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-<title>Prerequisites for GCC</title>
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-<h1 class="settitle">Prerequisites for GCC</h1>
-<a name="index-Prerequisites-1"></a>
-GCC requires that various tools and packages be available for use in the
-build procedure. Modifying GCC sources requires additional tools
-described below.
-
-<h3 class="heading"><a name="TOC0"></a>Tools/packages necessary for building GCC</h3>
-
- <dl>
-<dt>ISO C++98 compiler<dd>Necessary to bootstrap GCC, although versions of GCC prior
-to 4.8 also allow bootstrapping with a ISO C89 compiler and versions
-of GCC prior to 3.4 also allow bootstrapping with a traditional
-(K&amp;R) C compiler.
-
- <p>To build all languages in a cross-compiler or other configuration where
-3-stage bootstrap is not performed, you need to start with an existing
-GCC binary (version 3.4 or later) because source code for language
-frontends other than C might use GCC extensions.
-
- <p>Note that to bootstrap GCC with versions of GCC earlier than 3.4, you
-may need to use <samp><span class="option">--disable-stage1-checking</span></samp>, though
-bootstrapping the compiler with such earlier compilers is strongly
-discouraged.
-
- <br><dt>GNAT<dd>
-In order to build the Ada compiler (GNAT) you must already have GNAT
-installed because portions of the Ada frontend are written in Ada (with
-GNAT extensions.) Refer to the Ada installation instructions for more
-specific information.
-
- <br><dt>A &ldquo;working&rdquo; POSIX compatible shell, or GNU bash<dd>
-Necessary when running <samp><span class="command">configure</span></samp> because some
-<samp><span class="command">/bin/sh</span></samp> shells have bugs and may crash when configuring the
-target libraries. In other cases, <samp><span class="command">/bin/sh</span></samp> or <samp><span class="command">ksh</span></samp>
-have disastrous corner-case performance problems. This
-can cause target <samp><span class="command">configure</span></samp> runs to literally take days to
-complete in some cases.
-
- <p>So on some platforms <samp><span class="command">/bin/ksh</span></samp> is sufficient, on others it
-isn't. See the host/target specific instructions for your platform, or
-use <samp><span class="command">bash</span></samp> to be sure. Then set <samp><span class="env">CONFIG_SHELL</span></samp> in your
-environment to your &ldquo;good&rdquo; shell prior to running
-<samp><span class="command">configure</span></samp>/<samp><span class="command">make</span></samp>.
-
- <p><samp><span class="command">zsh</span></samp> is not a fully compliant POSIX shell and will not
-work when configuring GCC.
-
- <br><dt>A POSIX or SVR4 awk<dd>
-Necessary for creating some of the generated source files for GCC.
-If in doubt, use a recent GNU awk version, as some of the older ones
-are broken. GNU awk version 3.1.5 is known to work.
-
- <br><dt>GNU binutils<dd>
-Necessary in some circumstances, optional in others. See the
-host/target specific instructions for your platform for the exact
-requirements.
-
- <br><dt>gzip version 1.2.4 (or later) or<dt>bzip2 version 1.0.2 (or later)<dd>
-Necessary to uncompress GCC <samp><span class="command">tar</span></samp> files when source code is
-obtained via FTP mirror sites.
-
- <br><dt>GNU make version 3.80 (or later)<dd>
-You must have GNU make installed to build GCC.
-
- <br><dt>GNU tar version 1.14 (or later)<dd>
-Necessary (only on some platforms) to untar the source code. Many
-systems' <samp><span class="command">tar</span></samp> programs will also work, only try GNU
-<samp><span class="command">tar</span></samp> if you have problems.
-
- <br><dt>Perl version 5.6.1 (or later)<dd>
-Necessary when targeting Darwin, building &lsquo;<samp><span class="samp">libstdc++</span></samp>&rsquo;,
-and not using <samp><span class="option">--disable-symvers</span></samp>.
-Necessary when targeting Solaris 2 with Sun <samp><span class="command">ld</span></samp> and not using
-<samp><span class="option">--disable-symvers</span></samp>. The bundled <samp><span class="command">perl</span></samp> in Solaris&nbsp;8
-and up works.
-
- <p>Necessary when regenerating <samp><span class="file">Makefile</span></samp> dependencies in libiberty.
-Necessary when regenerating <samp><span class="file">libiberty/functions.texi</span></samp>.
-Necessary when generating manpages from Texinfo manuals.
-Used by various scripts to generate some files included in SVN (mainly
-Unicode-related and rarely changing) from source tables.
-
- <br><dt><samp><span class="command">jar</span></samp>, or InfoZIP (<samp><span class="command">zip</span></samp> and <samp><span class="command">unzip</span></samp>)<dd>
-Necessary to build libgcj, the GCJ runtime.
