source: general/prog/gcc-ada.xml@ 57105fd

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
   "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../../general.ent">
  %general-entities;

  <!ENTITY gcc-download-http     "http://ftp.gnu.org/gnu/gcc/gcc-&gcc-version;/gcc-&gcc-version;.tar.bz2">
  <!ENTITY gcc-download-ftp      "ftp://ftp.gnu.org/gnu/gcc/gcc-&gcc-version;/gcc-&gcc-version;.tar.bz2">
  <!ENTITY gcc-md5sum            "fddf71348546af523353bd43d34919c1">
  <!ENTITY gcc-size              "86 MB">
  <!ENTITY gcc-ada-buildsize     "4.8 GB (0.7 GB added if GNAT install dir is not removed)">
  <!ENTITY gcc-ada-time          "133 SBU">

  <!ENTITY gnat-download-http    "https://libre.adacore.com/download/">
  <!ENTITY gnat-64-download-http "http://mirrors.cdn.adacore.com/art/7427735035ecc98968ebfcee17494161b0de28ef">
  <!ENTITY gnat-64-md5sum        "c0863ed75109b5aa737becfd5a6ec038">
  <!ENTITY gnat-64-size          "225 MB">
  <!ENTITY gnat-32-download-http "http://mirrors.cdn.adacore.com/art/3fc05fc61cbc7ab4f291ed19ea4cb269fffd17bd">
  <!ENTITY gnat-32-md5sum        "69423c7ad8d9759377d4fff71a78992d">
  <!ENTITY gnat-32-size          "222 MB">
]>

<sect1 id="gcc-ada" xreflabel="GCC-Ada-&gcc-version;">
  <?dbhtml filename="gcc-ada.html" ?>

  <sect1info>
    <othername>$LastChangedBy$</othername>
    <date>$Date$</date>
  </sect1info>

  <title>GCC-Ada-&gcc-version;</title>

  <indexterm zone="gcc-ada">
    <primary sortas="a-gcc-4-0">GCC-Ada&gcc-version;</primary>
  </indexterm>

  <sect2 role="package">
    <title>Introduction to the GCC Ada compiler</title>

    <para>Ada is a modern programming language designed for large, long-lived
    applications &mdash; and embedded systems in particular &mdash; where
    reliability and efficiency are essential. It has a set of unique technical
    features that make it highly effective for use in large, complex and
    safety-critical projects.</para>

    <para>The compiler and associated tools on this page are known as the
    <application>GNAT</application> technology, developed by the Adacore
    company, using the <application>GCC</application> backend. Since
    parts of the Ada compiler are written in Ada, there is a circular
    dependency on an Ada compiler. The instructions below first install
    a binary compiler.</para>

    &lfs76_checked;

    <caution>
      <para>Using the instructions on this page will have the effect that
      the C and C++ compiler and libraries will be reinstalled, overwriting
      the ones on your system. This may lead to some issues. Please read the
      notes and caution on the <xref linkend="gcc"/> page.</para>
    </caution>

    <bridgehead renderas="sect3">Package Information</bridgehead>
    <itemizedlist spacing="compact">
      <listitem>
        <para>Download (HTTP): <ulink url="&gcc-download-http;"/></para>
      </listitem>
      <listitem>
        <para>Download (FTP): <ulink url="&gcc-download-ftp;"/></para>
      </listitem>
      <listitem>
        <para>Download MD5 sum: &gcc-md5sum;</para>
      </listitem>
      <listitem>
        <para>Download size: &gcc-size;</para>
      </listitem>
      <listitem>
        <para>Estimated disk space required: &gcc-ada-buildsize;</para>
      </listitem>
      <listitem>
        <para>Estimated build time: &gcc-ada-time;</para>
      </listitem>
    </itemizedlist>

    <bridgehead renderas="sect3">Additional Downloads</bridgehead>
    <note>
      <para>You will need to install <application>GNAT</application>
      temporarily to satisfy the circular dependency. You may point your
      browser to the <ulink url="&gnat-download-http;">AdaCore download
      page</ulink>, choose your platform and 2014, then select the file
      to download. Alternatively, direct links to the 64 bit and 32 bit
      linux versions are given below.</para>
    </note>

