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233 lines
8.5 KiB
XML
233 lines
8.5 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-pass1" role="wrap" xreflabel="gcc-pass1">
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<?dbhtml filename="gcc-pass1.html"?>
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<sect1info condition="script">
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<productname>gcc-pass1</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 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/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-tmpp1-sbu;</seg>
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<seg>&gcc-tmpp1-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 Cross GCC</title>
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<para>GCC requires the GMP, MPFR and MPC packages. As these packages may
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not be included in your host distribution, they will be built with
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GCC. Unpack each package into the GCC source directory and rename the
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resulting directories so the GCC build procedures will automatically
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use them:</para>
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<note><para>There are frequent misunderstandings about this chapter. The
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procedures are the same as every other chapter, as explained earlier (<xref
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linkend='buildinstr'/>). First, extract the gcc-&gcc-version; tarball from the sources
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directory, and then change to the directory created. Only then should you
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proceed with the instructions below.</para></note>
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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>On x86_64 hosts, set the default directory name for
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64-bit libraries to <quote>lib</quote>:</para>
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<screen><userinput remap="pre">case $(uname -m) in
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x86_64)
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sed -e '/m64=/s/lib64/lib/' \
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-i.orig gcc/config/i386/t-linux64
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;;
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esac</userinput></screen>
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<para>The GCC documentation recommends building GCC
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in a dedicated build directory:</para>
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<screen><userinput remap="pre">mkdir -v build
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cd build</userinput></screen>
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<para>Prepare GCC for compilation:</para>
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<screen><userinput remap="configure">../configure \
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--target=$LFS_TGT \
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--prefix=$LFS/tools \
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--with-glibc-version=&glibc-version; \
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--with-sysroot=$LFS \
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--with-newlib \
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--without-headers \
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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-shared \
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--disable-multilib \
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--disable-threads \
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--disable-libatomic \
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--disable-libgomp \
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--disable-libquadmath \
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--disable-libssp \
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--disable-libvtv \
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--disable-libstdcxx \
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--enable-languages=c,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-glibc-version=&glibc-version;</parameter></term>
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<listitem>
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<para>This option specifies the version of Glibc which will be
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used on the target. It is not relevant to the libc of the host
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distro because everything compiled by pass1 GCC will run in the
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chroot environment, which is isolated from libc of the host
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distro.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>--with-newlib</parameter></term>
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<listitem>
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<para>Since a working C library is not yet available, this ensures
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that the inhibit_libc constant is defined when building libgcc. This prevents
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the compiling of any code that requires libc support.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>--without-headers</parameter></term>
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<listitem>
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<para>When creating a complete cross-compiler, GCC requires
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standard headers compatible with the target system. For our
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purposes these headers will not be needed. This switch prevents
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GCC from looking for them.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>--enable-default-pie and
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--enable-default-ssp</parameter></term>
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<listitem>
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<para>Those switches allow GCC to compile programs with
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some hardening security features (more information on those in
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the <xref linkend="pie-ssp-info"/> in chapter 8) by default. The
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are not strictly needed at this stage, since the compiler will
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only produce temporary executables. But it is cleaner to have the
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temporary packages be as close as possible to the final ones.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>--disable-shared</parameter></term>
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<listitem>
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<para>This switch forces GCC to link its internal libraries
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statically. We need this because the shared libraries require Glibc,
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which is not yet installed on the target system.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>--disable-multilib</parameter></term>
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<listitem>
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<para>On x86_64, LFS does not support a multilib configuration.
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This switch is harmless for x86.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>--disable-threads,
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--disable-libatomic, --disable-libgomp,
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--disable-libquadmath, --disable-libssp, --disable-libvtv,
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--disable-libstdcxx</parameter></term>
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<listitem>
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<para>These switches disable support for
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threading, libatomic, libgomp, libquadmath, libssp,
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libvtv, and the C++ standard library respectively. These features
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may fail to compile when building a cross-compiler and are not
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necessary for the task of cross-compiling the temporary libc.</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,c++</parameter></term>
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<listitem>
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<para>This option ensures that only the C and C++ compilers are built.
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These are the only languages needed now.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>Compile GCC by running:</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 install</userinput></screen>
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<para>This build of GCC has installed a couple of internal system
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headers. Normally one of them, <filename>limits.h</filename>, would in turn
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include the corresponding system <filename>limits.h</filename> header, in
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this case, <filename>$LFS/usr/include/limits.h</filename>. However, at the
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time of this build of GCC <filename>$LFS/usr/include/limits.h</filename>
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does not exist, so the internal header that has just been installed is a
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partial, self-contained file and does not include the extended features of
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the system header. This is adequate for building Glibc, but the full
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internal header will be needed later. Create a full version of the internal
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header using a command that is identical to what the GCC build system does
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in normal circumstances:</para>
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<note>
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<para>The command below shows an example of nested command substitution
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using two methods: backquotes and a <literal>$()</literal> construct.
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It could be rewritten using the same method for both substitutions,
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but is shown this way to demonstrate how they can be mixed. Generally
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the <literal>$()</literal> method is preferred.</para>
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</note>
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<screen><userinput remap="install">cd ..
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cat gcc/limitx.h gcc/glimits.h gcc/limity.h > \
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`dirname $($LFS_TGT-gcc -print-libgcc-file-name)`/include/limits.h</userinput></screen>
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</sect2>
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<sect2 role="content">
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<title/>
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|
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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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