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diff --git a/INSTALL/configure.html b/INSTALL/configure.html new file mode 100644 index 000000000..6bb61c688 --- /dev/null +++ b/INSTALL/configure.html @@ -0,0 +1,1249 @@ +<html lang="en"> +<head> +<title>Installing GCC: Configuration</title> +<meta http-equiv="Content-Type" content="text/html"> +<meta name="description" content="Installing GCC: Configuration"> +<meta name="generator" content="makeinfo 4.13"> +<link title="Top" rel="top" href="#Top"> +<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> +<!-- +Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, +1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, +2010 Free Software Foundation, Inc. + + Permission is granted to copy, distribute and/or modify this document +under the terms of the GNU Free Documentation License, Version 1.3 or +any later version published by the Free Software Foundation; with no +Invariant Sections, the Front-Cover texts being (a) (see below), and +with the Back-Cover Texts being (b) (see below). A copy of the +license is included in the section entitled "GNU Free Documentation License". + +(a) The FSF's Front-Cover Text is: + + A GNU Manual + +(b) The FSF's Back-Cover Text is: + + You have freedom to copy and modify this GNU Manual, like GNU + software. Copies published by the Free Software Foundation raise + funds for GNU development.--> +<meta http-equiv="Content-Style-Type" content="text/css"> +<style type="text/css"><!-- + pre.display { font-family:inherit } + pre.format { font-family:inherit } + pre.smalldisplay { font-family:inherit; font-size:smaller } + pre.smallformat { font-family:inherit; font-size:smaller } + pre.smallexample { font-size:smaller } + pre.smalllisp { font-size:smaller } + span.sc { font-variant:small-caps } + span.roman { font-family:serif; font-weight:normal; } + span.sansserif { font-family:sans-serif; font-weight:normal; } +--></style> +</head> +<body> +<h1 class="settitle">Installing GCC: Configuration</h1> +<a name="index-Configuration-1"></a><a name="index-Installing-GCC_003a-Configuration-2"></a> +Like most GNU software, GCC must be configured before it can be built. +This document describes the recommended configuration procedure +for both native and cross targets. + + <p>We use <var>srcdir</var> to refer to the toplevel source directory for +GCC; we use <var>objdir</var> to refer to the toplevel build/object directory. + + <p>If you obtained the sources via SVN, <var>srcdir</var> must refer to the top +<samp><span class="file">gcc</span></samp> directory, the one where the <samp><span class="file">MAINTAINERS</span></samp> file can be +found, and not its <samp><span class="file">gcc</span></samp> subdirectory, otherwise the build will fail. + + <p>If either <var>srcdir</var> or <var>objdir</var> is located on an automounted NFS +file system, the shell's built-in <samp><span class="command">pwd</span></samp> command will return +temporary pathnames. Using these can lead to various sorts of build +problems. To avoid this issue, set the <samp><span class="env">PWDCMD</span></samp> environment +variable to an automounter-aware <samp><span class="command">pwd</span></samp> command, e.g., +<samp><span class="command">pawd</span></samp> or ‘<samp><span class="samp">amq -w</span></samp>’, during the configuration and build +phases. + + <p>First, we <strong>highly</strong> recommend that GCC be built into a +separate directory from the sources which does <strong>not</strong> reside +within the source tree. This is how we generally build GCC; building +where <var>srcdir</var> == <var>objdir</var> should still work, but doesn't +get extensive testing; building where <var>objdir</var> is a subdirectory +of <var>srcdir</var> is unsupported. + + <p>If you have previously built GCC in the same directory for a +different target machine, do ‘<samp><span class="samp">make distclean</span></samp>’ to delete all files +that might be invalid. One of the files this deletes is <samp><span class="file">Makefile</span></samp>; +if ‘<samp><span class="samp">make distclean</span></samp>’ complains that <samp><span class="file">Makefile</span></samp> does not exist +or issues a message like “don't know how to make distclean” it probably +means that the directory is already suitably clean. However, with the +recommended method of building in a separate <var>objdir</var>, you should +simply use a different <var>objdir</var> for each target. + + <p>Second, when configuring a native system, either <samp><span class="command">cc</span></samp> or +<samp><span class="command">gcc</span></samp> must be in your path or you must set <samp><span class="env">CC</span></samp> in +your environment before running configure. Otherwise the configuration +scripts may fail. + + <p>To configure GCC: + +<pre class="smallexample"> % mkdir <var>objdir</var> + % cd <var>objdir</var> + % <var>srcdir</var>/configure [<var>options</var>] [<var>target</var>] +</pre> + <h3 class="heading"><a name="TOC0"></a>Distributor options</h3> + +<p>If you will be distributing binary versions of GCC, with modifications +to the source code, you should use the options described in this +section to make clear that your version contains modifications. + + <dl> +<dt><code>--with-pkgversion=</code><var>version</var><dd>Specify a string that identifies your package. You may wish +to include a build number or build date. This version string will be +included in the output of <samp><span class="command">gcc --version</span></samp>. This suffix does +not replace the default version string, only the ‘<samp><span class="samp">GCC</span></samp>’ part. + + <p>The default value is ‘<samp><span class="samp">GCC</span></samp>’. + + <br><dt><code>--with-bugurl=</code><var>url</var><dd>Specify the URL that users should visit if they wish to report a bug. +You are of course welcome to forward bugs reported to you to the FSF, +if you determine that they are not bugs in your modifications. + + <p>The default value refers to the FSF's GCC bug tracker. + + </dl> + +<h3 class="heading"><a name="TOC1"></a>Target specification</h3> + + <ul> +<li>GCC has code to correctly determine the correct value for <var>target</var> +for nearly all native systems. Therefore, we highly recommend you do +not provide a configure target when configuring a native compiler. + + <li><var>target</var> must be specified as <samp><span class="option">--target=</span><var>target</var></samp> +when configuring a cross compiler; examples of valid targets would be +m68k-elf, sh-elf, etc. + + <li>Specifying just <var>target</var> instead of <samp><span class="option">--target=</span><var>target</var></samp> +implies that the host defaults to <var>target</var>. +</ul> + +<h3 class="heading"><a name="TOC2"></a>Options specification</h3> + +<p>Use <var>options</var> to override several configure time options for +GCC. A list of supported <var>options</var> follows; ‘<samp><span class="samp">configure +--help</span></samp>’ may list other options, but those not listed below may not +work and should not normally be used. + + <p>Note that each <samp><span class="option">--enable</span></samp> option has a corresponding +<samp><span class="option">--disable</span></samp> option and that each <samp><span class="option">--with</span></samp> option has a +corresponding <samp><span class="option">--without</span></samp> option. + + <dl> +<dt><code>--prefix=</code><var>dirname</var><dd>Specify the toplevel installation +directory. This is the recommended way to install the tools into a directory +other than the default. The toplevel installation directory defaults to +<samp><span class="file">/usr/local</span></samp>. + + <p>We <strong>highly</strong> recommend against <var>dirname</var> being the same or a +subdirectory of <var>objdir</var> or vice versa. If specifying a directory +beneath a user's home directory tree, some shells will not expand +<var>dirname</var> correctly if it contains the ‘<samp><span class="samp">~</span></samp>’ metacharacter; use +<samp><span class="env">$HOME</span></samp> instead. + + <p>The following standard <samp><span class="command">autoconf</span></samp> options are supported. Normally you +should not need to use these options. + <dl> +<dt><code>--exec-prefix=</code><var>dirname</var><dd>Specify the toplevel installation directory for architecture-dependent +files. The default is <samp><var>prefix</var></samp>. + + <br><dt><code>--bindir=</code><var>dirname</var><dd>Specify the installation directory for the executables called by users +(such as <samp><span class="command">gcc</span></samp> and <samp><span class="command">g++</span></samp>). The default is +<samp><var>exec-prefix</var><span class="file">/bin</span></samp>. + + <br><dt><code>--libdir=</code><var>dirname</var><dd>Specify the installation directory for object code libraries and +internal data files of GCC. The default is <samp><var>exec-prefix</var><span class="file">/lib</span></samp>. + + <br><dt><code>--libexecdir=</code><var>dirname</var><dd>Specify the installation directory for internal executables of GCC. +The default is <samp><var>exec-prefix</var><span class="file">/libexec</span></samp>. + + <br><dt><code>--with-slibdir=</code><var>dirname</var><dd>Specify the installation directory for the shared libgcc library. The +default is <samp><var>libdir</var></samp>. + + <br><dt><code>--datarootdir=</code><var>dirname</var><dd>Specify the root of the directory tree for read-only architecture-independent +data files referenced by GCC. The default is <samp><var>prefix</var><span