    <itemizedlist spacing="compact">
      <listitem>
        <para>
          GNAT 64 bit binary: <ulink url="&gnat-64-download-http;"/>
        </para>
      </listitem>
      <listitem>
        <para>
          GNAT 64 bit MD5 sum: &gnat-64-md5sum;
        </para>
      </listitem>
      <listitem>
        <para>
          GNAT 64 bit size: &gnat-64-size;
        </para>
      </listitem>
      <listitem>
        <para>
          GNAT 32 bit binary: <ulink url="&gnat-32-download-http;"/>
        </para>
      </listitem>
      <listitem>
        <para>
          GNAT 32 bit MD5 sum: &gnat-32-md5sum;
        </para>
      </listitem>
      <listitem>
        <para>
          GNAT 32 bit size: &gnat-32-size;
        </para>
      </listitem>
      <listitem>
        <para>
          Required patch:
          <ulink url="&patch-root;/gcc-&gcc-version;-upstream_fixes-1.patch"/>
        </para>
      </listitem>
    </itemizedlist>

    <bridgehead renderas="sect3">GCC Ada Dependencies</bridgehead>

    <bridgehead renderas="sect4">Recommended</bridgehead>
    <para role="recommended">
      <xref linkend="dejagnu"/>, for tests
    </para>

    <para condition="html" role="usernotes">User Notes:
    <ulink url="&blfs-wiki;/gcc-ada"/></para>

  </sect2>

  <sect2 role="installation">
    <title>Installation of the GNAT binary</title>

    <para>Before unpacking and changing into the GCC source directory, first
    unpack the <application>GNAT</application> tarball, and change to the
    GNAT directory. Then, install the <application>GNAT</application> binary
    by running the following command as the
    <systemitem class="username">root</systemitem> user:</para>

<screen role="root"><userinput>make ins-all prefix=/opt/gnat</userinput></screen>

    <para>The <application>GNAT</application> compiler can be invoked by
    executing the <command>gcc</command> binary installed in <filename
    class="directory">/opt/gnat/bin</filename>.</para>

    <para>You may now remove the <application>GNAT</application>
    source directory if desired.</para>

    <para>Prepare to compile <application>GCC</application> by placing the
    <application>GNAT</application> version of <command>gcc</command> at the
    beginning of the <envar>PATH</envar> variable by using the following
    commands:</para>

<screen><userinput>PATH_HOLD=$PATH &amp;&amp;
export PATH=/opt/gnat/bin:$PATH_HOLD</userinput></screen>

    <para>Doing so has the drawback that the <application>GCC</application>
    and <application>Binutils</application> executables are taken
    from the just installed <application>GNAT</application> package, but the
    versions of those executables are outdated compared to those installed in
    LFS. This is not important for the <application>GCC</application> compilers,
    since they recompile themselves during the bootstrap process. On the other
    hand, the outdated <command>ld</command> and <command>as</command> tools
    are used all along. In order to use the LFS tools, issue as the
    <systemitem class="username">root</systemitem> user:</para>

<screen role="root"><userinput>find /opt/gnat -name ld -exec mv -v {} {}.old \;
find /opt/gnat -name as -exec mv -v {} {}.old \;</userinput></screen>

  </sect2>

  <sect2 role="installation">
    <title>Installation of GCC Ada</title>

    <para>As in LFS, fix a problem identified upstream:</para>

<screen><userinput>sed -i 's/if \((code.*))\)/if (\1 \&amp;\&amp; \!DEBUG_INSN_P (insn))/' gcc/sched-deps.c</userinput></screen>

    <para>Install <application>GCC Ada</application> by running the
    following commands:</para>

<screen><userinput>patch -Np1 -i ../gcc-&gcc-version;-upstream_fixes-1.patch &amp;&amp;
mkdir ../gcc-build &amp;&amp;
cd    ../gcc-build &amp;&amp;

../gcc-&gcc-version;/configure          \
    --prefix=/usr               \
    --disable-multilib          \
    --with-system-zlib          \
    --enable-languages=ada &amp;&amp;
make</userinput></screen>

