configure.html revision 1.1.1.1.2.1
1 <html lang="en"> 2 <head> 3 <title>Installing GCC: Configuration</title> 4 <meta http-equiv="Content-Type" content="text/html"> 5 <meta name="description" content="Installing GCC: Configuration"> 6 <meta name="generator" content="makeinfo 4.12"> 7 <link title="Top" rel="top" href="#Top"> 8 <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> 9 <!-- 10 Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 11 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 12 2009, 2010, 2011 Free Software Foundation, Inc. 13 14 Permission is granted to copy, distribute and/or modify this document 15 under the terms of the GNU Free Documentation License, Version 1.2 or 16 any later version published by the Free Software Foundation; with no 17 Invariant Sections, the Front-Cover texts being (a) (see below), and 18 with the Back-Cover Texts being (b) (see below). A copy of the 19 license is included in the section entitled "GNU Free Documentation License". 20 21 (a) The FSF's Front-Cover Text is: 22 23 A GNU Manual 24 25 (b) The FSF's Back-Cover Text is: 26 27 You have freedom to copy and modify this GNU Manual, like GNU 28 software. Copies published by the Free Software Foundation raise 29 funds for GNU development.--> 30 <meta http-equiv="Content-Style-Type" content="text/css"> 31 <style type="text/css"><!-- 32 pre.display { font-family:inherit } 33 pre.format { font-family:inherit } 34 pre.smalldisplay { font-family:inherit; font-size:smaller } 35 pre.smallformat { font-family:inherit; font-size:smaller } 36 pre.smallexample { font-size:smaller } 37 pre.smalllisp { font-size:smaller } 38 span.sc { font-variant:small-caps } 39 span.roman { font-family:serif; font-weight:normal; } 40 span.sansserif { font-family:sans-serif; font-weight:normal; } 41 --></style> 42 </head> 43 <body> 44 <h1 class="settitle">Installing GCC: Configuration</h1> 45 <a name="index-Configuration-1"></a><a name="index-Installing-GCC_003a-Configuration-2"></a> 46 Like most GNU software, GCC must be configured before it can be built. 47 This document describes the recommended configuration procedure 48 for both native and cross targets. 49 50 <p>We use <var>srcdir</var> to refer to the toplevel source directory for 51 GCC; we use <var>objdir</var> to refer to the toplevel build/object directory. 52 53 <p>If you obtained the sources via SVN, <var>srcdir</var> must refer to the top 54 <samp><span class="file">gcc</span></samp> directory, the one where the <samp><span class="file">MAINTAINERS</span></samp> file can be 55 found, and not its <samp><span class="file">gcc</span></samp> subdirectory, otherwise the build will fail. 56 57 <p>If either <var>srcdir</var> or <var>objdir</var> is located on an automounted NFS 58 file system, the shell's built-in <samp><span class="command">pwd</span></samp> command will return 59 temporary pathnames. Using these can lead to various sorts of build 60 problems. To avoid this issue, set the <samp><span class="env">PWDCMD</span></samp> environment 61 variable to an automounter-aware <samp><span class="command">pwd</span></samp> command, e.g., 62 <samp><span class="command">pawd</span></samp> or ‘<samp><span class="samp">amq -w</span></samp>’, during the configuration and build 63 phases. 64 65 <p>First, we <strong>highly</strong> recommend that GCC be built into a 66 separate directory from the sources which does <strong>not</strong> reside 67 within the source tree. This is how we generally build GCC; building 68 where <var>srcdir</var> == <var>objdir</var> should still work, but doesn't 69 get extensive testing; building where <var>objdir</var> is a subdirectory 70 of <var>srcdir</var> is unsupported. 71 72 <p>If you have previously built GCC in the same directory for a 73 different target machine, do ‘<samp><span class="samp">make distclean</span></samp>’ to delete all files 74 that might be invalid. One of the files this deletes is <samp><span class="file">Makefile</span></samp>; 75 if ‘<samp><span class="samp">make distclean</span></samp>’ complains that <samp><span class="file">Makefile</span></samp> does not exist 76 or issues a message like “don't know how to make distclean” it probably 77 means that the directory is already suitably clean. However, with the 78 recommended method of building in a separate <var>objdir</var>, you should 79 simply use a different <var>objdir</var> for each target. 80 81 <p>Second, when configuring a native system, either <samp><span class="command">cc</span></samp> or 82 <samp><span class="command">gcc</span></samp> must be in your path or you must set <samp><span class="env">CC</span></samp> in 83 your environment before running configure. Otherwise the configuration 84 scripts may fail. 85 86 <p>To configure GCC: 87 88 <pre class="smallexample"> % mkdir <var>objdir</var> 89 % cd <var>objdir</var> 90 % <var>srcdir</var>/configure [<var>options</var>] [<var>target</var>] 91 </pre> 92 <h3 class="heading"><a name="TOC0"></a>Distributor options</h3> 93 94 <p>If you will be distributing binary versions of GCC, with modifications 95 to the source code, you should use the options described in this 96 section to make clear that your version contains modifications. 97 98 <dl> 99 <dt><code>--with-pkgversion=</code><var>version</var><dd>Specify a string that identifies your package. You may wish 100 to include a build number or build date. This version string will be 101 included in the output of <samp><span class="command">gcc --version</span></samp>. This suffix does 102 not replace the default version string, only the ‘<samp><span class="samp">GCC</span></samp>’ part. 103 104 <p>The default value is ‘<samp><span class="samp">GCC</span></samp>’. 105 106 <br><dt><code>--with-bugurl=</code><var>url</var><dd>Specify the URL that users should visit if they wish to report a bug. 107 You are of course welcome to forward bugs reported to you to the FSF, 108 if you determine that they are not bugs in your modifications. 109 110 <p>The default value refers to the FSF's GCC bug tracker. 111 112 </dl> 113 114 <h3 class="heading"><a name="TOC1"></a>Target specification</h3> 115 116 <ul> 117 <li>GCC has code to correctly determine the correct value for <var>target</var> 118 for nearly all native systems. Therefore, we highly recommend you do 119 not provide a configure target when configuring a native compiler. 120 121 <li><var>target</var> must be specified as <samp><span class="option">--target=</span><var>target</var></samp> 122 when configuring a cross compiler; examples of valid targets would be 123 m68k-elf, sh-elf, etc. 124 125 <li>Specifying just <var>target</var> instead of <samp><span class="option">--target=</span><var>target</var></samp> 126 implies that the host defaults to <var>target</var>. 127 </ul> 128 129 <h3 class="heading"><a name="TOC2"></a>Options specification</h3> 130 131 <p>Use <var>options</var> to override several configure time options for 132 GCC. A list of supported <var>options</var> follows; ‘<samp><span class="samp">configure 133 --help</span></samp>’ may list other options, but those not listed below may not 134 work and should not normally be used. 135 136 <p>Note that each <samp><span class="option">--enable</span></samp> option has a corresponding 137 <samp><span class="option">--disable</span></samp> option and that each <samp><span class="option">--with</span></samp> option has a 138 corresponding <samp><span class="option">--without</span></samp> option. 139 140 <dl> 141 <dt><code>--prefix=</code><var>dirname</var><dd>Specify the toplevel installation 142 directory. This is the recommended way to install the tools into a directory 143 other than the default. The toplevel installation directory defaults to 144 <samp><span class="file">/usr/local</span></samp>. 145 146 <p>We <strong>highly</strong> recommend against <var>dirname</var> being the same or a 147 subdirectory of <var>objdir</var> or vice versa. If specifying a directory 148 beneath a user's home directory tree, some shells will not expand 149 <var>dirname</var> correctly if it contains the ‘<samp><span class="samp">~</span></samp>’ metacharacter; use 150 <samp><span class="env">$HOME</span></samp> instead. 151 152 <p>The following standard <samp><span class="command">autoconf</span></samp> options are supported. Normally you 153 should not need to use these options. 154 <dl> 155 <dt><code>--exec-prefix=</code><var>dirname</var><dd>Specify the toplevel installation directory for architecture-dependent 156 files. The default is <samp><var>prefix</var></samp>. 157 158 <br><dt><code>--bindir=</code><var>dirname</var><dd>Specify the installation directory for the executables called by users 159 (such as <samp><span class="command">gcc</span></samp> and <samp><span class="command">g++</span></samp>). The default is 160 <samp><var>exec-prefix</var><span class="file">/bin</span></samp>. 161 162 <br><dt><code>--libdir=</code><var>dirname</var><dd>Specify the installation directory for object code libraries and 163 internal data files of GCC. The default is <samp><var>exec-prefix</var><span class="file">/lib</span></samp>. 164 165 <br><dt><code>--libexecdir=</code><var>dirname</var><dd>Specify the installation directory for internal executables of GCC. 166 The default is <samp><var>exec-prefix</var><span class="file">/libexec</span></samp>. 167 168 <br><dt><code>--with-slibdir=</code><var>dirname</var><dd>Specify the installation directory for the shared libgcc library. The 169 default is <samp><var>libdir</var></samp>. 170 171 <br><dt><code>--datarootdir=</code><var>dirname</var><dd>Specify the root of the directory tree for read-only architecture-independent 172 data files referenced by GCC. The default is <samp><var>prefix</var><span class="file">/share</span></samp>. 173 174 <br><dt><code>--infodir=</code><var>dirname</var><dd>Specify the installation directory for documentation in info format. 175 The default is <samp><var>datarootdir</var><span class="file">/info</span></samp>. 176 177 <br><dt><code>--datadir=</code><var>dirname</var><dd>Specify the installation directory for some architecture-independent 178 data files referenced by GCC. The default is <samp><var>datarootdir</var></samp>. 179 180 <br><dt><code>--docdir=</code><var>dirname</var><dd>Specify the installation directory for documentation files (other 181 than Info) for GCC. The default is <samp><var>datarootdir</var><span class="file">/doc</span></samp>. 182 183 <br><dt><code>--htmldir=</code><var>dirname</var><dd>Specify the installation directory for HTML documentation files. 184 The default is <samp><var>docdir</var></samp>. 185 186 <br><dt><code>--pdfdir=</code><var>dirname</var><dd>Specify the installation directory for PDF documentation files. 