configure.html revision 1.1.1.5
1 1.1.1.5 mrg <html lang="en"> 2 1.1.1.5 mrg <head> 3 1.1.1.5 mrg <title>Installing GCC: Configuration</title> 4 1.1.1.5 mrg <meta http-equiv="Content-Type" content="text/html"> 5 1.1.1.5 mrg <meta name="description" content="Installing GCC: Configuration"> 6 1.1.1.5 mrg <meta name="generator" content="makeinfo 4.12"> 7 1.1.1.5 mrg <link title="Top" rel="top" href="#Top"> 8 1.1.1.5 mrg <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> 9 1.1.1.5 mrg <!-- 10 1.1.1.5 mrg Copyright (C) 1988-2015 Free Software Foundation, Inc. 11 1.1 mrg 12 1.1.1.5 mrg Permission is granted to copy, distribute and/or modify this document 13 1.1.1.3 skrll under the terms of the GNU Free Documentation License, Version 1.3 or 14 1.1 mrg any later version published by the Free Software Foundation; with no 15 1.1 mrg Invariant Sections, the Front-Cover texts being (a) (see below), and 16 1.1 mrg with the Back-Cover Texts being (b) (see below). A copy of the 17 1.1.1.5 mrg license is included in the section entitled "GNU Free Documentation License". 18 1.1 mrg 19 1.1 mrg (a) The FSF's Front-Cover Text is: 20 1.1 mrg 21 1.1.1.5 mrg A GNU Manual 22 1.1 mrg 23 1.1 mrg (b) The FSF's Back-Cover Text is: 24 1.1 mrg 25 1.1.1.5 mrg You have freedom to copy and modify this GNU Manual, like GNU 26 1.1 mrg software. Copies published by the Free Software Foundation raise 27 1.1.1.5 mrg funds for GNU development.--> 28 1.1.1.5 mrg <meta http-equiv="Content-Style-Type" content="text/css"> 29 1.1.1.5 mrg <style type="text/css"><!-- 30 1.1.1.5 mrg pre.display { font-family:inherit } 31 1.1.1.5 mrg pre.format { font-family:inherit } 32 1.1.1.5 mrg pre.smalldisplay { font-family:inherit; font-size:smaller } 33 1.1.1.5 mrg pre.smallformat { font-family:inherit; font-size:smaller } 34 1.1.1.5 mrg pre.smallexample { font-size:smaller } 35 1.1.1.5 mrg pre.smalllisp { font-size:smaller } 36 1.1.1.5 mrg span.sc { font-variant:small-caps } 37 1.1.1.5 mrg span.roman { font-family:serif; font-weight:normal; } 38 1.1.1.5 mrg span.sansserif { font-family:sans-serif; font-weight:normal; } 39 1.1.1.5 mrg --></style> 40 1.1 mrg </head> 41 1.1.1.5 mrg <body> 42 1.1.1.5 mrg <h1 class="settitle">Installing GCC: Configuration</h1> 43 1.1.1.5 mrg <a name="index-Configuration-1"></a><a name="index-Installing-GCC_003a-Configuration-2"></a> 44 1.1.1.5 mrg Like most GNU software, GCC must be configured before it can be built. 45 1.1.1.4 mrg This document describes the recommended configuration procedure 46 1.1.1.4 mrg for both native and cross targets. 47 1.1.1.5 mrg 48 1.1.1.5 mrg <p>We use <var>srcdir</var> to refer to the toplevel source directory for 49 1.1.1.4 mrg GCC; we use <var>objdir</var> to refer to the toplevel build/object directory. 50 1.1.1.5 mrg 51 1.1.1.5 mrg <p>If you obtained the sources via SVN, <var>srcdir</var> must refer to the top 52 1.1.1.5 mrg <samp><span class="file">gcc</span></samp> directory, the one where the <samp><span class="file">MAINTAINERS</span></samp> file can be 53 1.1.1.5 mrg found, and not its <samp><span class="file">gcc</span></samp> subdirectory, otherwise the build will fail. 54 1.1.1.5 mrg 55 1.1.1.5 mrg <p>If either <var>srcdir</var> or <var>objdir</var> is located on an automounted NFS 56 1.1.1.5 mrg file system, the shell's built-in <samp><span class="command">pwd</span></samp> command will return 57 1.1 mrg temporary pathnames. Using these can lead to various sorts of build 58 1.1.1.5 mrg problems. To avoid this issue, set the <samp><span class="env">PWDCMD</span></samp> environment 59 1.1.1.5 mrg variable to an automounter-aware <samp><span class="command">pwd</span></samp> command, e.g., 60 1.1.1.5 mrg <samp><span class="command">pawd</span></samp> or ‘<samp><span class="samp">amq -w</span></samp>’, during the configuration and build 61 1.1 mrg phases. 62 1.1.1.5 mrg 63 1.1.1.5 mrg <p>First, we <strong>highly</strong> recommend that GCC be built into a 64 1.1 mrg separate directory from the sources which does <strong>not</strong> reside 65 1.1 mrg within the source tree. This is how we generally build GCC; building 66 1.1.1.5 mrg where <var>srcdir</var> == <var>objdir</var> should still work, but doesn't 67 1.1 mrg get extensive testing; building where <var>objdir</var> is a subdirectory 68 1.1 mrg of <var>srcdir</var> is unsupported. 69 1.1.1.5 mrg 70 1.1.1.5 mrg <p>If you have previously built GCC in the same directory for a 71 1.1.1.5 mrg different target machine, do ‘<samp><span class="samp">make distclean</span></samp>’ to delete all files 72 1.1.1.5 mrg that might be invalid. One of the files this deletes is <samp><span class="file">Makefile</span></samp>; 73 1.1.1.5 mrg if ‘<samp><span class="samp">make distclean</span></samp>’ complains that <samp><span class="file">Makefile</span></samp> does not exist 74 1.1.1.5 mrg or issues a message like “don't know how to make distclean” it probably 75 1.1 mrg means that the directory is already suitably clean. However, with the 76 1.1 mrg recommended method of building in a separate <var>objdir</var>, you should 77 1.1 mrg simply use a different <var>objdir</var> for each target. 78 1.1.1.5 mrg 79 1.1.1.5 mrg <p>Second, when configuring a native system, either <samp><span class="command">cc</span></samp> or 80 1.1.1.5 mrg <samp><span class="command">gcc</span></samp> must be in your path or you must set <samp><span class="env">CC</span></samp> in 81 1.1 mrg your environment before running configure. Otherwise the configuration 82 1.1 mrg scripts may fail. 83 1.1 mrg 84 1.1.1.5 mrg <p>To configure GCC: 85 1.1 mrg 86 1.1.1.5 mrg <pre class="smallexample"> % mkdir <var>objdir</var> 87 1.1.1.5 mrg % cd <var>objdir</var> 88 1.1.1.5 mrg % <var>srcdir</var>/configure [<var>options</var>] [<var>target</var>] 89 1.1.1.5 mrg </pre> 90 1.1.1.5 mrg <h3 class="heading"><a name="TOC0"></a>Distributor options</h3> 91 1.1 mrg 92 1.1 mrg <p>If you will be distributing binary versions of GCC, with modifications 93 1.1 mrg to the source code, you should use the options described in this 94 1.1 mrg section to make clear that your version contains modifications. 95 1.1.1.5 mrg 96 1.1.1.5 mrg <dl> 97 1.1.1.5 mrg <dt><code>--with-pkgversion=</code><var>version</var><dd>Specify a string that identifies your package. You may wish 98 1.1 mrg to include a build number or build date. This version string will be 99 1.1.1.5 mrg included in the output of <samp><span class="command">gcc --version</span></samp>. This suffix does 100 1.1.1.5 mrg not replace the default version string, only the ‘<samp><span class="samp">GCC</span></samp>’ part. 101 1.1.1.5 mrg 102 1.1.1.5 mrg <p>The default value is ‘<samp><span class="samp">GCC</span></samp>’. 103 1.1.1.5 mrg 104 1.1.1.5 mrg <br><dt><code>--with-bugurl=</code><var>url</var><dd>Specify the URL that users should visit if they wish to report a bug. 105 1.1 mrg You are of course welcome to forward bugs reported to you to the FSF, 106 1.1 mrg if you determine that they are not bugs in your modifications. 107 1.1 mrg 108 1.1.1.5 mrg <p>The default value refers to the FSF's GCC bug tracker. 109 1.1.1.5 mrg 110 1.1.1.5 mrg </dl> 111 1.1.1.5 mrg 112 1.1.1.5 mrg <h3 class="heading"><a name="TOC1"></a>Target specification</h3> 113 1.1.1.5 mrg 114 1.1.1.5 mrg <ul> 115 1.1.1.5 mrg <li>GCC has code to correctly determine the correct value for <var>target</var> 116 1.1 mrg for nearly all native systems. Therefore, we highly recommend you do 117 1.1 mrg not provide a configure target when configuring a native compiler. 118 1.1 mrg 119 1.1.1.5 mrg <li><var>target</var> must be specified as <samp><span class="option">--target=</span><var>target</var></samp> 120 1.1 mrg when configuring a cross compiler; examples of valid targets would be 121 1.1 mrg m68k-elf, sh-elf, etc. 122 1.1 mrg 123 1.1.1.5 mrg <li>Specifying just <var>target</var> instead of <samp><span class="option">--target=</span><var>target</var></samp> 124 1.1.1.5 mrg implies that the host defaults to <var>target</var>. 125 1.1.1.5 mrg </ul> 126 1.1 mrg 127 1.1.1.5 mrg <h3 class="heading"><a name="TOC2"></a>Options specification</h3> 128 1.1 mrg 129 1.1 mrg <p>Use <var>options</var> to override several configure time options for 130 1.1.1.5 mrg GCC. A list of supported <var>options</var> follows; ‘<samp><span class="samp">configure 131 1.1.1.5 mrg --help</span></samp>’ may list other options, but those not listed below may not 132 1.1 mrg work and should not normally be used. 133 1.1.1.5 mrg 134 1.1.1.5 mrg <p>Note that each <samp><span class="option">--enable</span></samp> option has a corresponding 135 1.1.1.5 mrg <samp><span class="option">--disable</span></samp> option and that each <samp><span class="option">--with</span></samp> option has a 136 1.1.1.5 mrg corresponding <samp><span class="option">--without</span></samp> option. 137 1.1.1.5 mrg 138 1.1.1.5 mrg <dl> 139 1.1.1.5 mrg <dt><code>--prefix=</code><var>dirname</var><dd>Specify the toplevel installation 140 1.1 mrg directory. This is the recommended way to install the tools into a directory 141 1.1 mrg other than the default. The toplevel installation directory defaults to 142 1.1.1.5 mrg <samp><span class="file">/usr/local</span></samp>. 143 1.1.1.5 mrg 144 1.1.1.5 mrg <p>We <strong>highly</strong> recommend against <var>dirname</var> being the same or a 145 1.1 mrg subdirectory of <var>objdir</var> or vice versa. If specifying a directory 146 1.1.1.5 mrg beneath a user's home directory tree, some shells will not expand 147 1.1.1.5 mrg <var>dirname</var> correctly if it contains the ‘<samp><span class="samp">~</span></samp>’ metacharacter; use 148 1.1.1.5 mrg <samp><span class="env">$HOME</span></samp> instead. 149 1.1.1.5 mrg 150 1.1.1.5 mrg <p>The following standard <samp><span class="command">autoconf</span></samp> options are supported. Normally you 151 1.1 mrg should not need to use these options. 152 1.1.1.5 mrg <dl> 153 1.1.1.5 mrg <dt><code>--exec-prefix=</code><var>dirname</var><dd>Specify the toplevel installation directory for architecture-dependent 154 1.1 mrg files. The default is <samp><var>prefix</var></samp>. 155 1.1.1.5 mrg 156 1.1.1.5 mrg <br><dt><code>--bindir=</code><var>dirname</var><dd>Specify the installation directory for the executables called by users 157 1.1.1.5 mrg (such as <samp><span class="command">gcc</span></samp> and <samp><span class="command">g++</span></samp>). The default is 158 1.1.1.5 mrg <samp><var>exec-prefix</var><span class="file">/bin</span></samp>. 159 1.1.1.5 mrg 160 1.1.1.5 mrg <br><dt><code>--libdir=</code><var>dirname</var><dd>Specify the installation directory for object code libraries and 161 1.1.1.5 mrg internal data files of GCC. The default is <samp><var>exec-prefix</var><span class="file">/lib</span></samp>. 162 1.1.1.5 mrg 163 1.1.1.5 mrg <br><dt><code>--libexecdir=</code><var>dirname</var><dd>Specify the installation directory for internal executables of GCC. 164 1.1.1.5 mrg The default is <samp><var>exec-prefix</var><span class="file">/libexec</span></samp>. 165 1.1.1.5 mrg 166 1.1.1.5 mrg <br><dt><code>--with-slibdir=</code><var>dirname</var><dd>Specify the installation directory for the shared libgcc library. The 167 1.1 mrg default is <samp><var>libdir</var></samp>. 168 1.1.1.5 mrg 169 1.1.1.5 mrg <br><dt><code>--datarootdir=</code><var>dirname</var><dd>Specify the root of the directory tree for read-only architecture-independent 170 1.1.1.5 mrg data files referenced by GCC. The default is <samp><var>prefix</var><span class="file">/share</span></samp>. 171 1.1.1.5 mrg 172 1.1.1.5 mrg <br><dt><code>--infodir=</code><var>dirname</var><dd>Specify the installation directory for documentation in info format. 173 1.1.1.5 mrg The default is <samp><var>datarootdir</var><span class="file">/info</span></samp>. 174 1.1.1.5 mrg 175 1.1.1.5 mrg <br><dt><code>--datadir=</code><var>dirname</var><dd>Specify the installation directory for some architecture-independent 176 1.1 mrg data files referenced by GCC. The default is <samp><var>datarootdir</var></samp>. 177 1.1.1.5 mrg 178 1.1.1.5 mrg <br><dt><code>--docdir=</code><var>dirname</var><dd>Specify the installation directory for documentation files (other 179 1.1.1.5 mrg than Info) for GCC. The default is <samp><var>datarootdir</var><span class="file">/doc</span></samp>. 