    <para>If you have installed additional packages such as
    <application>Valgrind</application> and <application>GDB</application>,
    the <application>GCC</application> part of the testsuite will run more
    tests than in LFS. Some of those will report FAIL and others XPASS
    (pass when expected to FAIL). To run the tests, issue:</para>

<screen><userinput>ulimit -s 32768 &amp;&amp;
make -k check</userinput></screen>
<!-- The command above may error out, so using && may prevent the summary
to be run. -->

    <para>The tests are very long, and the results may be hard to find in the
    logs, specially if you use parallel jobs with make. You can get a summary
    of the tests with:</para>

<screen><userinput>../gcc-&gcc-version;/contrib/test_summary</userinput></screen>

    <para>Now, as the <systemitem class="username">root</systemitem> user:</para>

<screen role="root"><userinput>make install &amp;&amp;

mkdir -pv /usr/share/gdb/auto-load/usr/lib              &amp;&amp;
mv -v /usr/lib/*gdb.py /usr/share/gdb/auto-load/usr/lib &amp;&amp;

chown -v -R root:root \
    /usr/lib/gcc/*linux-gnu/&gcc-version;/include{,-fixed} \
    /usr/lib/gcc/*linux-gnu/&gcc-version;/ada{lib,include}</userinput></screen>

    <para>You should now remove the <application>GNAT</application>
    installation and perform other cleanups:</para>

<screen><userinput>rm -rf /opt/gnat &amp;&amp;
export PATH=$PATH_HOLD &amp;&amp;
unset PATH_HOLD</userinput></screen>

  </sect2>

  <sect2 role="commands">
    <title>Command Explanations</title>

    <para>
      <command>patch ... gcc-&gcc-version;-upstream_fixes-1.patch</command>:
      This patch corrects bugs in the C++ compiler, which lead to
      segmentation faults in some cases.
    </para>

    <para><command>mkdir ../gcc-build; cd ../gcc-build</command>: The
    <application>GCC</application> documentation recommends
    building the package in a dedicated build directory.</para>

    <para><parameter>--disable-multilib</parameter>: This parameter ensures
    that files are created for the specific architecture of your computer.</para>

    <para>
      <parameter>--with-system-zlib</parameter>: Uses the system
      <application>zlib</application> instead of the bundled one.
      <application>zlib</application> is used for compressing
      and uncompressing <application>GCC</application>'s intermediate
      language in LTO (Link Time Optimization) object files.
    </para>

    <para>
      <parameter>--enable-languages=ada</parameter>: Instructs the build system
      to build the Ada tools and compiler. It is unavoidable that the
      <application>C</application> and <application>C++</application>
      compilers be built too.
    </para>

    <para><command>ulimit -s 32768</command>: This command prevents several
    tests from running out of stack space.</para>

    <para><command>make -k check</command>: This command runs the test suite
    without stopping if any errors are encountered.</para>

    <para><command>../gcc-&gcc-version;/contrib/test_summary</command>: This
    command will produce a summary of the test suite results. You can append
    <command>| grep -A7 Summ</command> to the command to produce an even more
    condensed version of the summary. You may also wish to redirect the output
    to a file for review and comparison later on.</para>

    <para><command>chown -v -R root:root /usr/lib/gcc/*linux-gnu/...</command>:
    If the package is built by a user other than root, the ownership of the
    installed <filename class="directory">include</filename> and
    <filename class="directory">adalib</filename> directories (and their
    contents) will be incorrect. These commands change the ownership to the
    <systemitem class="username">root</systemitem> user and group.</para>

  </sect2>

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

    <segmentedlist>
      <segtitle>Installed Programs</segtitle>
      <segtitle>Installed Libraries</segtitle>
      <segtitle>Installed Directories</segtitle>