-
-</dl>
-
- <p>Several support libraries are necessary to build GCC, some are required,
-others optional. While any sufficiently new version of required tools
-usually work, library requirements are generally stricter. Newer
-versions may work in some cases, but it's safer to use the exact
-versions documented. We appreciate bug reports about problems with
-newer versions, though. If your OS vendor provides packages for the
-support libraries then using those packages may be the simplest way to
-install the libraries.
-
- <dl>
-<dt>GNU Multiple Precision Library (GMP) version 4.3.2 (or later)<dd>
-Necessary to build GCC. If a GMP source distribution is found in a
-subdirectory of your GCC sources named <samp><span class="file">gmp</span></samp>, it will be built
-together with GCC. Alternatively, if GMP is already installed but it
-is not in your library search path, you will have to configure with the
-<samp><span class="option">--with-gmp</span></samp> configure option. See also <samp><span class="option">--with-gmp-lib</span></samp>
-and <samp><span class="option">--with-gmp-include</span></samp>.
-
- <br><dt>MPFR Library version 2.4.2 (or later)<dd>
-Necessary to build GCC. It can be downloaded from
-<a href="http://www.mpfr.org/">http://www.mpfr.org/</a>. If an MPFR source distribution is found
-in a subdirectory of your GCC sources named <samp><span class="file">mpfr</span></samp>, it will be
-built together with GCC. Alternatively, if MPFR is already installed
-but it is not in your default library search path, the
-<samp><span class="option">--with-mpfr</span></samp> configure option should be used. See also
-<samp><span class="option">--with-mpfr-lib</span></samp> and <samp><span class="option">--with-mpfr-include</span></samp>.
-
- <br><dt>MPC Library version 0.8.1 (or later)<dd>
-Necessary to build GCC. It can be downloaded from
-<a href="http://www.multiprecision.org/">http://www.multiprecision.org/</a>. If an MPC source distribution
-is found in a subdirectory of your GCC sources named <samp><span class="file">mpc</span></samp>, it
-will be built together with GCC. Alternatively, if MPC is already
-installed but it is not in your default library search path, the
-<samp><span class="option">--with-mpc</span></samp> configure option should be used. See also
-<samp><span class="option">--with-mpc-lib</span></samp> and <samp><span class="option">--with-mpc-include</span></samp>.
-
- <br><dt>ISL Library version 0.11.1<dd>
-Necessary to build GCC with the Graphite loop optimizations.
-It can be downloaded from <a href="ftp://gcc.gnu.org/pub/gcc/infrastructure/">ftp://gcc.gnu.org/pub/gcc/infrastructure/</a>
-as <samp><span class="file">isl-0.11.1.tar.bz2</span></samp>.
-
- <p>The <samp><span class="option">--with-isl</span></samp> configure option should be used if ISL is not
-installed in your default library search path.
-
- <br><dt>CLooG 0.18.0<dd>
-Necessary to build GCC with the Graphite loop optimizations. It can be
-downloaded from <a href="ftp://gcc.gnu.org/pub/gcc/infrastructure/">ftp://gcc.gnu.org/pub/gcc/infrastructure/</a> as
-<samp><span class="file">cloog-0.18.0.tar.gz</span></samp>. The <samp><span class="option">--with-cloog</span></samp> configure option should
-be used if CLooG is not installed in your default library search path.
-CLooG needs to be built against ISL 0.11.1. Use <samp><span class="option">--with-isl=system</span></samp>
-to direct CLooG to pick up an already installed ISL, otherwise it will use
-ISL 0.11.1 as bundled with CLooG. CLooG needs to be configured to use GMP
-internally, use <samp><span class="option">--with-bits=gmp</span></samp> to direct it to do that.
-
- </dl>
-
-<h3 class="heading"><a name="TOC1"></a>Tools/packages necessary for modifying GCC</h3>
-
- <dl>
-<dt>autoconf version 2.64<dt>GNU m4 version 1.4.6 (or later)<dd>
-Necessary when modifying <samp><span class="file">configure.ac</span></samp>, <samp><span class="file">aclocal.m4</span></samp>, etc.
-to regenerate <samp><span class="file">configure</span></samp> and <samp><span class="file">config.in</span></samp> files.
-
- <br><dt>automake version 1.11.1<dd>
-Necessary when modifying a <samp><span class="file">Makefile.am</span></samp> file to regenerate its
-associated <samp><span class="file">Makefile.in</span></samp>.
-
- <p>Much of GCC does not use automake, so directly edit the <samp><span class="file">Makefile.in</span></samp>
-file. Specifically this applies to the <samp><span class="file">gcc</span></samp>, <samp><span class="file">intl</span></samp>,
-<samp><span class="file">libcpp</span></samp>, <samp><span class="file">libiberty</span></samp>, <samp><span class="file">libobjc</span></samp> directories as well
-as any of their subdirectories.
-
- <p>For directories that use automake, GCC requires the latest release in
-the 1.11 series, which is currently 1.11.1. When regenerating a directory
-to a newer version, please update all the directories using an older 1.11
-to the latest released version.