187 The default is <samp><var>docdir</var></samp>. 188 189 <br><dt><code>--mandir=</code><var>dirname</var><dd>Specify the installation directory for manual pages. The default is 190 <samp><var>datarootdir</var><span class="file">/man</span></samp>. (Note that the manual pages are only extracts 191 from the full GCC manuals, which are provided in Texinfo format. The manpages 192 are derived by an automatic conversion process from parts of the full 193 manual.) 194 195 <br><dt><code>--with-gxx-include-dir=</code><var>dirname</var><dd>Specify 196 the installation directory for G++ header files. The default depends 197 on other configuration options, and differs between cross and native 198 configurations. 199 200 </dl> 201 202 <br><dt><code>--program-prefix=</code><var>prefix</var><dd>GCC supports some transformations of the names of its programs when 203 installing them. This option prepends <var>prefix</var> to the names of 204 programs to install in <var>bindir</var> (see above). For example, specifying 205 <samp><span class="option">--program-prefix=foo-</span></samp> would result in ‘<samp><span class="samp">gcc</span></samp>’ 206 being installed as <samp><span class="file">/usr/local/bin/foo-gcc</span></samp>. 207 208 <br><dt><code>--program-suffix=</code><var>suffix</var><dd>Appends <var>suffix</var> to the names of programs to install in <var>bindir</var> 209 (see above). For example, specifying <samp><span class="option">--program-suffix=-3.1</span></samp> 210 would result in ‘<samp><span class="samp">gcc</span></samp>’ being installed as 211 <samp><span class="file">/usr/local/bin/gcc-3.1</span></samp>. 212 213 <br><dt><code>--program-transform-name=</code><var>pattern</var><dd>Applies the ‘<samp><span class="samp">sed</span></samp>’ script <var>pattern</var> to be applied to the names 214 of programs to install in <var>bindir</var> (see above). <var>pattern</var> has to 215 consist of one or more basic ‘<samp><span class="samp">sed</span></samp>’ editing commands, separated by 216 semicolons. For example, if you want the ‘<samp><span class="samp">gcc</span></samp>’ program name to be 217 transformed to the installed program <samp><span class="file">/usr/local/bin/myowngcc</span></samp> and 218 the ‘<samp><span class="samp">g++</span></samp>’ program name to be transformed to 219 <samp><span class="file">/usr/local/bin/gspecial++</span></samp> without changing other program names, 220 you could use the pattern 221 <samp><span class="option">--program-transform-name='s/^gcc$/myowngcc/; s/^g++$/gspecial++/'</span></samp> 222 to achieve this effect. 223 224 <p>All three options can be combined and used together, resulting in more 225 complex conversion patterns. As a basic rule, <var>prefix</var> (and 226 <var>suffix</var>) are prepended (appended) before further transformations 227 can happen with a special transformation script <var>pattern</var>. 228 229 <p>As currently implemented, this option only takes effect for native 230 builds; cross compiler binaries' names are not transformed even when a 231 transformation is explicitly asked for by one of these options. 232 233 <p>For native builds, some of the installed programs are also installed 234 with the target alias in front of their name, as in 235 ‘<samp><span class="samp">i686-pc-linux-gnu-gcc</span></samp>’. All of the above transformations happen 236 before the target alias is prepended to the name—so, specifying 237 <samp><span class="option">--program-prefix=foo-</span></samp> and <samp><span class="option">program-suffix=-3.1</span></samp>, the 238 resulting binary would be installed as 239 <samp><span class="file">/usr/local/bin/i686-pc-linux-gnu-foo-gcc-3.1</span></samp>. 240 241 <p>As a last shortcoming, none of the installed Ada programs are 242 transformed yet, which will be fixed in some time. 243 244 <br><dt><code>--with-local-prefix=</code><var>dirname</var><dd>Specify the 245 installation directory for local include files. The default is 246 <samp><span class="file">/usr/local</span></samp>. Specify this option if you want the compiler to 247 search directory <samp><var>dirname</var><span class="file">/include</span></samp> for locally installed 248 header files <em>instead</em> of <samp><span class="file">/usr/local/include</span></samp>. 249 250 <p>You should specify <samp><span class="option">--with-local-prefix</span></samp> <strong>only</strong> if your 251 site has a different convention (not <samp><span class="file">/usr/local</span></samp>) for where to put 252 site-specific files. 253 254 <p>The default value for <samp><span class="option">--with-local-prefix</span></samp> is <samp><span class="file">/usr/local</span></samp> 255 regardless of the value of <samp><span class="option">--prefix</span></samp>. Specifying 256 <samp><span class="option">--prefix</span></samp> has no effect on which directory GCC searches for 257 local header files. This may seem counterintuitive, but actually it is 258 logical. 259 260 <p>The purpose of <samp><span class="option">--prefix</span></samp> is to specify where to <em>install 261 GCC</em>. The local header files in <samp><span class="file">/usr/local/include</span></samp>—if you put 262 any in that directory—are not part of GCC. They are part of other 263 programs—perhaps many others. (GCC installs its own header files in 264 another directory which is based on the <samp><span class="option">--prefix</span></samp> value.) 265 266 <p>Both the local-prefix include directory and the GCC-prefix include 267 directory are part of GCC's “system include” directories. Although these 268 two directories are not fixed, they need to be searched in the proper 269 order for the correct processing of the include_next directive. The 270 local-prefix include directory is searched before the GCC-prefix 271 include directory. Another characteristic of system include directories 272 is that pedantic warnings are turned off for headers in these directories. 273 274 <p>Some autoconf macros add <samp><span class="option">-I </span><var>directory</var></samp> options to the 275 compiler command line, to ensure that directories containing installed 276 packages' headers are searched. When <var>directory</var> is one of GCC's 277 system include directories, GCC will ignore the option so that system 278 directories continue to be processed in the correct order. This 279 may result in a search order different from what was specified but the 280 directory will still be searched. 281 282 <p>GCC automatically searches for ordinary libraries using 283 <samp><span class="env">GCC_EXEC_PREFIX</span></samp>. Thus, when the same installation prefix is 284 used for both GCC and packages, GCC will automatically search for 285 both headers and libraries. This provides a configuration that is 286 easy to use. GCC behaves in a manner similar to that when it is 287 installed as a system compiler in <samp><span class="file">/usr</span></samp>. 288 289 <p>Sites that need to install multiple versions of GCC may not want to 290 use the above simple configuration. It is possible to use the 291 <samp><span class="option">--program-prefix</span></samp>, <samp><span class="option">--program-suffix</span></samp> and 292 <samp><span class="option">--program-transform-name</span></samp> options to install multiple versions 293 into a single directory, but it may be simpler to use different prefixes 294 and the <samp><span class="option">--with-local-prefix</span></samp> option to specify the location of the 295 site-specific files for each version. It will then be necessary for 296 users to specify explicitly the location of local site libraries 297 (e.g., with <samp><span class="env">LIBRARY_PATH</span></samp>). 298 299 <p>The same value can be used for both <samp><span class="option">--with-local-prefix</span></samp> and 300 <samp><span class="option">--prefix</span></samp> provided it is not <samp><span class="file">/usr</span></samp>. This can be used 301 to avoid the default search of <samp><span class="file">/usr/local/include</span></samp>. 302 303 <p><strong>Do not</strong> specify <samp><span class="file">/usr</span></samp> as the <samp><span class="option">--with-local-prefix</span></samp>! 304 The directory you use for <samp><span class="option">--with-local-prefix</span></samp> <strong>must not</strong> 305 contain any of the system's standard header files. If it did contain 306 them, certain programs would be miscompiled (including GNU Emacs, on 307 certain targets), because this would override and nullify the header 308 file corrections made by the <samp><span class="command">fixincludes</span></samp> script. 309 310 <p>Indications are that people who use this option use it based on mistaken 311 ideas of what it is for. People use it as if it specified where to 312 install part of GCC. Perhaps they make this assumption because 313 installing GCC creates the directory. 314 315 <br><dt><code>--enable-shared[=</code><var>package</var><code>[,...]]</code><dd>Build shared versions of libraries, if shared libraries are supported on 316 the target platform. Unlike GCC 2.95.x and earlier, shared libraries 317 are enabled by default on all platforms that support shared libraries. 318 319 <p>If a list of packages is given as an argument, build shared libraries 320 only for the listed packages. For other packages, only static libraries 321 will be built. Package names currently recognized in the GCC tree are 322 ‘<samp><span class="samp">libgcc</span></samp>’ (also known as ‘<samp><span class="samp">gcc</span></samp>’), ‘<samp><span class="samp">libstdc++</span></samp>’ (not 323 ‘<samp><span class="samp">libstdc++-v3</span></samp>’), ‘<samp><span class="samp">libffi</span></samp>’, ‘<samp><span class="samp">zlib</span></samp>’, ‘<samp><span class="samp">boehm-gc</span></samp>’, 324 ‘<samp><span class="samp">ada</span></samp>’, ‘<samp><span class="samp">libada</span></samp>’, ‘<samp><span class="samp">libjava</span></samp>’ and ‘<samp><span class="samp">libobjc</span></samp>’. 325 Note ‘<samp><span class="samp">libiberty</span></samp>’ does not support shared libraries at all. 326 327 <p>Use <samp><span class="option">--disable-shared</span></samp> to build only static libraries. Note that 328 <samp><span class="option">--disable-shared</span></samp> does not accept a list of package names as 329 argument, only <samp><span class="option">--enable-shared</span></samp> does. 330 331 <br><dt><code><a name="with_002dgnu_002das"></a>--with-gnu-as</code><dd>Specify that the compiler should assume that the 332 assembler it finds is the GNU assembler. However, this does not modify 333 the rules to find an assembler and will result in confusion if the 334 assembler found is not actually the GNU assembler. (Confusion may also 335 result if the compiler finds the GNU assembler but has not been 336 configured with <samp><span class="option">--with-gnu-as</span></samp>.) If you have more than one 337 assembler installed on your system, you may want to use this option in 338 connection with <samp><span class="option">--with-as=</span><var>pathname</var></samp> or 339 <samp><span class="option">--with-build-time-tools=</span><var>pathname</var></samp>. 