[1fa2099] | 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">
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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</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="../chapter06/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-ch5p2-sbu;</seg>
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| 37 | <seg>&gcc-ch5p2-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>Our first build of GCC has installed a couple of internal system
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| 47 | headers. Normally one of them, <filename>limits.h</filename>, will in turn
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| 48 | include the corresponding system <filename>limits.h</filename> header, in
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| 49 | this case, <filename>/tools/include/limits.h</filename>. However, at the
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| 50 | time of the first build of gcc <filename>/tools/include/limits.h</filename>
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| 51 | did not exist, so the internal header that GCC installed is a partial,
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| 52 | self-contained file and does not include the extended features of the
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| 53 | system header. This was adequate for building the temporary libc, but this
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| 54 | build of GCC now requires the full internal header. Create a full version
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| 55 | of the internal header using a command that is identical to what the GCC
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| 56 | build system does in normal circumstances:</para>
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| 57 |
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| 58 | <screen><userinput remap="pre">cat gcc/limitx.h gcc/glimits.h gcc/limity.h > \
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| 59 | `dirname $($LFS_TGT-gcc -print-libgcc-file-name)`/include-fixed/limits.h</userinput></screen>
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| 60 | <!--
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| 61 | <para>For x86 machines, the limited number of registers is a bottleneck
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| 62 | for the system. Free one up by not using a frame pointer that is not
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| 63 | needed:</para>
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| 64 |
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| 65 | <screen><userinput remap="pre">case `uname -m` in
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| 66 | i?86) sed -i 's/^T_CFLAGS =$/& -fomit-frame-pointer/' gcc/Makefile.in ;;
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| 67 | esac</userinput></screen>
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| 68 | -->
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| 69 | <para>Once again, change the location of GCC's default dynamic linker to
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| 70 | use the one installed in <filename
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| 71 | class="directory">/tools</filename>.</para>
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| 72 |
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| 73 | <screen><userinput remap="pre">for file in gcc/config/{linux,i386/linux{,64}}.h
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| 74 | do
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| 75 | cp -uv $file{,.orig}
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[8eb3fe4] | 76 | sed -e 's@/lib\(64\)\?\(32\)\?\(x32\)\?/ld@/tools&@g' \
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[1fa2099] | 77 | -e 's@/usr@/tools@g' $file.orig > $file
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| 78 | echo '
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| 79 | #undef STANDARD_STARTFILE_PREFIX_1
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| 80 | #undef STANDARD_STARTFILE_PREFIX_2
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| 81 | #define STANDARD_STARTFILE_PREFIX_1 "/tools/lib/"
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| 82 | #define STANDARD_STARTFILE_PREFIX_2 ""' >> $file
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| 83 | touch $file.orig
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| 84 | done</userinput></screen>
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| 85 |
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[8eb3fe4] | 86 | <para arch="default">If building on x86_64, change the default directory
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| 87 | name for 64-bit libraries to <quote>lib</quote>:</para>
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[1fa2099] | 88 |
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[8eb3fe4] | 89 | <screen arch="default"><userinput remap="pre">case $(uname -m) in
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[1fa2099] | 90 | x86_64)
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| 91 | sed -e '/m64=/s/lib64/lib/' \
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| 92 | -i.orig gcc/config/i386/t-linux64
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| 93 | ;;
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| 94 | esac</userinput></screen>
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| 95 |
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[ee1a413] | 96 | <para arch="ml_32,ml_x32,ml_all">Change the default directory name for 64-bit