-
- <br><dt>gettext version 0.14.5 (or later)<dd>
-Needed to regenerate <samp><span class="file">gcc.pot</span></samp>.
-
- <br><dt>gperf version 2.7.2 (or later)<dd>
-Necessary when modifying <samp><span class="command">gperf</span></samp> input files, e.g.
-<samp><span class="file">gcc/cp/cfns.gperf</span></samp> to regenerate its associated header file, e.g.
-<samp><span class="file">gcc/cp/cfns.h</span></samp>.
-
- <br><dt>DejaGnu 1.4.4<dt>Expect<dt>Tcl<dd>
-Necessary to run the GCC testsuite; see the section on testing for details.
-
- <br><dt>autogen version 5.5.4 (or later) and<dt>guile version 1.4.1 (or later)<dd>
-Necessary to regenerate <samp><span class="file">fixinc/fixincl.x</span></samp> from
-<samp><span class="file">fixinc/inclhack.def</span></samp> and <samp><span class="file">fixinc/*.tpl</span></samp>.
-
- <p>Necessary to run &lsquo;<samp><span class="samp">make check</span></samp>&rsquo; for <samp><span class="file">fixinc</span></samp>.
-
- <p>Necessary to regenerate the top level <samp><span class="file">Makefile.in</span></samp> file from
-<samp><span class="file">Makefile.tpl</span></samp> and <samp><span class="file">Makefile.def</span></samp>.
-
- <br><dt>Flex version 2.5.4 (or later)<dd>
-Necessary when modifying <samp><span class="file">*.l</span></samp> files.
-
- <p>Necessary to build GCC during development because the generated output
-files are not included in the SVN repository. They are included in
-releases.
-
- <br><dt>Texinfo version 4.7 (or later)<dd>
-Necessary for running <samp><span class="command">makeinfo</span></samp> when modifying <samp><span class="file">*.texi</span></samp>
-files to test your changes.
-
- <p>Necessary for running <samp><span class="command">make dvi</span></samp> or <samp><span class="command">make pdf</span></samp> to
-create printable documentation in DVI or PDF format. Texinfo version
-4.8 or later is required for <samp><span class="command">make pdf</span></samp>.
-
- <p>Necessary to build GCC documentation during development because the
-generated output files are not included in the SVN repository. They are
-included in releases.
-
- <br><dt>TeX (any working version)<dd>
-Necessary for running <samp><span class="command">texi2dvi</span></samp> and <samp><span class="command">texi2pdf</span></samp>, which
-are used when running <samp><span class="command">make dvi</span></samp> or <samp><span class="command">make pdf</span></samp> to create
-DVI or PDF files, respectively.
-
- <br><dt>SVN (any version)<dt>SSH (any version)<dd>
-Necessary to access the SVN repository. Public releases and weekly
-snapshots of the development sources are also available via FTP.
-
- <br><dt>GNU diffutils version 2.7 (or later)<dd>
-Useful when submitting patches for the GCC source code.
-
- <br><dt>patch version 2.5.4 (or later)<dd>
-Necessary when applying patches, created with <samp><span class="command">diff</span></samp>, to one's
-own sources.
-
- <br><dt>ecj1<dt>gjavah<dd>
-If you wish to modify <samp><span class="file">.java</span></samp> files in libjava, you will need to
-configure with <samp><span class="option">--enable-java-maintainer-mode</span></samp>, and you will need
-to have executables named <samp><span class="command">ecj1</span></samp> and <samp><span class="command">gjavah</span></samp> in your path.
-The <samp><span class="command">ecj1</span></samp> executable should run the Eclipse Java compiler via
-the GCC-specific entry point. You can download a suitable jar from
-<a href="ftp://sourceware.org/pub/java/">ftp://sourceware.org/pub/java/</a>, or by running the script
-<samp><span class="command">contrib/download_ecj</span></samp>.
-
- <br><dt>antlr.jar version 2.7.1 (or later)<dt>antlr binary<dd>
-If you wish to build the <samp><span class="command">gjdoc</span></samp> binary in libjava, you will
-need to have an <samp><span class="file">antlr.jar</span></samp> library available. The library is
-searched for in system locations but can be specified with
-<samp><span class="option">--with-antlr-jar=</span></samp> instead. When configuring with
-<samp><span class="option">--enable-java-maintainer-mode</span></samp>, you will need to have one of
-the executables named <samp><span class="command">cantlr</span></samp>, <samp><span class="command">runantlr</span></samp> or
-<samp><span class="command">antlr</span></samp> in your path.
-
-</dl>
-
- <p><hr />
-<p><a href="./index.html">Return to the GCC Installation page</a>
-
-<!-- ***Downloading the source************************************************** -->
-<!-- ***Configuration*********************************************************** -->
-<!-- ***Building**************************************************************** -->
-<!-- ***Testing***************************************************************** -->
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