180 1.1.1.5 mrg 181 1.1.1.5 mrg <br><dt><code>--htmldir=</code><var>dirname</var><dd>Specify the installation directory for HTML documentation files. 182 1.1 mrg The default is <samp><var>docdir</var></samp>. 183 1.1.1.5 mrg 184 1.1.1.5 mrg <br><dt><code>--pdfdir=</code><var>dirname</var><dd>Specify the installation directory for PDF documentation files. 185 1.1 mrg The default is <samp><var>docdir</var></samp>. 186 1.1.1.5 mrg 187 1.1.1.5 mrg <br><dt><code>--mandir=</code><var>dirname</var><dd>Specify the installation directory for manual pages. The default is 188 1.1.1.5 mrg <samp><var>datarootdir</var><span class="file">/man</span></samp>. (Note that the manual pages are only extracts 189 1.1 mrg from the full GCC manuals, which are provided in Texinfo format. The manpages 190 1.1 mrg are derived by an automatic conversion process from parts of the full 191 1.1 mrg manual.) 192 1.1.1.5 mrg 193 1.1.1.5 mrg <br><dt><code>--with-gxx-include-dir=</code><var>dirname</var><dd>Specify 194 1.1 mrg the installation directory for G++ header files. The default depends 195 1.1 mrg on other configuration options, and differs between cross and native 196 1.1 mrg configurations. 197 1.1.1.5 mrg 198 1.1.1.5 mrg <br><dt><code>--with-specs=</code><var>specs</var><dd>Specify additional command line driver SPECS. 199 1.1.1.3 skrll This can be useful if you need to turn on a non-standard feature by 200 1.1.1.5 mrg default without modifying the compiler's source code, for instance 201 1.1.1.5 mrg <samp><span class="option">--with-specs=%{!fcommon:%{!fno-common:-fno-common}}</span></samp>. 202 1.1.1.3 skrll See “Spec Files” in the main manual 203 1.1.1.3 skrll 204 1.1.1.5 mrg </dl> 205 1.1.1.5 mrg 206 1.1.1.5 mrg <br><dt><code>--program-prefix=</code><var>prefix</var><dd>GCC supports some transformations of the names of its programs when 207 1.1 mrg installing them. This option prepends <var>prefix</var> to the names of 208 1.1 mrg programs to install in <var>bindir</var> (see above). For example, specifying 209 1.1.1.5 mrg <samp><span class="option">--program-prefix=foo-</span></samp> would result in ‘<samp><span class="samp">gcc</span></samp>’ 210 1.1.1.5 mrg being installed as <samp><span class="file">/usr/local/bin/foo-gcc</span></samp>. 211 1.1.1.5 mrg 212 1.1.1.5 mrg <br><dt><code>--program-suffix=</code><var>suffix</var><dd>Appends <var>suffix</var> to the names of programs to install in <var>bindir</var> 213 1.1.1.5 mrg (see above). For example, specifying <samp><span class="option">--program-suffix=-3.1</span></samp> 214 1.1.1.5 mrg would result in ‘<samp><span class="samp">gcc</span></samp>’ being installed as 215 1.1.1.5 mrg <samp><span class="file">/usr/local/bin/gcc-3.1</span></samp>. 216 1.1.1.5 mrg 217 1.1.1.5 mrg <br><dt><code>--program-transform-name=</code><var>pattern</var><dd>Applies the ‘<samp><span class="samp">sed</span></samp>’ script <var>pattern</var> to be applied to the names 218 1.1 mrg of programs to install in <var>bindir</var> (see above). <var>pattern</var> has to 219 1.1.1.5 mrg consist of one or more basic ‘<samp><span class="samp">sed</span></samp>’ editing commands, separated by 220 1.1.1.5 mrg semicolons. For example, if you want the ‘<samp><span class="samp">gcc</span></samp>’ program name to be 221 1.1.1.5 mrg transformed to the installed program <samp><span class="file">/usr/local/bin/myowngcc</span></samp> and 222 1.1.1.5 mrg the ‘<samp><span class="samp">g++</span></samp>’ program name to be transformed to 223 1.1.1.5 mrg <samp><span class="file">/usr/local/bin/gspecial++</span></samp> without changing other program names, 224 1.1 mrg you could use the pattern 225 1.1.1.5 mrg <samp><span class="option">--program-transform-name='s/^gcc$/myowngcc/; s/^g++$/gspecial++/'</span></samp> 226 1.1 mrg to achieve this effect. 227 1.1.1.5 mrg 228 1.1.1.5 mrg <p>All three options can be combined and used together, resulting in more 229 1.1 mrg complex conversion patterns. As a basic rule, <var>prefix</var> (and 230 1.1 mrg <var>suffix</var>) are prepended (appended) before further transformations 231 1.1 mrg can happen with a special transformation script <var>pattern</var>. 232 1.1.1.5 mrg 233 1.1.1.5 mrg <p>As currently implemented, this option only takes effect for native 234 1.1.1.5 mrg builds; cross compiler binaries' names are not transformed even when a 235 1.1 mrg transformation is explicitly asked for by one of these options. 236 1.1.1.5 mrg 237 1.1.1.5 mrg <p>For native builds, some of the installed programs are also installed 238 1.1 mrg with the target alias in front of their name, as in 239 1.1.1.5 mrg ‘<samp><span class="samp">i686-pc-linux-gnu-gcc</span></samp>’. All of the above transformations happen 240 1.1 mrg before the target alias is prepended to the name—so, specifying 241 1.1.1.5 mrg <samp><span class="option">--program-prefix=foo-</span></samp> and <samp><span class="option">program-suffix=-3.1</span></samp>, the 242 1.1 mrg resulting binary would be installed as 243 1.1.1.5 mrg <samp><span class="file">/usr/local/bin/i686-pc-linux-gnu-foo-gcc-3.1</span></samp>. 244 1.1.1.5 mrg 245 1.1.1.5 mrg <p>As a last shortcoming, none of the installed Ada programs are 246 1.1 mrg transformed yet, which will be fixed in some time. 247 1.1.1.5 mrg 248 1.1.1.5 mrg <br><dt><code>--with-local-prefix=</code><var>dirname</var><dd>Specify the 249 1.1 mrg installation directory for local include files. The default is 250 1.1.1.5 mrg <samp><span class="file">/usr/local</span></samp>. Specify this option if you want the compiler to 251 1.1.1.5 mrg search directory <samp><var>dirname</var><span class="file">/include</span></samp> for locally installed 252 1.1.1.5 mrg header files <em>instead</em> of <samp><span class="file">/usr/local/include</span></samp>. 253 1.1.1.5 mrg 254 1.1.1.5 mrg <p>You should specify <samp><span class="option">--with-local-prefix</span></samp> <strong>only</strong> if your 255 1.1.1.5 mrg site has a different convention (not <samp><span class="file">/usr/local</span></samp>) for where to put 256 1.1 mrg site-specific files. 257 1.1.1.5 mrg 258 1.1.1.5 mrg <p>The default value for <samp><span class="option">--with-local-prefix</span></samp> is <samp><span class="file">/usr/local</span></samp> 259 1.1.1.5 mrg regardless of the value of <samp><span class="option">--prefix</span></samp>. Specifying 260 1.1.1.5 mrg <samp><span class="option">--prefix</span></samp> has no effect on which directory GCC searches for 261 1.1 mrg local header files. This may seem counterintuitive, but actually it is 262 1.1 mrg logical. 263 1.1.1.5 mrg 264 1.1.1.5 mrg <p>The purpose of <samp><span class="option">--prefix</span></samp> is to specify where to <em>install 265 1.1.1.5 mrg GCC</em>. The local header files in <samp><span class="file">/usr/local/include</span></samp>—if you put 266 1.1 mrg any in that directory—are not part of GCC. They are part of other 267 1.1 mrg programs—perhaps many others. (GCC installs its own header files in 268 1.1.1.5 mrg another directory which is based on the <samp><span class="option">--prefix</span></samp> value.) 269 1.1.1.5 mrg 270 1.1.1.5 mrg <p>Both the local-prefix include directory and the GCC-prefix include 271 1.1.1.5 mrg directory are part of GCC's “system include” directories. Although these 272 1.1 mrg two directories are not fixed, they need to be searched in the proper 273 1.1 mrg order for the correct processing of the include_next directive. The 274 1.1 mrg local-prefix include directory is searched before the GCC-prefix 275 1.1 mrg include directory. Another characteristic of system include directories 276 1.1 mrg is that pedantic warnings are turned off for headers in these directories. 277 1.1.1.5 mrg 278 1.1.1.5 mrg <p>Some autoconf macros add <samp><span class="option">-I </span><var>directory</var></samp> options to the 279 1.1 mrg compiler command line, to ensure that directories containing installed 280 1.1.1.5 mrg packages' headers are searched. When <var>directory</var> is one of GCC's 281 1.1 mrg system include directories, GCC will ignore the option so that system 282 1.1 mrg directories continue to be processed in the correct order. This 283 1.1 mrg may result in a search order different from what was specified but the 284 1.1 mrg directory will still be searched. 285 1.1.1.5 mrg 286 1.1.1.5 mrg <p>GCC automatically searches for ordinary libraries using 287 1.1.1.5 mrg <samp><span class="env">GCC_EXEC_PREFIX</span></samp>. Thus, when the same installation prefix is 288 1.1 mrg used for both GCC and packages, GCC will automatically search for 289 1.1 mrg both headers and libraries. This provides a configuration that is 290 1.1 mrg easy to use. GCC behaves in a manner similar to that when it is 291 1.1.1.5 mrg installed as a system compiler in <samp><span class="file">/usr</span></samp>. 292 1.1.1.5 mrg 293 1.1.1.5 mrg <p>Sites that need to install multiple versions of GCC may not want to 294 1.1 mrg use the above simple configuration. It is possible to use the 295 1.1.1.5 mrg <samp><span class="option">--program-prefix</span></samp>, <samp><span class="option">--program-suffix</span></samp> and 296 1.1.1.5 mrg <samp><span class="option">--program-transform-name</span></samp> options to install multiple versions 297 1.1 mrg into a single directory, but it may be simpler to use different prefixes 298 1.1.1.5 mrg and the <samp><span class="option">--with-local-prefix</span></samp> option to specify the location of the 299 1.1 mrg site-specific files for each version. It will then be necessary for 300 1.1 mrg users to specify explicitly the location of local site libraries 301 1.1.1.5 mrg (e.g., with <samp><span class="env">LIBRARY_PATH</span></samp>). 302 1.1.1.5 mrg 303 1.1.1.5 mrg <p>The same value can be used for both <samp><span class="option">--with-local-prefix</span></samp> and 304 1.1.1.5 mrg <samp><span class="option">--prefix</span></samp> provided it is not <samp><span class="file">/usr</span></samp>. This can be used 305 1.1.1.5 mrg to avoid the default search of <samp><span class="file">/usr/local/include</span></samp>. 306 1.1.1.5 mrg 307 1.1.1.5 mrg <p><strong>Do not</strong> specify <samp><span class="file">/usr</span></samp> as the <samp><span class="option">--with-local-prefix</span></samp>! 308 1.1.1.5 mrg The directory you use for <samp><span class="option">--with-local-prefix</span></samp> <strong>must not</strong> 309 1.1.1.5 mrg contain any of the system's standard header files. If it did contain 310 1.1 mrg them, certain programs would be miscompiled (including GNU Emacs, on 311 1.1 mrg certain targets), because this would override and nullify the header 312 1.1.1.5 mrg file corrections made by the <samp><span class="command">fixincludes</span></samp> script. 313 1.1.1.5 mrg 314 1.1.1.5 mrg <p>Indications are that people who use this option use it based on mistaken 315 1.1 mrg ideas of what it is for. People use it as if it specified where to 316 1.1 mrg install part of GCC. Perhaps they make this assumption because 317 1.1 mrg installing GCC creates the directory. 318 1.1.1.5 mrg 319 1.1.1.5 mrg <br><dt><code>--with-native-system-header-dir=</code><var>dirname</var><dd>Specifies that <var>dirname</var> is the directory that contains native system 320 1.1.1.5 mrg header files, rather than <samp><span class="file">/usr/include</span></samp>. This option is most useful 321 1.1.1.3 skrll if you are creating a compiler that should be isolated from the system 322 1.1.1.3 skrll as much as possible. It is most commonly used with the 323 1.1.1.5 mrg <samp><span class="option">--with-sysroot</span></samp> option and will cause GCC to search 324 1.1.1.3 skrll <var>dirname</var> inside the system root specified by that option. 325 1.1.1.5 mrg 326 1.1.1.5 mrg <br><dt><code>--enable-shared[=</code><var>package</var><code>[,...]]</code><dd>Build shared versions of libraries, if shared libraries are supported on 327 1.1 mrg the target platform. Unlike GCC 2.95.x and earlier, shared libraries 328 1.1 mrg are enabled by default on all platforms that support shared libraries. 