340 341 <p>The following systems are the only ones where it makes a difference 342 whether you use the GNU assembler. On any other system, 343 <samp><span class="option">--with-gnu-as</span></samp> has no effect. 344 345 <ul> 346 <li>‘<samp><span class="samp">hppa1.0-</span><var>any</var><span class="samp">-</span><var>any</var></samp>’ 347 <li>‘<samp><span class="samp">hppa1.1-</span><var>any</var><span class="samp">-</span><var>any</var></samp>’ 348 <li>‘<samp><span class="samp">sparc-sun-solaris2.</span><var>any</var></samp>’ 349 <li>‘<samp><span class="samp">sparc64-</span><var>any</var><span class="samp">-solaris2.</span><var>any</var></samp>’ 350 </ul> 351 352 <br><dt><code><a name="with_002das"></a>--with-as=</code><var>pathname</var><dd>Specify that the compiler should use the assembler pointed to by 353 <var>pathname</var>, rather than the one found by the standard rules to find 354 an assembler, which are: 355 <ul> 356 <li>Unless GCC is being built with a cross compiler, check the 357 <samp><var>libexec</var><span class="file">/gcc/</span><var>target</var><span class="file">/</span><var>version</var></samp> directory. 358 <var>libexec</var> defaults to <samp><var>exec-prefix</var><span class="file">/libexec</span></samp>; 359 <var>exec-prefix</var> defaults to <var>prefix</var>, which 360 defaults to <samp><span class="file">/usr/local</span></samp> unless overridden by the 361 <samp><span class="option">--prefix=</span><var>pathname</var></samp> switch described above. <var>target</var> 362 is the target system triple, such as ‘<samp><span class="samp">sparc-sun-solaris2.7</span></samp>’, and 363 <var>version</var> denotes the GCC version, such as 3.0. 364 365 <li>If the target system is the same that you are building on, check 366 operating system specific directories (e.g. <samp><span class="file">/usr/ccs/bin</span></samp> on 367 Sun Solaris 2). 368 369 <li>Check in the <samp><span class="env">PATH</span></samp> for a tool whose name is prefixed by the 370 target system triple. 371 372 <li>Check in the <samp><span class="env">PATH</span></samp> for a tool whose name is not prefixed by the 373 target system triple, if the host and target system triple are 374 the same (in other words, we use a host tool if it can be used for 375 the target as well). 376 </ul> 377 378 <p>You may want to use <samp><span class="option">--with-as</span></samp> if no assembler 379 is installed in the directories listed above, or if you have multiple 380 assemblers installed and want to choose one that is not found by the 381 above rules. 382 383 <br><dt><code><a name="with_002dgnu_002dld"></a>--with-gnu-ld</code><dd>Same as <a href="#with-gnu-as"><samp><span class="option">--with-gnu-as</span></samp></a> 384 but for the linker. 385 386 <br><dt><code>--with-ld=</code><var>pathname</var><dd>Same as <a href="#with-as"><samp><span class="option">--with-as</span></samp></a> 387 but for the linker. 388 389 <br><dt><code>--with-stabs</code><dd>Specify that stabs debugging 390 information should be used instead of whatever format the host normally 391 uses. Normally GCC uses the same debug format as the host system. 392 393 <p>On MIPS based systems and on Alphas, you must specify whether you want 394 GCC to create the normal ECOFF debugging format, or to use BSD-style 395 stabs passed through the ECOFF symbol table. The normal ECOFF debug 396 format cannot fully handle languages other than C. BSD stabs format can 397 handle other languages, but it only works with the GNU debugger GDB. 398 399 <p>Normally, GCC uses the ECOFF debugging format by default; if you 400 prefer BSD stabs, specify <samp><span class="option">--with-stabs</span></samp> when you configure GCC. 401 402 <p>No matter which default you choose when you configure GCC, the user 403 can use the <samp><span class="option">-gcoff</span></samp> and <samp><span class="option">-gstabs+</span></samp> options to specify explicitly 404 the debug format for a particular compilation. 405 406 <p><samp><span class="option">--with-stabs</span></samp> is meaningful on the ISC system on the 386, also, if 407 <samp><span class="option">--with-gas</span></samp> is used. It selects use of stabs debugging 408 information embedded in COFF output. This kind of debugging information 409 supports C++ well; ordinary COFF debugging information does not. 410 411 <p><samp><span class="option">--with-stabs</span></samp> is also meaningful on 386 systems running SVR4. It 412 selects use of stabs debugging information embedded in ELF output. The 413 C++ compiler currently (2.6.0) does not support the DWARF debugging 414 information normally used on 386 SVR4 platforms; stabs provide a 415 workable alternative. This requires gas and gdb, as the normal SVR4 416 tools can not generate or interpret stabs. 417 418 <br><dt><code>--disable-multilib</code><dd>Specify that multiple target 419 libraries to support different target variants, calling 420 conventions, etc. should not be built. The default is to build a 421 predefined set of them. 422 423 <p>Some targets provide finer-grained control over which multilibs are built 424 (e.g., <samp><span class="option">--disable-softfloat</span></samp>): 425 <dl> 426 <dt><code>arc-*-elf*</code><dd>biendian. 427 428 <br><dt><code>arm-*-*</code><dd>fpu, 26bit, underscore, interwork, biendian, nofmult. 429 430 <br><dt><code>m68*-*-*</code><dd>softfloat, m68881, m68000, m68020. 431 432 <br><dt><code>mips*-*-*</code><dd>single-float, biendian, softfloat. 433 434 <br><dt><code>powerpc*-*-*, rs6000*-*-*</code><dd>aix64, pthread, softfloat, powercpu, powerpccpu, powerpcos, biendian, 435 sysv, aix. 436 437 </dl> 438 439 <br><dt><code>--with-multilib-list=</code><var>list</var><dt><code>--without-multilib-list</code><dd>Specify what multilibs to build. 440 Currently only implemented for sh*-*-*. 441 442 <p><var>list</var> is a comma separated list of CPU names. These must be of the 443 form <code>sh*</code> or <code>m*</code> (in which case they match the compiler option 444 for that processor). The list should not contain any endian options - 445 these are handled by <samp><span class="option">--with-endian</span></samp>. 446 447 <p>If <var>list</var> is empty, then there will be no multilibs for extra 448 processors. The multilib for the secondary endian remains enabled. 449 450 <p>As a special case, if an entry in the list starts with a <code>!</code> 451 (exclamation point), then it is added to the list of excluded multilibs. 452 Entries of this sort should be compatible with ‘<samp><span class="samp">MULTILIB_EXCLUDES</span></samp>’ 453 (once the leading <code>!</code> has been stripped). 454 455 <p>If <samp><span class="option">--with-multilib-list</span></samp> is not given, then a default set of 456 multilibs is selected based on the value of <samp><span class="option">--target</span></samp>. This is 457 usually the complete set of libraries, but some targets imply a more 458 specialized subset. 459 460 <p>Example 1: to configure a compiler for SH4A only, but supporting both 461 endians, with little endian being the default: 462 <pre class="smallexample"> --with-cpu=sh4a --with-endian=little,big --with-multilib-list= 463 </pre> 464 <p>Example 2: to configure a compiler for both SH4A and SH4AL-DSP, but with 465 only little endian SH4AL: 466 <pre class="smallexample"> --with-cpu=sh4a --with-endian=little,big --with-multilib-list=sh4al,!mb/m4al 467 </pre> 468 <br><dt><code>--with-endian=</code><var>endians</var><dd>Specify what endians to use. 469 Currently only implemented for sh*-*-*. 470 471 <p><var>endians</var> may be one of the following: 472 <dl> 473 <dt><code>big</code><dd>Use big endian exclusively. 474 <br><dt><code>little</code><dd>Use little endian exclusively. 475 <br><dt><code>big,little</code><dd>Use big endian by default. Provide a multilib for little endian. 476 <br><dt><code>little,big</code><dd>Use little endian by default. Provide a multilib for big endian. 477 </dl> 478 479 <br><dt><code>--enable-threads</code><dd>Specify that the target 480 supports threads. This affects the Objective-C compiler and runtime 481 library, and exception handling for other languages like C++ and Java. 482 On some systems, this is the default. 483 484 <p>In general, the best (and, in many cases, the only known) threading 485 model available will be configured for use. Beware that on some 486 systems, GCC has not been taught what threading models are generally 487 available for the system. In this case, <samp><span class="option">--enable-threads</span></samp> is an 488 alias for <samp><span class="option">--enable-threads=single</span></samp>. 489 490 <br><dt><code>--disable-threads</code><dd>Specify that threading support should be disabled for the system. 491 This is an alias for <samp><span class="option">--enable-threads=single</span></samp>. 492 493 <br><dt><code>--enable-threads=</code><var>lib</var><dd>Specify that 494 <var>lib</var> is the thread support library. This affects the Objective-C 495 compiler and runtime library, and exception handling for other languages 496 like C++ and Java. The possibilities for <var>lib</var> are: 497 498 <dl> 499 <dt><code>aix</code><dd>AIX thread support. 500 <br><dt><code>dce</code><dd>DCE thread support. 501 <br><dt><code>gnat</code><dd>Ada tasking support. For non-Ada programs, this setting is equivalent 502 to ‘<samp><span class="samp">single</span></samp>’. When used in conjunction with the Ada run time, it 503 causes GCC to use the same thread primitives as Ada uses. This option 504 is necessary when using both Ada and the back end exception handling, 505 which is the default for most Ada targets. 506 <br><dt><code>mach</code><dd>Generic MACH thread support, known to work on NeXTSTEP. (Please note 507 that the file needed to support this configuration, <samp><span class="file">gthr-mach.h</span></samp>, is 508 missing and thus this setting will cause a known bootstrap failure.) 509 <br><dt><code>no</code><dd>This is an alias for ‘<samp><span class="samp">single</span></samp>’. 510 <br><dt><code>posix</code><dd>Generic POSIX/Unix98 thread support. 511 <br><dt><code>posix95</code><dd>Generic POSIX/Unix95 thread support. 512 <br><dt><code>rtems</code><dd>RTEMS thread support. 513 <br><dt><code>single</code><dd>Disable thread support, should work for all platforms. 