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git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@7612 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
138 lines
4.5 KiB
XML
138 lines
4.5 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
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"http://www.oasis-open.org/docbook/xml/4.4/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-tools-gcc-pass1" role="wrap">
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<?dbhtml filename="gcc-pass1.html"?>
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<title>GCC-&gcc-version; - Pass 1</title>
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<indexterm zone="ch-tools-gcc-pass1">
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<primary sortas="a-GCC">GCC</primary>
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<secondary>tools, pass 1</secondary>
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</indexterm>
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<sect2 role="package">
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<title/>
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<xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
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href="../chapter06/gcc.xml"
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xpointer="xpointer(/sect1/sect2[1]/para[1])"/>
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<segmentedlist>
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<segtitle>&buildtime;</segtitle>
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<segtitle>&diskspace;</segtitle>
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<seglistitem>
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<seg>&gcc-ch5p1-sbu;</seg>
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<seg>&gcc-ch5p1-du;</seg>
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</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>The GCC documentation recommends building GCC outside of the
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source directory in a dedicated build directory:</para>
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<screen><userinput>mkdir -v ../gcc-build
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cd ../gcc-build</userinput></screen>
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<para>Prepare GCC for compilation:</para>
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<screen><userinput>../gcc-&gcc-version;/configure --prefix=/tools \
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--with-local-prefix=/tools --disable-nls --enable-shared \
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--enable-languages=c</userinput></screen>
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<variablelist>
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<title>The meaning of the configure options:</title>
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<varlistentry>
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<term><parameter>--with-local-prefix=/tools</parameter></term>
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<listitem>
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<para>The purpose of this switch is to remove <filename
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class="directory">/usr/local/include</filename> from
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<command>gcc</command>'s include search path. This is not
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absolutely essential, however, it helps to minimize the
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influence of the host system.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>--enable-shared</parameter></term>
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<listitem>
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<para>This switch allows the building of <filename
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class="libraryfile">libgcc_s.so.1</filename> and
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<filename class="libraryfile">libgcc_eh.a</filename>.
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Having <filename class="libraryfile">libgcc_eh.a</filename>
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available ensures that the configure script for Glibc (the
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next package we compile) produces the proper results.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>--enable-languages=c</parameter></term>
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<listitem>
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<para>This option ensures that only the C compiler is built.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>Continue with compiling the package:</para>
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<screen><userinput>make bootstrap</userinput></screen>
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<variablelist>
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<title>The meaning of the make parameter:</title>
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<varlistentry>
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<term><parameter>bootstrap</parameter></term>
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<listitem>
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<para>This target does not just compile GCC, but compiles it
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several times. It uses the programs compiled in a first round
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to compile itself a second time, and then again a third time.
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It then compares these second and third compiles to make sure
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it can reproduce itself flawlessly. This also implies that it
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was compiled correctly.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>Compilation is now complete. At this point, the test suite would
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normally be run, but, as mentioned before, the test suite framework is
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not in place yet. The benefits of running the tests at this point
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are minimal since the programs from this first pass will soon be
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replaced.</para>
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<para>Install the package:</para>
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<screen><userinput>make install</userinput></screen>
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<para>As a finishing touch, create a symlink. Many programs and scripts
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run <command>cc</command> instead of <command>gcc</command>, which is
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used to keep programs generic and therefore usable on all kinds of UNIX
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systems where the GNU C compiler is not always installed. Running
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<command>cc</command> leaves the system administrator free to decide
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which C compiler to install.</para>
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<screen><userinput>ln -vs gcc /tools/bin/cc</userinput></screen>
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</sect2>
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<sect2 role="content">
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<title/>
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<para>Details on this package are located in
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<xref linkend="contents-gcc" role="."/></para>
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</sect2>
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</sect1>
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