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<h1 class="settitle">Prerequisites for GCC</h1>
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<a name="index-Prerequisites-1"></a>
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GCC requires that various tools and packages be available for use in the
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build procedure.  Modifying GCC sources requires additional tools
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described below.
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<h3 class="heading"><a name="TOC0"></a>Tools/packages necessary for building GCC</h3>
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     <dl>
53 
<dt>ISO C90 compiler<dd>Necessary to bootstrap GCC, although versions of GCC prior
54 
to 3.4 also allow bootstrapping with a traditional (K&amp;R) C compiler.
55 
 
56 
     <p>To build all languages in a cross-compiler or other configuration where
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3-stage bootstrap is not performed, you need to start with an existing
58 
GCC binary (version 2.95 or later) because source code for language
59 
frontends other than C might use GCC extensions.
60 
 
61 
     <br><dt>GNAT<dd>
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In order to build the Ada compiler (GNAT) you must already have GNAT
63 
installed because portions of the Ada frontend are written in Ada (with
64 
GNAT extensions.)  Refer to the Ada installation instructions for more
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specific information.
66 
 
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     <br><dt>A &ldquo;working&rdquo; POSIX compatible shell, or GNU bash<dd>
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Necessary when running <samp><span class="command">configure</span></samp> because some
69 
<samp><span class="command">/bin/sh</span></samp> shells have bugs and may crash when configuring the
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target libraries.  In other cases, <samp><span class="command">/bin/sh</span></samp> or <samp><span class="command">ksh</span></samp>
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have disastrous corner-case performance problems.  This
72 
can cause target <samp><span class="command">configure</span></samp> runs to literally take days to
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complete in some cases.
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     <p>So on some platforms <samp><span class="command">/bin/ksh</span></samp> is sufficient, on others it
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isn't.  See the host/target specific instructions for your platform, or
77 
use <samp><span class="command">bash</span></samp> to be sure.  Then set <samp><span class="env">CONFIG_SHELL</span></samp> in your
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environment to your &ldquo;good&rdquo; shell prior to running
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<samp><span class="command">configure</span></samp>/<samp><span class="command">make</span></samp>.
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     <p><samp><span class="command">zsh</span></samp> is not a fully compliant POSIX shell and will not
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work when configuring GCC.
83 
 
84 
     <br><dt>A POSIX or SVR4 awk<dd>
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Necessary for creating some of the generated source files for GCC.
86 
If in doubt, use a recent GNU awk version, as some of the older ones
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are broken.  GNU awk version 3.1.5 is known to work.
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     <br><dt>GNU binutils<dd>
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Necessary in some circumstances, optional in others.  See the
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host/target specific instructions for your platform for the exact
92 
requirements.
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94 
     <br><dt>gzip version 1.2.4 (or later) or<dt>bzip2 version 1.0.2 (or later)<dd>
95 
Necessary to uncompress GCC <samp><span class="command">tar</span></samp> files when source code is
96 
obtained via FTP mirror sites.
97 
 
98 
     <br><dt>GNU make version 3.80 (or later)<dd>
99 
You must have GNU make installed to build GCC.
100 
 
101 
     <br><dt>GNU tar version 1.14 (or later)<dd>
102 
Necessary (only on some platforms) to untar the source code.  Many
103 
systems' <samp><span class="command">tar</span></samp> programs will also work, only try GNU
104 
<samp><span class="command">tar</span></samp> if you have problems.
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     <br><dt>GNU Multiple Precision Library (GMP) version 4.3.2 (or later)<dd>
107 
Necessary to build GCC.  If you do not have it installed in your
108 
library search path, you will have to configure with the
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<samp><span class="option">--with-gmp</span></samp> configure option.  See also <samp><span class="option">--with-gmp-lib</span></samp>
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and <samp><span class="option">--with-gmp-include</span></samp>.  Alternatively, if a GMP source
111 
distribution is found in a subdirectory of your GCC sources named
112 
<samp><span class="file">gmp</span></samp>, it will be built together with GCC.
113 
 
114 
     <br><dt>MPFR Library version 2.4.2 (or later)<dd>
115 
Necessary to build GCC.  It can be downloaded from
116 
<a href="http://www.mpfr.org/">http://www.mpfr.org/</a>.  The <samp><span class="option">--with-mpfr</span></samp> configure
117 
option should be used if your MPFR Library is not installed in your
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default library search path.  See also <samp><span class="option">--with-mpfr-lib</span></samp> and
119 
<samp><span class="option">--with-mpfr-include</span></samp>.  Alternatively, if a MPFR source
120 
distribution is found in a subdirectory of your GCC sources named
121 
<samp><span class="file">mpfr</span></samp>, it will be built together with GCC.
122 
 