514 <br><dt><code>solaris</code><dd>Sun Solaris 2/Unix International thread support. Only use this if you 515 really need to use this legacy API instead of the default, ‘<samp><span class="samp">posix</span></samp>’. 516 <br><dt><code>vxworks</code><dd>VxWorks thread support. 517 <br><dt><code>win32</code><dd>Microsoft Win32 API thread support. 518 <br><dt><code>nks</code><dd>Novell Kernel Services thread support. 519 </dl> 520 521 <br><dt><code>--enable-tls</code><dd>Specify that the target supports TLS (Thread Local Storage). Usually 522 configure can correctly determine if TLS is supported. In cases where 523 it guesses incorrectly, TLS can be explicitly enabled or disabled with 524 <samp><span class="option">--enable-tls</span></samp> or <samp><span class="option">--disable-tls</span></samp>. This can happen if 525 the assembler supports TLS but the C library does not, or if the 526 assumptions made by the configure test are incorrect. 527 528 <br><dt><code>--disable-tls</code><dd>Specify that the target does not support TLS. 529 This is an alias for <samp><span class="option">--enable-tls=no</span></samp>. 530 531 <br><dt><code>--with-cpu=</code><var>cpu</var><dt><code>--with-cpu-32=</code><var>cpu</var><dt><code>--with-cpu-64=</code><var>cpu</var><dd>Specify which cpu variant the compiler should generate code for by default. 532 <var>cpu</var> will be used as the default value of the <samp><span class="option">-mcpu=</span></samp> switch. 533 This option is only supported on some targets, including ARM, i386, M68k, 534 PowerPC, and SPARC. The <samp><span class="option">--with-cpu-32</span></samp> and 535 <samp><span class="option">--with-cpu-64</span></samp> options specify separate default CPUs for 536 32-bit and 64-bit modes; these options are only supported for i386, 537 x86-64 and PowerPC. 538 539 <br><dt><code>--with-schedule=</code><var>cpu</var><dt><code>--with-arch=</code><var>cpu</var><dt><code>--with-arch-32=</code><var>cpu</var><dt><code>--with-arch-64=</code><var>cpu</var><dt><code>--with-tune=</code><var>cpu</var><dt><code>--with-tune-32=</code><var>cpu</var><dt><code>--with-tune-64=</code><var>cpu</var><dt><code>--with-abi=</code><var>abi</var><dt><code>--with-fpu=</code><var>type</var><dt><code>--with-float=</code><var>type</var><dd>These configure options provide default values for the <samp><span class="option">-mschedule=</span></samp>, 540 <samp><span class="option">-march=</span></samp>, <samp><span class="option">-mtune=</span></samp>, <samp><span class="option">-mabi=</span></samp>, and <samp><span class="option">-mfpu=</span></samp> 541 options and for <samp><span class="option">-mhard-float</span></samp> or <samp><span class="option">-msoft-float</span></samp>. As with 542 <samp><span class="option">--with-cpu</span></samp>, which switches will be accepted and acceptable values 543 of the arguments depend on the target. 544 545 <br><dt><code>--with-mode=</code><var>mode</var><dd>Specify if the compiler should default to <samp><span class="option">-marm</span></samp> or <samp><span class="option">-mthumb</span></samp>. 546 This option is only supported on ARM targets. 547 548 <br><dt><code>--with-fpmath=sse</code><dd>Specify if the compiler should default to <samp><span class="option">-msse2</span></samp> and 549 <samp><span class="option">-mfpmath=sse</span></samp>. This option is only supported on i386 and 550 x86-64 targets. 551 552 <br><dt><code>--with-divide=</code><var>type</var><dd>Specify how the compiler should generate code for checking for 553 division by zero. This option is only supported on the MIPS target. 554 The possibilities for <var>type</var> are: 555 <dl> 556 <dt><code>traps</code><dd>Division by zero checks use conditional traps (this is the default on 557 systems that support conditional traps). 558 <br><dt><code>breaks</code><dd>Division by zero checks use the break instruction. 559 </dl> 560 561 <!-- If you make -with-llsc the default for additional targets, --> 562 <!-- update the -with-llsc description in the MIPS section below. --> 563 <br><dt><code>--with-llsc</code><dd>On MIPS targets, make <samp><span class="option">-mllsc</span></samp> the default when no 564 <samp><span class="option">-mno-llsc</span></samp> option is passed. This is the default for 565 Linux-based targets, as the kernel will emulate them if the ISA does 566 not provide them. 567 568 <br><dt><code>--without-llsc</code><dd>On MIPS targets, make <samp><span class="option">-mno-llsc</span></samp> the default when no 569 <samp><span class="option">-mllsc</span></samp> option is passed. 570 571 <br><dt><code>--with-synci</code><dd>On MIPS targets, make <samp><span class="option">-msynci</span></samp> the default when no 572 <samp><span class="option">-mno-synci</span></samp> option is passed. 573 574 <br><dt><code>--without-synci</code><dd>On MIPS targets, make <samp><span class="option">-mno-synci</span></samp> the default when no 575 <samp><span class="option">-msynci</span></samp> option is passed. This is the default. 576 577 <br><dt><code>--with-mips-plt</code><dd>On MIPS targets, make use of copy relocations and PLTs. 578 These features are extensions to the traditional 579 SVR4-based MIPS ABIs and require support from GNU binutils 580 and the runtime C library. 581 582 <br><dt><code>--enable-__cxa_atexit</code><dd>Define if you want to use __cxa_atexit, rather than atexit, to 583 register C++ destructors for local statics and global objects. 584 This is essential for fully standards-compliant handling of 585 destructors, but requires __cxa_atexit in libc. This option is currently 586 only available on systems with GNU libc. When enabled, this will cause 587 <samp><span class="option">-fuse-cxa-atexit</span></samp> to be passed by default. 588 589 <br><dt><code>--enable-target-optspace</code><dd>Specify that target 590 libraries should be optimized for code space instead of code speed. 591 This is the default for the m32r platform. 592 593 <br><dt><code>--with-cpp-install-dir=</code><var>dirname</var><dd>Specify that the user visible <samp><span class="command">cpp</span></samp> program should be installed 594 in <samp><var>prefix</var><span class="file">/</span><var>dirname</var><span class="file">/cpp</span></samp>, in addition to <var>bindir</var>. 595 596 <br><dt><code>--enable-comdat</code><dd>Enable COMDAT group support. This is primarily used to override the 597 automatically detected value. 598 599 <br><dt><code>--enable-initfini-array</code><dd>Force the use of sections <code>.init_array</code> and <code>.fini_array</code> 600 (instead of <code>.init</code> and <code>.fini</code>) for constructors and 601 destructors. Option <samp><span class="option">--disable-initfini-array</span></samp> has the 602 opposite effect. If neither option is specified, the configure script 603 will try to guess whether the <code>.init_array</code> and 604 <code>.fini_array</code> sections are supported and, if they are, use them. 605 606 <br><dt><code>--enable-build-with-cxx</code><dd>Build GCC using a C++ compiler rather than a C compiler. This is an 607 experimental option which may become the default in a later release. 608 609 <br><dt><code>--enable-maintainer-mode</code><dd>The build rules that regenerate the Autoconf and Automake output files as 610 well as the GCC master message catalog <samp><span class="file">gcc.pot</span></samp> are normally 611 disabled. This is because it can only be rebuilt if the complete source 612 tree is present. If you have changed the sources and want to rebuild the 613 catalog, configuring with <samp><span class="option">--enable-maintainer-mode</span></samp> will enable 614 this. Note that you need a recent version of the <code>gettext</code> tools 615 to do so. 616 617 <br><dt><code>--disable-bootstrap</code><dd>For a native build, the default configuration is to perform 618 a 3-stage bootstrap of the compiler when ‘<samp><span class="samp">make</span></samp>’ is invoked, 619 testing that GCC can compile itself correctly. If you want to disable 620 this process, you can configure with <samp><span class="option">--disable-bootstrap</span></samp>. 621 622 <br><dt><code>--enable-bootstrap</code><dd>In special cases, you may want to perform a 3-stage build 623 even if the target and host triplets are different. 624 This is possible when the host can run code compiled for 625 the target (e.g. host is i686-linux, target is i486-linux). 626 Starting from GCC 4.2, to do this you have to configure explicitly 627 with <samp><span class="option">--enable-bootstrap</span></samp>. 628 629 <br><dt><code>--enable-generated-files-in-srcdir</code><dd>Neither the .c and .h files that are generated from Bison and flex nor the 630 info manuals and man pages that are built from the .texi files are present 631 in the SVN development tree. When building GCC from that development tree, 632 or from one of our snapshots, those generated files are placed in your 633 build directory, which allows for the source to be in a readonly 634 directory. 635 636 <p>If you configure with <samp><span class="option">--enable-generated-files-in-srcdir</span></samp> then those 637 generated files will go into the source directory. This is mainly intended 638 for generating release or prerelease tarballs of the GCC sources, since it 639 is not a requirement that the users of source releases to have flex, Bison, 640 or makeinfo. 641 642 <br><dt><code>--enable-version-specific-runtime-libs</code><dd>Specify 643 that runtime libraries should be installed in the compiler specific 644 subdirectory (<samp><var>libdir</var><span class="file">/gcc</span></samp>) rather than the usual places. In 645 addition, ‘<samp><span class="samp">libstdc++</span></samp>’'s include files will be installed into 646 <samp><var>libdir</var></samp> unless you overruled it by using 647 <samp><span class="option">--with-gxx-include-dir=</span><var>dirname</var></samp>. Using this option is 648 particularly useful if you intend to use several versions of GCC in 649 parallel. This is currently supported by ‘<samp><span class="samp">libgfortran</span></samp>’, 650 ‘<samp><span class="samp">libjava</span></samp>’, ‘<samp><span class="samp">libmudflap</span></samp>’, ‘<samp><span class="samp">libstdc++</span></samp>’, and ‘<samp><span class="samp">libobjc</span></samp>’. 651 652 <br><dt><code>--enable-languages=</code><var>lang1</var><code>,</code><var>lang2</var><code>,...</code><dd>Specify that only a particular subset of compilers and 653 their runtime libraries should be built. For a list of valid values for 654 <var>langN</var> you can issue the following command in the 655 <samp><span class="file">gcc</span></samp> directory of your GCC source tree:<br> 656 <pre class="smallexample"> grep language= */config-lang.in 657 </pre> 658 <p>Currently, you can use any of the following: 659 <code>all</code>, <code>ada</code>, <code>c</code>, <code>c++</code>, <code>fortran</code>, <code>java</code>, 660 <code>objc</code>, <code>obj-c++</code>. 