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     15  1.11  mrg A GNU Manual
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     25  1.13  mrg <title>Prerequisites for GCC</title>
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     61   1.1  mrg </head>
     62  1.11  mrg 
     63  1.11  mrg <body lang="en">
     64  1.13  mrg <h1 class="settitle" align="center">Prerequisites for GCC</h1>
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     80  1.11  mrg 
     81  1.11  mrg 
     82  1.14  mrg <a name="index-Prerequisites"></a>
     83  1.11  mrg 
     84  1.11  mrg <p>GCC requires that various tools and packages be available for use in the
     85  1.10  mrg build procedure.  Modifying GCC sources requires additional tools
     86  1.10  mrg described below.
     87  1.11  mrg </p>
     88  1.14  mrg <a name="Tools_002fpackages-necessary-for-building-GCC"></a>
     89  1.14  mrg <h3 class="heading">Tools/packages necessary for building GCC</h3>
     90  1.11  mrg <dl compact="compact">
     91  1.15  mrg <dt>ISO C++11 compiler</dt>
     92  1.15  mrg <dd><p>Necessary to bootstrap GCC.  GCC 4.8.3 or newer has sufficient
     93  1.15  mrg support for used C++11 features, with earlier GCC versions you
     94  1.15  mrg might run into implementation bugs.
     95  1.15  mrg </p>
     96  1.15  mrg <p>Versions of GCC prior to 11 also allow bootstrapping with an ISO C++98
     97  1.15  mrg compiler, versions of GCC prior to 4.8 also allow bootstrapping with a
     98  1.15  mrg ISO C89 compiler, and versions of GCC prior to 3.4 also allow
     99  1.15  mrg bootstrapping with a traditional (K&amp;R) C compiler.
    100  1.11  mrg </p>
    101  1.11  mrg <p>To build all languages in a cross-compiler or other configuration where
    102   1.1  mrg 3-stage bootstrap is not performed, you need to start with an existing
    103  1.15  mrg GCC binary (version 4.8.3 or later) because source code for language
    104   1.1  mrg frontends other than C might use GCC extensions.
    105  1.11  mrg </p>
    106  1.11  mrg </dd>
    107  1.14  mrg <dt>C standard library and headers</dt>
    108  1.11  mrg <dd>
    109  1.11  mrg <p>In order to build GCC, the C standard library and headers must be present
    110   1.5  mrg for all target variants for which target libraries will be built (and not
    111   1.5  mrg only the variant of the host C++ compiler).
    112  1.11  mrg </p>
    113  1.12  mrg <p>This affects the popular &lsquo;<samp>x86_64-pc-linux-gnu</samp>&rsquo; platform (among
    114  1.11  mrg other multilib targets), for which 64-bit (&lsquo;<samp>x86_64</samp>&rsquo;) and 32-bit
    115  1.11  mrg (&lsquo;<samp>i386</samp>&rsquo;) libc headers are usually packaged separately. If you do a
    116  1.12  mrg build of a native compiler on &lsquo;<samp>x86_64-pc-linux-gnu</samp>&rsquo;, make sure you
    117   1.5  mrg either have the 32-bit libc developer package properly installed (the exact
    118   1.5  mrg name of the package depends on your distro) or you must build GCC as a
    119   1.5  mrg 64-bit only compiler by configuring with the option
    120  1.11  mrg <samp>--disable-multilib</samp>.  Otherwise, you may encounter an error such as
    121  1.11  mrg &lsquo;<samp>fatal error: gnu/stubs-32.h: No such file</samp>&rsquo;
    122  1.11  mrg </p>
    123  1.11  mrg </dd>
    124  1.14  mrg <dt><a name="GNAT-prerequisite"></a>GNAT</dt>
    125  1.11  mrg <dd>
    126  1.13  mrg <p>In order to build GNAT, the Ada compiler, you need a working GNAT
    127  1.15  mrg compiler (GCC version 5.1 or later).
    128  1.13  mrg </p>
    129  1.13  mrg <p>This includes GNAT tools such as <code>gnatmake</code> and
    130  1.13  mrg <code>gnatlink</code>, since the Ada front end is written in Ada and
    131  1.13  mrg uses some GNAT-specific extensions.