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[8eb3fe4] | 97 | libraries to <quote>lib</quote>:</para>
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[1fa2099] | 98 |
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[ee1a413] | 99 | <screen arch="ml_32,ml_x32,ml_all"><userinput remap="pre">sed -e '/m64=/s/lib64/lib/' \
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[8eb3fe4] | 100 | -i.orig gcc/config/i386/t-linux64
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| 101 | cat > gcc/config/i386/t-linux64 <<"EOF"
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| 102 | comma=,
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| 103 | MULTILIB_OPTIONS = $(subst $(comma),/,$(TM_MULTILIB_CONFIG))
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| 104 | MULTILIB_DIRNAMES = $(patsubst m%, %, $(subst /, ,$(MULTILIB_OPTIONS)))
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| 105 | MULTILIB_OSDIRNAMES = m64=../lib$(call if_multiarch,:x86_64-linux-gnu)
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| 106 | MULTILIB_OSDIRNAMES+= m32=../lib32$(call if_multiarch,:i386-linux-gnu)
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| 107 | MULTILIB_OSDIRNAMES+= mx32=../libx32$(call if_multiarch,:x86_64-linux-gnux32)
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| 108 | EOF</userinput></screen>
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| 109 |
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| 110 | <para arch="default">As in the first build of GCC it requires the GMP,
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| 111 | MPFR, and MPC packages. Unpack the tarballs and move them into the
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| 112 | required directory names:</para>
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| 113 |
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[ee1a413] | 114 | <para arch="ml_32,ml_x32,ml_all">As in the first build of GCC it requires the GMP,
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[8eb3fe4] | 115 | ISL, MPFR, and MPC packages. Unpack the tarballs and move them into the
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| 116 | required directory names:</para>
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| 117 |
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| 118 | <screen arch="default"><userinput remap="pre">tar -xf ../mpfr-&mpfr-version;.tar.xz
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[1fa2099] | 119 | mv -v mpfr-&mpfr-version; mpfr
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| 120 | tar -xf ../gmp-&gmp-version;.tar.xz
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| 121 | mv -v gmp-&gmp-version; gmp
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| 122 | tar -xf ../mpc-&mpc-version;.tar.gz
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| 123 | mv -v mpc-&mpc-version; mpc</userinput></screen>
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[ee1a413] | 124 | <screen arch="ml_32,ml_x32,ml_all"><userinput remap="pre">tar -xf ../mpfr-&mpfr-version;.tar.xz
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[8eb3fe4] | 125 | mv -v mpfr-&mpfr-version; mpfr
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| 126 | tar -xf ../gmp-&gmp-version;.tar.xz
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| 127 | mv -v gmp-&gmp-version; gmp
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| 128 | tar -xf ../mpc-&mpc-version;.tar.gz
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| 129 | mv -v mpc-&mpc-version; mpc
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| 130 | tar -xf ../isl-&isl-version;.tar.xz
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| 131 | mv -v isl-&isl-version; isl</userinput></screen>
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| 132 |
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| 133 | <!-- Following patch might be obsolete with gcc >= 8.2.1 -->
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[ee1a413] | 134 | <para arch="ml_32,ml_x32,ml_all">Fix an issue with isl-&isl-version;:</para>
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[8eb3fe4] | 135 |
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[ee1a413] | 136 | <screen arch="ml_32,ml_x32,ml_all"><userinput remap="pre">sed -e "/#include <isl\/schedule_node.h>/ a#include <isl/id.h>\n#include <isl/space.h>" \
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[8eb3fe4] | 137 | -i gcc/graphite.h</userinput></screen>
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[1fa2099] | 138 |
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| 139 | <para>Create a separate build directory again:</para>
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| 140 |
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| 141 | <screen><userinput remap="pre">mkdir -v build
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| 142 | cd build</userinput></screen>
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| 143 |
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| 144 | <para>Before starting to build GCC, remember to unset any environment
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| 145 | variables that override the default optimization flags.</para>
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| 146 |
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| 147 | <para>Now prepare GCC for compilation:</para>
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| 148 |
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[8eb3fe4] | 149 | <screen arch="default"><userinput remap="configure">CC=$LFS_TGT-gcc \
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[1fa2099] | 150 | CXX=$LFS_TGT-g++ \
