gtk-cairo</code><dd>Build the cairo Graphics2D implementation on GTK. 1181 1.1 mrg 1182 1.1 mrg <br><dt><code>--enable-java-gc=TYPE</code><dd>Choose garbage collector. Defaults to <samp><span class="option">boehm</span></samp> if unspecified. 1183 1.1 mrg 1184 1.1 mrg <br><dt><code>--disable-gtktest</code><dd>Do not try to compile and run a test GTK+ program. 1185 1.1 mrg 1186 1.1 mrg <br><dt><code>--disable-glibtest</code><dd>Do not try to compile and run a test GLIB program. 1187 1.1 mrg 1188 1.1 mrg <br><dt><code>--with-libart-prefix=PFX</code><dd>Prefix where libart is installed (optional). 1189 1.1 mrg 1190 1.1 mrg <br><dt><code>--with-libart-exec-prefix=PFX</code><dd>Exec prefix where libart is installed (optional). 1191 1.1 mrg 1192 1.1 mrg <br><dt><code>--disable-libarttest</code><dd>Do not try to compile and run a test libart program. 1193 1.1 mrg 1194 1.1 mrg </dl> 1195 1.1 mrg 1196 1.1 mrg <p><hr /> 1197 1.1 mrg <p><a href="./index.html">Return to the GCC Installation page</a> 1198 1.1 mrg 1199 1.1 mrg <!-- ***Building**************************************************************** --> 1200 1.1 mrg <!-- ***Testing***************************************************************** --> 1201 1.1 mrg <!-- ***Final install*********************************************************** --> 1202 1.1 mrg <!-- ***Binaries**************************************************************** --> 1203 1.1 mrg <!-- ***Specific**************************************************************** --> 1204 1.1 mrg <!-- ***Old documentation****************************************************** --> 1205 1.1 mrg <!-- ***GFDL******************************************************************** --> 1206 1.1 mrg <!-- *************************************************************************** --> 1207 1.1 mrg <!-- Part 6 The End of the Document --> 1208 1.1 mrg </body></html> 1209 1.1 mrg 1210
Indexes created Thu Jul 16 00:26:27 UTC 2026