    132  1.13  mrg </p>
    133  1.13  mrg <p>In order to build a cross compiler, it is strongly recommended to install
    134  1.13  mrg the new compiler as native first, and then use it to build the cross
    135  1.13  mrg compiler. Other native compiler versions may work but this is not guaranteed and
    136  1.13  mrg will typically fail with hard to understand compilation errors during the
    137  1.13  mrg build.
    138  1.13  mrg </p>
    139  1.13  mrg <p>Similarly, it is strongly recommended to use an older version of GNAT to build
    140  1.13  mrg GNAT. More recent versions of GNAT than the version built are not guaranteed
    141  1.13  mrg to work and will often fail during the build with compilation errors.
    142  1.13  mrg </p>
    143  1.13  mrg <p>Note that <code>configure</code> does not test whether the GNAT installation works
    144  1.13  mrg and has a sufficiently recent version; if too old a GNAT version is
    145  1.13  mrg installed and <samp>--enable-languages=ada</samp> is used, the build will fail.
    146  1.13  mrg </p>
    147  1.13  mrg <p><code>ADA_INCLUDE_PATH</code> and <code>ADA_OBJECT_PATH</code> environment variables
    148  1.13  mrg must not be set when building the Ada compiler, the Ada tools, or the
    149  1.13  mrg Ada runtime libraries. You can check that your build environment is clean
    150  1.13  mrg by verifying that &lsquo;<samp>gnatls -v</samp>&rsquo; lists only one explicit path in each
    151  1.13  mrg section.
    152  1.11  mrg </p>
    153  1.11  mrg </dd>
    154  1.15  mrg <dt><a name="GDC-prerequisite"></a>GDC</dt>
    155  1.15  mrg <dd>
    156  1.15  mrg <p>In order to build GDC, the D compiler, you need a working GDC
    157  1.15  mrg compiler (GCC version 9.4 or later) and D runtime library,
    158  1.15  mrg &lsquo;<samp>libphobos</samp>&rsquo;, as the D front end is written in D.
    159  1.15  mrg </p>
    160  1.15  mrg <p>Versions of GDC prior to 12 can be built with an ISO C++11 compiler, which can
    161  1.15  mrg then be installed and used to bootstrap newer versions of the D front end.
    162  1.15  mrg </p>
    163  1.15  mrg <p>It is strongly recommended to use an older version of GDC to build GDC. More
    164  1.15  mrg recent versions of GDC than the version built are not guaranteed to work and
    165  1.15  mrg will often fail during the build with compilation errors relating to
    166  1.15  mrg deprecations or removed features.
    167  1.15  mrg </p>
    168  1.15  mrg <p>Note that <code>configure</code> does not test whether the GDC installation works
    169  1.15  mrg and has a sufficiently recent version.  Though the implementation of the D
    170  1.15  mrg front end does not make use of any GDC-specific extensions, or novel features
    171  1.15  mrg of the D language, if too old a GDC version is installed and
    172  1.15  mrg <samp>--enable-languages=d</samp> is used, the build will fail.
    173  1.15  mrg </p>
    174  1.15  mrg <p>On some targets, &lsquo;<samp>libphobos</samp>&rsquo; isn&rsquo;t enabled by default, but compiles
    175  1.15  mrg and works if <samp>--enable-libphobos</samp> is used.  Specifics are
    176  1.15  mrg documented for affected targets.
    177  1.15  mrg </p>
    178  1.15  mrg </dd>
    179  1.14  mrg <dt>A &ldquo;working&rdquo; POSIX compatible shell, or GNU bash</dt>
    180  1.11  mrg <dd>
    181  1.11  mrg <p>Necessary when running <code>configure</code> because some
    182  1.11  mrg <code>/bin/sh</code> shells have bugs and may crash when configuring the
    183  1.11  mrg target libraries.  In other cases, <code>/bin/sh</code> or <code>ksh</code>
    184   1.1  mrg have disastrous corner-case performance problems.  This
    185  1.11  mrg can cause target <code>configure</code> runs to literally take days to
    186   1.1  mrg complete in some cases.
    187  1.11  mrg </p>
    188  1.11  mrg <p>So on some platforms <code>/bin/ksh</code> is sufficient, on others it
    189  1.11  mrg isn&rsquo;t.  See the host/target specific instructions for your platform, or
    190  1.11  mrg use <code>bash</code> to be sure.  Then set <code>CONFIG_SHELL</code> in your
    191   1.1  mrg environment to your &ldquo;good&rdquo; shell prior to running
    192  1.11  mrg <code>configure</code>/<code>make</code>.
