| 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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| 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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| 4 | <!ENTITY % general-entities SYSTEM "../general.ent">
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| 5 | %general-entities;
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| 6 | ]>
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| 7 |
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| 8 | <sect1 id="ch-tools-gcc-pass2" role="wrap" xreflabel="gcc-pass2">
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| 9 | <?dbhtml filename="gcc-pass2.html"?>
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| 10 |
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| 11 | <sect1info condition="script">
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| 12 | <productname>gcc-pass2</productname>
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| 13 | <productnumber>&gcc-version;</productnumber>
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| 14 | <address>&gcc-url;</address>
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| 15 | </sect1info>
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| 16 |
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| 17 | <title>GCC-&gcc-version; - Pass 2</title>
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| 18 |
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| 19 | <indexterm zone="ch-tools-gcc-pass2">
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| 20 | <primary sortas="a-GCC">GCC</primary>
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| 21 | <secondary>tools, pass 2</secondary>
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| 22 | </indexterm>
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| 23 |
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| 24 | <sect2 role="package">
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| 25 | <title/>
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| 26 |
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| 27 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
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| 28 | href="../chapter08/gcc.xml"
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| 29 | xpointer="xpointer(/sect1/sect2[1]/para[1])"/>
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| 30 |
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| 31 | <segmentedlist>
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| 32 | <segtitle>&buildtime;</segtitle>
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| 33 | <segtitle>&diskspace;</segtitle>
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| 34 |
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| 35 | <seglistitem>
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| 36 | <seg>&gcc-tmpp2-sbu;</seg>
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| 37 | <seg>&gcc-tmpp2-du;</seg>
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| 38 | </seglistitem>
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| 39 | </segmentedlist>
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| 40 |
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| 41 | </sect2>
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| 42 |
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| 43 | <sect2 role="installation">
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| 44 | <title>Installation of GCC</title>
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| 45 | <!--
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| 46 | <para>First fix a problem with the latest version of glibc:</para>
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| 47 |
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| 48 | <screen><userinput remap="pre">patch -Np1 -i ../&gcc-upstream-fixes-patch;</userinput></screen>
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| 49 | -->
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| 50 | <para>As in the first build of GCC, the GMP, MPFR, and MPC packages are
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| 51 | required. Unpack the tarballs and move them into the required directories:</para>
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| 52 |
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| 53 | <screen><userinput remap="pre">tar -xf ../mpfr-&mpfr-version;.tar.xz
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| 54 | mv -v mpfr-&mpfr-version; mpfr
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| 55 | tar -xf ../gmp-&gmp-version;.tar.xz
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| 56 | mv -v gmp-&gmp-version; gmp
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| 57 | tar -xf ../mpc-&mpc-version;.tar.gz
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| 58 | mv -v mpc-&mpc-version; mpc</userinput></screen>
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| 59 |
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| 60 |
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| 61 | <para arch="default">If building on x86_64, change the default directory name for 64-bit
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| 62 | libraries to <quote>lib</quote>:</para>
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| 63 |
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| 64 | <screen arch="default"><userinput remap="pre">case $(uname -m) in
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| 65 | x86_64)
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| 66 | sed -e '/m64=/s/lib64/lib/' -i.orig gcc/config/i386/t-linux64
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| 67 | ;;
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| 68 | esac</userinput></screen>
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| 69 |
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| 70 | <para arch="ml_32,ml_x32,ml_all">Change the default directory name for the
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| 71 | libraries:</para>
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| 72 |
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| 73 | <screen arch="ml_32,ml_x32,ml_all"><userinput remap="pre">sed -e '/m64=/s/lib64/lib/' \
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| 74 | -e '/m32=/s/m32=.*/m32=..\/lib32$(call if_multiarch,:i386-linux-gnu)/' \
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| 75 | -i.orig gcc/config/i386/t-linux64</userinput></screen>
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| 76 |
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| 77 | <para>Override the building rule of libgcc and libstdc++ headers, to
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| 78 | allow building these libraries with POSIX threads support:</para>
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| 79 |
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| 80 | <screen><userinput remap="pre">sed '/thread_header =/s/@.*@/gthr-posix.h/' \
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| 81 | -i libgcc/Makefile.in libstdc++-v3/include/Makefile.in</userinput></screen>
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| 82 |
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| 83 | <para>Create a separate build directory again:</para>
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| 84 |
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| 85 | <screen><userinput remap="pre">mkdir -v build
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| 86 | cd build</userinput></screen>
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| 87 |
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| 88 | <para>Before starting to build GCC, remember to unset any environment
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| 89 | variables that override the default optimization flags.</para>
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| 90 |
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| 91 | <para>Now prepare GCC for compilation:</para>
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| 92 |
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| 93 | <screen arch="default"><userinput remap="configure">../configure \
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| 94 | --build=$(../config.guess) \
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| 95 | --host=$LFS_TGT \
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| 96 | --target=$LFS_TGT \
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| 97 | LDFLAGS_FOR_TARGET=-L$PWD/$LFS_TGT/libgcc \
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| 98 | --prefix=/usr \
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| 99 | --with-build-sysroot=$LFS \
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| 100 | --enable-default-pie \
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| 101 | --enable-default-ssp \
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| 102 | --disable-nls \
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| 103 | --disable-multilib \
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| 104 | --disable-libatomic \
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| 105 | --disable-libgomp \
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| 106 | --disable-libquadmath \
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| 107 | --disable-libsanitizer \
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| 108 | --disable-libssp \
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| 109 | --disable-libvtv \
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| 110 | --enable-languages=c,c++</userinput></screen>
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| 111 | <screen arch="ml_32,ml_x32,ml_all"><userinput remap="configure"
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| 112 | arch="ml_32">mlist=m64,m32</userinput><userinput remap="configure"
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| 113 | arch="ml_x32">mlist=m64,mx32</userinput><userinput remap="configure"
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| 114 | arch="ml_all">mlist=m64,m32,mx32</userinput>