class="file">/share</span></samp>. + + <br><dt><code>--infodir=</code><var>dirname</var><dd>Specify the installation directory for documentation in info format. +The default is <samp><var>datarootdir</var><span class="file">/info</span></samp>. + + <br><dt><code>--datadir=</code><var>dirname</var><dd>Specify the installation directory for some architecture-independent +data files referenced by GCC. The default is <samp><var>datarootdir</var></samp>. + + <br><dt><code>--docdir=</code><var>dirname</var><dd>Specify the installation directory for documentation files (other +than Info) for GCC. The default is <samp><var>datarootdir</var><span class="file">/doc</span></samp>. + + <br><dt><code>--htmldir=</code><var>dirname</var><dd>Specify the installation directory for HTML documentation files. +The default is <samp><var>docdir</var></samp>. + + <br><dt><code>--pdfdir=</code><var>dirname</var><dd>Specify the installation directory for PDF documentation files. +The default is <samp><var>docdir</var></samp>. + + <br><dt><code>--mandir=</code><var>dirname</var><dd>Specify the installation directory for manual pages. The default is +<samp><var>datarootdir</var><span class="file">/man</span></samp>. (Note that the manual pages are only extracts +from the full GCC manuals, which are provided in Texinfo format. The manpages +are derived by an automatic conversion process from parts of the full +manual.) + + <br><dt><code>--with-gxx-include-dir=</code><var>dirname</var><dd>Specify +the installation directory for G++ header files. The default depends +on other configuration options, and differs between cross and native +configurations. + + </dl> + + <br><dt><code>--program-prefix=</code><var>prefix</var><dd>GCC supports some transformations of the names of its programs when +installing them. This option prepends <var>prefix</var> to the names of +programs to install in <var>bindir</var> (see above). For example, specifying +<samp><span class="option">--program-prefix=foo-</span></samp> would result in ‘<samp><span class="samp">gcc</span></samp>’ +being installed as <samp><span class="file">/usr/local/bin/foo-gcc</span></samp>. + + <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> +(see above). For example, specifying <samp><span class="option">--program-suffix=-3.1</span></samp> +would result in ‘<samp><span class="samp">gcc</span></samp>’ being installed as +<samp><span class="file">/usr/local/bin/gcc-3.1</span></samp>. + + <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 +of programs to install in <var>bindir</var> (see above). <var>pattern</var> has to +consist of one or more basic ‘<samp><span class="samp">sed</span></samp>’ editing commands, separated by +semicolons. For example, if you want the ‘<samp><span class="samp">gcc</span></samp>’ program name to be +transformed to the installed program <samp><span class="file">/usr/local/bin/myowngcc</span></samp> and +the ‘<samp><span class="samp">g++</span></samp>’ program name to be transformed to +<samp><span class="file">/usr/local/bin/gspecial++</span></samp> without changing other program names, +you could use the pattern +<samp><span class="option">--program-transform-name='s/^gcc$/myowngcc/; s/^g++$/gspecial++/'</span></samp> +to achieve this effect. + + <p>All three options can be combined and used together, resulting in more +complex conversion patterns. As a basic rule, <var>prefix</var> (and +<var>suffix</var>) are prepended (appended) before further transformations +can happen with a special transformation script <var>pattern</var>. + + <p>As currently implemented, this option only takes effect for native +builds; cross compiler binaries' names are not transformed even when a +transformation is explicitly asked for by one of these options. + + <p>For native builds, some of the installed programs are also installed +with the target alias in front of their name, as in +‘<samp><span class="samp">i686-pc-linux-gnu-gcc</span></samp>’. All of the above transformations happen +before the target alias is prepended to the name—so, specifying +<samp><span class="option">--program-prefix=foo-</span></samp> and <samp><span class="option">program-suffix=-3.1</span></samp>, the +resulting binary would be installed as +<samp><span class="file">/usr/local/bin/i686-pc-linux-gnu-foo-gcc-3.1</span></samp>. + + <p>As a last shortcoming, none of the installed Ada programs are +transformed yet, which will be fixed in some time. + + <br><dt><code>--with-local-prefix=</code><var>dirname</var><dd>Specify the +installation directory for local include files. The default is +<samp><span class="file">/usr/local</span></samp>. Specify this option if you want the compiler to +search directory <samp><var>dirname</var><span class="file">/include</span></samp> for locally installed +header files <em>instead</em> of <samp><span class="file">/usr/local/include</span></samp>. + + <p>You should specify <samp><span class="option">--with-local-prefix</span></samp> <strong>only</strong> if your +site has a different convention (not <samp><span class="file">/usr/local</span></samp>) for where to put +site-specific files. + + <p>The default value for <samp><span class="option">--with-local-prefix</span></samp> is <samp><span class="file">/usr/local</span></samp> +regardless of the value of <samp><span class="option">--prefix</span></samp>. Specifying +<samp><span class="option">--prefix</span></samp> has no effect on which directory GCC searches for +local header files. This may seem counterintuitive, but actually it is +logical. + + <p>The purpose of <samp><span class="option">--prefix</span></samp> is to specify where to <em>install +GCC</em>. The local header files in <samp><span class="file">/usr/local/include</span></samp>—if you put +any in that directory—are not part of GCC. They are part of other +programs—perhaps many others. (GCC installs its own header files in +another directory which is based on the <samp><span class="option">--prefix</span></samp> value.) + + <p>Both the local-prefix include directory and the GCC-prefix include +directory are part of GCC's “system include” directories. Although these +two directories are not fixed, they need to be searched in the proper +order for the correct processing of the include_next directive. The +local-prefix include directory is searched before the GCC-prefix +include directory. Another characteristic of system include directories +is that pedantic warnings are turned off for headers in these directories. + + <p>Some autoconf macros add <samp><span class="option">-I </span><var>directory</var></samp> options to the +compiler command line, to ensure that directories containing installed +packages' headers are searched. When <var>directory</var> is one of GCC's +system include directories, GCC will ignore the option so that system +directories continue to be processed in the correct order. This +may result in a search order different from what was specified but the +directory will still be searched. + + <p>GCC automatically searches for ordinary libraries using +<samp><span class="env">GCC_EXEC_PREFIX</span></samp>. Thus, when the same installation prefix is +used for both GCC and packages, GCC will automatically search for +both headers and libraries. This provides a configuration that is +easy to use. GCC behaves in a manner similar to that when it is +installed as a system compiler in <samp><span class="file">/usr</span></samp>. + + <p>Sites that need to install multiple versions of GCC may not want to +use the above simple configuration. It is possible to use the +<samp><span class="option">--program-prefix</span></samp>, <samp><span class="option">--program-suffix</span></samp> and +<samp><span class="option">--program-transform-name</span></samp> options to install multiple versions +into a single directory, but it may be simpler to use different prefixes +and the <samp><span class="option">--with-local-prefix</span></samp> option to specify the location of the +site-specific files for each version. It will then be necessary for +users to specify explicitly the location of local site libraries +(e.g., with <samp><span class="env">LIBRARY_PATH</span></samp>). + + <p>The same value can be used for both <samp><span class="option">--with-local-prefix</span></samp> and +<samp><span class="option">--prefix</span></samp> provided it is not <samp><span class="file">/usr</span></samp>. This can be used +to avoid the default search of <samp><span class="file">/usr/local/include</span></samp>. + + <p><strong>Do not</strong> specify <samp><span class="file">/usr</span></samp> as the <samp><span class="option">--with-local-prefix</span></samp>! +The directory you use for <samp><span class="option">--with-local-prefix</span></samp> <strong>must not</strong> +contain any of the system's standard header files. If it did contain +them, certain programs would be miscompiled (including GNU Emacs, on +certain targets), because this would override and nullify the header +file corrections made by the <samp><span class="command">fixincludes</span></samp> script. + + <p>Indications are that people who use this option use it based on mistaken +ideas of what it is for. People use it as if it specified where to +install part of GCC. Perhaps they make this assumption because +installing GCC creates the directory. + + <br><dt><code>--enable-shared[=</code><var>package</var><code>[,...]]