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Building libsanitizer needs libcrypt. Disable it so we don't need to add libxcrypt into Chapter 6.
190 lines
7.1 KiB
XML
190 lines
7.1 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/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-pass2" role="wrap" xreflabel="gcc-pass2">
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<?dbhtml filename="gcc-pass2.html"?>
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<sect1info condition="script">
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<productname>gcc-pass2</productname>
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<productnumber>&gcc-version;</productnumber>
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<address>&gcc-url;</address>
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</sect1info>
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<title>GCC-&gcc-version; - Pass 2</title>
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<indexterm zone="ch-tools-gcc-pass2">
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<primary sortas="a-GCC">GCC</primary>
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<secondary>tools, pass 2</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/2001/XInclude"
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href="../chapter08/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-tmpp2-sbu;</seg>
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<seg>&gcc-tmpp2-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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<!--
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<para>First fix a problem with the latest version of glibc:</para>
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<screen><userinput remap="pre">patch -Np1 -i ../&gcc-upstream-fixes-patch;</userinput></screen>
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-->
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<para>As in the first build of GCC, the GMP, MPFR, and MPC packages are
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required. Unpack the tarballs and move them into the required directories:</para>
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<screen><userinput remap="pre">tar -xf ../mpfr-&mpfr-version;.tar.xz
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mv -v mpfr-&mpfr-version; mpfr
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tar -xf ../gmp-&gmp-version;.tar.xz
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mv -v gmp-&gmp-version; gmp
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tar -xf ../mpc-&mpc-version;.tar.gz
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mv -v mpc-&mpc-version; mpc</userinput></screen>
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<para>If building on x86_64, change the default directory name for 64-bit
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libraries to <quote>lib</quote>:</para>
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<screen><userinput remap="pre">case $(uname -m) in
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x86_64)
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sed -e '/m64=/s/lib64/lib/' -i.orig gcc/config/i386/t-linux64
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;;
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esac</userinput></screen>
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<para>Override the building rule of libgcc and libstdc++ headers, to
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allow building these libraries with POSIX threads support:</para>
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<screen><userinput remap="pre">sed '/thread_header =/s/@.*@/gthr-posix.h/' \
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-i libgcc/Makefile.in libstdc++-v3/include/Makefile.in</userinput></screen>
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<para>Create a separate build directory again:</para>
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<screen><userinput remap="pre">mkdir -v build
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cd build</userinput></screen>
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<para>Before starting to build GCC, remember to unset any environment
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variables that override the default optimization flags.</para>
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<para>Now prepare GCC for compilation:</para>
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<screen><userinput remap="configure">../configure \
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--build=$(../config.guess) \
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--host=$LFS_TGT \
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--target=$LFS_TGT \
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LDFLAGS_FOR_TARGET=-L$PWD/$LFS_TGT/libgcc \
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--prefix=/usr \
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--with-build-sysroot=$LFS \
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--enable-default-pie \
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--enable-default-ssp \
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--disable-nls \
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--disable-multilib \
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--disable-libatomic \
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--disable-libgomp \
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--disable-libquadmath \
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--disable-libsanitizer \
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--disable-libssp \
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--disable-libvtv \
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--enable-languages=c,c++</userinput></screen>
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<variablelist>
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<title>The meaning of the new configure options:</title><!-- WIP -->
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<varlistentry>
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<term><parameter>--with-build-sysroot=$LFS</parameter></term>
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<listitem>
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<para>Normally, using <parameter>--host</parameter> ensures that
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a cross-compiler is used for building GCC, and that compiler knows
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that it has to look for headers and libraries in <filename
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class="directory">$LFS</filename>. But the build system for GCC uses
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other tools, which are not aware of this location. This switch is
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needed so those tools will find the needed files in <filename
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class="directory">$LFS</filename>, and not on the host.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>--target=$LFS_TGT</parameter></term>
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<listitem>
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<para>We are cross-compiling GCC, so it's impossible to build
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target libraries (<filename class="libraryfile">libgcc</filename>
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and <filename class="libraryfile">libstdc++</filename>) with the
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previously compiled GCC binaries—those binaries won't run on the
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host. The GCC build system will attempt to use the host's
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C and C++ compilers as a workaround by default.
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Building the GCC target libraries with a different
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version of GCC is not supported, so using the host's compilers may cause
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the build to fail. This parameter ensures the libraries are built by GCC
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pass 1.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>LDFLAGS_FOR_TARGET=...</parameter></term>
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<listitem>
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<para>Allow <filename class="libraryfile">libstdc++</filename> to
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use the shared <filename class="libraryfile">libgcc</filename> being
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built in this pass, instead of the static version that was built in GCC
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pass 1. This is necessary to support C++ exception
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handling.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>--disable-libsanitizer</parameter></term>
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<listitem>
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<para>Disable GCC sanitizer runtime libraries. They are not
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needed for the temporary installation. This switch is necessary
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to build GCC without
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<systemitem class='library'>libcrypt</systemitem> installed for
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the target. In <xref linkend='ch-tools-gcc-pass1'/> it was
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implied by <parameter>--disable-libstdcxx</parameter>, but now we
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have to explicitly pass it.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>Compile the package:</para>
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<screen><userinput remap="make">make</userinput></screen>
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<para>Install the package:</para>
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<screen><userinput remap="install">make DESTDIR=$LFS install</userinput></screen>
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<para>As a finishing touch, create a utility 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 remap="install">ln -sv gcc $LFS/usr/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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