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| 115 | <userinput remap="configure">../configure \
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| 116 | --build=$(../config.guess) \
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| 117 | --host=$LFS_TGT \
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| 118 | --target=$LFS_TGT \
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| 119 | LDFLAGS_FOR_TARGET=-L$PWD/$LFS_TGT/libgcc \
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| 120 | --prefix=/usr \
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| 121 | --with-build-sysroot=$LFS \
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| 122 | --enable-default-pie \
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| 123 | --enable-default-ssp \
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| 124 | --enable-initfini-array \
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| 125 | --disable-nls \
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| 126 | --enable-multilib --with-multilib-list=$mlist \
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| 127 | --disable-decimal-float \
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| 128 | --disable-libatomic \
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| 129 | --disable-libgomp \
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| 130 | --disable-libquadmath \
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| 131 | --disable-libssp \
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| 132 | --disable-libvtv \
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| 133 | --enable-languages=c,c++</userinput></screen>
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| 134 | <!--
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| 135 | LDFLAGS_FOR_TARGET="-L$PWD/$LFS_TGT/libgcc -L$PWD/$LFS_TGT/32/libgcc -L$PWD/$LFS_TGT/x32/libgcc" \
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| 136 | -->
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| 137 | <variablelist>
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| 138 | <title>The meaning of the new configure options:</title><!-- WIP -->
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| 139 |
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| 140 | <varlistentry>
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| 141 | <term><parameter>--with-build-sysroot=$LFS</parameter></term>
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| 142 | <listitem>
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| 143 | <para>Normally, using <parameter>--host</parameter> ensures that
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| 144 | a cross-compiler is used for building GCC, and that compiler knows
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| 145 | that it has to look for headers and libraries in <filename
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| 146 | class="directory">$LFS</filename>. But the build system for GCC uses
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| 147 | other tools, which are not aware of this location. This switch is
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| 148 | needed so those tools will find the needed files in <filename
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| 149 | class="directory">$LFS</filename>, and not on the host.</para>
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| 150 | </listitem>
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| 151 | </varlistentry>
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| 152 |
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| 153 | <varlistentry>
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| 154 | <term><parameter>--target=$LFS_TGT</parameter></term>
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| 155 | <listitem>
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| 156 | <para>We are cross-compiling GCC, so it's impossible to build
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| 157 | target libraries (<filename class="libraryfile">libgcc</filename>
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| 158 | and <filename class="libraryfile">libstdc++</filename>) with the
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| 159 | previously compiled GCC binaries—those binaries won't run on the
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| 160 | host. The GCC build system will attempt to use the host's
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| 161 | C and C++ compilers as a workaround by default.
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| 162 | Building the GCC target libraries with a different
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| 163 | version of GCC is not supported, so using the host's compilers may cause
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| 164 | the build to fail. This parameter ensures the libraries are built by GCC
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| 165 | pass 1.</para>
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| 166 | </listitem>
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| 167 | </varlistentry>
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| 168 |
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| 169 | <varlistentry>
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| 170 | <term><parameter>LDFLAGS_FOR_TARGET=...</parameter></term>
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| 171 | <listitem>
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| 172 | <para>Allow <filename class="libraryfile">libstdc++</filename> to
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| 173 | use the shared <filename class="libraryfile">libgcc</filename> being
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| 174 | built in this pass, instead of the static version that was built in GCC
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| 175 | pass 1. This is necessary to support C++ exception
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| 176 | handling.</para>
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| 177 | </listitem>
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| 178 | </varlistentry>
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| 179 |
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| 180 | <varlistentry>
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| 181 | <term><parameter>--disable-libsanitizer</parameter></term>
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| 182 | <listitem>
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| 183 | <para>Disable GCC sanitizer runtime libraries. They are not
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| 184 | needed for the temporary installation. This switch is necessary
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| 185 | to build GCC without
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| 186 | <systemitem class='library'>libcrypt</systemitem> installed for
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| 187 | the target. In <xref linkend='ch-tools-gcc-pass1'/> it was
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| 188 | implied by <parameter>--disable-libstdcxx</parameter>, but now we
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| 189 | have to explicitly pass it.</para>
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| 190 | </listitem>
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| 191 | </varlistentry>
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| 192 |
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| 193 | </variablelist>
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| 194 |
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| 195 | <para>Compile the package:</para>
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| 196 |
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| 197 | <screen><userinput remap="make">make</userinput></screen>
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| 198 |
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| 199 | <para>Install the package:</para>
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| 200 |
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| 201 | <screen><userinput remap="install">make DESTDIR=$LFS install</userinput></screen>
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| 202 |
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| 203 | <para>As a finishing touch, create a utility symlink. Many programs and scripts
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| 204 | run <command>cc</command> instead of <command>gcc</command>, which is
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| 205 | used to keep programs generic and therefore usable on all kinds of UNIX
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| 206 | systems where the GNU C compiler is not always installed. Running
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| 207 | <command>cc</command> leaves the system administrator free to decide
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| 208 | which C compiler to install:</para>
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| 209 |
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| 210 | <screen><userinput remap="install">ln -sv gcc $LFS/usr/bin/cc</userinput></screen>
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| 211 |
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| 212 | </sect2>
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| 213 |
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| 214 | <sect2 role="content">
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| 215 | <title/>
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| 216 |
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| 217 | <para>Details on this package are located in
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| 218 | <xref linkend="contents-gcc" role="."/></para>
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| 219 |
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| 220 | </sect2>
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| 221 |
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| 222 | </sect1>
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