</code><dd>Build shared versions of libraries, if shared libraries are supported on +the target platform. Unlike GCC 2.95.x and earlier, shared libraries +are enabled by default on all platforms that support shared libraries. + + <p>If a list of packages is given as an argument, build shared libraries +only for the listed packages. For other packages, only static libraries +will be built. Package names currently recognized in the GCC tree are +‘<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 +‘<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>’, +‘<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>’. +Note ‘<samp><span class="samp">libiberty</span></samp>’ does not support shared libraries at all. + + <p>Use <samp><span class="option">--disable-shared</span></samp> to build only static libraries. Note that +<samp><span class="option">--disable-shared</span></samp> does not accept a list of package names as +argument, only <samp><span class="option">--enable-shared</span></samp> does. + + <br><dt><code><a name="with_002dgnu_002das"></a>--with-gnu-as</code><dd>Specify that the compiler should assume that the +assembler it finds is the GNU assembler. However, this does not modify +the rules to find an assembler and will result in confusion if the +assembler found is not actually the GNU assembler. (Confusion may also +result if the compiler finds the GNU assembler but has not been +configured with <samp><span class="option">--with-gnu-as</span></samp>.) If you have more than one +assembler installed on your system, you may want to use this option in +connection with <samp><span class="option">--with-as=</span><var>pathname</var></samp> or +<samp><span class="option">--with-build-time-tools=</span><var>pathname</var></samp>. + + <p>The following systems are the only ones where it makes a difference +whether you use the GNU assembler. On any other system, +<samp><span class="option">--with-gnu-as</span></samp> has no effect. + + <ul> +<li>‘<samp><span class="samp">hppa1.0-</span><var>any</var><span class="samp">-</span><var>any</var></samp>’ +<li>‘<samp><span class="samp">hppa1.1-</span><var>any</var><span class="samp">-</span><var>any</var></samp>’ +<li>‘<samp><span class="samp">sparc-sun-solaris2.</span><var>any</var></samp>’ +<li>‘<samp><span class="samp">sparc64-</span><var>any</var><span class="samp">-solaris2.</span><var>any</var></samp>’ +</ul> + + <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 +<var>pathname</var>, rather than the one found by the standard rules to find +an assembler, which are: + <ul> +<li>Unless GCC is being built with a cross compiler, check the +<samp><var>libexec</var><span class="file">/gcc/</span><var>target</var><span class="file">/</span><var>version</var></samp> directory. +<var>libexec</var> defaults to <samp><var>exec-prefix</var><span class="file">/libexec</span></samp>; +<var>exec-prefix</var> defaults to <var>prefix</var>, which +defaults to <samp><span class="file">/usr/local</span></samp> unless overridden by the +<samp><span class="option">--prefix=</span><var>pathname</var></samp> switch described above. <var>target</var> +is the target system triple, such as ‘<samp><span class="samp">sparc-sun-solaris2.7</span></samp>’, and +<var>version</var> denotes the GCC version, such as 3.0. + + <li>If the target system is the same that you are building on, check +operating system specific directories (e.g. <samp><span class="file">/usr/ccs/bin</span></samp> on +Sun Solaris 2). + + <li>Check in the <samp><span class="env">PATH</span></samp> for a tool whose name is prefixed by the +target system triple. + + <li>Check in the <samp><span class="env">PATH</span></samp> for a tool whose name is not prefixed by the +target system triple, if the host and target system triple are +the same (in other words, we use a host tool if it can be used for +the target as well). +</ul> + + <p>You may want to use <samp><span class="option">--with-as</span></samp> if no assembler +is installed in the directories listed above, or if you have multiple +assemblers installed and want to choose one that is not found by the +above rules. + + <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> +but for the linker. + + <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> +but for the linker. + + <br><dt><code>--with-stabs</code><dd>Specify that stabs debugging +information should be used instead of whatever format the host normally +uses. Normally GCC uses the same debug format as the host system. + + <p>On MIPS based systems and on Alphas, you must specify whether you want +GCC to create the normal ECOFF debugging format, or to use BSD-style +stabs passed through the ECOFF symbol table. The normal ECOFF debug +format cannot fully handle languages other than C. BSD stabs format can +handle other languages, but it only works with the GNU debugger GDB. + + <p>Normally, GCC uses the ECOFF debugging format by default; if you +prefer BSD stabs, specify <samp><span class="option">--with-stabs</span></samp> when you configure GCC. + + <p>No matter which default you choose when you configure GCC, the user +can use the <samp><span class="option">-gcoff</span></samp> and <samp><span class="option">-gstabs+</span></samp> options to specify explicitly +the debug format for a particular compilation. + + <p><samp><span class="option">--with-stabs</span></samp> is meaningful on the ISC system on the 386, also, if +<samp><span class="option">--with-gas</span></samp> is used. It selects use of stabs debugging +information embedded in COFF output. This kind of debugging information +supports C++ well; ordinary COFF debugging information does not. + + <p><samp><span class="option">--with-stabs</span></samp> is also meaningful on 386 systems running SVR4. It +selects use of stabs debugging information embedded in ELF output. The +C++ compiler currently (2.6.0) does not support the DWARF debugging +information normally used on 386 SVR4 platforms; stabs provide a +workable alternative. This requires gas and gdb, as the normal SVR4 +tools can not generate or interpret stabs. + + <br><dt><code>--enable-multiarch</code><dd>Specify whether to enable or disable multiarch support. The default is +to check for glibc start files in a multiarch location, and enable it +if the files are found. The auto detection is enabled for native builds, +and for cross builds configured with <samp><span class="option">--with-sysroot</span></samp>. +More documentation about multiarch can be found at +<a href="http://wiki.debian.org/Multiarch">http://wiki.debian.org/Multiarch</a>. + + <br><dt><code>--disable-multilib</code><dd>Specify that multiple target +libraries to support different target variants, calling +conventions, etc. should not be built. The default is to build a +predefined set of them. + + <p>Some targets provide finer-grained control over which multilibs are built +(e.g., <samp><span class="option">--disable-softfloat</span></samp>): + <dl> +<dt><code>arc-*-elf*</code><dd>biendian. + + <br><dt><code>arm-*-*</code><dd>fpu, 26bit, underscore, interwork, biendian, nofmult. + + <br><dt><code>m68*-*-*</code><dd>softfloat, m68881, m68000, m68020. + + <br><dt><code>mips*-*-*</code><dd>single-float, biendian, softfloat. + + <br><dt><code>powerpc*-*-*, rs6000*-*-*</code><dd>aix64, pthread, softfloat, powercpu, powerpccpu, powerpcos, biendian, +sysv, aix. + + </dl> + + <br><dt><code>--with-multilib-list=</code><var>list</var><dt><code>--without-multilib-list</code><dd>Specify what multilibs to build. +Currently only implemented for sh*-*-*. + + <p><var>list</var> is a comma separated list of CPU names. These must be of the +form <code>sh*</code> or <code>m*</code> (in which case they match the compiler option +for that processor). The list should not contain any endian options - +these are handled by <samp><span class="option">--with-endian</span></samp>. + + <p>If <var>list</var> is empty, then there will be no multilibs for extra +processors. The multilib for the secondary endian remains enabled. + + <p>As a special case, if an entry in the list starts with a <code>!</code> +(exclamation point), then it is added to the list of excluded multilibs. +Entries of this sort should be compatible with ‘<samp><span class="samp">MULTILIB_EXCLUDES</span></samp>’ +(once the leading <code>!</code> has been stripped). + + <p>If <samp><span class="option">--with-multilib-list</span></samp> is not given, then a default set of +multilibs is selected based on the value of <samp><span class="option">--target</span></samp>. This is +usually the complete set of libraries, but some targets imply a more +specialized subset. + + <p>Example 1: to configure a compiler for SH4A only, but supporting both +endians, with little endian being the default: + <pre class="smallexample"> --with-cpu=sh4a --with-endian=little,big --with-multilib-list= +</pre> + <p>Example 2: to configure a compiler for both SH4A and SH4AL-DSP, but with +only little endian SH4AL: + <pre class="smallexample"> --with-cpu=sh4a --with-endian=little,big \ + --with-multilib-list=sh4al,!mb/m4al +</pre> + <br><dt><code>--with-endian=</code><var>endians</var><dd>Specify what endians to use. +Currently only implemented for sh*-*-*. + + <p><var>endians</var> may be one of the following: + <dl> +<dt><code>big</code><dd>Use big endian exclusively. +<br><dt><code>little</code><dd>Use little endian exclusively. +<br><dt><code>big,little</code><dd>Use big endian by default. Provide a multilib for little endian. +<br><dt><code>little,big</code><dd>Use little endian by default. Provide a multilib for big endian. +</dl> + + <br><dt><code>--enable-threads</code><dd>Specify that the target +supports threads. This affects the Objective-C compiler and runtime +library, and exception handling for other languages like C++ and Java. +On some systems, this is the default. + + <p>In general, the best (and, in many