661 Building the Ada compiler has special requirements, see below. 662 If you do not pass this flag, or specify the option <code>all</code>, then all 663 default languages available in the <samp><span class="file">gcc</span></samp> sub-tree will be configured. 664 Ada and Objective-C++ are not default languages; the rest are. 665 Re-defining <code>LANGUAGES</code> when calling ‘<samp><span class="samp">make</span></samp>’ <strong>does not</strong> 666 work anymore, as those language sub-directories might not have been 667 configured! 668 669 <br><dt><code>--enable-stage1-languages=</code><var>lang1</var><code>,</code><var>lang2</var><code>,...</code><dd>Specify that a particular subset of compilers and their runtime 670 libraries should be built with the system C compiler during stage 1 of 671 the bootstrap process, rather than only in later stages with the 672 bootstrapped C compiler. The list of valid values is the same as for 673 <samp><span class="option">--enable-languages</span></samp>, and the option <code>all</code> will select all 674 of the languages enabled by <samp><span class="option">--enable-languages</span></samp>. This option is 675 primarily useful for GCC development; for instance, when a development 676 version of the compiler cannot bootstrap due to compiler bugs, or when 677 one is debugging front ends other than the C front end. When this 678 option is used, one can then build the target libraries for the 679 specified languages with the stage-1 compiler by using <samp><span class="command">make 680 stage1-bubble all-target</span></samp>, or run the testsuite on the stage-1 compiler 681 for the specified languages using <samp><span class="command">make stage1-start check-gcc</span></samp>. 682 683 <br><dt><code>--disable-libada</code><dd>Specify that the run-time libraries and tools used by GNAT should not 684 be built. This can be useful for debugging, or for compatibility with 685 previous Ada build procedures, when it was required to explicitly 686 do a ‘<samp><span class="samp">make -C gcc gnatlib_and_tools</span></samp>’. 687 688 <br><dt><code>--disable-libssp</code><dd>Specify that the run-time libraries for stack smashing protection 689 should not be built. 690 691 <br><dt><code>--disable-libgomp</code><dd>Specify that the run-time libraries used by GOMP should not be built. 692 693 <br><dt><code>--with-dwarf2</code><dd>Specify that the compiler should 694 use DWARF 2 debugging information as the default. 695 696 <br><dt><code>--enable-targets=all</code><dt><code>--enable-targets=</code><var>target_list</var><dd>Some GCC targets, e.g. powerpc64-linux, build bi-arch compilers. 697 These are compilers that are able to generate either 64-bit or 32-bit 698 code. Typically, the corresponding 32-bit target, e.g. 699 powerpc-linux for powerpc64-linux, only generates 32-bit code. This 700 option enables the 32-bit target to be a bi-arch compiler, which is 701 useful when you want a bi-arch compiler that defaults to 32-bit, and 702 you are building a bi-arch or multi-arch binutils in a combined tree. 703 On mips-linux, this will build a tri-arch compiler (ABI o32/n32/64), 704 defaulted to o32. 705 Currently, this option only affects sparc-linux, powerpc-linux, x86-linux 706 and mips-linux. 707 708 <br><dt><code>--enable-secureplt</code><dd>This option enables <samp><span class="option">-msecure-plt</span></samp> by default for powerpc-linux. 709 See “RS/6000 and PowerPC Options” in the main manual 710 711 <br><dt><code>--enable-cld</code><dd>This option enables <samp><span class="option">-mcld</span></samp> by default for 32-bit x86 targets. 712 See “i386 and x86-64 Options” in the main manual 713 714 <br><dt><code>--enable-win32-registry</code><dt><code>--enable-win32-registry=</code><var>key</var><dt><code>--disable-win32-registry</code><dd>The <samp><span class="option">--enable-win32-registry</span></samp> option enables Microsoft Windows-hosted GCC 715 to look up installations paths in the registry using the following key: 716 717 <pre class="smallexample"> <code>HKEY_LOCAL_MACHINE\SOFTWARE\Free Software Foundation\</code><var>key</var> 718 </pre> 719 <p><var>key</var> defaults to GCC version number, and can be overridden by the 720 <samp><span class="option">--enable-win32-registry=</span><var>key</var></samp> option. Vendors and distributors 721 who use custom installers are encouraged to provide a different key, 722 perhaps one comprised of vendor name and GCC version number, to 723 avoid conflict with existing installations. This feature is enabled 724 by default, and can be disabled by <samp><span class="option">--disable-win32-registry</span></samp> 725 option. This option has no effect on the other hosts. 726 727 <br><dt><code>--nfp</code><dd>Specify that the machine does not have a floating point unit. This 728 option only applies to ‘<samp><span class="samp">m68k-sun-sunos</span><var>n</var></samp>’. On any other 729 system, <samp><span class="option">--nfp</span></samp> has no effect. 730 731 <br><dt><code>--enable-werror</code><dt><code>--disable-werror</code><dt><code>--enable-werror=yes</code><dt><code>--enable-werror=no</code><dd>When you specify this option, it controls whether certain files in the 732 compiler are built with <samp><span class="option">-Werror</span></samp> in bootstrap stage2 and later. 733 If you don't specify it, <samp><span class="option">-Werror</span></samp> is turned on for the main 734 development trunk. However it defaults to off for release branches and 735 final releases. The specific files which get <samp><span class="option">-Werror</span></samp> are 736 controlled by the Makefiles. 737 738 <br><dt><code>--enable-checking</code><dt><code>--enable-checking=</code><var>list</var><dd>When you specify this option, the compiler is built to perform internal 739 consistency checks of the requested complexity. This does not change the 740 generated code, but adds error checking within the compiler. This will 741 slow down the compiler and may only work properly if you are building 742 the compiler with GCC. This is ‘<samp><span class="samp">yes</span></samp>’ by default when building 743 from SVN or snapshots, but ‘<samp><span class="samp">release</span></samp>’ for releases. The default 744 for building the stage1 compiler is ‘<samp><span class="samp">yes</span></samp>’. More control 745 over the checks may be had by specifying <var>list</var>. The categories of 746 checks available are ‘<samp><span class="samp">yes</span></samp>’ (most common checks 747 ‘<samp><span class="samp">assert,misc,tree,gc,rtlflag,runtime</span></samp>’), ‘<samp><span class="samp">no</span></samp>’ (no checks at 748 all), ‘<samp><span class="samp">all</span></samp>’ (all but ‘<samp><span class="samp">valgrind</span></samp>’), ‘<samp><span class="samp">release</span></samp>’ (cheapest 749 checks ‘<samp><span class="samp">assert,runtime</span></samp>’) or ‘<samp><span class="samp">none</span></samp>’ (same as ‘<samp><span class="samp">no</span></samp>’). 750 Individual checks can be enabled with these flags ‘<samp><span class="samp">assert</span></samp>’, 751 ‘<samp><span class="samp">df</span></samp>’, ‘<samp><span class="samp">fold</span></samp>’, ‘<samp><span class="samp">gc</span></samp>’, ‘<samp><span class="samp">gcac</span></samp>’ ‘<samp><span class="samp">misc</span></samp>’, ‘<samp><span class="samp">rtl</span></samp>’, 752 ‘<samp><span class="samp">rtlflag</span></samp>’, ‘<samp><span class="samp">runtime</span></samp>’, ‘<samp><span class="samp">tree</span></samp>’, and ‘<samp><span class="samp">valgrind</span></samp>’. 753 754 <p>The ‘<samp><span class="samp">valgrind</span></samp>’ check requires the external <samp><span class="command">valgrind</span></samp> 755 simulator, available from <a href="http://valgrind.org/">http://valgrind.org/</a>. The 756 ‘<samp><span class="samp">df</span></samp>’, ‘<samp><span class="samp">rtl</span></samp>’, ‘<samp><span class="samp">gcac</span></samp>’ and ‘<samp><span class="samp">valgrind</span></samp>’ checks are very expensive. 757 To disable all checking, ‘<samp><span class="samp">--disable-checking</span></samp>’ or 758 ‘<samp><span class="samp">--enable-checking=none</span></samp>’ must be explicitly requested. Disabling 759 assertions will make the compiler and runtime slightly faster but 760 increase the risk of undetected internal errors causing wrong code to be 761 generated. 762 763 <br><dt><code>--disable-stage1-checking</code><dt><code>--enable-stage1-checking</code><dt><code>--enable-stage1-checking=</code><var>list</var><dd>If no <samp><span class="option">--enable-checking</span></samp> option is specified the stage1 764 compiler will be built with ‘<samp><span class="samp">yes</span></samp>’ checking enabled, otherwise 765 the stage1 checking flags are the same as specified by 766 <samp><span class="option">--enable-checking</span></samp>. To build the stage1 compiler with 767 different checking options use <samp><span class="option">--enable-stage1-checking</span></samp>. 768 The list of checking options is the same as for <samp><span class="option">--enable-checking</span></samp>. 769 If your system is too slow or too small to bootstrap a released compiler 770 with checking for stage1 enabled, you can use ‘<samp><span class="samp">--disable-stage1-checking</span></samp>’ 771 to disable checking for the stage1 compiler. 772 773 <br><dt><code>--enable-coverage</code><dt><code>--enable-coverage=</code><var>level</var><dd>With this option, the compiler is built to collect self coverage 774 information, every time it is run. This is for internal development 775 purposes, and only works when the compiler is being built with gcc. The 776 <var>level</var> argument controls whether the compiler is built optimized or 777 not, values are ‘<samp><span class="samp">opt</span></samp>’ and ‘<samp><span class="samp">noopt</span></samp>’. For coverage analysis you 778 want to disable optimization, for performance analysis you want to 779 enable optimization. When coverage is enabled, the default level is 780 without optimization. 781 782 <br><dt><code>--enable-gather-detailed-mem-stats</code><dd>When this option is specified more detailed information on memory 783 allocation is gathered. This information is printed when using 784 <samp><span class="option">-fmem-report</span></samp>. 