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| 151 | AR=$LFS_TGT-ar \
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| 152 | RANLIB=$LFS_TGT-ranlib \
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| 153 | ../configure \
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| 154 | --prefix=/tools \
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| 155 | --with-local-prefix=/tools \
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| 156 | --with-native-system-header-dir=/tools/include \
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| 157 | --enable-languages=c,c++ \
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| 158 | --disable-libstdcxx-pch \
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| 159 | --disable-multilib \
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| 160 | --disable-bootstrap \
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| 161 | --disable-libgomp</userinput></screen>
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| 162 |
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[ee1a413] | 163 | <screen arch="ml_32,ml_x32,ml_all"><userinput remap="configure">mlist="m64"</userinput>
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| 164 | <userinput arch="ml_32,ml_all" remap="configure">mlist="$mlist,m32"</userinput>
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| 165 | <userinput arch="ml_x32,ml_all" remap="configure">mlist="$mlist,mx32"</userinput>
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| 166 | <userinput remap="configure">CC=$LFS_TGT-gcc \
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[8eb3fe4] | 167 | CXX=$LFS_TGT-g++ \
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| 168 | AR=$LFS_TGT-ar \
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| 169 | RANLIB=$LFS_TGT-ranlib \
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| 170 | ../configure \
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| 171 | --prefix=/tools \
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| 172 | --with-local-prefix=/tools \
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| 173 | --with-native-system-header-dir=/tools/include \
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| 174 | --enable-languages=c,c++ \
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| 175 | --disable-libstdcxx-pch \
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| 176 | --enable-multilib \
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[ee1a413] | 177 | --with-multilib-list=$mlist \
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[8eb3fe4] | 178 | --with-system-zlib \
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| 179 | --disable-bootstrap \
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| 180 | --disable-libgomp</userinput></screen>
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| 181 |
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[1fa2099] | 182 | <variablelist>
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| 183 | <title>The meaning of the new configure options:</title>
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| 184 |
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| 185 | <varlistentry>
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| 186 | <term><parameter>--enable-languages=c,c++</parameter></term>
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| 187 | <listitem>
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| 188 | <para>This option ensures that both the C and C++ compilers are
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| 189 | built.</para>
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| 190 | </listitem>
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| 191 | </varlistentry>
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| 192 |
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| 193 | <varlistentry>
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| 194 | <term><parameter>--disable-libstdcxx-pch</parameter></term>
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| 195 | <listitem>
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| 196 | <para>Do not build the pre-compiled header (PCH) for
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| 197 | <filename class="libraryfile">libstdc++</filename>. It takes up a
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| 198 | lot of space, and we have no use for it.</para>
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| 199 | </listitem>
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| 200 | </varlistentry>
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| 201 |
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| 202 | <varlistentry>
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| 203 | <term><parameter>--disable-bootstrap</parameter></term>
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| 204 | <listitem>
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| 205 | <para>For native builds of GCC, the default is to do a "bootstrap"
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| 206 | build. This does not just compile GCC, but compiles it several times.
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| 207 | It uses the programs compiled in a first round to compile itself a
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| 208 | second time, and then again a third time. The second and third
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| 209 | iterations are compared to make sure it can reproduce itself
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| 210 | flawlessly. This also implies that it was compiled correctly.