cases, the only known) threading +model available will be configured for use. Beware that on some +systems, GCC has not been taught what threading models are generally +available for the system. In this case, <samp><span class="option">--enable-threads</span></samp> is an +alias for <samp><span class="option">--enable-threads=single</span></samp>. + + <br><dt><code>--disable-threads</code><dd>Specify that threading support should be disabled for the system. +This is an alias for <samp><span class="option">--enable-threads=single</span></samp>. + + <br><dt><code>--enable-threads=</code><var>lib</var><dd>Specify that +<var>lib</var> is the thread support library. This affects the Objective-C +compiler and runtime library, and exception handling for other languages +like C++ and Java. The possibilities for <var>lib</var> are: + + <dl> +<dt><code>aix</code><dd>AIX thread support. +<br><dt><code>dce</code><dd>DCE thread support. +<br><dt><code>gnat</code><dd>Ada tasking support. For non-Ada programs, this setting is equivalent +to ‘<samp><span class="samp">single</span></samp>’. When used in conjunction with the Ada run time, it +causes GCC to use the same thread primitives as Ada uses. This option +is necessary when using both Ada and the back end exception handling, +which is the default for most Ada targets. +<br><dt><code>mach</code><dd>Generic MACH thread support, known to work on NeXTSTEP. (Please note +that the file needed to support this configuration, <samp><span class="file">gthr-mach.h</span></samp>, is +missing and thus this setting will cause a known bootstrap failure.) +<br><dt><code>no</code><dd>This is an alias for ‘<samp><span class="samp">single</span></samp>’. +<br><dt><code>posix</code><dd>Generic POSIX/Unix98 thread support. +<br><dt><code>posix95</code><dd>Generic POSIX/Unix95 thread support. +<br><dt><code>rtems</code><dd>RTEMS thread support. +<br><dt><code>single</code><dd>Disable thread support, should work for all platforms. +<br><dt><code>solaris</code><dd>Sun Solaris 2/Unix International thread support. Only use this if you +really need to use this legacy API instead of the default, ‘<samp><span class="samp">posix</span></samp>’. +<br><dt><code>vxworks</code><dd>VxWorks thread support. +<br><dt><code>win32</code><dd>Microsoft Win32 API thread support. +<br><dt><code>nks</code><dd>Novell Kernel Services thread support. +</dl> + + <br><dt><code>--enable-tls</code><dd>Specify that the target supports TLS (Thread Local Storage). Usually +configure can correctly determine if TLS is supported. In cases where +it guesses incorrectly, TLS can be explicitly enabled or disabled with +<samp><span class="option">--enable-tls</span></samp> or <samp><span class="option">--disable-tls</span></samp>. This can happen if +the assembler supports TLS but the C library does not, or if the +assumptions made by the configure test are incorrect. + + <br><dt><code>--disable-tls</code><dd>Specify that the target does not support TLS. +This is an alias for <samp><span class="option">--enable-tls=no</span></samp>. + + <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. +<var>cpu</var> will be used as the default value of the <samp><span class="option">-mcpu=</span></samp> switch. +This option is only supported on some targets, including ARM, i386, M68k, +PowerPC, and SPARC. The <samp><span class="option">--with-cpu-32</span></samp> and +<samp><span class="option">--with-cpu-64</span></samp> options specify separate default CPUs for +32-bit and 64-bit modes; these options are only supported for i386, +x86-64 and PowerPC. + + <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>, +<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> +options and for <samp><span class="option">-mhard-float</span></samp> or <samp><span class="option">-msoft-float</span></samp>. As with +<samp><span class="option">--with-cpu</span></samp>, which switches will be accepted and acceptable values +of the arguments depend on the target. + + <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>. +This option is only supported on ARM targets. + + <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 +ISA for floating-point arithmetics. You can select either ‘<samp><span class="samp">sse</span></samp>’ which +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. +This option is only supported on i386 and x86-64 targets. + + <br><dt><code>--with-divide=</code><var>type</var><dd>Specify how the compiler should generate code for checking for +division by zero. This option is only supported on the MIPS target. +The possibilities for <var>type</var> are: + <dl> +<dt><code>traps</code><dd>Division by zero checks use conditional traps (this is the default on +systems that support conditional traps). +<br><dt><code>breaks</code><dd>Division by zero checks use the break instruction. +</dl> + + <!-- If you make -with-llsc the default for additional targets, --> + <!-- update the -with-llsc description in the MIPS section below. --> + <br><dt><code>--with-llsc</code><dd>On MIPS targets, make <samp><span class="option">-mllsc</span></samp> the default when no +<samp><span class="option">-mno-llsc</span></samp> option is passed. This is the default for +Linux-based targets, as the kernel will emulate them if the ISA does +not provide them. + + <br><dt><code>--without-llsc</code><dd>On MIPS targets, make <samp><span class="option">-mno-llsc</span></samp> the default when no +<samp><span class="option">-mllsc</span></samp> option is passed. + + <br><dt><code>--with-synci</code><dd>On MIPS targets, make <samp><span class="option">-msynci</span></samp> the default when no +<samp><span class="option">-mno-synci</span></samp> option is passed. + + <br><dt><code>--without-synci</code><dd>On MIPS targets, make <samp><span class="option">-mno-synci</span></samp> the default when no +<samp><span class="option">-msynci</span></samp> option is passed. This is the default. + + <br><dt><code>--with-mips-plt</code><dd>On MIPS targets, make use of copy relocations and PLTs. +These features are extensions to the traditional +SVR4-based MIPS ABIs and require support from GNU binutils +and the runtime C library. + + <br><dt><code>--enable-__cxa_atexit</code><dd>Define if you want to use __cxa_atexit, rather than atexit, to +register C++ destructors for local statics and global objects. +This is essential for fully standards-compliant handling of +destructors, but requires __cxa_atexit in libc. This option is currently +only available on systems with GNU libc. When enabled, this will cause +<samp><span class="option">-fuse-cxa-atexit</span></samp> to be passed by default. + + <br><dt><code>--enable-indirect-function</code><dd>Define if you want to enable the <code>ifunc</code> attribute. This option is +currently only available on systems with GNU libc on certain targets. + + <br><dt><code>--enable-target-optspace</code><dd>Specify that target +libraries should be optimized for code space instead of code speed. +This is the default for the m32r platform. + + <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 +in <samp><var>prefix</var><span class="file">/</span><var>dirname</var><span class="file">/cpp</span></samp>, in addition to <var>bindir</var>. + + <br><dt><code>--enable-comdat</code><dd>Enable COMDAT group support. This is primarily used to override the +automatically detected value. + + <br><dt><code>--enable-initfini-array</code><dd>Force the use of sections <code>.init_array</code> and <code>.fini_array</code> +(instead of <code>.init</code> and <code>.fini</code>) for constructors and +destructors. Option <samp><span class="option">--disable-initfini-array</span></samp> has the +opposite effect. If neither option is specified, the configure script +will try to guess whether the <code>.init_array</code> and +<code>.fini_array</code> sections are supported and, if they are, use them. + + <br><dt><code>--enable-build-with-cxx</code><dd>Build GCC using a C++ compiler rather than a C compiler. This is an +experimental option which may become the default in a later release. + + <br><dt><code>--enable-maintainer-mode</code><dd>The build rules that regenerate the Autoconf and Automake output files as +well as the GCC master message catalog <samp><span class="file">gcc.pot</span></samp> are normally +disabled. This is because it can only be rebuilt if the complete source +tree is present. If you have changed the sources and want to rebuild the +catalog, configuring with <samp><span class="option">--enable-maintainer-mode</span></samp> will enable +this. Note that you need a recent version of the <code>gettext</code> tools +to do so. + + <br><dt><code>--disable-bootstrap</code><dd>For a native build, the default configuration is to perform +a 3-stage bootstrap of the compiler when ‘<samp><span class="samp">make</span></samp>’ is invoked, +testing that GCC can compile itself correctly. If you want to disable +this process, you can configure with <samp><span class="option">--disable-bootstrap</span></samp>. + + <br><dt><code>--enable-bootstrap</code><dd>In special cases, you may want to perform a 3-stage build +even if the target and host triplets are different. +This is possible when the host can run code compiled for +the target (e.g. host is i686-linux, target is i486-linux). +Starting from GCC 4.2, to do this you have to configure explicitly +with <samp><span class="option">--enable-bootstrap</span></samp>. + + <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 +info manuals and man pages that are built from the .texi files are present +in the SVN development tree. When building GCC from that development tree, +or