785 786 <br><dt><code>--with-gc</code><dt><code>--with-gc=</code><var>choice</var><dd>With this option you can specify the garbage collector implementation 787 used during the compilation process. <var>choice</var> can be one of 788 ‘<samp><span class="samp">page</span></samp>’ and ‘<samp><span class="samp">zone</span></samp>’, where ‘<samp><span class="samp">page</span></samp>’ is the default. 789 790 <br><dt><code>--enable-nls</code><dt><code>--disable-nls</code><dd>The <samp><span class="option">--enable-nls</span></samp> option enables Native Language Support (NLS), 791 which lets GCC output diagnostics in languages other than American 792 English. Native Language Support is enabled by default if not doing a 793 canadian cross build. The <samp><span class="option">--disable-nls</span></samp> option disables NLS. 794 795 <br><dt><code>--with-included-gettext</code><dd>If NLS is enabled, the <samp><span class="option">--with-included-gettext</span></samp> option causes the build 796 procedure to prefer its copy of GNU <samp><span class="command">gettext</span></samp>. 797 798 <br><dt><code>--with-catgets</code><dd>If NLS is enabled, and if the host lacks <code>gettext</code> but has the 799 inferior <code>catgets</code> interface, the GCC build procedure normally 800 ignores <code>catgets</code> and instead uses GCC's copy of the GNU 801 <code>gettext</code> library. The <samp><span class="option">--with-catgets</span></samp> option causes the 802 build procedure to use the host's <code>catgets</code> in this situation. 803 804 <br><dt><code>--with-libiconv-prefix=</code><var>dir</var><dd>Search for libiconv header files in <samp><var>dir</var><span class="file">/include</span></samp> and 805 libiconv library files in <samp><var>dir</var><span class="file">/lib</span></samp>. 806 807 <br><dt><code>--enable-obsolete</code><dd>Enable configuration for an obsoleted system. If you attempt to 808 configure GCC for a system (build, host, or target) which has been 809 obsoleted, and you do not specify this flag, configure will halt with an 810 error message. 811 812 <p>All support for systems which have been obsoleted in one release of GCC 813 is removed entirely in the next major release, unless someone steps 814 forward to maintain the port. 815 816 <br><dt><code>--enable-decimal-float</code><dt><code>--enable-decimal-float=yes</code><dt><code>--enable-decimal-float=no</code><dt><code>--enable-decimal-float=bid</code><dt><code>--enable-decimal-float=dpd</code><dt><code>--disable-decimal-float</code><dd>Enable (or disable) support for the C decimal floating point extension 817 that is in the IEEE 754-2008 standard. This is enabled by default only 818 on PowerPC, i386, and x86_64 GNU/Linux systems. Other systems may also 819 support it, but require the user to specifically enable it. You can 820 optionally control which decimal floating point format is used (either 821 ‘<samp><span class="samp">bid</span></samp>’ or ‘<samp><span class="samp">dpd</span></samp>’). The ‘<samp><span class="samp">bid</span></samp>’ (binary integer decimal) 822 format is default on i386 and x86_64 systems, and the ‘<samp><span class="samp">dpd</span></samp>’ 823 (densely packed decimal) format is default on PowerPC systems. 824 825 <br><dt><code>--enable-fixed-point</code><dt><code>--disable-fixed-point</code><dd>Enable (or disable) support for C fixed-point arithmetic. 826 This option is enabled by default for some targets (such as MIPS) which 827 have hardware-support for fixed-point operations. On other targets, you 828 may enable this option manually. 829 830 <br><dt><code>--with-long-double-128</code><dd>Specify if <code>long double</code> type should be 128-bit by default on selected 831 GNU/Linux architectures. If using <code>--without-long-double-128</code>, 832 <code>long double</code> will be by default 64-bit, the same as <code>double</code> type. 833 When neither of these configure options are used, the default will be 834 128-bit <code>long double</code> when built against GNU C Library 2.4 and later, 835 64-bit <code>long double</code> otherwise. 836 837 <br><dt><code>--with-gmp=</code><var>pathname</var><dt><code>--with-gmp-include=</code><var>pathname</var><dt><code>--with-gmp-lib=</code><var>pathname</var><dt><code>--with-mpfr=</code><var>pathname</var><dt><code>--with-mpfr-include=</code><var>pathname</var><dt><code>--with-mpfr-lib=</code><var>pathname</var><dt><code>--with-mpc=</code><var>pathname</var><dt><code>--with-mpc-include=</code><var>pathname</var><dt><code>--with-mpc-lib=</code><var>pathname</var><dd>If you do not have GMP (the GNU Multiple Precision library), the MPFR 838 library and/or the MPC library installed in a standard location and 839 you want to build GCC, you can explicitly specify the directory where 840 they are installed (‘<samp><span class="samp">--with-gmp=</span><var>gmpinstalldir</var></samp>’, 841 ‘<samp><span class="samp">--with-mpfr=</span><var>mpfrinstalldir</var></samp>’, 842 ‘<samp><span class="samp">--with-mpc=</span><var>mpcinstalldir</var></samp>’). The 843 <samp><span class="option">--with-gmp=</span><var>gmpinstalldir</var></samp> option is shorthand for 844 <samp><span class="option">--with-gmp-lib=</span><var>gmpinstalldir</var><span class="option">/lib</span></samp> and 845 <samp><span class="option">--with-gmp-include=</span><var>gmpinstalldir</var><span class="option">/include</span></samp>. Likewise the 846 <samp><span class="option">--with-mpfr=</span><var>mpfrinstalldir</var></samp> option is shorthand for 847 <samp><span class="option">--with-mpfr-lib=</span><var>mpfrinstalldir</var><span class="option">/lib</span></samp> and 848 <samp><span class="option">--with-mpfr-include=</span><var>mpfrinstalldir</var><span class="option">/include</span></samp>, also the 849 <samp><span class="option">--with-mpc=</span><var>mpcinstalldir</var></samp> option is shorthand for 850 <samp><span class="option">--with-mpc-lib=</span><var>mpcinstalldir</var><span class="option">/lib</span></samp> and 851 <samp><span class="option">--with-mpc-include=</span><var>mpcinstalldir</var><span class="option">/include</span></samp>. If these 852 shorthand assumptions are not correct, you can use the explicit 853 include and lib options directly. 854 855 <br><dt><code>--with-ppl=</code><var>pathname</var><dt><code>--with-ppl-include=</code><var>pathname</var><dt><code>--with-ppl-lib=</code><var>pathname</var><dt><code>--with-cloog=</code><var>pathname</var><dt><code>--with-cloog-include=</code><var>pathname</var><dt><code>--with-cloog-lib=</code><var>pathname</var><dd>If you do not have PPL (the Parma Polyhedra Library) and the CLooG 856 libraries installed in a standard location and you want to build GCC, 857 you can explicitly specify the directory where they are installed 858 (‘<samp><span class="samp">--with-ppl=</span><var>pplinstalldir</var></samp>’, 859 ‘<samp><span class="samp">--with-cloog=</span><var>clooginstalldir</var></samp>’). The 860 <samp><span class="option">--with-ppl=</span><var>pplinstalldir</var></samp> option is shorthand for 861 <samp><span class="option">--with-ppl-lib=</span><var>pplinstalldir</var><span class="option">/lib</span></samp> and 862 <samp><span class="option">--with-ppl-include=</span><var>pplinstalldir</var><span class="option">/include</span></samp>. Likewise the 863 <samp><span class="option">--with-cloog=</span><var>clooginstalldir</var></samp> option is shorthand for 864 <samp><span class="option">--with-cloog-lib=</span><var>clooginstalldir</var><span class="option">/lib</span></samp> and 865 <samp><span class="option">--with-cloog-include=</span><var>clooginstalldir</var><span class="option">/include</span></samp>. If these 866 shorthand assumptions are not correct, you can use the explicit 867 include and lib options directly. 868 869 <br><dt><code>--with-host-libstdcxx=</code><var>linker-args</var><dd>If you are linking with a static copy of PPL, you can use this option 870 to specify how the linker should find the standard C++ library used 871 internally by PPL. Typical values of <var>linker-args</var> might be 872 ‘<samp><span class="samp">-lstdc++</span></samp>’ or ‘<samp><span class="samp">-Wl,-Bstatic,-lstdc++,-Bdynamic -lm</span></samp>’. If you are 873 linking with a shared copy of PPL, you probably do not need this 874 option; shared library dependencies will cause the linker to search 875 for the standard C++ library automatically. 876 877 <br><dt><code>--with-stage1-ldflags=</code><var>flags</var><dd>This option may be used to set linker flags to be used when linking 878 stage 1 of GCC. These are also used when linking GCC if configured with 879 <samp><span class="option">--disable-bootstrap</span></samp>. By default no special flags are used. 880 881 <br><dt><code>--with-stage1-libs=</code><var>libs</var><dd>This option may be used to set libraries to be used when linking stage 1 882 of GCC. These are also used when linking GCC if configured with 883 <samp><span class="option">--disable-bootstrap</span></samp>. The default is the argument to 884 <samp><span class="option">--with-host-libstdcxx</span></samp>, if specified. 885 886 <br><dt><code>--with-boot-ldflags=</code><var>flags</var><dd>This option may be used to set linker flags to be used when linking 887 stage 2 and later when bootstrapping GCC. By default no special flags 888 are used. 889 890 <br><dt><code>--with-boot-libs=</code><var>libs</var><dd>This option may be used to set libraries to be used when linking stage 2 891 and later when bootstrapping GCC. The default is the argument to 892 <samp><span class="option">--with-host-libstdcxx</span></samp>, if specified. 893 894 <br><dt><code>--with-debug-prefix-map=</code><var>map</var><dd>Convert source directory names using <samp><span class="option">-fdebug-prefix-map</span></samp> when 895 building runtime libraries. ‘<samp><var>map</var></samp>’ is a space-separated 896 list of maps of the form ‘<samp><var>old</var><span class="samp">=</span><var>new</var></samp>’. 897 898 <br><dt><code>--enable-linker-build-id</code><dd>Tells GCC to pass <samp><span class="option">--build-id</span></samp> option to the linker for all final 899 links (links performed without the <samp><span class="option">-r</span></samp> or <samp><span class="option">--relocatable</span></samp> 900 option), if the linker supports it. If you specify 901 <samp><span class="option">--enable-linker-build-id</span></samp>, but your linker does not 902 support <samp><span class="option">--build-id</span></samp> option, a warning is issued and the 903 <samp><span class="option">--enable-linker-build-id</span></samp> option is ignored. The default is off. 904 905 <br><dt><code>--enable-gnu-unique-object</code><dt><code>--disable-gnu-unique-object</code><dd>Tells GCC to use the gnu_unique_object relocation for C++ template 906 static data members and inline function local statics. Enabled by 907 default for a native toolchain with an assembler that accepts it and 908 GLIBC 2.11 or above, otherwise disabled. 