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git-svn-id: http://svn.linuxfromscratch.org/LFS/branches/testing/BOOK@4040 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
194 lines
6.8 KiB
XML
194 lines
6.8 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
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<!ENTITY % general-entities SYSTEM "../general.ent">
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%general-entities;
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]>
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<sect1 id="ch-system-gcc" xreflabel="GCC" role="wrap">
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<title>GCC-&gcc-version;</title>
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<?dbhtml filename="gcc.html"?>
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<indexterm zone="ch-system-gcc"><primary sortas="a-GCC">GCC</primary></indexterm>
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<sect2 role="package"><title/>
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<para>The GCC package contains the GNU compiler collection, which includes
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the C and C++ compilers.</para>
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<segmentedlist>
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<segtitle>&buildtime;</segtitle>
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<segtitle>&diskspace;</segtitle>
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<seglistitem><seg>11.7 SBU</seg><seg>294 MB</seg></seglistitem>
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</segmentedlist>
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<segmentedlist>
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<segtitle>GCC installation depends on</segtitle>
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<seglistitem><seg>Bash, Binutils, Coreutils, Diffutils, Findutils,
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Gawk, Gettext, Glibc, Grep, Make, Perl, Sed, Texinfo</seg></seglistitem>
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</segmentedlist>
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</sect2>
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<sect2 role="installation">
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<title>Installation of GCC</title>
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<para>This package is known to have issues when its default
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optimization flags (including the <parameter>-march</parameter> and
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<parameter>-mcpu</parameter> options) are changed. If any environment
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variables that override default optimizations have been defined, such
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as <emphasis>CFLAGS</emphasis> and <emphasis>CXXFLAGS</emphasis>,
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unset them when building GCC.</para>
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<para>Unpack both the gcc-core and the gcc-g++ tarballs -- they will
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unpack into the same directory. Likewise, extract the gcc-testsuite
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package. The full GCC package contains additional compilers.
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Instructions for building these can be found at <ulink
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url="&blfs-root;view/stable/general/gcc.html"/>.</para>
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<para>Apply only the No-Fixincludes patch (not the Specs patch) also
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used in the previous chapter:</para>
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<screen><userinput>patch -Np1 -i ../gcc-&gcc-version;-no_fixincludes-1.patch</userinput></screen>
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<para>Apply a sed substitution that will suppress the installation of
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<filename class="libraryfile">libiberty.a</filename>. The version of
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<filename class="libraryfile">libiberty.a</filename> provided by
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Binutils will be used instead:</para>
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<screen><userinput>sed -i 's/install_to_$(INSTALL_DEST) //' libiberty/Makefile.in</userinput></screen>
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<para>The GCC documentation recommends building GCC outside of the source
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directory in a dedicated build directory:</para>
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<screen><userinput>mkdir ../gcc-build
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cd ../gcc-build</userinput></screen>
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<para>Now prepare GCC for compilation:</para>
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<screen><userinput>../gcc-&gcc-version;/configure --prefix=/usr \
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--libexecdir=/usr/lib --enable-shared --enable-threads=posix \
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--enable-__cxa_atexit --enable-clocale=gnu --enable-languages=c,c++</userinput></screen>
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<para>Compile the package:</para>
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<screen><userinput>make</userinput></screen>
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<important><para>The test suite for GCC in this section is considered
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critical. Do not skip it under any circumstance.</para></important>
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<para>Test the results, but don't stop at errors:</para>
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<screen><userinput>make -k check</userinput></screen>
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<para>Some of the errors are known issues and were noted in the
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previous chapter. The test suite notes from <xref
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linkend="ch-tools-gcc-pass2"/> are still relevant here. Be sure to
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refer back to them as necessary.</para>
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<para>Iinstall the package:</para>
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<screen><userinput>make install</userinput></screen>
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<para>Some packages expect the C PreProcessor to be installed in the
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<filename class="directory">/lib</filename> directory.
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To support those packages, create this symlink:</para>
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<screen><userinput>ln -s ../usr/bin/cpp /lib</userinput></screen>
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<para>Many packages use the name <command>cc</command> to call the C
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compiler. To satisfy those packages, create a symlink:</para>
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<screen><userinput>ln -s gcc /usr/bin/cc</userinput></screen>
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<note><para>At this point it is strongly recommended to repeat the
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sanity check we performed earlier in this chapter. Refer back to <xref
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linkend="ch-system-readjusting"/> and repeat the check. If the results
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are in error, then the most likely reason is that the GCC Specs patch
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from <xref linkend="chapter-temporary-tools"/> was erroneously applied
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here.</para></note>
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</sect2>
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<sect2 id="contents-gcc" role="content"><title>Contents of GCC</title>
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<segmentedlist>
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<segtitle>Installed programs</segtitle>
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<segtitle>Installed libraries</segtitle>
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<seglistitem><seg>c++, cc (link to gcc),
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cc1, cc1plus, collect2, cpp, g++, gcc, gccbug, and gcov</seg>
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<seg>libgcc.a, libgcc_eh.a, libgcc_s.so, libstdc++.[a,so] and libsupc++.a</seg></seglistitem>
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</segmentedlist>
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<variablelist><bridgehead renderas="sect3">Short descriptions</bridgehead>
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<?dbfo list-presentation="list"?>
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<varlistentry id="cpp">
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<term><command>cpp</command></term>
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<listitem>
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<para>the C preprocessor. It is used by the compiler expand the
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#include, #define, and similar statements in the source files.</para>
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<indexterm zone="ch-system-gcc cpp"><primary sortas="b-cpp">cpp</primary></indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="g">
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<term><command>g++</command></term>
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<listitem>
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<para>the C++ compiler.</para>
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<indexterm zone="ch-system-gcc g"><primary sortas="b-g++">g++</primary></indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="gcc">
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<term><command>gcc</command></term>
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<listitem>
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<para>the C compiler.</para>
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<indexterm zone="ch-system-gcc gcc"><primary sortas="b-gcc">gcc</primary></indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="gccbug">
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<term><command>gccbug</command></term>
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<listitem>
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<para>a shell script used to help create useful bug reports.</para>
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<indexterm zone="ch-system-gcc gccbug"><primary sortas="b-gccbug">gccbug</primary></indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="gcov">
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<term><command>gcov</command></term>
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<listitem>
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<para>a coverage testing tool. It is used to analyze programs to
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determine where optimizations will have the most effect.</para>
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<indexterm zone="ch-system-gcc gcov"><primary sortas="b-gcov">gcov</primary></indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="libgcc">
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<term><filename class="libraryfile">libgcc*</filename></term>
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<listitem>
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<para>contains run-time support for <command>gcc</command>.</para>
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<indexterm zone="ch-system-gcc libgcc"><primary sortas="c-libgcc*">libgcc*</primary></indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="libstdc">
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<term><filename class="libraryfile">libstdc++</filename></term>
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<listitem>
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<para>the standard C++ library.</para>
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<indexterm zone="ch-system-gcc libstdc"><primary sortas="c-libstdc++">libstdc++</primary></indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="libsupc">
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<term><filename class="libraryfile">libsupc++</filename></term>
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<listitem>
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<para>provides supporting routines for the c++ programming language.</para>
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<indexterm zone="ch-system-gcc libsupc"><primary sortas="c-libsupc++">libsupc++</primary></indexterm>
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</listitem>
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</varlistentry>
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</variablelist>
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</sect2>
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</sect1>
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