from one of our snapshots, those generated files are placed in your +build directory, which allows for the source to be in a readonly +directory. + + <p>If you configure with <samp><span class="option">--enable-generated-files-in-srcdir</span></samp> then those +generated files will go into the source directory. This is mainly intended +for generating release or prerelease tarballs of the GCC sources, since it +is not a requirement that the users of source releases to have flex, Bison, +or makeinfo. + + <br><dt><code>--enable-version-specific-runtime-libs</code><dd>Specify +that runtime libraries should be installed in the compiler specific +subdirectory (<samp><var>libdir</var><span class="file">/gcc</span></samp>) rather than the usual places. In +addition, ‘<samp><span class="samp">libstdc++</span></samp>’'s include files will be installed into +<samp><var>libdir</var></samp> unless you overruled it by using +<samp><span class="option">--with-gxx-include-dir=</span><var>dirname</var></samp>. Using this option is +particularly useful if you intend to use several versions of GCC in +parallel. This is currently supported by ‘<samp><span class="samp">libgfortran</span></samp>’, +‘<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>’. + + <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 +their runtime libraries should be built. For a list of valid values for +<var>langN</var> you can issue the following command in the +<samp><span class="file">gcc</span></samp> directory of your GCC source tree:<br> + <pre class="smallexample"> grep language= */config-lang.in +</pre> + <p>Currently, you can use any of the following: +<code>all</code>, <code>ada</code>, <code>c</code>, <code>c++</code>, <code>fortran</code>, +<code>go</code>, <code>java</code>, <code>objc</code>, <code>obj-c++</code>. +Building the Ada compiler has special requirements, see below. +If you do not pass this flag, or specify the option <code>all</code>, then all +default languages available in the <samp><span class="file">gcc</span></samp> sub-tree will be configured. +Ada, Go and Objective-C++ are not default languages; the rest are. + + <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 +libraries should be built with the system C compiler during stage 1 of +the bootstrap process, rather than only in later stages with the +bootstrapped C compiler. The list of valid values is the same as for +<samp><span class="option">--enable-languages</span></samp>, and the option <code>all</code> will select all +of the languages enabled by <samp><span class="option">--enable-languages</span></samp>. This option is +primarily useful for GCC development; for instance, when a development +version of the compiler cannot bootstrap due to compiler bugs, or when +one is debugging front ends other than the C front end. When this +option is used, one can then build the target libraries for the +specified languages with the stage-1 compiler by using <samp><span class="command">make +stage1-bubble all-target</span></samp>, or run the testsuite on the stage-1 compiler +for the specified languages using <samp><span class="command">make stage1-start check-gcc</span></samp>. + + <br><dt><code>--disable-libada</code><dd>Specify that the run-time libraries and tools used by GNAT should not +be built. This can be useful for debugging, or for compatibility with +previous Ada build procedures, when it was required to explicitly +do a ‘<samp><span class="samp">make -C gcc gnatlib_and_tools</span></samp>’. + + <br><dt><code>--disable-libssp</code><dd>Specify that the run-time libraries for stack smashing protection +should not be built. + + <br><dt><code>--disable-libquadmath</code><dd>Specify that the GCC quad-precision math library should not be built. +On some systems, the library is required to be linkable when building +the Fortran front end, unless <samp><span class="option">--disable-libquadmath-support</span></samp> +is used. + + <br><dt><code>--disable-libquadmath-support</code><dd>Specify that the Fortran front end and <code>libgfortran</code> do not add +support for <code>libquadmath</code> on systems supporting it. + + <br><dt><code>--disable-libgomp</code><dd>Specify that the run-time libraries used by GOMP should not be built. + + <br><dt><code>--with-dwarf2</code><dd>Specify that the compiler should +use DWARF 2 debugging information as the default. + + <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. +These are compilers that are able to generate either 64-bit or 32-bit +code. Typically, the corresponding 32-bit target, e.g. +powerpc-linux for powerpc64-linux, only generates 32-bit code. This +option enables the 32-bit target to be a bi-arch compiler, which is +useful when you want a bi-arch compiler that defaults to 32-bit, and +you are building a bi-arch or multi-arch binutils in a combined tree. +On mips-linux, this will build a tri-arch compiler (ABI o32/n32/64), +defaulted to o32. +Currently, this option only affects sparc-linux, powerpc-linux, x86-linux +and mips-linux. + + <br><dt><code>--enable-secureplt</code><dd>This option enables <samp><span class="option">-msecure-plt</span></samp> by default for powerpc-linux. +See “RS/6000 and PowerPC Options” in the main manual + + <br><dt><code>--enable-cld</code><dd>This option enables <samp><span class="option">-mcld</span></samp> by default for 32-bit x86 targets. +See “i386 and x86-64 Options” in the main manual + + <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 +to look up installations paths in the registry using the following key: + + <pre class="smallexample"> <code>HKEY_LOCAL_MACHINE\SOFTWARE\Free Software Foundation\</code><var>key</var> +</pre> + <p><var>key</var> defaults to GCC version number, and can be overridden by the +<samp><span class="option">--enable-win32-registry=</span><var>key</var></samp> option. Vendors and distributors +who use custom installers are encouraged to provide a different key, +perhaps one comprised of vendor name and GCC version number, to +avoid conflict with existing installations. This feature is enabled +by default, and can be disabled by <samp><span class="option">--disable-win32-registry</span></samp> +option. This option has no effect on the other hosts. + + <br><dt><code>--nfp</code><dd>Specify that the machine does not have a floating point unit. This +option only applies to ‘<samp><span class="samp">m68k-sun-sunos</span><var>n</var></samp>’. On any other +system, <samp><span class="option">--nfp</span></samp> has no effect. + + <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 +compiler are built with <samp><span class="option">-Werror</span></samp> in bootstrap stage2 and later. +If you don't specify it, <samp><span class="option">-Werror</span></samp> is turned on for the main +development trunk. However it defaults to off for release branches and +final releases. The specific files which get <samp><span class="option">-Werror</span></samp> are +controlled by the Makefiles. + + <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 +consistency checks of the requested complexity. This does not change the +generated code, but adds error checking within the compiler. This will +slow down the compiler and may only work properly if you are building +the compiler with GCC. This is ‘<samp><span class="samp">yes</span></samp>’ by default when building +from SVN or snapshots, but ‘<samp><span class="samp">release</span></samp>’ for releases. The default +for building the stage1 compiler is ‘<samp><span class="samp">yes</span></samp>’. More control +over the checks may be had by specifying <var>list</var>. The categories of +checks available are ‘<samp><span class="samp">yes</span></samp>’ (most common checks +‘<samp><span class="samp">assert,misc,tree,gc,rtlflag,runtime</span></samp>’), ‘<samp><span class="samp">no</span></samp>’ (no checks at +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 +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>’). +Individual checks can be enabled with these flags ‘<samp><span class="samp">assert</span></samp>’, +‘<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>’, +‘<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>’. + + <p>The ‘<samp><span class="samp">valgrind</span></samp>’ check requires the external <samp><span class="command">valgrind</span></samp> +simulator, available from <a href="http://valgrind.org/">http://valgrind.org/</a>. The +‘<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. +To disable all checking, ‘<samp><span class="samp">--disable-checking</span></samp>’ or +‘<samp><span class="samp">--enable-checking=none</span></samp>’ must be explicitly requested. Disabling +assertions will make the compiler and runtime slightly faster but +increase the risk of undetected internal errors causing wrong code to be +generated. + + <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 +compiler will be built with ‘<samp><span class="samp">yes</span></samp>’ checking enabled, otherwise +the stage1 checking flags are the same as specified by +<samp><span class="option">--enable-checking</span></samp>. To build the stage1 compiler with +different checking options use <samp><span class="option">--enable-stage1-checking</span></samp>. +The list of checking options is the same as for <samp><span class="option">--enable-checking</span></samp>. +If your system is too slow or too small to bootstrap a released compiler +with checking for stage1 enabled, you can use ‘<samp><span class="samp">--disable-stage1-checking</span></samp>’ +to disable checking for the stage1 compiler. + + <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 +information, every time it is run. This is for internal development +purposes, and only works when the compiler is being built with gcc. The +<var>level</var> argument controls whether the compiler is built optimized or +not, values are ‘<samp><span class="samp">opt</span></samp>’ and ‘<samp><span class="samp">noopt</span></samp>’. For coverage analysis you +want to disable optimization, for performance analysis you want to +enable optimization. When coverage is enabled, the default level is +without optimization. + + <br><dt><code>--enable-gather-detailed-mem-stats</code><dd>When this option is specified more detailed information on memory +allocation is gathered. This information is printed when using +<samp><span class="option">-fmem-report</span></samp>. + + <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 +used during the compilation process. <var>choice</var> can be one of +‘<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. + + <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), +which lets GCC output diagnostics in languages other than American +English. Native Language Support is enabled by default if not doing a +canadian cross build. The <samp><span class="option">--disable-nls</span></samp> option disables NLS. + + <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 +procedure to prefer its copy of GNU <samp><span class="command">gettext</span></samp>. + + <br><dt><code>--with-catgets</code><dd>If NLS is enabled, and if the host lacks <code>gettext</code> but has the +inferior <code>catgets</code> interface, the GCC build procedure normally +ignores <code>catgets</code> and instead uses GCC's copy of the GNU +<code>gettext</code> library. The <samp><span class="option">--with-catgets</span></samp> option causes the +build procedure to use the host's <code>catgets</code> in this situation. + + <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 +libiconv library files in <samp><var>dir</var><span class="file">/lib</span></samp>. + + <br><dt><code>--enable-obsolete</code><dd>Enable configuration for an obsoleted system. If you attempt to +configure GCC for a system (build, host, or target) which has been +obsoleted, and you do not specify this flag, configure will halt with an +error message. + + <p>All support for systems which have been obsoleted in one release of GCC +is removed entirely in the next major release, unless someone steps +forward to maintain the port. + + <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 +that is in the IEEE 754-2008 standard. This is enabled by default only +on PowerPC, i386, and x86_64 GNU/Linux systems. Other systems may also +support it, but require the user to specifically enable it. You can +optionally control which decimal floating point format is used (either +‘<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) +format is default on i386 and x86_64 systems, and the ‘<samp><span class="samp">dpd</span></samp>’ +(densely packed decimal) format is default on PowerPC systems. + + <br><dt><code>--enable-fixed-point</code><dt><code>--disable-fixed-point</code><dd>Enable (or disable) support for C fixed-point arithmetic. +This option is enabled by default for some targets (such as MIPS) which +have hardware-support for fixed-point operations. On other targets, you +may enable this option manually. + + <br><dt><code>--with-long-double-128</code><dd>Specify if <code>long double</code> type should be 128-bit by default on selected +GNU/Linux architectures. If using <code>--without-long-double-128</code>, +<code>long double</code> will be by default 64-bit, the same as <code>double</code> type. +When neither of these configure options are used, the default will be +128-bit <code>long double</code> when built against GNU C Library 2.4 and later, +64-bit <code>long double</code> otherwise. + + <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 +library and/or the MPC library installed in a standard location and +you want to build GCC, you can explicitly specify the directory where +they are installed (‘<samp><span class="samp">--with-gmp=</span><var>gmpinstalldir</var></samp>’, +‘<samp><span class="samp">--with-mpfr=</span><var>mpfrinstalldir</var></samp>’, +‘<samp><span class="samp">--with-mpc=</span><var>mpcinstalldir</var></samp>’). The +<samp><span class="option">--with-gmp=</span><var>gmpinstalldir</var></samp> option is shorthand for +<samp><span class="option">--with-gmp-lib=</span><var>gmpinstalldir</var><span class="option">/lib</span></samp> and +<samp><span class="option">--with-gmp-include=</span><var>gmpinstalldir</var><span class="option">/include</span></samp>. Likewise the +<samp><span class="option">--with-mpfr=</span><var>mpfrinstalldir</var></samp> option is shorthand for +<samp><span class="option">--with-mpfr-lib=</span><var>mpfrinstalldir</var><span class="option">/lib</span></samp> and +<samp><span class="option">--with-mpfr-include=</span><var>mpfrinstalldir</var><span class="option">/include</span></samp>, also the +<samp><span class="option">--with-mpc=</span><var>mpcinstalldir</var></samp> option is shorthand for +<samp><span class="option">--with-mpc-lib=</span><var>mpcinstalldir</var><span class="option">/lib</span></samp> and +<samp><span class="option">--with-mpc-include=</span><var>mpcinstalldir</var><span class="option">/include</span></samp>. If these +shorthand assumptions are not correct, you can use the explicit +include and lib options directly. You might also need to ensure the +shared libraries can be found by the dynamic linker when building and +using GCC, for example by setting the runtime shared library path +variable (<samp><span class="env">LD_LIBRARY_PATH</span></samp> on GNU/Linux and Solaris systems). + + <p>These flags are applicable to the host platform only. When building +a cross compiler, they will not be used to configure target libraries. + + <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 +libraries installed in a standard location and you want to build GCC, +you can explicitly specify the directory where they are installed +(‘<samp><span class="samp">--with-ppl=</span><var>pplinstalldir</var></samp>’, +‘<samp><span class="samp">--with-cloog=</span><var>clooginstalldir</var></samp>’). The +<samp><span class="option">--with-ppl=</span><var>pplinstalldir</var></samp> option is shorthand for +<samp><span class="option">--with-ppl-lib=</span><var>pplinstalldir</var><span class="option">/lib</span></samp> and +<samp><span class="option">--with-ppl-include=</span><var>pplinstalldir</var><span class="option">/include</span></samp>. Likewise the +<samp><span class="option">--with-cloog=</span><var>clooginstalldir</var></samp> option is shorthand for +<samp><span class="option">--with-cloog-lib=</span><var>clooginstalldir</var><span class="option">/lib</span></samp> and +<samp><span class="option">--with-cloog-include=</span><var>clooginstalldir</var><span class="option">/include</span></samp>. If these +shorthand assumptions are not correct, you can use the explicit +include and lib options directly. + + <p>These flags are applicable to the host platform only. When building +a cross compiler, they will not be used to configure target libraries. + + <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 +to specify how the linker should find the standard C++ library used +internally by PPL. Typical values of <var>linker-args</var> might be +‘<samp><span class="samp">-lstdc++</span></samp>’ or ‘<samp><span class="samp">-Wl,-Bstatic,-lstdc++,-Bdynamic -lm</span></samp>’. If you are +linking with a shared copy of PPL, you probably do not need this +option; shared library dependencies will cause the linker to search +for the standard C++ library automatically. + + <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 +stage 1 of GCC. These are also used when linking GCC if configured with +<samp><span class="option">--disable-bootstrap</span></samp>. By default no special flags are used. + + <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 +of GCC. These are also used when linking GCC if configured with +<samp><span class="option">--disable-bootstrap</span></samp>. The default is the argument to +<samp><span class="option">--with-host-libstdcxx</span></samp>, if specified. + + <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 +stage 2 and later when bootstrapping GCC. If neither –with-boot-libs +nor –with-host-libstdcxx is set to a value, then the default is +‘<samp><span class="samp">-static-libstdc++ -static-libgcc</span></samp>’. + + <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 +and later when bootstrapping GCC. The default is the argument to +<samp><span class="option">--with-host-libstdcxx</span></samp>, if specified. + + <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 +building runtime libraries. ‘<samp><var>map</var></samp>’ is a space-separated +list of maps of the form ‘<samp><var>old</var><span class="samp">=</span><var>new</var></samp>’. + + <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 +links (links performed without the <samp><span class="option">-r</span></samp> or <samp><span class="option">--relocatable</span></samp> +option), if the linker supports it. If you specify +<samp><span class="option">--enable-linker-build-id</span></samp>, but your linker does not +support <samp><span class="option">--build-id</span></samp> option, a warning is issued and the +<samp><span class="option">--enable-linker-build-id</span></samp> option is ignored. The default is off. + + <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 +static data members and inline function local statics. Enabled by +default