      <seglistitem>
        <seg>
          gnat, gnatbind, gnatchop, gnatclean, gnatfind, gnatkr,
          gnatlink, gnatls, gnatmake, gnatname, gnatprep, gnatxref,
          and a run-time executable, gnat1, in <filename class="directory">
          /usr/libexec/&lt;arch-triplet&gt;/&gcc-version;</filename>
        </seg>
        <seg>
          libgnat.{so,a}, libgnarl.{so,a} in <filename class="directory">
          /usr/lib/gcc/&lt;arch-triplet&gt;/&gcc-version;/adalib</filename>
        </seg>
        <seg>
          /usr/lib/gcc/&lt;arch-triplet&gt;/&gcc-version;/ada{include,lib}
        </seg>
      </seglistitem>
    </segmentedlist>

    <para>Only the Ada specific files are listed here. Others can be found at
    <ulink url="&lfs-root;/chapter06/gcc.html#contents-gcc"/> as they were
    initially installed during the building of LFS.</para>

    <variablelist>
      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
      <?dbfo list-presentation="list"?>
      <?dbhtml list-presentation="table"?>

      <varlistentry id="gnat">
        <term><command>gnat</command></term>
        <listitem>
          <para>is a wrapper that accepts a number of commands and calls
          the corresponding tool from the list below.</para>
          <indexterm zone="gcc-ada gnat">
            <primary sortas="b-gnat">gnat</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="gnatbind">
        <term><command>gnatbind</command></term>
        <listitem>
          <para>is used to bind compiled objects.</para>
          <indexterm zone="gcc-ada gnatbind">
            <primary sortas="b-gnatbind">gnatbind</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="gnatchop">
        <term><command>gnatchop</command></term>
        <listitem>
          <para>is useful for renaming files to meet the standard
          <application>Ada</application> default file naming conventions.</para>
          <indexterm zone="gcc-ada gnatchop">
            <primary sortas="b-gnatchop">gnatchop</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="gnatclean">
        <term><command>gnatclean</command></term>
        <listitem>
          <para>is used to remove files associated with a
          <application>GNAT</application> project.</para>
          <indexterm zone="gcc-ada gnatclean">
            <primary sortas="b-gnatclean">gnatclean</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="gnatfind">
        <term><command>gnatfind</command></term>
        <listitem>
          <para> is intended for locating definition and/or references to
          specified entities in a <application>GNAT</application> project.</para>
          <indexterm zone="gcc-ada gnatfind">
            <primary sortas="b-gnatfind">gnatfind</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="gnatkr">
        <term><command>gnatkr</command></term>
        <listitem>
          <para>is used to determine the crunched name for a given file, when
          crunched to a specified maximum length.</para>
          <indexterm zone="gcc-ada gnatkr">
            <primary sortas="b-gnatkr">gnatkr</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="gnatlink">
        <term><command>gnatlink</command></term>
        <listitem>
          <para>is used to link programs and build an executable file.</para>
          <indexterm zone="gcc-ada gnatlink">
            <primary sortas="b-gnatlink">gnatlink</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="gnatls">
        <term><command>gnatls</command></term>
        <listitem>
          <para>is the compiled unit browser.</para>
          <indexterm zone="gcc-ada gnatls">
            <primary sortas="b-gnatls">gnatls</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="gnatmake">
        <term><command>gnatmake</command></term>
        <listitem>
          <para>is the <application>Ada</application> compiler, which performs
          compilaton, binding and linking.</para>
          <indexterm zone="gcc-ada gnatmake">
            <primary sortas="b-gnatmake">gnatmake</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="gnatname">
        <term><command>gnatname</command></term>
        <listitem>
          <para>will list the files associated with a
          <application>GNAT</application> project.</para>
          <indexterm zone="gcc-ada gnatname">
            <primary sortas="b-gnatname">gnatname</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="gnatprep">
        <term><command>gnatprep</command></term>
        <listitem>
          <para>is the <application>GNAT</application> external
          preprocessor.</para>
          <indexterm zone="gcc-ada gnatprep">
            <primary sortas="b-gnatprep">gnatprep</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="gnatxref">
        <term><command>gnatxref</command></term>
        <listitem>
          <para>is similar to <command>gnatfind</command>, but generates
          a full report of all cross-references.</para>
          <indexterm zone="gcc-ada gnatxref">
            <primary sortas="b-gnatxref">gnatxref</primary>
          </indexterm>
        </listitem>
      </varlistentry>

    </variablelist>

  </sect2>

</sect1>