329 1.1.1.5 mrg 330 1.1.1.5 mrg <p>If a list of packages is given as an argument, build shared libraries 331 1.1 mrg only for the listed packages. For other packages, only static libraries 332 1.1 mrg will be built. Package names currently recognized in the GCC tree are 333 1.1.1.5 mrg ‘<samp><span class="samp">libgcc</span></samp>’ (also known as ‘<samp><span class="samp">gcc</span></samp>’), ‘<samp><span class="samp">libstdc++</span></samp>’ (not 334 1.1.1.5 mrg ‘<samp><span class="samp">libstdc++-v3</span></samp>’), ‘<samp><span class="samp">libffi</span></samp>’, ‘<samp><span class="samp">zlib</span></samp>’, ‘<samp><span class="samp">boehm-gc</span></samp>’, 335 1.1.1.5 mrg ‘<samp><span class="samp">ada</span></samp>’, ‘<samp><span class="samp">libada</span></samp>’, ‘<samp><span class="samp">libjava</span></samp>’, ‘<samp><span class="samp">libgo</span></samp>’, and ‘<samp><span class="samp">libobjc</span></samp>’. 336 1.1.1.5 mrg Note ‘<samp><span class="samp">libiberty</span></samp>’ does not support shared libraries at all. 337 1.1.1.5 mrg 338 1.1.1.5 mrg <p>Use <samp><span class="option">--disable-shared</span></samp> to build only static libraries. Note that 339 1.1.1.5 mrg <samp><span class="option">--disable-shared</span></samp> does not accept a list of package names as 340 1.1.1.5 mrg argument, only <samp><span class="option">--enable-shared</span></samp> does. 341 1.1.1.5 mrg 342 1.1.1.5 mrg <br><dt><code><a name="with_002dgnu_002das"></a>--with-gnu-as</code><dd>Specify that the compiler should assume that the 343 1.1 mrg assembler it finds is the GNU assembler. However, this does not modify 344 1.1 mrg the rules to find an assembler and will result in confusion if the 345 1.1 mrg assembler found is not actually the GNU assembler. (Confusion may also 346 1.1 mrg result if the compiler finds the GNU assembler but has not been 347 1.1.1.5 mrg configured with <samp><span class="option">--with-gnu-as</span></samp>.) If you have more than one 348 1.1 mrg assembler installed on your system, you may want to use this option in 349 1.1.1.5 mrg connection with <samp><span class="option">--with-as=</span><var>pathname</var></samp> or 350 1.1.1.5 mrg <samp><span class="option">--with-build-time-tools=</span><var>pathname</var></samp>. 351 1.1.1.5 mrg 352 1.1.1.5 mrg <p>The following systems are the only ones where it makes a difference 353 1.1 mrg whether you use the GNU assembler. On any other system, 354 1.1.1.5 mrg <samp><span class="option">--with-gnu-as</span></samp> has no effect. 355 1.1.1.5 mrg 356 1.1.1.5 mrg <ul> 357 1.1.1.5 mrg <li>‘<samp><span class="samp">hppa1.0-</span><var>any</var><span class="samp">-</span><var>any</var></samp>’ 358 1.1.1.5 mrg <li>‘<samp><span class="samp">hppa1.1-</span><var>any</var><span class="samp">-</span><var>any</var></samp>’ 359 1.1.1.5 mrg <li>‘<samp><span class="samp">sparc-sun-solaris2.</span><var>any</var></samp>’ 360 1.1.1.5 mrg <li>‘<samp><span class="samp">sparc64-</span><var>any</var><span class="samp">-solaris2.</span><var>any</var></samp>’ 361 1.1.1.5 mrg </ul> 362 1.1.1.5 mrg 363 1.1.1.5 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 364 1.1 mrg <var>pathname</var>, rather than the one found by the standard rules to find 365 1.1 mrg an assembler, which are: 366 1.1.1.5 mrg <ul> 367 1.1.1.5 mrg <li>Unless GCC is being built with a cross compiler, check the 368 1.1.1.5 mrg <samp><var>libexec</var><span class="file">/gcc/</span><var>target</var><span class="file">/</span><var>version</var></samp> directory. 369 1.1.1.5 mrg <var>libexec</var> defaults to <samp><var>exec-prefix</var><span class="file">/libexec</span></samp>; 370 1.1 mrg <var>exec-prefix</var> defaults to <var>prefix</var>, which 371 1.1.1.5 mrg defaults to <samp><span class="file">/usr/local</span></samp> unless overridden by the 372 1.1.1.5 mrg <samp><span class="option">--prefix=</span><var>pathname</var></samp> switch described above. <var>target</var> 373 1.1.1.5 mrg is the target system triple, such as ‘<samp><span class="samp">sparc-sun-solaris2.7</span></samp>’, and 374 1.1 mrg <var>version</var> denotes the GCC version, such as 3.0. 375 1.1 mrg 376 1.1.1.5 mrg <li>If the target system is the same that you are building on, check 377 1.1.1.5 mrg operating system specific directories (e.g. <samp><span class="file">/usr/ccs/bin</span></samp> on 378 1.1 mrg Sun Solaris 2). 379 1.1 mrg 380 1.1.1.5 mrg <li>Check in the <samp><span class="env">PATH</span></samp> for a tool whose name is prefixed by the 381 1.1 mrg target system triple. 382 1.1 mrg 383 1.1.1.5 mrg <li>Check in the <samp><span class="env">PATH</span></samp> for a tool whose name is not prefixed by the 384 1.1 mrg target system triple, if the host and target system triple are 385 1.1 mrg the same (in other words, we use a host tool if it can be used for 386 1.1.1.5 mrg the target as well). 387 1.1.1.5 mrg </ul> 388 1.1 mrg 389 1.1.1.5 mrg <p>You may want to use <samp><span class="option">--with-as</span></samp> if no assembler 390 1.1 mrg is installed in the directories listed above, or if you have multiple 391 1.1 mrg assemblers installed and want to choose one that is not found by the 392 1.1 mrg above rules. 393 1.1.1.5 mrg 394 1.1.1.5 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> 395 1.1 mrg but for the linker. 396 1.1.1.5 mrg 397 1.1.1.5 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> 398 1.1 mrg but for the linker. 399 1.1.1.5 mrg 400 1.1.1.5 mrg <br><dt><code>--with-stabs</code><dd>Specify that stabs debugging 401 1.1 mrg information should be used instead of whatever format the host normally 402 1.1 mrg uses. Normally GCC uses the same debug format as the host system. 403 1.1.1.5 mrg 404 1.1.1.5 mrg <p>On MIPS based systems and on Alphas, you must specify whether you want 405 1.1 mrg GCC to create the normal ECOFF debugging format, or to use BSD-style 406 1.1 mrg stabs passed through the ECOFF symbol table. The normal ECOFF debug 407 1.1 mrg format cannot fully handle languages other than C. BSD stabs format can 408 1.1 mrg handle other languages, but it only works with the GNU debugger GDB. 409 1.1.1.5 mrg 410 1.1.1.5 mrg <p>Normally, GCC uses the ECOFF debugging format by default; if you 411 1.1.1.5 mrg prefer BSD stabs, specify <samp><span class="option">--with-stabs</span></samp> when you configure GCC. 412 1.1.1.5 mrg 413 1.1.1.5 mrg <p>No matter which default you choose when you configure GCC, the user 414 1.1.1.5 mrg can use the <samp><span class="option">-gcoff</span></samp> and <samp><span class="option">-gstabs+</span></samp> options to specify explicitly 415 1.1 mrg the debug format for a particular compilation. 416 1.1.1.5 mrg 417 1.1.1.5 mrg <p><samp><span class="option">--with-stabs</span></samp> is meaningful on the ISC system on the 386, also, if 418 1.1.1.5 mrg <samp><span class="option">--with-gas</span></samp> is used. It selects use of stabs debugging 419 1.1 mrg information embedded in COFF output. This kind of debugging information 420 1.1 mrg supports C++ well; ordinary COFF debugging information does not. 421 1.1.1.5 mrg 422 1.1.1.5 mrg <p><samp><span class="option">--with-stabs</span></samp> is also meaningful on 386 systems running SVR4. It 423 1.1 mrg selects use of stabs debugging information embedded in ELF output. The 424 1.1 mrg C++ compiler currently (2.6.0) does not support the DWARF debugging 425 1.1 mrg information normally used on 386 SVR4 platforms; stabs provide a 426 1.1 mrg workable alternative. This requires gas and gdb, as the normal SVR4 427 1.1 mrg tools can not generate or interpret stabs. 428 1.1.1.5 mrg 429 1.1.1.5 mrg <br><dt><code>--with-tls=</code><var>dialect</var><dd>Specify the default TLS dialect, for systems were there is a choice. 430 1.1.1.3 skrll For ARM targets, possible values for <var>dialect</var> are <code>gnu</code> or 431 1.1.1.3 skrll <code>gnu2</code>, which select between the original GNU dialect and the GNU TLS 432 1.1.1.3 skrll descriptor-based dialect. 433 1.1.1.5 mrg 434 1.1.1.5 mrg <br><dt><code>--enable-multiarch</code><dd>Specify whether to enable or disable multiarch support. The default is 435 1.1.1.3 skrll to check for glibc start files in a multiarch location, and enable it 436 1.1.1.3 skrll if the files are found. The auto detection is enabled for native builds, 437 1.1.1.5 mrg and for cross builds configured with <samp><span class="option">--with-sysroot</span></samp>, and without 438 1.1.1.5 mrg <samp><span class="option">--with-native-system-header-dir</span></samp>. 439 1.1.1.3 skrll More documentation about multiarch can be found at 440 1.1.1.3 skrll <a href="http://wiki.debian.org/Multiarch">http://wiki.debian.org/Multiarch</a>. 441 1.1.1.5 mrg 442 1.1.1.5 mrg <br><dt><code>--disable-multilib</code><dd>Specify that multiple target 443 1.1 mrg libraries to support different target variants, calling 444 1.1 mrg conventions, etc. should not be built. The default is to build a 445 1.1 mrg predefined set of them. 446 1.1.1.5 mrg 447 1.1.1.5 mrg <p>Some targets provide finer-grained control over which multilibs are built 448 1.1.1.5 mrg (e.g., <samp><span class="option">--disable-softfloat</span></samp>): 449 1.1.1.5 mrg <dl> 450 1.1.1.5 mrg <dt><code>arm-*-*</code><dd>fpu, 26bit, underscore, interwork, biendian, nofmult. 451 1.1.1.5 mrg 452 1.1.1.5 mrg <br><dt><code>m68*-*-*</code><dd>softfloat, m68881, m68000, m68020. 453 1.1.1.5 mrg 454 1.1.1.5 mrg <br><dt><code>mips*-*-*</code><dd>single-float, biendian, softfloat. 455 1.1.1.5 mrg 456 1.1.1.5 mrg <br><dt><code>powerpc*-*-*, rs6000*-*-*</code><dd>aix64, pthread, softfloat, powercpu, powerpccpu, powerpcos, biendian, 457 1.1 mrg sysv, aix. 458 1.1 mrg 459 1.1.1.5 mrg </dl> 460 1.1.1.5 mrg 461 1.1.1.5 mrg <br><dt><code>--with-multilib-list=</code><var>list</var><dt><code>--without-multilib-list</code><dd>Specify what multilibs to build. 462 1.1.1.3 skrll Currently only implemented for sh*-*-* and x86-64-*-linux*. 463 1.1.1.5 mrg 464 1.1.1.5 mrg <dl> 465 1.1.1.5 mrg <dt><code>sh*-*-*</code><dd><var>list</var> is a comma separated list of CPU names. These must be of the 466 1.1 mrg form <code>sh*</code> or <code>m*</code> (in which case they match the compiler option 467 1.1 mrg for that processor). The list should not contain any endian options - 468 1.1.1.5 mrg these are handled by <samp><span class="option">--with-endian</span></samp>. 469 1.1.1.5 mrg 470 1.1.1.5 mrg <p>If <var>list</var> is empty, then there will be no multilibs for extra 471 1.1 mrg processors. The multilib for the secondary endian remains enabled. 472 1.1.1.5 mrg 473 1.1.1.5 mrg <p>As a special case, if an entry in the list starts with a <code>!</code> 474 1.1.1.5 mrg (exclamation point), then it is added to the list of excluded multilibs. 475 1.1.1.5 mrg Entries of this sort should be compatible with ‘<samp><span class="samp">MULTILIB_EXCLUDES</span></samp>’ 476 1.1 mrg (once the leading <code>!</code> has been stripped). 477 1.1.1.5 mrg 478 1.1.1.5 mrg <p>If <samp><span class="option">--with-multilib-list</span></samp> is not given, then a default set of 479 1.1.1.5 mrg multilibs is selected based on the value of <samp><span class="option">--target</span></samp>. This is 480 1.1 mrg usually the complete set of libraries, but some targets imply a more 481 1.1 mrg specialized subset. 482 1.1.1.4 mrg 483 1.1.1.5 mrg <p>Example 1: to configure a compiler for SH4A only, but supporting both 484 1.1.1.5 mrg endians, with little endian being the default: 485 1.1.1.5 mrg <pre class="smallexample"> --with-cpu=sh4a --with-endian=little,big --with-multilib-list= 486 1.1.1.5 mrg </pre> 487 1.1.1.5 mrg <p>Example 2: to configure a compiler for both SH4A and SH4AL-DSP, but with 488 1.1 mrg only little endian SH4AL: 489 1.1.1.5 mrg <pre class="smallexample"> --with-cpu=sh4a --with-endian=little,big \ 490 1.1.1.5 mrg --with-multilib-list=sh4al,!mb/m4al 491 1.1.1.5 mrg </pre> 492 1.1.1.5 mrg <br><dt><code>x86-64-*-linux*</code><dd><var>list</var> is a comma separated list of <code>m32</code>, <code>m64</code> and 493 1.1.1.3 skrll <code>mx32</code> to enable 32-bit, 64-bit and x32 run-time libraries, 494 1.1.1.3 skrll respectively. If <var>list</var> is empty, then there will be no multilibs 495 1.1.1.3 skrll and only the default run-time library will be enabled. 496 1.1.1.5 mrg 497 1.1.1.5 mrg <p>If <samp><span class="option">--with-multilib-list</span></samp> is not given, then only 32-bit and 498 1.1.1.5 mrg 64-bit run-time libraries will be enabled. 499 1.1.1.3 skrll </dl> 500 1.1.1.3 skrll 501 1.1.1.5 mrg <br><dt><code>--with-endian=</code><var>endians</var><dd>Specify what endians to use. 502 1.1 mrg Currently only implemented for sh*-*-*. 