    193  1.11  mrg </p>
    194  1.11  mrg <p><code>zsh</code> is not a fully compliant POSIX shell and will not
    195   1.1  mrg work when configuring GCC.
    196  1.11  mrg </p>
    197  1.11  mrg </dd>
    198  1.14  mrg <dt>A POSIX or SVR4 awk</dt>
    199  1.11  mrg <dd>
    200  1.11  mrg <p>Necessary for creating some of the generated source files for GCC.
    201   1.1  mrg If in doubt, use a recent GNU awk version, as some of the older ones
    202   1.1  mrg are broken.  GNU awk version 3.1.5 is known to work.
    203  1.11  mrg </p>
    204  1.11  mrg </dd>
    205  1.14  mrg <dt>GNU binutils</dt>
    206  1.11  mrg <dd>
    207  1.11  mrg <p>Necessary in some circumstances, optional in others.  See the
    208   1.1  mrg host/target specific instructions for your platform for the exact
    209   1.1  mrg requirements.
    210  1.11  mrg </p>
    211  1.15  mrg <p>Note binutils 2.35 or newer is required for LTO to work correctly
    212  1.15  mrg with GNU libtool that includes doing a bootstrap with LTO enabled.
    213  1.15  mrg </p>
    214  1.11  mrg </dd>
    215  1.14  mrg <dt>gzip version 1.2.4 (or later) or</dt>
    216  1.14  mrg <dt>bzip2 version 1.0.2 (or later)</dt>
    217  1.11  mrg <dd>
    218  1.11  mrg <p>Necessary to uncompress GCC <code>tar</code> files when source code is
    219  1.13  mrg obtained via HTTPS mirror sites.
    220  1.11  mrg </p>
    221  1.11  mrg </dd>
    222  1.14  mrg <dt>GNU make version 3.80 (or later)</dt>
    223  1.11  mrg <dd>
    224  1.11  mrg <p>You must have GNU make installed to build GCC.
    225  1.11  mrg </p>
    226  1.11  mrg </dd>
    227  1.14  mrg <dt>GNU tar version 1.14 (or later)</dt>
    228  1.11  mrg <dd>
    229  1.11  mrg <p>Necessary (only on some platforms) to untar the source code.  Many
    230  1.11  mrg systems&rsquo; <code>tar</code> programs will also work, only try GNU
    231  1.11  mrg <code>tar</code> if you have problems.
    232  1.11  mrg </p>
    233  1.11  mrg </dd>
    234  1.14  mrg <dt>Perl version between 5.6.1 and 5.6.24</dt>
    235  1.11  mrg <dd>
    236  1.11  mrg <p>Necessary when targeting Darwin, building &lsquo;<samp>libstdc++</samp>&rsquo;,
    237  1.11  mrg and not using <samp>--disable-symvers</samp>.
    238  1.13  mrg Necessary when targeting Solaris 2 with Solaris <code>ld</code> and not using
    239  1.13  mrg <samp>--disable-symvers</samp>.
    240  1.11  mrg </p>
    241  1.11  mrg <p>Necessary when regenerating <samp>Makefile</samp> dependencies in libiberty.
    242  1.11  mrg Necessary when regenerating <samp>libiberty/functions.texi</samp>.
    243  1.11  mrg Necessary when generating manpages from Texinfo manuals.
    244  1.11  mrg Used by various scripts to generate some files included in the source
    245  1.11  mrg repository (mainly Unicode-related and rarely changing) from source
    246  1.11  mrg tables.
    247  1.11  mrg </p>
    248  1.11  mrg <p>Used by <code>automake</code>.
    249  1.11  mrg </p>
    250  1.15  mrg <p>If available, enables parallel testing of &lsquo;<samp>libgomp</samp>&rsquo; in case that
    251  1.15  mrg <code>flock</code> is not available.