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| 211 | However, the LFS build method should provide a solid compiler
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| 212 | without the need to bootstrap each time.</para>
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| 213 | </listitem>
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| 214 | </varlistentry>
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| 215 |
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| 216 | </variablelist>
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| 217 |
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| 218 | <para>Compile the package:</para>
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| 219 |
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| 220 | <screen><userinput remap="make">make</userinput></screen>
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| 221 |
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| 222 | <para>Install the package:</para>
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| 223 |
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| 224 | <screen><userinput remap="install">make install</userinput></screen>
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| 225 |
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| 226 | <para>As a finishing touch, create a symlink. Many programs and scripts
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| 227 | run <command>cc</command> instead of <command>gcc</command>, which is
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| 228 | used to keep programs generic and therefore usable on all kinds of UNIX
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| 229 | systems where the GNU C compiler is not always installed. Running
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| 230 | <command>cc</command> leaves the system administrator free to decide
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| 231 | which C compiler to install:</para>
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| 232 |
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| 233 | <screen><userinput remap="install">ln -sv gcc /tools/bin/cc</userinput></screen>
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| 234 |
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| 235 | <caution>
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| 236 | <para>At this point, it is imperative to stop and ensure that the basic
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| 237 | functions (compiling and linking) of the new toolchain are working as
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| 238 | expected. To perform a sanity check, run the following commands:</para>
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| 239 |
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| 240 | <screen><userinput>echo 'int main(){}' > dummy.c
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| 241 | cc dummy.c
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| 242 | readelf -l a.out | grep ': /tools'</userinput></screen>
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| 243 |
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| 244 | <para>If everything is working correctly, there should be no errors,
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| 245 | and the output of the last command will be of the form:</para>
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| 246 |
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| 247 | <screen><computeroutput>[Requesting program interpreter: /tools/lib64/ld-linux-x86-64.so.2]</computeroutput></screen>
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| 248 |
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[8eb3fe4] | 249 |
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[ee1a413] | 250 | <para arch="ml_32,ml_all">Repeat the test for 32-bit:</para>
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[8eb3fe4] | 251 |
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[ee1a413] | 252 | <screen arch="ml_32,ml_all"><userinput>cc -m32 dummy.c
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[8eb3fe4] | 253 | readelf -l a.out | grep ': /tools'</userinput></screen>
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| 254 |
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[ee1a413] | 255 | <para arch="ml_32,ml_all">In this case, the output shoud be:</para>
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[8eb3fe4] | 256 |
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[ee1a413] | 257 | <screen arch="ml_32,ml_all"><computeroutput>[Requesting program interpreter: /tools/lib/ld-linux.so.2]</computeroutput></screen>
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[8eb3fe4] | 258 |
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[ee1a413] | 259 | <para arch="ml_x32,ml_all">Repeat the test for x32-bit:</para>
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[8eb3fe4] | 260 |
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[ee1a413] | 261 | <screen arch="ml_x32,ml_all"><userinput>cc -mx32 dummy.c
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[8eb3fe4] | 262 | readelf -l a.out | grep ': /tools'</userinput></screen>
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| 263 |
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[ee1a413] | 264 | <para arch="ml_x32,ml_all">In this case, the output shoud be:</para>
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[8eb3fe4] | 265 |
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[ee1a413] | 266 | <screen arch="ml_x32,ml_all"><computeroutput>[Requesting program interpreter: /tools/lib/ld-linux-x32.so.2]</computeroutput></screen>
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[8eb3fe4] | 267 |
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| 268 | <para arch="default">Note that the dynamic linker will be
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| 269 | /tools/lib/ld-linux.so.2 for 32-bit machines.</para>
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[1fa2099] | 270 |
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| 271 | <para>If the output is not shown as above or there was no output at all,
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| 272 | then something is wrong. Investigate and retrace the steps to find out
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| 273 | where the problem is and correct it. This issue must be resolved before
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| 274 | continuing on. First, perform the sanity check again, using
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| 275 | <command>gcc</command> instead of <command>cc</command>. If this works,
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| 276 | then the <filename class="symlink">/tools/bin/cc</filename> symlink is
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| 277 | missing. Install the symlink as per above.
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| 278 | Next, ensure that the <envar>PATH</envar> is correct. This
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| 279 | can be checked by running <command>echo $PATH</command> and verifying that
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| 280 | <filename class="directory">/tools/bin</filename> is at the head of the
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| 281 | list. If the <envar>PATH</envar> is wrong it could mean that you are not
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| 282 | logged in as user <systemitem class="username">lfs</systemitem> or that
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| 283 | something went wrong back in <xref linkend="ch-tools-settingenviron"
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| 284 | role="."/></para>
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| 285 |
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| 286 | <para>Once all is well, clean up the test files:</para>
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| 287 |
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| 288 | <screen><userinput>rm -v dummy.c a.out</userinput></screen>
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| 289 |
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| 290 | </caution>
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| 291 |
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| 292 | </sect2>
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| 293 |
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| 294 | <sect2 role="content">
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| 295 | <title/>
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| 296 |
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| 297 | <para>Details on this package are located in
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| 298 | <xref linkend="contents-gcc" role="."/></para>
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| 299 |
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| 300 | </sect2>
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| 301 |
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| 302 | </sect1>
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