503 1.1.1.5 mrg 504 1.1.1.5 mrg <p><var>endians</var> may be one of the following: 505 1.1.1.5 mrg <dl> 506 1.1.1.5 mrg <dt><code>big</code><dd>Use big endian exclusively. 507 1.1.1.5 mrg <br><dt><code>little</code><dd>Use little endian exclusively. 508 1.1.1.5 mrg <br><dt><code>big,little</code><dd>Use big endian by default. Provide a multilib for little endian. 509 1.1.1.5 mrg <br><dt><code>little,big</code><dd>Use little endian by default. Provide a multilib for big endian. 510 1.1 mrg </dl> 511 1.1 mrg 512 1.1.1.5 mrg <br><dt><code>--enable-threads</code><dd>Specify that the target 513 1.1 mrg supports threads. This affects the Objective-C compiler and runtime 514 1.1.1.5 mrg library, and exception handling for other languages like C++ and Java. 515 1.1 mrg On some systems, this is the default. 516 1.1.1.5 mrg 517 1.1.1.5 mrg <p>In general, the best (and, in many cases, the only known) threading 518 1.1 mrg model available will be configured for use. Beware that on some 519 1.1 mrg systems, GCC has not been taught what threading models are generally 520 1.1.1.5 mrg available for the system. In this case, <samp><span class="option">--enable-threads</span></samp> is an 521 1.1.1.5 mrg alias for <samp><span class="option">--enable-threads=single</span></samp>. 522 1.1.1.5 mrg 523 1.1.1.5 mrg <br><dt><code>--disable-threads</code><dd>Specify that threading support should be disabled for the system. 524 1.1.1.5 mrg This is an alias for <samp><span class="option">--enable-threads=single</span></samp>. 525 1.1.1.5 mrg 526 1.1.1.5 mrg <br><dt><code>--enable-threads=</code><var>lib</var><dd>Specify that 527 1.1 mrg <var>lib</var> is the thread support library. This affects the Objective-C 528 1.1 mrg compiler and runtime library, and exception handling for other languages 529 1.1 mrg like C++ and Java. The possibilities for <var>lib</var> are: 530 1.1.1.5 mrg 531 1.1.1.5 mrg <dl> 532 1.1.1.5 mrg <dt><code>aix</code><dd>AIX thread support. 533 1.1.1.5 mrg <br><dt><code>dce</code><dd>DCE thread support. 534 1.1.1.5 mrg <br><dt><code>lynx</code><dd>LynxOS thread support. 535 1.1.1.5 mrg <br><dt><code>mipssde</code><dd>MIPS SDE thread support. 536 1.1.1.5 mrg <br><dt><code>no</code><dd>This is an alias for ‘<samp><span class="samp">single</span></samp>’. 537 1.1.1.5 mrg <br><dt><code>posix</code><dd>Generic POSIX/Unix98 thread support. 538 1.1.1.5 mrg <br><dt><code>rtems</code><dd>RTEMS thread support. 539 1.1.1.5 mrg <br><dt><code>single</code><dd>Disable thread support, should work for all platforms. 540 1.1.1.5 mrg <br><dt><code>tpf</code><dd>TPF thread support. 541 1.1.1.5 mrg <br><dt><code>vxworks</code><dd>VxWorks thread support. 542 1.1.1.5 mrg <br><dt><code>win32</code><dd>Microsoft Win32 API thread support. 543 1.1 mrg </dl> 544 1.1 mrg 545 1.1.1.5 mrg <br><dt><code>--enable-tls</code><dd>Specify that the target supports TLS (Thread Local Storage). Usually 546 1.1 mrg configure can correctly determine if TLS is supported. In cases where 547 1.1 mrg it guesses incorrectly, TLS can be explicitly enabled or disabled with 548 1.1.1.5 mrg <samp><span class="option">--enable-tls</span></samp> or <samp><span class="option">--disable-tls</span></samp>. This can happen if 549 1.1 mrg the assembler supports TLS but the C library does not, or if the 550 1.1 mrg assumptions made by the configure test are incorrect. 551 1.1.1.5 mrg 552 1.1.1.5 mrg <br><dt><code>--disable-tls</code><dd>Specify that the target does not support TLS. 553 1.1.1.5 mrg This is an alias for <samp><span class="option">--enable-tls=no</span></samp>. 554 1.1.1.5 mrg 555 1.1.1.5 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. 556 1.1.1.5 mrg <var>cpu</var> will be used as the default value of the <samp><span class="option">-mcpu=</span></samp> switch. 557 1.1 mrg This option is only supported on some targets, including ARM, i386, M68k, 558 1.1.1.5 mrg PowerPC, and SPARC. The <samp><span class="option">--with-cpu-32</span></samp> and 559 1.1.1.5 mrg <samp><span class="option">--with-cpu-64</span></samp> options specify separate default CPUs for 560 1.1 mrg 32-bit and 64-bit modes; these options are only supported for i386, 561 1.1 mrg x86-64 and PowerPC. 562 1.1.1.5 mrg 563 1.1.1.5 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>, 564 1.1.1.5 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> 565 1.1.1.5 mrg options and for <samp><span class="option">-mhard-float</span></samp> or <samp><span class="option">-msoft-float</span></samp>. As with 566 1.1.1.5 mrg <samp><span class="option">--with-cpu</span></samp>, which switches will be accepted and acceptable values 567 1.1 mrg of the arguments depend on the target. 568 1.1.1.5 mrg 569 1.1.1.5 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>. 570 1.1 mrg This option is only supported on ARM targets. 571 1.1.1.5 mrg 572 1.1.1.5 mrg <br><dt><code>--with-stack-offset=</code><var>num</var><dd>This option sets the default for the -mstack-offset=<var>num</var> option, 573 1.1.1.3 skrll and will thus generally also control the setting of this option for 574 1.1.1.3 skrll libraries. This option is only supported on Epiphany targets. 575 1.1.1.5 mrg 576 1.1.1.5 mrg <br><dt><code>--with-fpmath=</code><var>isa</var><dd>This options sets <samp><span class="option">-mfpmath=sse</span></samp> by default and specifies the default 577 1.1.1.5 mrg ISA for floating-point arithmetics. You can select either ‘<samp><span class="samp">sse</span></samp>’ which 578 1.1.1.5 mrg enables <samp><span class="option">-msse2</span></samp> or ‘<samp><span class="samp">avx</span></samp>’ which enables <samp><span class="option">-mavx</span></samp> by default. 579 1.1.1.3 skrll This option is only supported on i386 and x86-64 targets. 580 1.1.1.5 mrg 581 1.1.1.5 mrg <br><dt><code>--with-divide=</code><var>type</var><dd>Specify how the compiler should generate code for checking for 582 1.1.1.5 mrg division by zero. This option is only supported on the MIPS target. 583 1.1 mrg The possibilities for <var>type</var> are: 584 1.1.1.5 mrg <dl> 585 1.1.1.5 mrg <dt><code>traps</code><dd>Division by zero checks use conditional traps (this is the default on 586 1.1.1.5 mrg systems that support conditional traps). 587 1.1.1.5 mrg <br><dt><code>breaks</code><dd>Division by zero checks use the break instruction. 588 1.1 mrg </dl> 589 1.1 mrg 590 1.1.1.5 mrg <!-- If you make -with-llsc the default for additional targets, --> 591 1.1.1.5 mrg <!-- update the -with-llsc description in the MIPS section below. --> 592 1.1.1.5 mrg <br><dt><code>--with-llsc</code><dd>On MIPS targets, make <samp><span class="option">-mllsc</span></samp> the default when no 593 1.1.1.5 mrg <samp><span class="option">-mno-llsc</span></samp> option is passed. This is the default for 594 1.1 mrg Linux-based targets, as the kernel will emulate them if the ISA does 595 1.1 mrg not provide them. 596 1.1.1.5 mrg 597 1.1.1.5 mrg <br><dt><code>--without-llsc</code><dd>On MIPS targets, make <samp><span class="option">-mno-llsc</span></samp> the default when no 598 1.1.1.5 mrg <samp><span class="option">-mllsc</span></samp> option is passed. 599 1.1.1.5 mrg 600 1.1.1.5 mrg <br><dt><code>--with-synci</code><dd>On MIPS targets, make <samp><span class="option">-msynci</span></samp> the default when no 601 1.1.1.5 mrg <samp><span class="option">-mno-synci</span></samp> option is passed. 602 1.1.1.5 mrg 603 1.1.1.5 mrg <br><dt><code>--without-synci</code><dd>On MIPS targets, make <samp><span class="option">-mno-synci</span></samp> the default when no 604 1.1.1.5 mrg <samp><span class="option">-msynci</span></samp> option is passed. This is the default. 605 1.1.1.5 mrg 606 1.1.1.5 mrg <br><dt><code>--with-mips-plt</code><dd>On MIPS targets, make use of copy relocations and PLTs. 607 1.1 mrg These features are extensions to the traditional 608 1.1 mrg SVR4-based MIPS ABIs and require support from GNU binutils 609 1.1 mrg and the runtime C library. 610 1.1.1.5 mrg 611 1.1.1.5 mrg <br><dt><code>--enable-__cxa_atexit</code><dd>Define if you want to use __cxa_atexit, rather than atexit, to 612 1.1.1.5 mrg register C++ destructors for local statics and global objects. 613 1.1 mrg This is essential for fully standards-compliant handling of 614 1.1 mrg destructors, but requires __cxa_atexit in libc. This option is currently 615 1.1 mrg only available on systems with GNU libc. When enabled, this will cause 616 1.1.1.5 mrg <samp><span class="option">-fuse-cxa-atexit</span></samp> to be passed by default. 617 1.1.1.5 mrg 618 1.1.1.5 mrg <br><dt><code>--enable-gnu-indirect-function</code><dd>Define if you want to enable the <code>ifunc</code> attribute. This option is 619 1.1.1.3 skrll currently only available on systems with GNU libc on certain targets. 620 1.1.1.5 mrg 621 1.1.1.5 mrg <br><dt><code>--enable-target-optspace</code><dd>Specify that target 622 1.1.1.5 mrg libraries should be optimized for code space instead of code speed. 623 1.1 mrg This is the default for the m32r platform. 624 1.1.1.5 mrg 625 1.1.1.5 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 626 1.1.1.5 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>. 627 1.1.1.5 mrg 628 1.1.1.5 mrg <br><dt><code>--enable-comdat</code><dd>Enable COMDAT group support. This is primarily used to override the 629 1.1 mrg automatically detected value. 630 1.1.1.5 mrg 631 1.1.1.5 mrg <br><dt><code>--enable-initfini-array</code><dd>Force the use of sections <code>.init_array</code> and <code>.fini_array</code> 632 1.1 mrg (instead of <code>.init</code> and <code>.fini</code>) for constructors and 633 1.1.1.5 mrg destructors. Option <samp><span class="option">--disable-initfini-array</span></samp> has the 634 1.1 mrg opposite effect. If neither option is specified, the configure script 635 1.1 mrg will try to guess whether the <code>.init_array</code> and 636 1.1 mrg <code>.fini_array</code> sections are supported and, if they are, use them. 637 1.1.1.5 mrg 638 1.1.1.5 mrg <br><dt><code>--enable-maintainer-mode</code><dd>The build rules that regenerate the Autoconf and Automake output files as 639 1.1.1.5 mrg well as the GCC master message catalog <samp><span class="file">gcc.pot</span></samp> are normally 640 1.1 mrg disabled. This is because it can only be rebuilt if the complete source 641 1.1 mrg tree is present. If you have changed the sources and want to rebuild the 642 1.1.1.5 mrg catalog, configuring with <samp><span class="option">--enable-maintainer-mode</span></samp> will enable 643 1.1 mrg this. Note that you need a recent version of the <code>gettext</code> tools 644 1.1 mrg to do so. 645 1.1.1.5 mrg 646 1.1.1.5 mrg <br><dt><code>--disable-bootstrap</code><dd>For a native build, the default configuration is to perform 647 1.1.1.5 mrg a 3-stage bootstrap of the compiler when ‘<samp><span class="samp">make</span></samp>’ is invoked, 648 1.1 mrg testing that GCC can compile itself correctly. If you want to disable 649 1.1.1.5 mrg this process, you can configure with <samp><span class="option">--disable-bootstrap</span></samp>. 650 1.1.1.5 mrg 651 1.1.1.5 mrg <br><dt><code>--enable-bootstrap</code><dd>In special cases, you may want to perform a 3-stage build 652 1.1.1.5 mrg even if the target and host triplets are different. 653 1.1 mrg This is possible when the host can run code compiled for 654 1.1.1.5 mrg the target (e.g. host is i686-linux, target is i486-linux). 655 1.1 mrg Starting from GCC 4.2, to do this you have to configure explicitly 656 1.1.1.5 mrg with <samp><span class="option">--enable-bootstrap</span></samp>. 657 1.1.1.5 mrg 658 1.1.1.5 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 659 1.1 mrg info manuals and man pages that are built from the .texi files are present 660 1.1 mrg in the SVN development tree. When building GCC from that development tree, 661 1.1 mrg or from one of our snapshots, those generated files are placed in your 662 1.1 mrg build directory, which allows for the source to be in a readonly 663 1.1 mrg directory. 664 1.1.1.5 mrg 665 1.1.1.5 mrg <p>If you configure with <samp><span class="option">--enable-generated-files-in-srcdir</span></samp> then those 666 1.1 mrg generated files will go into the source directory. This is mainly intended 667 1.1 mrg for generating release or prerelease tarballs of the GCC sources, since it 668 1.1 mrg is not a requirement that the users of source releases to have flex, Bison, 669 1.1 mrg or makeinfo. 