909 910 <br><dt><code>--enable-lto</code><dd>Enable support for link-time optimization (LTO). This is enabled by 911 default if a working libelf implementation is found (see 912 <samp><span class="option">--with-libelf</span></samp>). 913 914 <br><dt><code>--with-libelf=</code><var>pathname</var><dt><code>--with-libelf-include=</code><var>pathname</var><dt><code>--with-libelf-lib=</code><var>pathname</var><dd>If you do not have libelf installed in a standard location and you 915 want to enable support for link-time optimization (LTO), you can 916 explicitly specify the directory where libelf is installed 917 (‘<samp><span class="samp">--with-libelf=</span><var>libelfinstalldir</var></samp>’). The 918 <samp><span class="option">--with-libelf=</span><var>libelfinstalldir</var></samp> option is shorthand for 919 <samp><span class="option">--with-libelf-include=</span><var>libelfinstalldir</var><span class="option">/include</span></samp> 920 <samp><span class="option">--with-libelf-lib=</span><var>libelfinstalldir</var><span class="option">/lib</span></samp>. 921 922 <br><dt><code>--enable-gold</code><dd>Enable support for using <samp><span class="command">gold</span></samp> as the linker. If gold support is 923 enabled together with <samp><span class="option">--enable-lto</span></samp>, an additional directory 924 <samp><span class="file">lto-plugin</span></samp> will be built. The code in this directory is a 925 plugin for gold that allows the link-time optimizer to extract object 926 files with LTO information out of library archives. See 927 <samp><span class="option">-flto</span></samp> and <samp><span class="option">-fwhopr</span></samp> for details. 928 </dl> 929 930 <h4 class="subheading"><a name="TOC3"></a>Cross-Compiler-Specific Options</h4> 931 932 <p>The following options only apply to building cross compilers. 933 934 <dl> 935 <dt><code>--with-sysroot</code><dt><code>--with-sysroot=</code><var>dir</var><dd>Tells GCC to consider <var>dir</var> as the root of a tree that contains a 936 (subset of) the root filesystem of the target operating system. 937 Target system headers, libraries and run-time object files will be 938 searched in there. More specifically, this acts as if 939 <samp><span class="option">--sysroot=</span><var>dir</var></samp> was added to the default options of the built 940 compiler. The specified directory is not copied into the 941 install tree, unlike the options <samp><span class="option">--with-headers</span></samp> and 942 <samp><span class="option">--with-libs</span></samp> that this option obsoletes. The default value, 943 in case <samp><span class="option">--with-sysroot</span></samp> is not given an argument, is 944 <samp><span class="option">${gcc_tooldir}/sys-root</span></samp>. If the specified directory is a 945 subdirectory of <samp><span class="option">${exec_prefix}</span></samp>, then it will be found relative to 946 the GCC binaries if the installation tree is moved. 947 948 <p>This option affects the system root for the compiler used to build 949 target libraries (which runs on the build system) and the compiler newly 950 installed with <code>make install</code>; it does not affect the compiler which is 951 used to build GCC itself. 952 953 <br><dt><code>--with-build-sysroot</code><dt><code>--with-build-sysroot=</code><var>dir</var><dd>Tells GCC to consider <var>dir</var> as the system root (see 954 <samp><span class="option">--with-sysroot</span></samp>) while building target libraries, instead of 955 the directory specified with <samp><span class="option">--with-sysroot</span></samp>. This option is 956 only useful when you are already using <samp><span class="option">--with-sysroot</span></samp>. You 957 can use <samp><span class="option">--with-build-sysroot</span></samp> when you are configuring with 958 <samp><span class="option">--prefix</span></samp> set to a directory that is different from the one in 959 which you are installing GCC and your target libraries. 960 961 <p>This option affects the system root for the compiler used to build 962 target libraries (which runs on the build system); it does not affect 963 the compiler which is used to build GCC itself. 964 965 <br><dt><code>--with-headers</code><dt><code>--with-headers=</code><var>dir</var><dd>Deprecated in favor of <samp><span class="option">--with-sysroot</span></samp>. 966 Specifies that target headers are available when building a cross compiler. 967 The <var>dir</var> argument specifies a directory which has the target include 968 files. These include files will be copied into the <samp><span class="file">gcc</span></samp> install 969 directory. <em>This option with the </em><var>dir</var><em> argument is required</em> when 970 building a cross compiler, if <samp><var>prefix</var><span class="file">/</span><var>target</var><span class="file">/sys-include</span></samp> 971 doesn't pre-exist. If <samp><var>prefix</var><span class="file">/</span><var>target</var><span class="file">/sys-include</span></samp> does 972 pre-exist, the <var>dir</var> argument may be omitted. <samp><span class="command">fixincludes</span></samp> 973 will be run on these files to make them compatible with GCC. 974 975 <br><dt><code>--without-headers</code><dd>Tells GCC not use any target headers from a libc when building a cross 976 compiler. When crossing to GNU/Linux, you need the headers so GCC 977 can build the exception handling for libgcc. 978 979 <br><dt><code>--with-libs</code><dt><code>--with-libs="</code><var>dir1</var> <var>dir2</var><code> ... </code><var>dirN</var><code>"</code><dd>Deprecated in favor of <samp><span class="option">--with-sysroot</span></samp>. 980 Specifies a list of directories which contain the target runtime 981 libraries. These libraries will be copied into the <samp><span class="file">gcc</span></samp> install 982 directory. If the directory list is omitted, this option has no 983 effect. 984 985 <br><dt><code>--with-newlib</code><dd>Specifies that ‘<samp><span class="samp">newlib</span></samp>’ is 986 being used as the target C library. This causes <code>__eprintf</code> to be 987 omitted from <samp><span class="file">libgcc.a</span></samp> on the assumption that it will be provided by 988 ‘<samp><span class="samp">newlib</span></samp>’. 989 990 <br><dt><code>--with-build-time-tools=</code><var>dir</var><dd>Specifies where to find the set of target tools (assembler, linker, etc.) 991 that will be used while building GCC itself. This option can be useful 992 if the directory layouts are different between the system you are building 993 GCC on, and the system where you will deploy it. 994 995 <p>For example, on an ‘<samp><span class="samp">ia64-hp-hpux</span></samp>’ system, you may have the GNU 996 assembler and linker in <samp><span class="file">/usr/bin</span></samp>, and the native tools in a 997 different path, and build a toolchain that expects to find the 998 native tools in <samp><span class="file">/usr/bin</span></samp>. 999 1000 <p>When you use this option, you should ensure that <var>dir</var> includes 1001 <samp><span class="command">ar</span></samp>, <samp><span class="command">as</span></samp>, <samp><span class="command">ld</span></samp>, <samp><span class="command">nm</span></samp>, 1002 <samp><span class="command">ranlib</span></samp> and <samp><span class="command">strip</span></samp> if necessary, and possibly 1003 <samp><span class="command">objdump</span></samp>. Otherwise, GCC may use an inconsistent set of 1004 tools. 1005 </dl> 1006 1007 <h4 class="subheading"><a name="TOC4"></a>Java-Specific Options</h4> 1008 1009 <p>The following option applies to the build of the Java front end. 1010 1011 <dl> 1012 <dt><code>--disable-libgcj</code><dd>Specify that the run-time libraries 1013 used by GCJ should not be built. This is useful in case you intend 1014 to use GCJ with some other run-time, or you're going to install it 1015 separately, or it just happens not to build on your particular 1016 machine. In general, if the Java front end is enabled, the GCJ 1017 libraries will be enabled too, unless they're known to not work on 1018 the target platform. If GCJ is enabled but ‘<samp><span class="samp">libgcj</span></samp>’ isn't built, you 1019 may need to port it; in this case, before modifying the top-level 1020 <samp><span class="file">configure.in</span></samp> so that ‘<samp><span class="samp">libgcj</span></samp>’ is enabled by default on this platform, 1021 you may use <samp><span class="option">--enable-libgcj</span></samp> to override the default. 1022 1023 </dl> 1024 1025 <p>The following options apply to building ‘<samp><span class="samp">libgcj</span></samp>’. 1026 1027 <h5 class="subsubheading"><a name="TOC5"></a>General Options</h5> 1028 1029 <dl> 1030 <dt><code>--enable-java-maintainer-mode</code><dd>By default the ‘<samp><span class="samp">libjava</span></samp>’ build will not attempt to compile the 1031 <samp><span class="file">.java</span></samp> source files to <samp><span class="file">.class</span></samp>. Instead, it will use the 1032 <samp><span class="file">.class</span></samp> files from the source tree. If you use this option you 1033 must have executables named <samp><span class="command">ecj1</span></samp> and <samp><span class="command">gjavah</span></samp> in your path 1034 for use by the build. You must use this option if you intend to 1035 modify any <samp><span class="file">.java</span></samp> files in <samp><span class="file">libjava</span></samp>. 1036 1037 <br><dt><code>--with-java-home=</code><var>dirname</var><dd>This ‘<samp><span class="samp">libjava</span></samp>’ option overrides the default value of the 1038 ‘<samp><span class="samp">java.home</span></samp>’ system property. It is also used to set 1039 ‘<samp><span class="samp">sun.boot.class.path</span></samp>’ to <samp><var>dirname</var><span class="file">/lib/rt.jar</span></samp>. By 1040 default ‘<samp><span class="samp">java.home</span></samp>’ is set to <samp><var>prefix</var></samp> and 1041 ‘<samp><span class="samp">sun.boot.class.path</span></samp>’ to 1042 <samp><var>datadir</var><span class="file">/java/libgcj-</span><var>version</var><span class="file">.jar</span></samp>. 1043 1044 <br><dt><code>--with-ecj-jar=</code><var>filename</var><dd>This option can be used to specify the location of an external jar 1045 file containing the Eclipse Java compiler. A specially modified 1046 version of this compiler is used by <samp><span class="command">gcj</span></samp> to parse 1047 <samp><span class="file">.java</span></samp> source files. If this option is given, the 1048 ‘<samp><span class="samp">libjava</span></samp>’ build will create and install an <samp><span class="file">ecj1</span></samp> executable 1049 which uses this jar file at runtime. 