    252  1.15  mrg </p>
    253  1.11  mrg </dd>
    254   1.3  mrg </dl>
    255   1.3  mrg 
    256  1.11  mrg <p>Several support libraries are necessary to build GCC, some are required,
    257   1.3  mrg others optional.  While any sufficiently new version of required tools
    258   1.3  mrg usually work, library requirements are generally stricter.  Newer
    259  1.11  mrg versions may work in some cases, but it&rsquo;s safer to use the exact
    260   1.3  mrg versions documented.  We appreciate bug reports about problems with
    261   1.3  mrg newer versions, though.  If your OS vendor provides packages for the
    262   1.3  mrg support libraries then using those packages may be the simplest way to
    263   1.3  mrg install the libraries.
    264  1.11  mrg </p>
    265  1.11  mrg <dl compact="compact">
    266  1.14  mrg <dt>GNU Multiple Precision Library (GMP) version 4.3.2 (or later)</dt>
    267  1.11  mrg <dd>
    268  1.11  mrg <p>Necessary to build GCC.  If a GMP source distribution is found in a
    269  1.11  mrg subdirectory of your GCC sources named <samp>gmp</samp>, it will be built
    270   1.3  mrg together with GCC.  Alternatively, if GMP is already installed but it
    271   1.3  mrg is not in your library search path, you will have to configure with the
    272  1.11  mrg <samp>--with-gmp</samp> configure option.  See also <samp>--with-gmp-lib</samp>
    273  1.11  mrg and <samp>--with-gmp-include</samp>.
    274  1.10  mrg The in-tree build is only supported with the GMP version that
    275  1.10  mrg download_prerequisites installs.
    276  1.11  mrg </p>
    277  1.11  mrg </dd>
    278  1.14  mrg <dt>MPFR Library version 3.1.0 (or later)</dt>
    279  1.11  mrg <dd>
    280  1.11  mrg <p>Necessary to build GCC.  It can be downloaded from
    281  1.12  mrg <a href="https://www.mpfr.org">https://www.mpfr.org</a>.  If an MPFR source distribution is found
    282  1.11  mrg in a subdirectory of your GCC sources named <samp>mpfr</samp>, it will be
    283   1.3  mrg built together with GCC.  Alternatively, if MPFR is already installed
    284   1.3  mrg but it is not in your default library search path, the
    285  1.11  mrg <samp>--with-mpfr</samp> configure option should be used.  See also
    286  1.11  mrg <samp>--with-mpfr-lib</samp> and <samp>--with-mpfr-include</samp>.
    287  1.10  mrg The in-tree build is only supported with the MPFR version that
    288  1.10  mrg download_prerequisites installs.
    289  1.11  mrg </p>
    290  1.11  mrg </dd>
    291  1.14  mrg <dt>MPC Library version 1.0.1 (or later)</dt>
    292  1.11  mrg <dd>
    293  1.11  mrg <p>Necessary to build GCC.  It can be downloaded from
    294  1.15  mrg <a href="https://www.multiprecision.org/mpc/">https://www.multiprecision.org/mpc/</a>.  If an MPC source distribution
    295  1.11  mrg is found in a subdirectory of your GCC sources named <samp>mpc</samp>, it
    296   1.3  mrg will be built together with GCC.  Alternatively, if MPC is already
    297   1.3  mrg installed but it is not in your default library search path, the
    298  1.11  mrg <samp>--with-mpc</samp> configure option should be used.  See also
    299  1.11  mrg <samp>--with-mpc-lib</samp> and <samp>--with-mpc-include</samp>.
    300  1.10  mrg The in-tree build is only supported with the MPC version that
    301  1.10  mrg download_prerequisites installs.
    302  1.11  mrg </p>
    303  1.11  mrg </dd>
    304  1.14  mrg <dt>isl Library version 0.15 or later.</dt>
    305  1.11  mrg <dd>
    306  1.11  mrg <p>Necessary to build GCC with the Graphite loop optimizations.
    307  1.13  mrg It can be downloaded from <a href="https://gcc.gnu.org/pub/gcc/infrastructure/">https://gcc.gnu.org/pub/gcc/infrastructure/</a>.
    308   1.7  mrg If an isl source distribution is found
    309  1.11  mrg in a subdirectory of your GCC sources named <samp>isl</samp>, it will be
    310  1.11  mrg built together with GCC.  Alternatively, the <samp>--with-isl</samp> configure
    311   1.7  mrg option should be used if isl is not installed in your default library
    312   1.5  mrg search path.