123 
     <br><dt>MPC Library version 0.8.1 (or later)<dd>
124 
Necessary to build GCC.  It can be downloaded from
125 
<a href="http://www.multiprecision.org/">http://www.multiprecision.org/</a>.  The <samp><span class="option">--with-mpc</span></samp>
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configure option should be used if your MPC Library is not installed
127 
in your default library search path.  See also <samp><span class="option">--with-mpc-lib</span></samp>
128 
and <samp><span class="option">--with-mpc-include</span></samp>.  Alternatively, if an MPC source
129 
distribution is found in a subdirectory of your GCC sources named
130 
<samp><span class="file">mpc</span></samp>, it will be built together with GCC.
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132 
     <br><dt>Parma Polyhedra Library (PPL) version 0.10<dd>
133 
Necessary to build GCC with the Graphite loop optimizations.
134 
It can be downloaded from <a href="http://www.cs.unipr.it/ppl/Download/">http://www.cs.unipr.it/ppl/Download/</a>.
135 
 
136 
     <p>The <samp><span class="option">--with-ppl</span></samp> configure option should be used if PPL is not
137 
installed in your default library search path.
138 
 
139 
     <br><dt>CLooG-PPL version 0.15<dd>
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Necessary to build GCC with the Graphite loop optimizations.  It can
141 
be downloaded from <a href="ftp://gcc.gnu.org/pub/gcc/infrastructure/">ftp://gcc.gnu.org/pub/gcc/infrastructure/</a>.
142 
The code in <samp><span class="file">cloog-ppl-0.15.tar.gz</span></samp> comes from a branch of CLooG
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available from <a href="http://repo.or.cz/w/cloog-ppl.git">http://repo.or.cz/w/cloog-ppl.git</a>.  CLooG-PPL
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should be configured with <samp><span class="option">--with-ppl</span></samp>.
145 
 
146 
     <p>The <samp><span class="option">--with-cloog</span></samp> configure option should be used if CLooG is
147 
not installed in your default library search path.
148 
 
149 
     <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>
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Necessary to build libgcj, the GCJ runtime.
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152 
     <br><dt>libelf version 0.8.12 (or later)<dd>
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Necessary to build link-time optimization (LTO) support.  It can be
154 
downloaded from <a href="http://www.mr511.de/software/libelf-0.8.12.tar.gz">http://www.mr511.de/software/libelf-0.8.12.tar.gz</a>,
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though it is commonly available in several systems.  The versions in
156 
IRIX 5 and 6 don't work since they lack <samp><span class="file">gelf.h</span></samp>.  The version in
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Solaris 2 does work.
158 
 
159 
     <p>The <samp><span class="option">--with-libelf</span></samp> configure option should be used if libelf is
160 
not installed in your default library search patch.
161 
 
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</dl>
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164 
<h3 class="heading"><a name="TOC1"></a>Tools/packages necessary for modifying GCC</h3>
165 
 