1050 1051 <p>If this option is not given, but an <samp><span class="file">ecj.jar</span></samp> file is found in 1052 the topmost source tree at configure time, then the ‘<samp><span class="samp">libgcj</span></samp>’ 1053 build will create and install <samp><span class="file">ecj1</span></samp>, and will also install the 1054 discovered <samp><span class="file">ecj.jar</span></samp> into a suitable place in the install tree. 1055 1056 <p>If <samp><span class="file">ecj1</span></samp> is not installed, then the user will have to supply one 1057 on his path in order for <samp><span class="command">gcj</span></samp> to properly parse <samp><span class="file">.java</span></samp> 1058 source files. A suitable jar is available from 1059 <a href="ftp://sourceware.org/pub/java/">ftp://sourceware.org/pub/java/</a>. 1060 1061 <br><dt><code>--disable-getenv-properties</code><dd>Don't set system properties from <samp><span class="env">GCJ_PROPERTIES</span></samp>. 1062 1063 <br><dt><code>--enable-hash-synchronization</code><dd>Use a global hash table for monitor locks. Ordinarily, 1064 ‘<samp><span class="samp">libgcj</span></samp>’'s ‘<samp><span class="samp">configure</span></samp>’ script automatically makes 1065 the correct choice for this option for your platform. Only use 1066 this if you know you need the library to be configured differently. 1067 1068 <br><dt><code>--enable-interpreter</code><dd>Enable the Java interpreter. The interpreter is automatically 1069 enabled by default on all platforms that support it. This option 1070 is really only useful if you want to disable the interpreter 1071 (using <samp><span class="option">--disable-interpreter</span></samp>). 1072 1073 <br><dt><code>--disable-java-net</code><dd>Disable java.net. This disables the native part of java.net only, 1074 using non-functional stubs for native method implementations. 1075 1076 <br><dt><code>--disable-jvmpi</code><dd>Disable JVMPI support. 1077 1078 <br><dt><code>--disable-libgcj-bc</code><dd>Disable BC ABI compilation of certain parts of libgcj. By default, 1079 some portions of libgcj are compiled with <samp><span class="option">-findirect-dispatch</span></samp> 1080 and <samp><span class="option">-fno-indirect-classes</span></samp>, allowing them to be overridden at 1081 run-time. 1082 1083 <p>If <samp><span class="option">--disable-libgcj-bc</span></samp> is specified, libgcj is built without 1084 these options. This allows the compile-time linker to resolve 1085 dependencies when statically linking to libgcj. However it makes it 1086 impossible to override the affected portions of libgcj at run-time. 1087 1088 <br><dt><code>--enable-reduced-reflection</code><dd>Build most of libgcj with <samp><span class="option">-freduced-reflection</span></samp>. This reduces 1089 the size of libgcj at the expense of not being able to do accurate 1090 reflection on the classes it contains. This option is safe if you 1091 know that code using libgcj will never use reflection on the standard 1092 runtime classes in libgcj (including using serialization, RMI or CORBA). 1093 1094 <br><dt><code>--with-ecos</code><dd>Enable runtime eCos target support. 1095 1096 <br><dt><code>--without-libffi</code><dd>Don't use ‘<samp><span class="samp">libffi</span></samp>’. This will disable the interpreter and JNI 1097 support as well, as these require ‘<samp><span class="samp">libffi</span></samp>’ to work. 1098 1099 <br><dt><code>--enable-libgcj-debug</code><dd>Enable runtime debugging code. 1100 1101 <br><dt><code>--enable-libgcj-multifile</code><dd>If specified, causes all <samp><span class="file">.java</span></samp> source files to be 1102 compiled into <samp><span class="file">.class</span></samp> files in one invocation of 1103 ‘<samp><span class="samp">gcj</span></samp>’. This can speed up build time, but is more 1104 resource-intensive. If this option is unspecified or 1105 disabled, ‘<samp><span class="samp">gcj</span></samp>’ is invoked once for each <samp><span class="file">.java</span></samp> 1106 file to compile into a <samp><span class="file">.class</span></samp> file. 1107 1108 <br><dt><code>--with-libiconv-prefix=DIR</code><dd>Search for libiconv in <samp><span class="file">DIR/include</span></samp> and <samp><span class="file">DIR/lib</span></samp>. 1109 1110 <br><dt><code>--enable-sjlj-exceptions</code><dd>Force use of the <code>setjmp</code>/<code>longjmp</code>-based scheme for exceptions. 1111 ‘<samp><span class="samp">configure</span></samp>’ ordinarily picks the correct value based on the platform. 1112 Only use this option if you are sure you need a different setting. 1113 1114 <br><dt><code>--with-system-zlib</code><dd>Use installed ‘<samp><span class="samp">zlib</span></samp>’ rather than that included with GCC. 1115 1116 <br><dt><code>--with-win32-nlsapi=ansi, unicows or unicode</code><dd>Indicates how MinGW ‘<samp><span class="samp">libgcj</span></samp>’ translates between UNICODE 1117 characters and the Win32 API. 1118 1119 <br><dt><code>--enable-java-home</code><dd>If enabled, this creates a JPackage compatible SDK environment during install. 1120 Note that if –enable-java-home is used, –with-arch-directory=ARCH must also 1121 be specified. 1122 1123 <br><dt><code>--with-arch-directory=ARCH</code><dd>Specifies the name to use for the <samp><span class="file">jre/lib/ARCH</span></samp> directory in the SDK 1124 environment created when –enable-java-home is passed. Typical names for this 1125 directory include i386, amd64, ia64, etc. 1126 1127 <br><dt><code>--with-os-directory=DIR</code><dd>Specifies the OS directory for the SDK include directory. This is set to auto 1128 detect, and is typically 'linux'. 1129 1130 <br><dt><code>--with-origin-name=NAME</code><dd>Specifies the JPackage origin name. This defaults to the 'gcj' in 1131 java-1.5.0-gcj. 1132 1133 <br><dt><code>--with-arch-suffix=SUFFIX</code><dd>Specifies the suffix for the sdk directory. Defaults to the empty string. 1134 Examples include '.x86_64' in 'java-1.5.0-gcj-1.5.0.0.x86_64'. 1135 1136 <br><dt><code>--with-jvm-root-dir=DIR</code><dd>Specifies where to install the SDK. Default is $(prefix)/lib/jvm. 1137 1138 <br><dt><code>--with-jvm-jar-dir=DIR</code><dd>Specifies where to install jars. Default is $(prefix)/lib/jvm-exports. 1139 1140 <br><dt><code>--with-python-dir=DIR</code><dd>Specifies where to install the Python modules used for aot-compile. DIR should 1141 not include the prefix used in installation. For example, if the Python modules 1142 are to be installed in /usr/lib/python2.5/site-packages, then 1143 –with-python-dir=/lib/python2.5/site-packages should be passed. If this is 1144 not specified, then the Python modules are installed in $(prefix)/share/python. 1145 1146 <br><dt><code>--enable-aot-compile-rpm</code><dd>Adds aot-compile-rpm to the list of installed scripts. 1147 1148 <br><dt><code>--enable-browser-plugin</code><dd>Build the gcjwebplugin web browser plugin. 1149 1150 <dl> 1151 <dt><code>ansi</code><dd>Use the single-byte <code>char</code> and the Win32 A functions natively, 1152 translating to and from UNICODE when using these functions. If 1153 unspecified, this is the default. 1154 1155 <br><dt><code>unicows</code><dd>Use the <code>WCHAR</code> and Win32 W functions natively. Adds 1156 <code>-lunicows</code> to <samp><span class="file">libgcj.spec</span></samp> to link with ‘<samp><span class="samp">libunicows</span></samp>’. 1157 <samp><span class="file">unicows.dll</span></samp> needs to be deployed on Microsoft Windows 9X machines 1158 running built executables. <samp><span class="file">libunicows.a</span></samp>, an open-source 1159 import library around Microsoft's <code>unicows.dll</code>, is obtained from 1160 <a href="http://libunicows.sourceforge.net/">http://libunicows.sourceforge.net/</a>, which also gives details 1161 on getting <samp><span class="file">unicows.dll</span></samp> from Microsoft. 1162 1163 <br><dt><code>unicode</code><dd>Use the <code>WCHAR</code> and Win32 W functions natively. Does <em>not</em> 1164 add <code>-lunicows</code> to <samp><span class="file">libgcj.spec</span></samp>. The built executables will 1165 only run on Microsoft Windows NT and above. 1166 </dl> 1167 </dl> 1168 1169 <h5 class="subsubheading"><a name="TOC6"></a>AWT-Specific Options</h5> 1170 1171 <dl> 1172 <dt><code>--with-x</code><dd>Use the X Window System. 1173 1174 <br><dt><code>--enable-java-awt=PEER(S)</code><dd>Specifies the AWT peer library or libraries to build alongside 1175 ‘<samp><span class="samp">libgcj</span></samp>’. If this option is unspecified or disabled, AWT 1176 will be non-functional. Current valid values are <samp><span class="option">gtk</span></samp> and 1177 <samp><span class="option">xlib</span></samp>. Multiple libraries should be separated by a 1178 comma (i.e. <samp><span class="option">--enable-java-awt=gtk,xlib</span></samp>). 1179 1180 <br><dt><code>--enable-gtk-cairo</code><dd>Build the cairo Graphics2D implementation on GTK. 1181 1182 <br><dt><code>--enable-java-gc=TYPE</code><dd>Choose garbage collector. Defaults to <samp><span class="option">boehm</span></samp> if unspecified. 1183 1184 <br><dt><code>--disable-gtktest</code><dd>Do not try to compile and run a test GTK+ program. 1185 1186 <br><dt><code>--disable-glibtest</code><dd>Do not try to compile and run a test GLIB program. 1187 1188 <br><dt><code>--with-libart-prefix=PFX</code><dd>Prefix where libart is installed (optional). 1189 1190 <br><dt><code>--with-libart-exec-prefix=PFX</code><dd>Exec prefix where libart is installed (optional). 1191 1192 <br><dt><code>--disable-libarttest</code><dd>Do not try to compile and run a test libart program. 1193 1194 </dl> 1195 1196 <p><hr /> 1197 <p><a href="./index.html">Return to the GCC Installation page</a> 1198 1199 <!-- ***Building**************************************************************** --> 1200 <!-- ***Testing***************************************************************** --> 1201 <!-- ***Final install*********************************************************** --> 1202 <!-- ***Binaries**************************************************************** --> 1203 <!-- ***Specific**************************************************************** --> 1204 <!-- ***Old documentation****************************************************** --> 1205 <!-- ***GFDL******************************************************************** --> 1206 <!-- *************************************************************************** --> 1207 <!-- Part 6 The End of the Document --> 1208 </body></html> 1209 1210
Indexes created Thu Jul 16 00:26:27 UTC 2026