    313  1.11  mrg </p>
    314  1.11  mrg </dd>
    315  1.14  mrg <dt>zstd Library.</dt>
    316  1.13  mrg <dd>
    317  1.13  mrg <p>Necessary to build GCC with zstd compression used for LTO bytecode.
    318  1.13  mrg The library is searched in your default library patch search.
    319  1.13  mrg Alternatively, the <samp>--with-zstd</samp> configure option should be used.
    320  1.13  mrg </p>
    321  1.13  mrg </dd>
    322  1.11  mrg </dl>
    323   1.1  mrg 
    324  1.14  mrg <a name="Tools_002fpackages-necessary-for-modifying-GCC"></a>
    325  1.14  mrg <h3 class="heading">Tools/packages necessary for modifying GCC</h3>
    326  1.11  mrg <dl compact="compact">
    327  1.14  mrg <dt>autoconf version 2.69</dt>
    328  1.14  mrg <dt>GNU m4 version 1.4.6 (or later)</dt>
    329  1.11  mrg <dd>
    330  1.11  mrg <p>Necessary when modifying <samp>configure.ac</samp>, <samp>aclocal.m4</samp>, etc.
    331  1.11  mrg to regenerate <samp>configure</samp> and <samp>config.in</samp> files.
    332  1.11  mrg </p>
    333  1.11  mrg </dd>
    334  1.14  mrg <dt>automake version 1.15.1</dt>
    335  1.11  mrg <dd>
    336  1.11  mrg <p>Necessary when modifying a <samp>Makefile.am</samp> file to regenerate its
    337  1.11  mrg associated <samp>Makefile.in</samp>.
    338  1.11  mrg </p>
    339  1.11  mrg <p>Much of GCC does not use automake, so directly edit the <samp>Makefile.in</samp>
    340  1.11  mrg file.  Specifically this applies to the <samp>gcc</samp>, <samp>intl</samp>,
    341  1.11  mrg <samp>libcpp</samp>, <samp>libiberty</samp>, <samp>libobjc</samp> directories as well
    342   1.1  mrg as any of their subdirectories.
    343  1.11  mrg </p>
    344  1.11  mrg <p>For directories that use automake, GCC requires the latest release in
    345  1.12  mrg the 1.15 series, which is currently 1.15.1.  When regenerating a directory
    346  1.12  mrg to a newer version, please update all the directories using an older 1.15
    347   1.1  mrg to the latest released version.
    348  1.11  mrg </p>
    349  1.11  mrg </dd>
    350  1.14  mrg <dt>gettext version 0.14.5 (or later)</dt>
    351  1.11  mrg <dd>
    352  1.11  mrg <p>Needed to regenerate <samp>gcc.pot</samp>.
    353  1.11  mrg </p>
    354  1.11  mrg </dd>
    355  1.14  mrg <dt>gperf version 2.7.2 (or later)</dt>
    356  1.11  mrg <dd>
    357  1.11  mrg <p>Necessary when modifying <code>gperf</code> input files, e.g.
    358  1.11  mrg <samp>gcc/cp/cfns.gperf</samp> to regenerate its associated header file, e.g.
    359  1.11  mrg <samp>gcc/cp/cfns.h</samp>.
    360  1.11  mrg </p>
    361  1.11  mrg </dd>
    362  1.15  mrg <dt>DejaGnu version 1.5.3 (or later)</dt>
    363  1.14  mrg <dt>Expect</dt>
    364  1.14  mrg <dt>Tcl</dt>
    365  1.11  mrg <dd>
    366  1.11  mrg <p>Necessary to run the GCC testsuite; see the section on testing for
    367  1.13  mrg details.
    368  1.11  mrg </p>
    369  1.11  mrg </dd>
    370  1.14  mrg <dt>autogen version 5.5.4 (or later) and</dt>
    371  1.14  mrg <dt>guile version 1.4.1 (or later)</dt>
    372  1.11  mrg <dd>
    373  1.11  mrg <p>Necessary to regenerate <samp>fixinc/fixincl.x</samp> from
    374  1.11  mrg <samp>fixinc/inclhack.def</samp> and <samp>fixinc/*.tpl</samp>.
    375  1.11  mrg </p>
    376  1.11  mrg <p>Necessary to run &lsquo;<samp>make check</samp>&rsquo; for <samp>fixinc</samp>.