670 1.1.1.5 mrg 671 1.1.1.5 mrg <br><dt><code>--enable-version-specific-runtime-libs</code><dd>Specify 672 1.1 mrg that runtime libraries should be installed in the compiler specific 673 1.1.1.5 mrg subdirectory (<samp><var>libdir</var><span class="file">/gcc</span></samp>) rather than the usual places. In 674 1.1.1.5 mrg addition, ‘<samp><span class="samp">libstdc++</span></samp>’'s include files will be installed into 675 1.1 mrg <samp><var>libdir</var></samp> unless you overruled it by using 676 1.1.1.5 mrg <samp><span class="option">--with-gxx-include-dir=</span><var>dirname</var></samp>. Using this option is 677 1.1 mrg particularly useful if you intend to use several versions of GCC in 678 1.1.1.5 mrg parallel. This is currently supported by ‘<samp><span class="samp">libgfortran</span></samp>’, 679 1.1.1.5 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>’. 680 1.1.1.5 mrg 681 1.1.1.5 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 682 1.1 mrg their runtime libraries should be built. For a list of valid values for 683 1.1 mrg <var>langN</var> you can issue the following command in the 684 1.1.1.5 mrg <samp><span class="file">gcc</span></samp> directory of your GCC source tree:<br> 685 1.1.1.5 mrg <pre class="smallexample"> grep language= */config-lang.in 686 1.1.1.5 mrg </pre> 687 1.1.1.5 mrg <p>Currently, you can use any of the following: 688 1.1.1.3 skrll <code>all</code>, <code>ada</code>, <code>c</code>, <code>c++</code>, <code>fortran</code>, 689 1.1.1.5 mrg <code>go</code>, <code>java</code>, <code>objc</code>, <code>obj-c++</code>. 690 1.1.1.5 mrg Building the Ada compiler has special requirements, see below. 691 1.1 mrg If you do not pass this flag, or specify the option <code>all</code>, then all 692 1.1.1.5 mrg default languages available in the <samp><span class="file">gcc</span></samp> sub-tree will be configured. 693 1.1.1.3 skrll Ada, Go and Objective-C++ are not default languages; the rest are. 694 1.1.1.5 mrg 695 1.1.1.5 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 696 1.1 mrg libraries should be built with the system C compiler during stage 1 of 697 1.1 mrg the bootstrap process, rather than only in later stages with the 698 1.1 mrg bootstrapped C compiler. The list of valid values is the same as for 699 1.1.1.5 mrg <samp><span class="option">--enable-languages</span></samp>, and the option <code>all</code> will select all 700 1.1.1.5 mrg of the languages enabled by <samp><span class="option">--enable-languages</span></samp>. This option is 701 1.1 mrg primarily useful for GCC development; for instance, when a development 702 1.1 mrg version of the compiler cannot bootstrap due to compiler bugs, or when 703 1.1 mrg one is debugging front ends other than the C front end. When this 704 1.1 mrg option is used, one can then build the target libraries for the 705 1.1.1.5 mrg specified languages with the stage-1 compiler by using <samp><span class="command">make 706 1.1.1.5 mrg stage1-bubble all-target</span></samp>, or run the testsuite on the stage-1 compiler 707 1.1.1.5 mrg for the specified languages using <samp><span class="command">make stage1-start check-gcc</span></samp>. 708 1.1.1.5 mrg 709 1.1.1.5 mrg <br><dt><code>--disable-libada</code><dd>Specify that the run-time libraries and tools used by GNAT should not 710 1.1 mrg be built. This can be useful for debugging, or for compatibility with 711 1.1 mrg previous Ada build procedures, when it was required to explicitly 712 1.1.1.5 mrg do a ‘<samp><span class="samp">make -C gcc gnatlib_and_tools</span></samp>’. 713 1.1.1.5 mrg 714 1.1.1.5 mrg <br><dt><code>--disable-libssp</code><dd>Specify that the run-time libraries for stack smashing protection 715 1.1 mrg should not be built. 716 1.1.1.5 mrg 717 1.1.1.5 mrg <br><dt><code>--disable-libquadmath</code><dd>Specify that the GCC quad-precision math library should not be built. 718 1.1.1.3 skrll On some systems, the library is required to be linkable when building 719 1.1.1.5 mrg the Fortran front end, unless <samp><span class="option">--disable-libquadmath-support</span></samp> 720 1.1.1.3 skrll is used. 721 1.1.1.5 mrg 722 1.1.1.5 mrg <br><dt><code>--disable-libquadmath-support</code><dd>Specify that the Fortran front end and <code>libgfortran</code> do not add 723 1.1.1.3 skrll support for <code>libquadmath</code> on systems supporting it. 724 1.1.1.5 mrg 725 1.1.1.5 mrg <br><dt><code>--disable-libgomp</code><dd>Specify that the run-time libraries used by GOMP should not be built. 726 1.1.1.5 mrg 727 1.1.1.5 mrg <br><dt><code>--with-dwarf2</code><dd>Specify that the compiler should 728 1.1 mrg use DWARF 2 debugging information as the default. 729 1.1.1.5 mrg 730 1.1.1.5 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. 731 1.1 mrg These are compilers that are able to generate either 64-bit or 32-bit 732 1.1.1.5 mrg code. Typically, the corresponding 32-bit target, e.g. 733 1.1 mrg powerpc-linux for powerpc64-linux, only generates 32-bit code. This 734 1.1 mrg option enables the 32-bit target to be a bi-arch compiler, which is 735 1.1 mrg useful when you want a bi-arch compiler that defaults to 32-bit, and 736 1.1.1.5 mrg you are building a bi-arch or multi-arch binutils in a combined tree. 737 1.1 mrg On mips-linux, this will build a tri-arch compiler (ABI o32/n32/64), 738 1.1.1.5 mrg defaulted to o32. 739 1.1.1.3 skrll Currently, this option only affects sparc-linux, powerpc-linux, x86-linux, 740 1.1.1.3 skrll mips-linux and s390-linux. 741 1.1.1.5 mrg 742 1.1.1.5 mrg <br><dt><code>--enable-secureplt</code><dd>This option enables <samp><span class="option">-msecure-plt</span></samp> by default for powerpc-linux. 743 1.1 mrg See “RS/6000 and PowerPC Options” in the main manual 744 1.1.1.5 mrg 745 1.1.1.5 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. 746 1.1 mrg See “i386 and x86-64 Options” in the main manual 747 1.1.1.5 mrg 748 1.1.1.5 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 749 1.1 mrg to look up installations paths in the registry using the following key: 750 1.1 mrg 751 1.1.1.5 mrg <pre class="smallexample"> <code>HKEY_LOCAL_MACHINE\SOFTWARE\Free Software Foundation\</code><var>key</var> 752 1.1.1.5 mrg </pre> 753 1.1.1.5 mrg <p><var>key</var> defaults to GCC version number, and can be overridden by the 754 1.1.1.5 mrg <samp><span class="option">--enable-win32-registry=</span><var>key</var></samp> option. Vendors and distributors 755 1.1 mrg who use custom installers are encouraged to provide a different key, 756 1.1 mrg perhaps one comprised of vendor name and GCC version number, to 757 1.1 mrg avoid conflict with existing installations. This feature is enabled 758 1.1.1.5 mrg by default, and can be disabled by <samp><span class="option">--disable-win32-registry</span></samp> 759 1.1 mrg option. This option has no effect on the other hosts. 760 1.1.1.5 mrg 761 1.1.1.5 mrg <br><dt><code>--nfp</code><dd>Specify that the machine does not have a floating point unit. This 762 1.1.1.5 mrg option only applies to ‘<samp><span class="samp">m68k-sun-sunos</span><var>n</var></samp>’. On any other 763 1.1.1.5 mrg system, <samp><span class="option">--nfp</span></samp> has no effect. 764 1.1.1.5 mrg 765 1.1.1.5 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 766 1.1.1.5 mrg compiler are built with <samp><span class="option">-Werror</span></samp> in bootstrap stage2 and later. 767 1.1.1.5 mrg If you don't specify it, <samp><span class="option">-Werror</span></samp> is turned on for the main 768 1.1 mrg development trunk. However it defaults to off for release branches and 769 1.1.1.5 mrg final releases. The specific files which get <samp><span class="option">-Werror</span></samp> are 770 1.1 mrg controlled by the Makefiles. 771 1.1.1.5 mrg 772 1.1.1.5 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 773 1.1 mrg consistency checks of the requested complexity. This does not change the 774 1.1 mrg generated code, but adds error checking within the compiler. This will 775 1.1 mrg slow down the compiler and may only work properly if you are building 776 1.1.1.5 mrg the compiler with GCC. This is ‘<samp><span class="samp">yes</span></samp>’ by default when building 777 1.1.1.5 mrg from SVN or snapshots, but ‘<samp><span class="samp">release</span></samp>’ for releases. The default 778 1.1.1.5 mrg for building the stage1 compiler is ‘<samp><span class="samp">yes</span></samp>’. More control 779 1.1 mrg over the checks may be had by specifying <var>list</var>. The categories of 780 1.1.1.5 mrg checks available are ‘<samp><span class="samp">yes</span></samp>’ (most common checks 781 1.1.1.5 mrg ‘<samp><span class="samp">assert,misc,tree,gc,rtlflag,runtime</span></samp>’), ‘<samp><span class="samp">no</span></samp>’ (no checks at 782 1.1.1.5 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 783 1.1.1.5 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>’). 784 1.1.1.5 mrg Individual checks can be enabled with these flags ‘<samp><span class="samp">assert</span></samp>’, 785 1.1.1.5 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>’, 786 1.1.1.5 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>’. 787 1.1.1.5 mrg 788 1.1.1.5 mrg <p>The ‘<samp><span class="samp">valgrind</span></samp>’ check requires the external <samp><span class="command">valgrind</span></samp> 789 1.1 mrg simulator, available from <a href="http://valgrind.org/">http://valgrind.org/</a>. The 790 1.1.1.5 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. 791 1.1.1.5 mrg To disable all checking, ‘<samp><span class="samp">--disable-checking</span></samp>’ or 792 1.1.1.5 mrg ‘<samp><span class="samp">--enable-checking=none</span></samp>’ must be explicitly requested. Disabling 793 1.1 mrg assertions will make the compiler and runtime slightly faster but 794 1.1 mrg increase the risk of undetected internal errors causing wrong code to be 795 1.1 mrg generated. 796 1.1.1.5 mrg 797 1.1.1.5 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 798 1.1.1.5 mrg compiler will be built with ‘<samp><span class="samp">yes</span></samp>’ checking enabled, otherwise 799 1.1 mrg the stage1 checking flags are the same as specified by 800 1.1.1.5 mrg <samp><span class="option">--enable-checking</span></samp>. To build the stage1 compiler with 801 1.1.1.5 mrg different checking options use <samp><span class="option">--enable-stage1-checking</span></samp>. 802 1.1.1.5 mrg The list of checking options is the same as for <samp><span class="option">--enable-checking</span></samp>. 803 1.1 mrg If your system is too slow or too small to bootstrap a released compiler 804 1.1.1.5 mrg with checking for stage1 enabled, you can use ‘<samp><span class="samp">--disable-stage1-checking</span></samp>’ 805 1.1 mrg to disable checking for the stage1 compiler. 806 1.1.1.5 mrg 807 1.1.1.5 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 808 1.1 mrg information, every time it is run. This is for internal development 809 1.1 mrg purposes, and only works when the compiler is being built with gcc. The 810 1.1 mrg <var>level</var> argument controls whether the compiler is built optimized or 811 1.1.1.5 mrg not, values are ‘<samp><span class="samp">opt</span></samp>’ and ‘<samp><span class="samp">noopt</span></samp>’. For coverage analysis you 812 1.1 mrg want to disable optimization, for performance analysis you want to 813 1.1 mrg enable optimization. When coverage is enabled, the default level is 814 1.1 mrg without optimization. 815 1.1.1.5 mrg 816 1.1.1.5 mrg <br><dt><code>--enable-gather-detailed-mem-stats</code><dd>When this option is specified more detailed information on memory 817 1.1 mrg allocation is gathered. This information is printed when using 818 1.1.1.5 mrg <samp><span class="option">-fmem-report</span></samp>. 819 1.1.1.5 mrg 820 1.1.1.5 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), 821 1.1 mrg which lets GCC output diagnostics in languages other than American 822 1.1 mrg English. Native Language Support is enabled by default if not doing a 823 1.1.1.5 mrg canadian cross build. The <samp><span class="option">--disable-nls</span></samp> option disables NLS. 824 1.1.1.5 mrg 825 1.1.1.5 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 826 1.1.1.5 mrg procedure to prefer its copy of GNU <samp><span class="command">gettext</span></samp>. 