source: clfs-embedded/BOOK/cross-tools/common/gcc-static.xml @ 5058de7

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<sect1 id="ch-cross-tools-gcc-static" role="wrap">
  <?dbhtml filename="gcc-static.html"?>

  <title>Cross GCC-&gcc-version; - Static</title>

  <indexterm zone="ch-cross-tools-gcc-static">
    <primary sortas="a-GCC">GCC</primary>
    <secondary>cross tools, static</secondary>
  </indexterm>

  <sect2 role="package">
    <title/>

    <para>The GCC package contains the GNU compiler collection, which includes
    the C and C++ compilers.</para>

  </sect2>

  <sect2 role="installation">
    <title>Installation of Cross GCC Compiler with Static libgcc
    and no Threads</title>

    <para os="c">The GCC documentation recommends building GCC outside of the source
    directory in a dedicated build directory:</para>

<screen os="d"><userinput>mkdir -v ../gcc-build
cd ../gcc-build</userinput></screen>

    <para os="e">Prepare GCC for compilation:</para>

<screen os="ae"><userinput>AR=ar LDFLAGS="-Wl,-rpath,${CLFS}/cross-tools/lib" \
  ../gcc-&gcc-version;/configure --prefix=${CLFS}/cross-tools \
  --build=${CLFS_HOST} --host=${CLFS_HOST} --target=${CLFS_TARGET} \
  --with-sysroot=${CLFS} --disable-nls  --disable-shared \
  --with-mpfr=${CLFS}/cross-tools --with-gmp=${CLFS}/cross-tools \
  --without-headers --with-newlib --disable-decimal-float \
  --disable-libgomp --disable-libmudflap --disable-libssp \
  --disable-threads --enable-languages=c</userinput></screen>

    <variablelist os="af">
      <title>The meaning of the configure options:</title>

      <varlistentry os="af1">
        <term><parameter>--prefix=${CLFS}/cross-tools</parameter></term>
        <listitem>
          <para>This tells the configure script to prepare to install the
          package in the <filename class="directory">${CLFS}/cross-tools</filename>
          directory.</para>
        </listitem>
      </varlistentry>

      <varlistentry os="af2">
        <term><parameter>--build=${CLFS_HOST}</parameter></term>
        <listitem>
          <para>This tells the configure script the triplet to use to build GCC.
          It will use ${CLFS_HOST} as that's where it's being built.</para>
        </listitem>
      </varlistentry>

      <varlistentry os="af3">
        <term><parameter>--host=${CLFS_HOST}</parameter></term>
        <listitem>
          <para>This tells the configure script the triplet of the machine GCC 
          will be executed on when actually cross compiling.  It will use 
          ${CLFS_HOST} as that's where GCC will execute when cross compiling
          software later.</para>
        </listitem>
      </varlistentry>

      <varlistentry os="af4">
        <term><parameter>--target=${CLFS_TARGET}</parameter></term>
        <listitem>
          <para>This tells the configure script the triplet of the machine GCC
          will build executables for.  It will use ${CLFS_TARGET} so that software
          compiled with this version of GCC can be executed on the embedded machine
          target.</para>
        </listitem>
      </varlistentry>

      <varlistentry os="af5">
        <term><parameter>--with-sysroot=${CLFS}</parameter></term>
        <listitem>
          <para>This tells configure that ${CLFS} is going to be the root
          of our system. It will now use the specified sysroot, ${CLFS}, as
          a prefix of the default search paths.</para>
        </listitem>
      </varlistentry>

      <varlistentry os="af6">
        <term><parameter>--disable-nls</parameter></term>
        <listitem>
          <para>This disables internationalization as i18n is not needed for the
          cross-compile tools.</para>
        </listitem>
      </varlistentry>

      <varlistentry os="af7">
        <term><parameter>--disable-shared</parameter></term>
        <listitem>
          <para>Disables the creation of the shared libraries.</para>
        </listitem>
      </varlistentry>

      <varlistentry os="af8">
        <term><parameter>--with-mpfr=${CLFS}/cross-tools</parameter></term>
        <listitem>
          <para>Tells configure where to find the 
          <filename class="directory">lib</filename> and 
          <filename class="directory">include</filename> directories
          that contain MPFR which was built earlier.</para>
        </listitem>
      </varlistentry>

      <varlistentry os="af9">
        <term><parameter>--with-gmp=${CLFS}/cross-tools</parameter></term>
        <listitem>
          <para>Tells configure where to find the 
          <filename class="directory">lib</filename> and 
          <filename class="directory">include</filename> directories
          that contain GMP which was built earlier.</para>
        </listitem>
      </varlistentry>

      <varlistentry os="af11">
        <term><parameter>--without-headers</parameter></term>
        <listitem>
          <para>Tells configure to not use any headers from any C libraries.
          This is needed as we haven't yet built the C library and to prevent
          influence from the host environment.</para>
        </listitem>
      </varlistentry>

      <varlistentry os="af12">
        <term><parameter>--with-newlib</parameter></term>
        <listitem>
          <para>Tells configure to build libgcc without needing any C
          libraries.</para>
        </listitem>
      </varlistentry>

      <varlistentry os="af13">
        <term><parameter>--disable-decimal-float</parameter></term>
        <listitem>
          <para>Tells configure to disable IEEE 754-2008 decimal floating
          point support.  Decimal floating point support isn't needed yet.</para>
        </listitem>
      </varlistentry>

      <varlistentry os="af14">
        <term><parameter>--disable-libgomp</parameter></term>
        <listitem>
          <para>Tells configure to not build the GOMP run-time libraries.
          GOMP is the GNU implementation of OpenMP, a API for shared-memory
          parallel programming.</para>
        </listitem>
      </varlistentry>

      <varlistentry os="af15">
        <term><parameter>--disable-libmudflap</parameter></term>
        <listitem>
          <para>Tells configure to not build libmudflap.  Mudflap is a 
          library that can be used to help check for proper pointer usage.</para>
        </listitem>
      </varlistentry>

      <varlistentry os="af16">
        <term><parameter>--disable-libssp</parameter></term>
        <listitem>
          <para>Tells configure not to build run-time libraries for stack
          smashing detection.</para>
        </listitem>
      </varlistentry>

      <varlistentry os="af17">
        <term><parameter>--disable-threads</parameter></term>
        <listitem>
          <para>This will prevent GCC from looking for the multi-thread
          include files, since they haven't been created for this architecture
          yet. GCC will be able to find the multi-thread information after
          the glib headers are created.</para>
        </listitem>
      </varlistentry>

      <varlistentry os="af18">
        <term><parameter>--enable-languages=c</parameter></term>
        <listitem>
          <para>This option ensures that only the C compiler is built.</para>
        </listitem>
      </varlistentry>

    </variablelist>

    <para os="ag">Continue with compiling the package:</para>

<screen os="ah"><userinput>make all-gcc all-target-libgcc</userinput></screen>

    <para os="ai">Install the package:</para>

<screen os="aj"><userinput>make install-gcc install-target-libgcc</userinput></screen>

  </sect2>

  <sect2 role="content">
    <title/>

    <para>Details on this package are located in <xref
    linkend="contents-gcc" role="."/></para>

  </sect2>

</sect1>