166 
     <dl>
167 
<dt>autoconf version 2.64<dt>GNU m4 version 1.4.6 (or later)<dd>
168 
Necessary when modifying <samp><span class="file">configure.ac</span></samp>, <samp><span class="file">aclocal.m4</span></samp>, etc.
169 
to regenerate <samp><span class="file">configure</span></samp> and <samp><span class="file">config.in</span></samp> files.
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     <br><dt>automake version 1.11.1<dd>
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Necessary when modifying a <samp><span class="file">Makefile.am</span></samp> file to regenerate its
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associated <samp><span class="file">Makefile.in</span></samp>.
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     <p>Much of GCC does not use automake, so directly edit the <samp><span class="file">Makefile.in</span></samp>
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file.  Specifically this applies to the <samp><span class="file">gcc</span></samp>, <samp><span class="file">intl</span></samp>,
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<samp><span class="file">libcpp</span></samp>, <samp><span class="file">libiberty</span></samp>, <samp><span class="file">libobjc</span></samp> directories as well
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as any of their subdirectories.
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     <p>For directories that use automake, GCC requires the latest release in
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the 1.11 series, which is currently 1.11.1.  When regenerating a directory
182 
to a newer version, please update all the directories using an older 1.11
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to the latest released version.
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185 
     <br><dt>gettext version 0.14.5 (or later)<dd>
186 
Needed to regenerate <samp><span class="file">gcc.pot</span></samp>.
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     <br><dt>gperf version 2.7.2 (or later)<dd>
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Necessary when modifying <samp><span class="command">gperf</span></samp> input files, e.g.
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<samp><span class="file">gcc/cp/cfns.gperf</span></samp> to regenerate its associated header file, e.g.
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<samp><span class="file">gcc/cp/cfns.h</span></samp>.
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     <br><dt>DejaGnu 1.4.4<dt>Expect<dt>Tcl<dd>
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Necessary to run the GCC testsuite; see the section on testing for details.
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     <br><dt>autogen version 5.5.4 (or later) and<dt>guile version 1.4.1 (or later)<dd>
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Necessary to regenerate <samp><span class="file">fixinc/fixincl.x</span></samp> from
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<samp><span class="file">fixinc/inclhack.def</span></samp> and <samp><span class="file">fixinc/*.tpl</span></samp>.
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     <p>Necessary to run &lsquo;<samp><span class="samp">make check</span></samp>&rsquo; for <samp><span class="file">fixinc</span></samp>.
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     <p>Necessary to regenerate the top level <samp><span class="file">Makefile.in</span></samp> file from
203 
<samp><span class="file">Makefile.tpl</span></samp> and <samp><span class="file">Makefile.def</span></samp>.
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     <br><dt>Flex version 2.5.4 (or later)<dd>
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Necessary when modifying <samp><span class="file">*.l</span></samp> files.
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     <p>Necessary to build GCC during development because the generated output
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files are not included in the SVN repository.  They are included in
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releases.
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     <br><dt>Texinfo version 4.7 (or later)<dd>
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Necessary for running <samp><span class="command">makeinfo</span></samp> when modifying <samp><span class="file">*.texi</span></samp>
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files to test your changes.
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     <p>Necessary for running <samp><span class="command">make dvi</span></samp> or <samp><span class="command">make pdf</span></samp> to
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create printable documentation in DVI or PDF format.  Texinfo version
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4.8 or later is required for <samp><span class="command">make pdf</span></samp>.
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     <p>Necessary to build GCC documentation during development because the
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generated output files are not included in the SVN repository.  They are
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included in releases.
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     <br><dt>TeX (any working version)<dd>
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Necessary for running <samp><span class="command">texi2dvi</span></samp> and <samp><span class="command">texi2pdf</span></samp>, which
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are used when running <samp><span class="command">make dvi</span></samp> or <samp><span class="command">make pdf</span></samp> to create
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DVI or PDF files, respectively.
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     <br><dt>SVN (any version)<dt>SSH (any version)<dd>
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Necessary to access the SVN repository.  Public releases and weekly
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snapshots of the development sources are also available via FTP.
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     <br><dt>Perl version 5.6.1 (or later)<dd>
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Necessary when regenerating <samp><span class="file">Makefile</span></samp> dependencies in libiberty.
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Necessary when regenerating <samp><span class="file">libiberty/functions.texi</span></samp>.
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Necessary when generating manpages from Texinfo manuals.
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Necessary when targetting Darwin, building libstdc++,
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and not using <samp><span class="option">--disable-symvers</span></samp>.
239 
Used by various scripts to generate some files included in SVN (mainly
240 
Unicode-related and rarely changing) from source tables.
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     <br><dt>GNU diffutils version 2.7 (or later)<dd>
243 
Useful when submitting patches for the GCC source code.
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245 
     <br><dt>patch version 2.5.4 (or later)<dd>
246 
Necessary when applying patches, created with <samp><span class="command">diff</span></samp>, to one's
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own sources.
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     <br><dt>ecj1<dt>gjavah<dd>
250 
If you wish to modify <samp><span class="file">.java</span></samp> files in libjava, you will need to
251 
configure with <samp><span class="option">--enable-java-maintainer-mode</span></samp>, and you will need
252 
to have executables named <samp><span class="command">ecj1</span></samp> and <samp><span class="command">gjavah</span></samp> in your path.
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The <samp><span class="command">ecj1</span></samp> executable should run the Eclipse Java compiler via
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the GCC-specific entry point.  You can download a suitable jar from
255 
<a href="ftp://sourceware.org/pub/java/">ftp://sourceware.org/pub/java/</a>, or by running the script
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<samp><span class="command">contrib/download_ecj</span></samp>.
257 
 
258 
     <br><dt>antlr.jar version 2.7.1 (or later)<dt>antlr binary<dd>
259 
If you wish to build the <samp><span class="command">gjdoc</span></samp> binary in libjava, you will
260 
need to have an <samp><span class="file">antlr.jar</span></samp> library available. The library is
261 
searched in system locations but can be configured with
262 
<samp><span class="option">--with-antlr-jar=</span></samp> instead.  When configuring with
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<samp><span class="option">--enable-java-maintainer-mode</span></samp>, you will need to have one of
264 
the executables named <samp><span class="command">cantlr</span></samp>, <samp><span class="command">runantlr</span></samp> or
265 
<samp><span class="command">antlr</span></samp> in your path.
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</dl>
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   <p><hr />
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<p><a href="./index.html">Return to the GCC Installation page</a>
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