827 1.1.1.5 mrg 828 1.1.1.5 mrg <br><dt><code>--with-catgets</code><dd>If NLS is enabled, and if the host lacks <code>gettext</code> but has the 829 1.1 mrg inferior <code>catgets</code> interface, the GCC build procedure normally 830 1.1.1.5 mrg ignores <code>catgets</code> and instead uses GCC's copy of the GNU 831 1.1.1.5 mrg <code>gettext</code> library. The <samp><span class="option">--with-catgets</span></samp> option causes the 832 1.1.1.5 mrg build procedure to use the host's <code>catgets</code> in this situation. 833 1.1.1.5 mrg 834 1.1.1.5 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 835 1.1.1.5 mrg libiconv library files in <samp><var>dir</var><span class="file">/lib</span></samp>. 836 1.1.1.5 mrg 837 1.1.1.5 mrg <br><dt><code>--enable-obsolete</code><dd>Enable configuration for an obsoleted system. If you attempt to 838 1.1 mrg configure GCC for a system (build, host, or target) which has been 839 1.1 mrg obsoleted, and you do not specify this flag, configure will halt with an 840 1.1 mrg error message. 841 1.1.1.5 mrg 842 1.1.1.5 mrg <p>All support for systems which have been obsoleted in one release of GCC 843 1.1 mrg is removed entirely in the next major release, unless someone steps 844 1.1 mrg forward to maintain the port. 845 1.1.1.5 mrg 846 1.1.1.5 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 847 1.1 mrg that is in the IEEE 754-2008 standard. This is enabled by default only 848 1.1 mrg on PowerPC, i386, and x86_64 GNU/Linux systems. Other systems may also 849 1.1 mrg support it, but require the user to specifically enable it. You can 850 1.1 mrg optionally control which decimal floating point format is used (either 851 1.1.1.5 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) 852 1.1.1.5 mrg format is default on i386 and x86_64 systems, and the ‘<samp><span class="samp">dpd</span></samp>’ 853 1.1 mrg (densely packed decimal) format is default on PowerPC systems. 854 1.1.1.5 mrg 855 1.1.1.5 mrg <br><dt><code>--enable-fixed-point</code><dt><code>--disable-fixed-point</code><dd>Enable (or disable) support for C fixed-point arithmetic. 856 1.1 mrg This option is enabled by default for some targets (such as MIPS) which 857 1.1 mrg have hardware-support for fixed-point operations. On other targets, you 858 1.1 mrg may enable this option manually. 859 1.1.1.5 mrg 860 1.1.1.5 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 861 1.1 mrg GNU/Linux architectures. If using <code>--without-long-double-128</code>, 862 1.1.1.5 mrg <code>long double</code> will be by default 64-bit, the same as <code>double</code> type. 863 1.1 mrg When neither of these configure options are used, the default will be 864 1.1 mrg 128-bit <code>long double</code> when built against GNU C Library 2.4 and later, 865 1.1 mrg 64-bit <code>long double</code> otherwise. 866 1.1.1.5 mrg 867 1.1.1.5 mrg <br><dt><code>--with-gmp=</code><var>pathname</var><dt><code>--with-gmp-include=</code><var>pathname</var><dt><code>--with-gmp-lib=</code><var>pathname</var><dt><code>--with-mpfr=</code><var>pathname</var><dt><code>--with-mpfr-include=</code><var>pathname</var><dt><code>--with-mpfr-lib=</code><var>pathname</var><dt><code>--with-mpc=</code><var>pathname</var><dt><code>--with-mpc-include=</code><var>pathname</var><dt><code>--with-mpc-lib=</code><var>pathname</var><dd>If you want to build GCC but do not have the GMP library, the MPFR 868 1.1 mrg library and/or the MPC library installed in a standard location and 869 1.1.1.3 skrll do not have their sources present in the GCC source tree then you 870 1.1.1.3 skrll can explicitly specify the directory where they are installed 871 1.1.1.5 mrg (‘<samp><span class="samp">--with-gmp=</span><var>gmpinstalldir</var></samp>’, 872 1.1.1.5 mrg ‘<samp><span class="samp">--with-mpfr=</span><var>mpfrinstalldir</var></samp>’, 873 1.1.1.5 mrg ‘<samp><span class="samp">--with-mpc=</span><var>mpcinstalldir</var></samp>’). The 874 1.1.1.5 mrg <samp><span class="option">--with-gmp=</span><var>gmpinstalldir</var></samp> option is shorthand for 875 1.1.1.5 mrg <samp><span class="option">--with-gmp-lib=</span><var>gmpinstalldir</var><span class="option">/lib</span></samp> and 876 1.1.1.5 mrg <samp><span class="option">--with-gmp-include=</span><var>gmpinstalldir</var><span class="option">/include</span></samp>. Likewise the 877 1.1.1.5 mrg <samp><span class="option">--with-mpfr=</span><var>mpfrinstalldir</var></samp> option is shorthand for 878 1.1.1.5 mrg <samp><span class="option">--with-mpfr-lib=</span><var>mpfrinstalldir</var><span class="option">/lib</span></samp> and 879 1.1.1.5 mrg <samp><span class="option">--with-mpfr-include=</span><var>mpfrinstalldir</var><span class="option">/include</span></samp>, also the 880 1.1.1.5 mrg <samp><span class="option">--with-mpc=</span><var>mpcinstalldir</var></samp> option is shorthand for 881 1.1.1.5 mrg <samp><span class="option">--with-mpc-lib=</span><var>mpcinstalldir</var><span class="option">/lib</span></samp> and 882 1.1.1.5 mrg <samp><span class="option">--with-mpc-include=</span><var>mpcinstalldir</var><span class="option">/include</span></samp>. If these 883 1.1 mrg shorthand assumptions are not correct, you can use the explicit 884 1.1.1.3 skrll include and lib options directly. You might also need to ensure the 885 1.1.1.3 skrll shared libraries can be found by the dynamic linker when building and 886 1.1.1.3 skrll using GCC, for example by setting the runtime shared library path 887 1.1.1.5 mrg variable (<samp><span class="env">LD_LIBRARY_PATH</span></samp> on GNU/Linux and Solaris systems). 888 1.1.1.5 mrg 889 1.1.1.5 mrg <p>These flags are applicable to the host platform only. When building 890 1.1.1.3 skrll a cross compiler, they will not be used to configure target libraries. 891 1.1.1.5 mrg 892 1.1.1.5 mrg <br><dt><code>--with-isl=</code><var>pathname</var><dt><code>--with-isl-include=</code><var>pathname</var><dt><code>--with-isl-lib=</code><var>pathname</var><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 ISL and the CLooG 893 1.1 mrg libraries installed in a standard location and you want to build GCC, 894 1.1 mrg you can explicitly specify the directory where they are installed 895 1.1.1.5 mrg (‘<samp><span class="samp">--with-isl=</span><var>islinstalldir</var></samp>’, 896 1.1.1.5 mrg ‘<samp><span class="samp">--with-cloog=</span><var>clooginstalldir</var></samp>’). The 897 1.1.1.5 mrg <samp><span class="option">--with-isl=</span><var>islinstalldir</var></samp> option is shorthand for 898 1.1.1.5 mrg <samp><span class="option">--with-isl-lib=</span><var>islinstalldir</var><span class="option">/lib</span></samp> and 899 1.1.1.5 mrg <samp><span class="option">--with-isl-include=</span><var>islinstalldir</var><span class="option">/include</span></samp>. Likewise the 900 1.1.1.5 mrg <samp><span class="option">--with-cloog=</span><var>clooginstalldir</var></samp> option is shorthand for 901 1.1.1.5 mrg <samp><span class="option">--with-cloog-lib=</span><var>clooginstalldir</var><span class="option">/lib</span></samp> and 902 1.1.1.5 mrg <samp><span class="option">--with-cloog-include=</span><var>clooginstalldir</var><span class="option">/include</span></samp>. If these 903 1.1 mrg shorthand assumptions are not correct, you can use the explicit 904 1.1 mrg include and lib options directly. 905 1.1.1.5 mrg 906 1.1.1.5 mrg <p>These flags are applicable to the host platform only. When building 907 1.1.1.3 skrll a cross compiler, they will not be used to configure target libraries. 908 1.1.1.5 mrg 909 1.1.1.5 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 910 1.1 mrg to specify how the linker should find the standard C++ library used 911 1.1 mrg internally by PPL. Typical values of <var>linker-args</var> might be 912 1.1.1.5 mrg ‘<samp><span class="samp">-lstdc++</span></samp>’ or ‘<samp><span class="samp">-Wl,-Bstatic,-lstdc++,-Bdynamic -lm</span></samp>’. If you are 913 1.1 mrg linking with a shared copy of PPL, you probably do not need this 914 1.1 mrg option; shared library dependencies will cause the linker to search 915 1.1 mrg for the standard C++ library automatically. 916 1.1.1.5 mrg 917 1.1.1.5 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 918 1.1 mrg stage 1 of GCC. These are also used when linking GCC if configured with 919 1.1.1.5 mrg <samp><span class="option">--disable-bootstrap</span></samp>. By default no special flags are used. 920 1.1.1.5 mrg 921 1.1.1.5 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 1 922 1.1 mrg of GCC. These are also used when linking GCC if configured with 923 1.1.1.5 mrg <samp><span class="option">--disable-bootstrap</span></samp>. The default is the argument to 924 1.1.1.5 mrg <samp><span class="option">--with-host-libstdcxx</span></samp>, if specified. 925 1.1.1.5 mrg 926 1.1.1.5 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 927 1.1.1.3 skrll stage 2 and later when bootstrapping GCC. If neither –with-boot-libs 928 1.1.1.3 skrll nor –with-host-libstdcxx is set to a value, then the default is 929 1.1.1.5 mrg ‘<samp><span class="samp">-static-libstdc++ -static-libgcc</span></samp>’. 930 1.1.1.5 mrg 931 1.1.1.5 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 2 932 1.1 mrg and later when bootstrapping GCC. The default is the argument to 933 1.1.1.5 mrg <samp><span class="option">--with-host-libstdcxx</span></samp>, if specified. 934 1.1.1.5 mrg 935 1.1.1.5 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 936 1.1 mrg building runtime libraries. ‘<samp><var>map</var></samp>’ is a space-separated 937 1.1.1.5 mrg list of maps of the form ‘<samp><var>old</var><span class="samp">=</span><var>new</var></samp>’. 938 1.1.1.5 mrg 939 1.1.1.5 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 940 1.1.1.5 mrg links (links performed without the <samp><span class="option">-r</span></samp> or <samp><span class="option">--relocatable</span></samp> 941 1.1 mrg option), if the linker supports it. If you specify 942 1.1.1.5 mrg <samp><span class="option">--enable-linker-build-id</span></samp>, but your linker does not 943 1.1.1.5 mrg support <samp><span class="option">--build-id</span></samp> option, a warning is issued and the 944 1.1.1.5 mrg <samp><span class="option">--enable-linker-build-id</span></samp> option is ignored. The default is off. 945 1.1.1.5 mrg 946 1.1.1.5 mrg <br><dt><code>--with-linker-hash-style=</code><var>choice</var><dd>Tells GCC to pass <samp><span class="option">--hash-style=</span><var>choice</var></samp> option to the 947 1.1.1.3 skrll linker for all final links. <var>choice</var> can be one of 948 1.1.1.5 mrg ‘<samp><span class="samp">sysv</span></samp>’, ‘<samp><span class="samp">gnu</span></samp>’, and ‘<samp><span class="samp">both</span></samp>’ where ‘<samp><span class="samp">sysv</span></samp>’ is the default. 949 1.1.1.5 mrg 950 1.1.1.5 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 951 1.1 mrg static data members and inline function local statics. Enabled by 952 1.1 mrg default for a native toolchain with an assembler that accepts it and 953 1.1 mrg GLIBC 2.11 or above, otherwise disabled. 954 1.1.1.5 mrg 955 1.1.1.5 mrg <br><dt><code>--enable-lto</code><dt><code>--disable-lto</code><dd>Enable support for link-time optimization (LTO). This is enabled by 956 1.1.1.5 mrg default, and may be disabled using <samp><span class="option">--disable-lto</span></samp>. 957 1.1.1.5 mrg 958 1.1.1.5 mrg <br><dt><code>--with-plugin-ld=</code><var>pathname</var><dd>Enable an alternate linker to be used at link-time optimization (LTO) 959 1.1.1.5 mrg link time when <samp><span class="option">-fuse-linker-plugin</span></samp> is enabled. 960 1.1.1.3 skrll This linker should have plugin support such as gold starting with 961 1.1.1.5 mrg version 2.20 or GNU ld starting with version 2.21. 962 1.1.1.5 mrg See <samp><span class="option">-fuse-linker-plugin</span></samp> for details. 963 1.1.1.5 mrg 964 1.1.1.5 mrg <br><dt><code>--enable-canonical-system-headers</code><dt><code>--disable-canonical-system-headers</code><dd>Enable system header path canonicalization for <samp><span class="file">libcpp</span></samp>. This can 965 1.1.1.3 skrll produce shorter header file paths in diagnostics and dependency output 966 1.1.1.3 skrll files, but these changed header paths may conflict with some compilation 967 1.1.1.3 skrll environments. Enabled by default, and may be disabled using 968 1.1.1.5 mrg <samp><span class="option">--disable-canonical-system-headers</span></samp>. 