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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>
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<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.
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     <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
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GCC binary (version 2.95 or later) because source code for language
59 
frontends other than C might use GCC extensions.
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61 
     <br><dt>GNAT<dd>
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In order to build the Ada compiler (GNAT) you must already have GNAT
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installed because portions of the Ada frontend are written in Ada (with
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GNAT extensions.)  Refer to the Ada installation instructions for more
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specific information.
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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
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<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
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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.
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     <br><dt>A POSIX or SVR4 awk<dd>
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Necessary for creating some of the generated source files for GCC.
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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
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requirements.
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     <br><dt>gzip version 1.2.4 (or later) or<dt>bzip2 version 1.0.2 (or later)<dd>
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Necessary to uncompress GCC <samp><span class="command">tar</span></samp> files when source code is
96 
obtained via FTP mirror sites.
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98 
     <br><dt>GNU make version 3.80 (or later)<dd>
99 
You must have GNU make installed to build GCC.
100 
 
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     <br><dt>GNU tar version 1.14 (or later)<dd>
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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
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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
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distribution is found in a subdirectory of your GCC sources named
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<samp><span class="file">gmp</span></samp>, it will be built together with GCC.
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114 
     <br><dt>MPFR Library version 2.4.2 (or later)<dd>
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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
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<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
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<samp><span class="file">mpfr</span></samp>, it will be built together with GCC.
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     <br><dt>MPC Library version 0.8.1 (or later)<dd>
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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
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in your default library search path.  See also <samp><span class="option">--with-mpc-lib</span></samp>
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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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     <br><dt>Parma Polyhedra Library (PPL) version 0.10<dd>
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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>.
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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.
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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>.
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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.
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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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     <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
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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
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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 
 
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     <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.
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</dl>
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<h3 class="heading"><a name="TOC1"></a>Tools/packages necessary for modifying GCC</h3>
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     <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.
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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
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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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     <br><dt>gettext version 0.14.5 (or later)<dd>
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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
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<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
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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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     <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>
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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
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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
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<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 
 
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     <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
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searched in system locations but can be configured with
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<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
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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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