    377  1.11  mrg </p>
    378  1.11  mrg <p>Necessary to regenerate the top level <samp>Makefile.in</samp> file from
    379  1.11  mrg <samp>Makefile.tpl</samp> and <samp>Makefile.def</samp>.
    380  1.11  mrg </p>
    381  1.11  mrg </dd>
    382  1.14  mrg <dt>Flex version 2.5.4 (or later)</dt>
    383  1.11  mrg <dd>
    384  1.11  mrg <p>Necessary when modifying <samp>*.l</samp> files.
    385  1.11  mrg </p>
    386  1.11  mrg <p>Necessary to build GCC during development because the generated output
    387  1.11  mrg files are not included in the version-controlled source repository.
    388  1.11  mrg They are included in releases.
    389  1.11  mrg </p>
    390  1.11  mrg </dd>
    391  1.14  mrg <dt>Texinfo version 4.7 (or later)</dt>
    392  1.11  mrg <dd>
    393  1.11  mrg <p>Necessary for running <code>makeinfo</code> when modifying <samp>*.texi</samp>
    394  1.11  mrg files to test your changes.
    395  1.11  mrg </p>
    396  1.11  mrg <p>Necessary for running <code>make dvi</code> or <code>make pdf</code> to
    397  1.11  mrg create printable documentation in DVI or PDF format.  Texinfo version
    398  1.11  mrg 4.8 or later is required for <code>make pdf</code>.
    399  1.11  mrg </p>
    400  1.11  mrg <p>Necessary to build GCC documentation during development because the
    401  1.11  mrg generated output files are not included in the repository.  They are
    402  1.11  mrg included in releases.
    403  1.11  mrg </p>
    404  1.11  mrg </dd>
    405  1.14  mrg <dt>TeX (any working version)</dt>
    406  1.11  mrg <dd>
    407  1.11  mrg <p>Necessary for running <code>texi2dvi</code> and <code>texi2pdf</code>, which
    408  1.11  mrg are used when running <code>make dvi</code> or <code>make pdf</code> to create
    409  1.11  mrg DVI or PDF files, respectively.
    410  1.11  mrg </p>
    411  1.11  mrg </dd>
    412  1.14  mrg <dt>Sphinx version 1.0 (or later)</dt>
    413  1.11  mrg <dd>
    414  1.11  mrg <p>Necessary to regenerate <samp>jit/docs/_build/texinfo</samp> from the <samp>.rst</samp>
    415  1.11  mrg files in the directories below <samp>jit/docs</samp>.
    416  1.11  mrg </p>
    417  1.11  mrg </dd>
    418  1.14  mrg <dt>git (any version)</dt>
    419  1.14  mrg <dt>SSH (any version)</dt>
    420  1.11  mrg <dd>
    421  1.11  mrg <p>Necessary to access the source repository.  Public releases and weekly
    422  1.11  mrg snapshots of the development sources are also available via HTTPS.
    423  1.11  mrg </p>
    424  1.11  mrg </dd>
    425  1.14  mrg <dt>GNU diffutils version 2.7 (or later)</dt>
    426  1.11  mrg <dd>
    427  1.11  mrg <p>Useful when submitting patches for the GCC source code.
    428  1.11  mrg </p>
    429  1.11  mrg </dd>
    430  1.14  mrg <dt>patch version 2.5.4 (or later)</dt>
    431  1.11  mrg <dd>
    432  1.11  mrg <p>Necessary when applying patches, created with <code>diff</code>, to one&rsquo;s
    433  1.11  mrg own sources.
    434  1.11  mrg </p>
    435  1.11  mrg </dd>
    436  1.11  mrg </dl>
    437  1.10  mrg 
    438  1.11  mrg <hr />
    439  1.11  mrg <p>
    440  1.11  mrg <p><a href="./index.html">Return to the GCC Installation page</a>
    441  1.11  mrg </p>
    442  1.10  mrg 
    443  1.10  mrg 
    444  1.10  mrg 
    445  1.10  mrg 
    446  1.10  mrg 
    447  1.10  mrg 
    448   1.7  mrg 
    449   1.7  mrg 
    450   1.7  mrg 
    451   1.7  mrg 
    452   1.6  mrg 
    453   1.1  mrg 
    454  1.11  mrg </body>
    455  1.11  mrg </html>
    456