969 1.1 mrg </dl> 970 1.1 mrg 971 1.1.1.5 mrg <h4 class="subheading"><a name="TOC3"></a>Cross-Compiler-Specific Options</h4> 972 1.1.1.5 mrg 973 1.1 mrg <p>The following options only apply to building cross compilers. 974 1.1.1.5 mrg 975 1.1.1.5 mrg <dl> 976 1.1.1.5 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 977 1.1.1.5 mrg (a subset of) the root filesystem of the target operating system. 978 1.1 mrg Target system headers, libraries and run-time object files will be 979 1.1.1.3 skrll searched for in there. More specifically, this acts as if 980 1.1.1.5 mrg <samp><span class="option">--sysroot=</span><var>dir</var></samp> was added to the default options of the built 981 1.1 mrg compiler. The specified directory is not copied into the 982 1.1.1.5 mrg install tree, unlike the options <samp><span class="option">--with-headers</span></samp> and 983 1.1.1.5 mrg <samp><span class="option">--with-libs</span></samp> that this option obsoletes. The default value, 984 1.1.1.5 mrg in case <samp><span class="option">--with-sysroot</span></samp> is not given an argument, is 985 1.1.1.5 mrg <samp><span class="option">${gcc_tooldir}/sys-root</span></samp>. If the specified directory is a 986 1.1.1.5 mrg subdirectory of <samp><span class="option">${exec_prefix}</span></samp>, then it will be found relative to 987 1.1 mrg the GCC binaries if the installation tree is moved. 988 1.1.1.5 mrg 989 1.1.1.5 mrg <p>This option affects the system root for the compiler used to build 990 1.1 mrg target libraries (which runs on the build system) and the compiler newly 991 1.1 mrg installed with <code>make install</code>; it does not affect the compiler which is 992 1.1 mrg used to build GCC itself. 993 1.1.1.5 mrg 994 1.1.1.5 mrg <p>If you specify the <samp><span class="option">--with-native-system-header-dir=</span><var>dirname</var></samp> 995 1.1.1.3 skrll option then the compiler will search that directory within <var>dirname</var> for 996 1.1.1.5 mrg native system headers rather than the default <samp><span class="file">/usr/include</span></samp>. 997 1.1.1.5 mrg 998 1.1.1.5 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 999 1.1.1.5 mrg <samp><span class="option">--with-sysroot</span></samp>) while building target libraries, instead of 1000 1.1.1.5 mrg the directory specified with <samp><span class="option">--with-sysroot</span></samp>. This option is 1001 1.1.1.5 mrg only useful when you are already using <samp><span class="option">--with-sysroot</span></samp>. You 1002 1.1.1.5 mrg can use <samp><span class="option">--with-build-sysroot</span></samp> when you are configuring with 1003 1.1.1.5 mrg <samp><span class="option">--prefix</span></samp> set to a directory that is different from the one in 1004 1.1 mrg which you are installing GCC and your target libraries. 1005 1.1.1.5 mrg 1006 1.1.1.5 mrg <p>This option affects the system root for the compiler used to build 1007 1.1 mrg target libraries (which runs on the build system); it does not affect 1008 1.1 mrg the compiler which is used to build GCC itself. 1009 1.1.1.5 mrg 1010 1.1.1.5 mrg <p>If you specify the <samp><span class="option">--with-native-system-header-dir=</span><var>dirname</var></samp> 1011 1.1.1.3 skrll option then the compiler will search that directory within <var>dirname</var> for 1012 1.1.1.5 mrg native system headers rather than the default <samp><span class="file">/usr/include</span></samp>. 1013 1.1.1.5 mrg 1014 1.1.1.5 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>. 1015 1.1.1.5 mrg Specifies that target headers are available when building a cross compiler. 1016 1.1 mrg The <var>dir</var> argument specifies a directory which has the target include 1017 1.1.1.5 mrg files. These include files will be copied into the <samp><span class="file">gcc</span></samp> install 1018 1.1.1.5 mrg directory. <em>This option with the </em><var>dir</var><em> argument is required</em> when 1019 1.1.1.5 mrg building a cross compiler, if <samp><var>prefix</var><span class="file">/</span><var>target</var><span class="file">/sys-include</span></samp> 1020 1.1.1.5 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 1021 1.1.1.5 mrg pre-exist, the <var>dir</var> argument may be omitted. <samp><span class="command">fixincludes</span></samp> 1022 1.1 mrg will be run on these files to make them compatible with GCC. 1023 1.1.1.5 mrg 1024 1.1.1.5 mrg <br><dt><code>--without-headers</code><dd>Tells GCC not use any target headers from a libc when building a cross 1025 1.1 mrg compiler. When crossing to GNU/Linux, you need the headers so GCC 1026 1.1 mrg can build the exception handling for libgcc. 1027 1.1.1.5 mrg 1028 1.1.1.5 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>. 1029 1.1 mrg Specifies a list of directories which contain the target runtime 1030 1.1.1.5 mrg libraries. These libraries will be copied into the <samp><span class="file">gcc</span></samp> install 1031 1.1 mrg directory. If the directory list is omitted, this option has no 1032 1.1 mrg effect. 1033 1.1.1.5 mrg 1034 1.1.1.5 mrg <br><dt><code>--with-newlib</code><dd>Specifies that ‘<samp><span class="samp">newlib</span></samp>’ is 1035 1.1 mrg being used as the target C library. This causes <code>__eprintf</code> to be 1036 1.1.1.5 mrg omitted from <samp><span class="file">libgcc.a</span></samp> on the assumption that it will be provided by 1037 1.1.1.5 mrg ‘<samp><span class="samp">newlib</span></samp>’. 1038 1.1.1.5 mrg 1039 1.1.1.5 mrg <br><dt><code>--with-avrlibc</code><dd>Specifies that ‘<samp><span class="samp">AVR-Libc</span></samp>’ is 1040 1.1.1.3 skrll being used as the target C library. This causes float support 1041 1.1.1.5 mrg functions like <code>__addsf3</code> to be omitted from <samp><span class="file">libgcc.a</span></samp> on 1042 1.1.1.5 mrg the assumption that it will be provided by <samp><span class="file">libm.a</span></samp>. For more 1043 1.1.1.5 mrg technical details, cf. <a href="http://gcc.gnu.org/PR54461">PR54461</a>. 1044 1.1.1.3 skrll This option is only supported for the AVR target. It is not supported for 1045 1.1.1.3 skrll RTEMS configurations, which currently use newlib. The option is 1046 1.1.1.3 skrll supported since version 4.7.2 and is the default in 4.8.0 and newer. 1047 1.1.1.5 mrg 1048 1.1.1.5 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.) 1049 1.1 mrg that will be used while building GCC itself. This option can be useful 1050 1.1 mrg if the directory layouts are different between the system you are building 1051 1.1 mrg GCC on, and the system where you will deploy it. 1052 1.1.1.5 mrg 1053 1.1.1.5 mrg <p>For example, on an ‘<samp><span class="samp">ia64-hp-hpux</span></samp>’ system, you may have the GNU 1054 1.1.1.5 mrg assembler and linker in <samp><span class="file">/usr/bin</span></samp>, and the native tools in a 1055 1.1 mrg different path, and build a toolchain that expects to find the 1056 1.1.1.5 mrg native tools in <samp><span class="file">/usr/bin</span></samp>. 1057 1.1.1.5 mrg 1058 1.1.1.5 mrg <p>When you use this option, you should ensure that <var>dir</var> includes 1059 1.1.1.5 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>, 1060 1.1.1.5 mrg <samp><span class="command">ranlib</span></samp> and <samp><span class="command">strip</span></samp> if necessary, and possibly 1061 1.1.1.5 mrg <samp><span class="command">objdump</span></samp>. Otherwise, GCC may use an inconsistent set of 1062 1.1.1.5 mrg tools. 1063 1.1 mrg </dl> 1064 1.1 mrg 1065 1.1.1.5 mrg <h4 class="subheading"><a name="TOC4"></a>Java-Specific Options</h4> 1066 1.1 mrg 1067 1.1 mrg <p>The following option applies to the build of the Java front end. 1068 1.1.1.5 mrg 1069 1.1.1.5 mrg <dl> 1070 1.1.1.5 mrg <dt><code>--disable-libgcj</code><dd>Specify that the run-time libraries 1071 1.1 mrg used by GCJ should not be built. This is useful in case you intend 1072 1.1.1.5 mrg to use GCJ with some other run-time, or you're going to install it 1073 1.1 mrg separately, or it just happens not to build on your particular 1074 1.1 mrg machine. In general, if the Java front end is enabled, the GCJ 1075 1.1.1.5 mrg libraries will be enabled too, unless they're known to not work on 1076 1.1.1.5 mrg the target platform. If GCJ is enabled but ‘<samp><span class="samp">libgcj</span></samp>’ isn't built, you 1077 1.1 mrg may need to port it; in this case, before modifying the top-level 1078 1.1.1.5 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, 1079 1.1.1.5 mrg you may use <samp><span class="option">--enable-libgcj</span></samp> to override the default. 1080 1.1.1.5 mrg 1081 1.1.1.5 mrg </dl> 1082 1.1.1.5 mrg 1083 1.1.1.5 mrg <p>The following options apply to building ‘<samp><span class="samp">libgcj</span></samp>’. 1084 1.1.1.5 mrg 1085 1.1.1.5 mrg <h5 class="subsubheading"><a name="TOC5"></a>General Options</h5> 1086 1.1 mrg 1087 1.1.1.5 mrg <dl> 1088 1.1.1.5 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 1089 1.1.1.5 mrg <samp><span class="file">.java</span></samp> source files to <samp><span class="file">.class</span></samp>. Instead, it will use the 1090 1.1.1.5 mrg <samp><span class="file">.class</span></samp> files from the source tree. If you use this option you 1091 1.1.1.5 mrg must have executables named <samp><span class="command">ecj1</span></samp> and <samp><span class="command">gjavah</span></samp> in your path 1092 1.1 mrg for use by the build. You must use this option if you intend to 1093 1.1.1.5 mrg modify any <samp><span class="file">.java</span></samp> files in <samp><span class="file">libjava</span></samp>. 1094 1.1.1.5 mrg 1095 1.1.1.5 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 1096 1.1.1.5 mrg ‘<samp><span class="samp">java.home</span></samp>’ system property. It is also used to set 1097 1.1.1.5 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 1098 1.1.1.5 mrg default ‘<samp><span class="samp">java.home</span></samp>’ is set to <samp><var>prefix</var></samp> and 1099 1.1.1.5 mrg ‘<samp><span class="samp">sun.boot.class.path</span></samp>’ to 1100 1.1.1.5 mrg <samp><var>datadir</var><span class="file">/java/libgcj-</span><var>version</var><span class="file">.jar</span></samp>. 1101 1.1.1.5 mrg 1102 1.1.1.5 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 1103 1.1 mrg file containing the Eclipse Java compiler. A specially modified 1104 1.1.1.5 mrg version of this compiler is used by <samp><span class="command">gcj</span></samp> to parse 1105 1.1.1.5 mrg <samp><span class="file">.java</span></samp> source files. If this option is given, the 1106 1.1.1.5 mrg ‘<samp><span class="samp">libjava</span></samp>’ build will create and install an <samp><span class="file">ecj1</span></samp> executable 1107 1.1 mrg which uses this jar file at runtime. 1108 1.1.1.5 mrg 1109 1.1.1.5 mrg <p>If this option is not given, but an <samp><span class="file">ecj.jar</span></samp> file is found in 1110 1.1.1.5 mrg the topmost source tree at configure time, then the ‘<samp><span class="samp">libgcj</span></samp>’ 1111 1.1.1.5 mrg build will create and install <samp><span class="file">ecj1</span></samp>, and will also install the 1112 1.1.1.5 mrg discovered <samp><span class="file">ecj.jar</span></samp> into a suitable place in the install tree. 1113 1.1.1.5 mrg 1114 1.1.1.5 mrg <p>If <samp><span class="file">ecj1</span></samp> is not installed, then the user will have to supply one 1115 1.1.1.5 mrg on his path in order for <samp><span class="command">gcj</span></samp> to properly parse <samp><span class="file">.java</span></samp> 1116 1.1 mrg source files. A suitable jar is available from 1117 1.1 mrg <a href="ftp://sourceware.org/pub/java/">ftp://sourceware.org/pub/java/</a>. 1118 1.1.1.5 mrg 1119 1.1.1.5 mrg <br><dt><code>--disable-getenv-properties</code><dd>Don't set system properties from <samp><span class="env">GCJ_PROPERTIES</span></samp>. 1120 1.1.1.5 mrg 1121 1.1.1.5 mrg <br><dt><code>--enable-hash-synchronization</code><dd>Use a global hash table for monitor locks. Ordinarily, 1122 1.1.1.5 mrg ‘<samp><span class="samp">libgcj</span></samp>’'s ‘<samp><span class="samp">configure</span></samp>’ script automatically makes 1123 1.1 mrg the correct choice for this option for your platform. Only use 1124 1.1 mrg this if you know you need the library to be configured differently. 