for a native toolchain with an assembler that accepts it and +GLIBC 2.11 or above, otherwise disabled. + + <br><dt><code>--enable-lto</code><dt><code>--disable-lto</code><dd>Enable support for link-time optimization (LTO). This is enabled by +default, and may be disabled using <samp><span class="option">--disable-lto</span></samp>. + + <br><dt><code>--with-plugin-ld=</code><var>pathname</var><dd>Enable an alternate linker to be used at link-time optimization (LTO) +link time when <samp><span class="option">-fuse-linker-plugin</span></samp> is enabled. +This linker should have plugin support such as gold starting with +version 2.20 or GNU ld starting with version 2.21. +See <samp><span class="option">-fuse-linker-plugin</span></samp> for details. +</dl> + +<h4 class="subheading"><a name="TOC3"></a>Cross-Compiler-Specific Options</h4> + +<p>The following options only apply to building cross compilers. + + <dl> +<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 subset of) the root filesystem of the target operating system. +Target system headers, libraries and run-time object files will be +searched in there. More specifically, this acts as if +<samp><span class="option">--sysroot=</span><var>dir</var></samp> was added to the default options of the built +compiler. The specified directory is not copied into the +install tree, unlike the options <samp><span class="option">--with-headers</span></samp> and +<samp><span class="option">--with-libs</span></samp> that this option obsoletes. The default value, +in case <samp><span class="option">--with-sysroot</span></samp> is not given an argument, is +<samp><span class="option">${gcc_tooldir}/sys-root</span></samp>. If the specified directory is a +subdirectory of <samp><span class="option">${exec_prefix}</span></samp>, then it will be found relative to +the GCC binaries if the installation tree is moved. + + <p>This option affects the system root for the compiler used to build +target libraries (which runs on the build system) and the compiler newly +installed with <code>make install</code>; it does not affect the compiler which is +used to build GCC itself. + + <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 +<samp><span class="option">--with-sysroot</span></samp>) while building target libraries, instead of +the directory specified with <samp><span class="option">--with-sysroot</span></samp>. This option is +only useful when you are already using <samp><span class="option">--with-sysroot</span></samp>. You +can use <samp><span class="option">--with-build-sysroot</span></samp> when you are configuring with +<samp><span class="option">--prefix</span></samp> set to a directory that is different from the one in +which you are installing GCC and your target libraries. + + <p>This option affects the system root for the compiler used to build +target libraries (which runs on the build system); it does not affect +the compiler which is used to build GCC itself. + + <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>. +Specifies that target headers are available when building a cross compiler. +The <var>dir</var> argument specifies a directory which has the target include +files. These include files will be copied into the <samp><span class="file">gcc</span></samp> install +directory. <em>This option with the </em><var>dir</var><em> argument is required</em> when +building a cross compiler, if <samp><var>prefix</var><span class="file">/</span><var>target</var><span class="file">/sys-include</span></samp> +doesn't pre-exist. If <samp><var>prefix</var><span class="file">/</span><var>target</var><span class="file">/sys-include</span></samp> does +pre-exist, the <var>dir</var> argument may be omitted. <samp><span class="command">fixincludes</span></samp> +will be run on these files to make them compatible with GCC. + + <br><dt><code>--without-headers</code><dd>Tells GCC not use any target headers from a libc when building a cross +compiler. When crossing to GNU/Linux, you need the headers so GCC +can build the exception handling for libgcc. + + <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>. +Specifies a list of directories which contain the target runtime +libraries. These libraries will be copied into the <samp><span class="file">gcc</span></samp> install +directory. If the directory list is omitted, this option has no +effect. + + <br><dt><code>--with-newlib</code><dd>Specifies that ‘<samp><span class="samp">newlib</span></samp>’ is +being used as the target C library. This causes <code>__eprintf</code> to be +omitted from <samp><span class="file">libgcc.a</span></samp> on the assumption that it will be provided by +‘<samp><span class="samp">newlib</span></samp>’. + + <br><dt><code>--with-build-time-tools=</code><var>dir</var><dd>Specifies where to find the set of target tools (assembler, linker, etc.) +that will be used while building GCC itself. This option can be useful +if the directory layouts are different between the system you are building +GCC on, and the system where you will deploy it. + + <p>For example, on an ‘<samp><span class="samp">ia64-hp-hpux</span></samp>’ system, you may have the GNU +assembler and linker in <samp><span class="file">/usr/bin</span></samp>, and the native tools in a +different path, and build a toolchain that expects to find the +native tools in <samp><span class="file">/usr/bin</span></samp>. + + <p>When you use this option, you should ensure that <var>dir</var> includes +<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>, +<samp><span class="command">ranlib</span></samp> and <samp><span class="command">strip</span></samp> if necessary, and possibly +<samp><span class="command">objdump</span></samp>. Otherwise, GCC may use an inconsistent set of +tools. +</dl> + +<h4 class="subheading"><a name="TOC4"></a>Java-Specific Options</h4> + +<p>The following option applies to the build of the Java front end. + + <dl> +<dt><code>--disable-libgcj</code><dd>Specify that the run-time libraries +used by GCJ should not be built. This is useful in case you intend +to use GCJ with some other run-time, or you're going to install it +separately, or it just happens not to build on your particular +machine. In general, if the Java front end is enabled, the GCJ +libraries will be enabled too, unless they're known to not work on +the target platform. If GCJ is enabled but ‘<samp><span class="samp">libgcj</span></samp>’ isn't built, you +may need to port it; in this case, before modifying the top-level +<samp><span class="file">configure.in</span></samp> so that ‘<samp><span class="samp">libgcj</span></samp>’ is enabled by default on this platform, +you may use <samp><span class="option">--enable-libgcj</span></samp> to override the default. + + </dl> + + <p>The following options apply to building ‘<samp><span class="samp">libgcj</span></samp>’. + +<h5 class="subsubheading"><a name="TOC5"></a>General Options</h5> + + <dl> +<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 +<samp><span class="file">.java</span></samp> source files to <samp><span class="file">.class</span></samp>. Instead, it will use the +<samp><span class="file">.class</span></samp> files from the source tree. If you use this option you +must have executables named <samp><span class="command">ecj1</span></samp> and <samp><span class="command">gjavah</span></samp> in your path +for use by the build. You must use this option if you intend to +modify any <samp><span class="file">.java</span></samp> files in <samp><span class="file">libjava</span></samp>. + + <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 +‘<samp><span class="samp">java.home</span></samp>’ system property. It is also used to set +‘<samp><span class="samp">sun.boot.class.path</span></samp>’ to <samp><var>dirname</var><span class="file">/lib/rt.jar</span></samp>. By +default ‘<samp><span class="samp">java.home</span></samp>’ is set to <samp><var>prefix</var></samp> and +‘<samp><span class="samp">sun.boot.class.path</span></samp>’ to +<samp><var>datadir</var><span class="file">/java/libgcj-</span><var>version</var><span class="file">.jar</span></samp>. + + <br><dt><code>--with-ecj-jar=</code><var>filename</var><dd>This option can be used to specify the location of an external jar +file containing the Eclipse Java compiler. A specially modified +version of this compiler is used by <samp><span class="command">gcj</span></samp> to parse +<samp><span class="file">.java</span></samp> source files. If this option is given, the +‘<samp><span class="samp">libjava</span></samp>’ build will create and install an <samp><span class="file">ecj1</span></samp> executable +which uses this jar file at runtime. + + <p>If this option is not given, but an <samp><span class="file">ecj.jar</span></samp> file is found in +the topmost source tree at configure time, then the ‘<samp><span class="samp">libgcj</span></samp>’ +build will create and install <samp><span class="file">ecj1</span></samp>, and will also install the +discovered <samp><span class="file">ecj.jar</span></samp> into a suitable place in the install tree. + + <p>If <samp><span class="file">ecj1</span></samp> is not installed, then the user will have to supply one +on his path in order for <samp><span class="command">gcj</span></samp> to properly parse <samp><span class="file">.java</span></samp> +source files. A suitable jar is available from +<a href="ftp://sourceware.org/pub/java/">ftp://sourceware.org/pub/java/</a>. + + <br><dt><code>--disable-getenv-properties</code><dd>Don't set system properties from <samp><span class="env">GCJ_PROPERTIES</span></samp>. + + <br><dt><code>--enable-hash-synchronization</code><dd>Use