1125 1.1.1.5 mrg 1126 1.1.1.5 mrg <br><dt><code>--enable-interpreter</code><dd>Enable the Java interpreter. The interpreter is automatically 1127 1.1 mrg enabled by default on all platforms that support it. This option 1128 1.1 mrg is really only useful if you want to disable the interpreter 1129 1.1.1.5 mrg (using <samp><span class="option">--disable-interpreter</span></samp>). 1130 1.1.1.5 mrg 1131 1.1.1.5 mrg <br><dt><code>--disable-java-net</code><dd>Disable java.net. This disables the native part of java.net only, 1132 1.1 mrg using non-functional stubs for native method implementations. 1133 1.1.1.5 mrg 1134 1.1.1.5 mrg <br><dt><code>--disable-jvmpi</code><dd>Disable JVMPI support. 1135 1.1.1.5 mrg 1136 1.1.1.5 mrg <br><dt><code>--disable-libgcj-bc</code><dd>Disable BC ABI compilation of certain parts of libgcj. By default, 1137 1.1.1.5 mrg some portions of libgcj are compiled with <samp><span class="option">-findirect-dispatch</span></samp> 1138 1.1.1.5 mrg and <samp><span class="option">-fno-indirect-classes</span></samp>, allowing them to be overridden at 1139 1.1 mrg run-time. 1140 1.1.1.5 mrg 1141 1.1.1.5 mrg <p>If <samp><span class="option">--disable-libgcj-bc</span></samp> is specified, libgcj is built without 1142 1.1 mrg these options. This allows the compile-time linker to resolve 1143 1.1 mrg dependencies when statically linking to libgcj. However it makes it 1144 1.1 mrg impossible to override the affected portions of libgcj at run-time. 1145 1.1.1.5 mrg 1146 1.1.1.5 mrg <br><dt><code>--enable-reduced-reflection</code><dd>Build most of libgcj with <samp><span class="option">-freduced-reflection</span></samp>. This reduces 1147 1.1 mrg the size of libgcj at the expense of not being able to do accurate 1148 1.1 mrg reflection on the classes it contains. This option is safe if you 1149 1.1 mrg know that code using libgcj will never use reflection on the standard 1150 1.1 mrg runtime classes in libgcj (including using serialization, RMI or CORBA). 1151 1.1.1.5 mrg 1152 1.1.1.5 mrg <br><dt><code>--with-ecos</code><dd>Enable runtime eCos target support. 1153 1.1.1.5 mrg 1154 1.1.1.5 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 1155 1.1.1.5 mrg support as well, as these require ‘<samp><span class="samp">libffi</span></samp>’ to work. 1156 1.1.1.5 mrg 1157 1.1.1.5 mrg <br><dt><code>--enable-libgcj-debug</code><dd>Enable runtime debugging code. 1158 1.1.1.5 mrg 1159 1.1.1.5 mrg <br><dt><code>--enable-libgcj-multifile</code><dd>If specified, causes all <samp><span class="file">.java</span></samp> source files to be 1160 1.1.1.5 mrg compiled into <samp><span class="file">.class</span></samp> files in one invocation of 1161 1.1.1.5 mrg ‘<samp><span class="samp">gcj</span></samp>’. This can speed up build time, but is more 1162 1.1 mrg resource-intensive. If this option is unspecified or 1163 1.1.1.5 mrg disabled, ‘<samp><span class="samp">gcj</span></samp>’ is invoked once for each <samp><span class="file">.java</span></samp> 1164 1.1.1.5 mrg file to compile into a <samp><span class="file">.class</span></samp> file. 1165 1.1.1.5 mrg 1166 1.1.1.5 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>. 1167 1.1.1.5 mrg 1168 1.1.1.5 mrg <br><dt><code>--enable-sjlj-exceptions</code><dd>Force use of the <code>setjmp</code>/<code>longjmp</code>-based scheme for exceptions. 1169 1.1.1.5 mrg ‘<samp><span class="samp">configure</span></samp>’ ordinarily picks the correct value based on the platform. 1170 1.1 mrg Only use this option if you are sure you need a different setting. 1171 1.1.1.5 mrg 1172 1.1.1.5 mrg <br><dt><code>--with-system-zlib</code><dd>Use installed ‘<samp><span class="samp">zlib</span></samp>’ rather than that included with GCC. 1173 1.1.1.5 mrg 1174 1.1.1.5 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 1175 1.1 mrg characters and the Win32 API. 1176 1.1.1.5 mrg 1177 1.1.1.5 mrg <br><dt><code>--enable-java-home</code><dd>If enabled, this creates a JPackage compatible SDK environment during install. 1178 1.1 mrg Note that if –enable-java-home is used, –with-arch-directory=ARCH must also 1179 1.1 mrg be specified. 1180 1.1.1.5 mrg 1181 1.1.1.5 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 1182 1.1 mrg environment created when –enable-java-home is passed. Typical names for this 1183 1.1 mrg directory include i386, amd64, ia64, etc. 1184 1.1.1.5 mrg 1185 1.1.1.5 mrg <br><dt><code>--with-os-directory=DIR</code><dd>Specifies the OS directory for the SDK include directory. This is set to auto 1186 1.1.1.5 mrg detect, and is typically 'linux'. 1187 1.1.1.5 mrg 1188 1.1.1.5 mrg <br><dt><code>--with-origin-name=NAME</code><dd>Specifies the JPackage origin name. This defaults to the 'gcj' in 1189 1.1 mrg java-1.5.0-gcj. 1190 1.1.1.5 mrg 1191 1.1.1.5 mrg <br><dt><code>--with-arch-suffix=SUFFIX</code><dd>Specifies the suffix for the sdk directory. Defaults to the empty string. 1192 1.1.1.5 mrg Examples include '.x86_64' in 'java-1.5.0-gcj-1.5.0.0.x86_64'. 1193 1.1.1.5 mrg 1194 1.1.1.5 mrg <br><dt><code>--with-jvm-root-dir=DIR</code><dd>Specifies where to install the SDK. Default is $(prefix)/lib/jvm. 1195 1.1.1.5 mrg 1196 1.1.1.5 mrg <br><dt><code>--with-jvm-jar-dir=DIR</code><dd>Specifies where to install jars. Default is $(prefix)/lib/jvm-exports. 1197 1.1.1.5 mrg 1198 1.1.1.5 mrg <br><dt><code>--with-python-dir=DIR</code><dd>Specifies where to install the Python modules used for aot-compile. DIR should 1199 1.1 mrg not include the prefix used in installation. For example, if the Python modules 1200 1.1 mrg are to be installed in /usr/lib/python2.5/site-packages, then 1201 1.1 mrg –with-python-dir=/lib/python2.5/site-packages should be passed. If this is 1202 1.1 mrg not specified, then the Python modules are installed in $(prefix)/share/python. 1203 1.1.1.5 mrg 1204 1.1.1.5 mrg <br><dt><code>--enable-aot-compile-rpm</code><dd>Adds aot-compile-rpm to the list of installed scripts. 1205 1.1.1.5 mrg 1206 1.1.1.5 mrg <br><dt><code>--enable-browser-plugin</code><dd>Build the gcjwebplugin web browser plugin. 1207 1.1.1.5 mrg 1208 1.1.1.5 mrg <br><dt><code>--enable-static-libjava</code><dd>Build static libraries in libjava. The default is to only build shared 1209 1.1.1.3 skrll libraries. 1210 1.1.1.5 mrg 1211 1.1.1.5 mrg <dl> 1212 1.1.1.5 mrg <dt><code>ansi</code><dd>Use the single-byte <code>char</code> and the Win32 A functions natively, 1213 1.1 mrg translating to and from UNICODE when using these functions. If 1214 1.1 mrg unspecified, this is the default. 1215 1.1.1.5 mrg 1216 1.1.1.5 mrg <br><dt><code>unicows</code><dd>Use the <code>WCHAR</code> and Win32 W functions natively. Adds 1217 1.1.1.5 mrg <code>-lunicows</code> to <samp><span class="file">libgcj.spec</span></samp> to link with ‘<samp><span class="samp">libunicows</span></samp>’. 1218 1.1.1.5 mrg <samp><span class="file">unicows.dll</span></samp> needs to be deployed on Microsoft Windows 9X machines 1219 1.1.1.5 mrg running built executables. <samp><span class="file">libunicows.a</span></samp>, an open-source 1220 1.1.1.5 mrg import library around Microsoft's <code>unicows.dll</code>, is obtained from 1221 1.1 mrg <a href="http://libunicows.sourceforge.net/">http://libunicows.sourceforge.net/</a>, which also gives details 1222 1.1.1.5 mrg on getting <samp><span class="file">unicows.dll</span></samp> from Microsoft. 1223 1.1.1.5 mrg 1224 1.1.1.5 mrg <br><dt><code>unicode</code><dd>Use the <code>WCHAR</code> and Win32 W functions natively. Does <em>not</em> 1225 1.1.1.5 mrg add <code>-lunicows</code> to <samp><span class="file">libgcj.spec</span></samp>. The built executables will 1226 1.1.1.5 mrg only run on Microsoft Windows NT and above. 1227 1.1 mrg </dl> 1228 1.1.1.5 mrg </dl> 1229 1.1 mrg 1230 1.1.1.5 mrg <h5 class="subsubheading"><a name="TOC6"></a>AWT-Specific Options</h5> 1231 1.1 mrg 1232 1.1.1.5 mrg <dl> 1233 1.1.1.5 mrg <dt><code>--with-x</code><dd>Use the X Window System. 1234 1.1 mrg 1235 1.1.1.5 mrg <br><dt><code>--enable-java-awt=PEER(S)</code><dd>Specifies the AWT peer library or libraries to build alongside 1236 1.1.1.5 mrg ‘<samp><span class="samp">libgcj</span></samp>’. If this option is unspecified or disabled, AWT 1237 1.1.1.5 mrg will be non-functional. Current valid values are <samp><span class="option">gtk</span></samp> and 1238 1.1.1.5 mrg <samp><span class="option">xlib</span></samp>. Multiple libraries should be separated by a 1239 1.1.1.5 mrg comma (i.e. <samp><span class="option">--enable-java-awt=gtk,xlib</span></samp>). 1240 1.1 mrg 1241 1.1.1.5 mrg <br><dt><code>--enable-gtk-cairo</code><dd>Build the cairo Graphics2D implementation on GTK. 1242 1.1 mrg 1243 1.1.1.5 mrg <br><dt><code>--enable-java-gc=TYPE</code><dd>Choose garbage collector. Defaults to <samp><span class="option">boehm</span></samp> if unspecified. 1244 1.1.1.5 mrg 1245 1.1.1.5 mrg <br><dt><code>--disable-gtktest</code><dd>Do not try to compile and run a test GTK+ program. 1246 1.1 mrg 1247 1.1.1.5 mrg <br><dt><code>--disable-glibtest</code><dd>Do not try to compile and run a test GLIB program. 1248 1.1 mrg 1249 1.1.1.5 mrg <br><dt><code>--with-libart-prefix=PFX</code><dd>Prefix where libart is installed (optional). 1250 1.1.1.3 skrll 1251 1.1.1.5 mrg <br><dt><code>--with-libart-exec-prefix=PFX</code><dd>Exec prefix where libart is installed (optional). 1252 1.1.1.3 skrll 1253 1.1.1.5 mrg <br><dt><code>--disable-libarttest</code><dd>Do not try to compile and run a test libart program. 1254 1.1.1.3 skrll 1255 1.1.1.5 mrg </dl> 1256 1.1.1.3 skrll 1257 1.1.1.5 mrg <h5 class="subsubheading"><a name="TOC7"></a>Overriding <samp><span class="command">configure</span></samp> test results</h5> 1258 1.1.1.3 skrll 1259 1.1.1.5 mrg <p>Sometimes, it might be necessary to override the result of some 1260 1.1.1.5 mrg <samp><span class="command">configure</span></samp> test, for example in order to ease porting to a new 1261 1.1.1.5 mrg system or work around a bug in a test. The toplevel <samp><span class="command">configure</span></samp> 1262 1.1.1.5 mrg script provides three variables for this: 1263 1.1.1.3 skrll 1264 1.1.1.5 mrg <dl> 1265 1.1.1.5 mrg <dt><code>build_configargs</code><dd><a name="index-g_t_0040code_007bbuild_005fconfigargs_007d-3"></a>The contents of this variable is passed to all build <samp><span class="command">configure</span></samp> 1266 1.1.1.5 mrg scripts. 1267 1.1.1.5 mrg 1268 1.1.1.5 mrg <br><dt><code>host_configargs</code><dd><a name="index-g_t_0040code_007bhost_005fconfigargs_007d-4"></a>The contents of this variable is passed to all host <samp><span class="command">configure</span></samp> 1269 1.1.1.5 mrg scripts. 1270 1.1.1.5 mrg 1271 1.1.1.5 mrg <br><dt><code>target_configargs</code><dd><a name="index-g_t_0040code_007btarget_005fconfigargs_007d-5"></a>The contents of this variable is passed to all target <samp><span class="command">configure</span></samp> 1272 1.1.1.5 mrg scripts. 1273 1.1.1.5 mrg 1274 1.1.1.5 mrg </dl> 1275 1.1.1.5 mrg 1276 1.1.1.5 mrg <p>In order to avoid shell and <samp><span class="command">make</span></samp> quoting issues for complex 1277 1.1.1.5 mrg overrides, you can pass a setting for <samp><span class="env">CONFIG_SITE</span></samp> and set 1278 1.1.1.5 mrg variables in the site file. 1279 1.1.1.3 skrll 1280 1.1.1.5 mrg <p><hr /> 1281 1.1.1.5 mrg <p><a href="./index.html">Return to the GCC Installation page</a> 1282 1.1 mrg 1283 1.1.1.5 mrg <!-- ***Building**************************************************************** --> 1284 1.1.1.5 mrg <!-- ***Testing***************************************************************** --> 1285 1.1.1.5 mrg <!-- ***Final install*********************************************************** --> 1286 1.1.1.5 mrg <!-- ***Binaries**************************************************************** --> 1287 1.1.1.5 mrg <!-- ***Specific**************************************************************** --> 1288 1.1.1.5 mrg <!-- ***Old documentation****************************************************** --> 1289 1.1.1.5 mrg <!-- ***GFDL******************************************************************** --> 1290 1.1.1.5 mrg <!-- *************************************************************************** --> 1291 1.1.1.5 mrg <!-- Part 6 The End of the Document --> 1292 1.1.1.5 mrg </body></html> 1293 1.1 mrg 1294
Indexes created Thu Jul 16 00:26:27 UTC 2026