a global hash table for monitor locks. Ordinarily, +‘<samp><span class="samp">libgcj</span></samp>’'s ‘<samp><span class="samp">configure</span></samp>’ script automatically makes +the correct choice for this option for your platform. Only use +this if you know you need the library to be configured differently. + + <br><dt><code>--enable-interpreter</code><dd>Enable the Java interpreter. The interpreter is automatically +enabled by default on all platforms that support it. This option +is really only useful if you want to disable the interpreter +(using <samp><span class="option">--disable-interpreter</span></samp>). + + <br><dt><code>--disable-java-net</code><dd>Disable java.net. This disables the native part of java.net only, +using non-functional stubs for native method implementations. + + <br><dt><code>--disable-jvmpi</code><dd>Disable JVMPI support. + + <br><dt><code>--disable-libgcj-bc</code><dd>Disable BC ABI compilation of certain parts of libgcj. By default, +some portions of libgcj are compiled with <samp><span class="option">-findirect-dispatch</span></samp> +and <samp><span class="option">-fno-indirect-classes</span></samp>, allowing them to be overridden at +run-time. + + <p>If <samp><span class="option">--disable-libgcj-bc</span></samp> is specified, libgcj is built without +these options. This allows the compile-time linker to resolve +dependencies when statically linking to libgcj. However it makes it +impossible to override the affected portions of libgcj at run-time. + + <br><dt><code>--enable-reduced-reflection</code><dd>Build most of libgcj with <samp><span class="option">-freduced-reflection</span></samp>. This reduces +the size of libgcj at the expense of not being able to do accurate +reflection on the classes it contains. This option is safe if you +know that code using libgcj will never use reflection on the standard +runtime classes in libgcj (including using serialization, RMI or CORBA). + + <br><dt><code>--with-ecos</code><dd>Enable runtime eCos target support. + + <br><dt><code>--without-libffi</code><dd>Don't use ‘<samp><span class="samp">libffi</span></samp>’. This will disable the interpreter and JNI +support as well, as these require ‘<samp><span class="samp">libffi</span></samp>’ to work. + + <br><dt><code>--enable-libgcj-debug</code><dd>Enable runtime debugging code. + + <br><dt><code>--enable-libgcj-multifile</code><dd>If specified, causes all <samp><span class="file">.java</span></samp> source files to be +compiled into <samp><span class="file">.class</span></samp> files in one invocation of +‘<samp><span class="samp">gcj</span></samp>’. This can speed up build time, but is more +resource-intensive. If this option is unspecified or +disabled, ‘<samp><span class="samp">gcj</span></samp>’ is invoked once for each <samp><span class="file">.java</span></samp> +file to compile into a <samp><span class="file">.class</span></samp> file. + + <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>. + + <br><dt><code>--enable-sjlj-exceptions</code><dd>Force use of the <code>setjmp</code>/<code>longjmp</code>-based scheme for exceptions. +‘<samp><span class="samp">configure</span></samp>’ ordinarily picks the correct value based on the platform. +Only use this option if you are sure you need a different setting. + + <br><dt><code>--with-system-zlib</code><dd>Use installed ‘<samp><span class="samp">zlib</span></samp>’ rather than that included with GCC. + + <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 +characters and the Win32 API. + + <br><dt><code>--enable-java-home</code><dd>If enabled, this creates a JPackage compatible SDK environment during install. +Note that if –enable-java-home is used, –with-arch-directory=ARCH must also +be specified. + + <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 +environment created when –enable-java-home is passed. Typical names for this +directory include i386, amd64, ia64, etc. + + <br><dt><code>--with-os-directory=DIR</code><dd>Specifies the OS directory for the SDK include directory. This is set to auto +detect, and is typically 'linux'. + + <br><dt><code>--with-origin-name=NAME</code><dd>Specifies the JPackage origin name. This defaults to the 'gcj' in +java-1.5.0-gcj. + + <br><dt><code>--with-arch-suffix=SUFFIX</code><dd>Specifies the suffix for the sdk directory. Defaults to the empty string. +Examples include '.x86_64' in 'java-1.5.0-gcj-1.5.0.0.x86_64'. + + <br><dt><code>--with-jvm-root-dir=DIR</code><dd>Specifies where to install the SDK. Default is $(prefix)/lib/jvm. + + <br><dt><code>--with-jvm-jar-dir=DIR</code><dd>Specifies where to install jars. Default is $(prefix)/lib/jvm-exports. + + <br><dt><code>--with-python-dir=DIR</code><dd>Specifies where to install the Python modules used for aot-compile. DIR should +not include the prefix used in installation. For example, if the Python modules +are to be installed in /usr/lib/python2.5/site-packages, then +–with-python-dir=/lib/python2.5/site-packages should be passed. If this is +not specified, then the Python modules are installed in $(prefix)/share/python. + + <br><dt><code>--enable-aot-compile-rpm</code><dd>Adds aot-compile-rpm to the list of installed scripts. + + <br><dt><code>--enable-browser-plugin</code><dd>Build the gcjwebplugin web browser plugin. + + <dl> +<dt><code>ansi</code><dd>Use the single-byte <code>char</code> and the Win32 A functions natively, +translating to and from UNICODE when using these functions. If +unspecified, this is the default. + + <br><dt><code>unicows</code><dd>Use the <code>WCHAR</code> and Win32 W functions natively. Adds +<code>-lunicows</code> to <samp><span class="file">libgcj.spec</span></samp> to link with ‘<samp><span class="samp">libunicows</span></samp>’. +<samp><span class="file">unicows.dll</span></samp> needs to be deployed on Microsoft Windows 9X machines +running built executables. <samp><span class="file">libunicows.a</span></samp>, an open-source +import library around Microsoft's <code>unicows.dll</code>, is obtained from +<a href="http://libunicows.sourceforge.net/">http://libunicows.sourceforge.net/</a>, which also gives details +on getting <samp><span class="file">unicows.dll</span></samp> from Microsoft. + + <br><dt><code>unicode</code><dd>Use the <code>WCHAR</code> and Win32 W functions natively. Does <em>not</em> +add <code>-lunicows</code> to <samp><span class="file">libgcj.spec</span></samp>. The built executables will +only run on Microsoft Windows NT and above. +</dl> + </dl> + +<h5 class="subsubheading"><a name="TOC6"></a>AWT-Specific Options</h5> + + <dl> +<dt><code>--with-x</code><dd>Use the X Window System. + + <br><dt><code>--enable-java-awt=PEER(S)</code><dd>Specifies the AWT peer library or libraries to build alongside +‘<samp><span class="samp">libgcj</span></samp>’. If this option is unspecified or disabled, AWT +will be non-functional. Current valid values are <samp><span class="option">gtk</span></samp> and +<samp><span class="option">xlib</span></samp>. Multiple libraries should be separated by a +comma (i.e. <samp><span class="option">--enable-java-awt=gtk,xlib</span></samp>). + + <br><dt><code>--enable-gtk-cairo</code><dd>Build the cairo Graphics2D implementation on GTK. + + <br><dt><code>--enable-java-gc=TYPE</code><dd>Choose garbage collector. Defaults to <samp><span class="option">boehm</span></samp> if unspecified. + + <br><dt><code>--disable-gtktest</code><dd>Do not try to compile and run a test GTK+ program. + + <br><dt><code>--disable-glibtest</code><dd>Do not try to compile and run a test GLIB program. + + <br><dt><code>--with-libart-prefix=PFX</code><dd>Prefix where libart is installed (optional). + + <br><dt><code>--with-libart-exec-prefix=PFX</code><dd>Exec prefix where libart is installed (optional). + + <br><dt><code>--disable-libarttest</code><dd>Do not try to compile and run a test libart program. + +</dl> + +<h5 class="subsubheading"><a name="TOC7"></a>Overriding <samp><span class="command">configure</span></samp> test results</h5> + +<p>Sometimes, it might be necessary to override the result of some +<samp><span class="command">configure</span></samp> test, for example in order to ease porting to a new +system or work around a bug in a test. The toplevel <samp><span class="command">configure</span></samp> +script provides three variables for this: + + <dl> +<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> +scripts. + + <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> +scripts. + + <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> +scripts. + + </dl> + + <p>In order to avoid shell and <samp><span class="command">make</span></samp> quoting issues for complex +overrides, you can pass a setting for <samp><span class="env">CONFIG_SITE</span></samp> and set +variables in the site file. + + <p><hr /> +<p><a href="./index.html">Return to the GCC Installation page</a> + +<!-- ***Building**************************************************************** --> +<!-- ***Testing***************************************************************** --> +<!-- ***Final install*********************************************************** --> +<!-- ***Binaries**************************************************************** --> +<!-- ***Specific**************************************************************** --> +<!-- ***Old documentation****************************************************** --> +<!-- ***GFDL******************************************************************** --> +<!-- *************************************************************************** --> +<!-- Part 6 The End of the Document --> +</body></html> + |