[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-pass1" role="wrap" xreflabel="gcc-pass1">
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| 9 | <?dbhtml filename="gcc-pass1.html"?>
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| 10 |
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| 11 | <sect1info condition="script">
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[60970f9] | 12 | <productname>gcc-pass1</productname>
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[1fa2099] | 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 1</title>
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| 18 |
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| 19 | <indexterm zone="ch-tools-gcc-pass1">
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| 20 | <primary sortas="a-GCC">GCC</primary>
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| 21 | <secondary>tools, pass 1</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-ch5p1-sbu;</seg>
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| 37 | <seg>&gcc-ch5p1-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 Cross GCC</title>
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| 45 |
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[8eb3fe4] | 46 | <para arch="default">GCC now requires the GMP, MPFR, and MPC packages. As
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| 47 | these packages may not be included in your host distribution, they will be
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| 48 | built with GCC. Unpack each package into the GCC source directory and
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| 49 | rename the resulting directories so the GCC build procedures will
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| 50 | automatically use them:</para>
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| 51 |
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[ee1a413] | 52 | <para arch="ml_32,ml_x32,ml_all">GCC now requires the GMP, ISL, MPFR, and MPC packages.
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[8eb3fe4] | 53 | As these packages may not be included in your host distribution, they will
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| 54 | be built with GCC. Unpack each package into the GCC source directory and
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| 55 | rename the resulting directories so the GCC build procedures will
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| 56 | automatically use them:</para>
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[1fa2099] | 57 |
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| 58 | <note><para>There are frequent misunderstandings about this chapter. The
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| 59 | procedures are the same as every other chapter as explained earlier (<xref
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| 60 | linkend='buildinstr'/>). First extract the gcc tarball from the sources
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| 61 | directory and then change to the directory created. Only then should you
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| 62 | proceed with the instructions below.</para></note>
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| 63 |
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[8eb3fe4] | 64 | <screen arch="default"><userinput remap="pre">tar -xf ../mpfr-&mpfr-version;.tar.xz
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[1fa2099] | 65 | mv -v mpfr-&mpfr-version; mpfr
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| 66 | tar -xf ../gmp-&gmp-version;.tar.xz
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| 67 | mv -v gmp-&gmp-version; gmp
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| 68 | tar -xf ../mpc-&mpc-version;.tar.gz
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| 69 | mv -v mpc-&mpc-version; mpc</userinput></screen>
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[ee1a413] | 70 | <screen arch="ml_32,ml_x32,ml_all"><userinput remap="pre">tar -xf ../mpfr-&mpfr-version;.tar.xz
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[8eb3fe4] | 71 | mv -v mpfr-&mpfr-version; mpfr
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| 72 | tar -xf ../gmp-&gmp-version;.tar.xz
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| 73 | mv -v gmp-&gmp-version; gmp
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| 74 | tar -xf ../mpc-&mpc-version;.tar.gz
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| 75 | mv -v mpc-&mpc-version; mpc
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| 76 | tar -xf ../isl-&isl-version;.tar.xz
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| 77 | mv -v isl-&isl-version; isl</userinput></screen>
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[1fa2099] | 78 |
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| 79 | <para>The following command will change the location of GCC's default
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| 80 | dynamic linker to use the one installed in <filename
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| 81 | class="directory">/tools</filename>. It also removes <filename
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| 82 | class="directory">/usr/include</filename> from GCC's include search path.
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| 83 | Issue:</para>
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| 84 |
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| 85 | <screen><userinput remap="pre">for file in gcc/config/{linux,i386/linux{,64}}.h
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| 86 | do
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| 87 | cp -uv $file{,.orig}
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[8eb3fe4] | 88 | sed -e 's@/lib\(64\)\?\(32\)\?\(x32\)\?/ld@/tools&@g' \
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[1fa2099] | 89 | -e 's@/usr@/tools@g' $file.orig > $file
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| 90 | echo '
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| 91 | #undef STANDARD_STARTFILE_PREFIX_1
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| 92 | #undef STANDARD_STARTFILE_PREFIX_2
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| 93 | #define STANDARD_STARTFILE_PREFIX_1 "/tools/lib/"
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| 94 | #define STANDARD_STARTFILE_PREFIX_2 ""' >> $file
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| 95 | touch $file.orig
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| 96 | done</userinput></screen>
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| 97 |
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| 98 | <para>In case the above seems hard to follow, let's break it down a bit.
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| 99 | First we copy the files <filename>gcc/config/linux.h</filename>,
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| 100 | <filename>gcc/config/i386/linux.h</filename>, and
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| 101 | <filename>gcc/config/i368/linux64.h</filename> to a file of
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| 102 | the same name but with an added suffix of <quote>.orig</quote>. Then the
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| 103 | first sed expression prepends <quote>/tools</quote> to every instance of
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| 104 | <quote>/lib/ld</quote>, <quote>/lib64/ld</quote> or
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| 105 | <quote>/lib32/ld</quote>, while the second one replaces hard-coded
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| 106 | instances of <quote>/usr</quote>. Next, we add our define statements which
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| 107 | alter the default startfile prefix to the end of the file. Note that the
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| 108 | trailing <quote>/</quote> in <quote>/tools/lib/</quote> is required.
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| 109 | Finally, we use <command>touch</command> to update the timestamp on the
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| 110 | copied files. When used in conjunction with <command>cp -u</command>, this
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| 111 | prevents unexpected changes to the original files in case the commands are
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| 112 | inadvertently run twice.</para>
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| 113 |
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[8eb3fe4] | 114 | <para arch="default">Finally, on x86_64 hosts, set the default directory
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| 115 | name for 64-bit libraries to <quote>lib</quote>:</para>
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[1fa2099] | 116 |
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[8eb3fe4] | 117 | <screen arch="default"><userinput remap="pre">case $(uname -m) in
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[1fa2099] | 118 | x86_64)
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| 119 | sed -e '/m64=/s/lib64/lib/' \
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| 120 | -i.orig gcc/config/i386/t-linux64
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| 121 | ;;
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| 122 | esac</userinput></screen>
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| 123 |
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[058c7ef] | 124 | <screen arch="ml_32,ml_x32,ml_all"><userinput remap="pre">sed -e '/m64=/s/lib64/lib/' \
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| 125 | -e '/m32=/s/m32=.*/m32=..\/lib32$(call if_multiarch,:i386-linux-gnu)/' \
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| 126 | -i.orig gcc/config/i386/t-linux64</userinput></screen>
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[8eb3fe4] | 127 |
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[1fa2099] | 128 | <!--
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| 129 | <para>GCC doesn't detect stack protection correctly, which causes problems
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| 130 | for the build of Glibc-&glibc-version;, so fix that by issuing the following
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| 131 | command:</para>
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| 132 |
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| 133 | <screen><userinput remap="pre">sed -i '/k prot/agcc_cv_libc_provides_ssp=yes' gcc/configure</userinput></screen>
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| 134 | -->
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| 135 |
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| 136 | <!--
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| 137 | <para>Also fix a problem identified upstream:</para>
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| 138 |
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| 139 | <screen><userinput remap="pre">sed -i 's/if \((code.*))\)/if (\1 \&\& \!DEBUG_INSN_P (insn))/' gcc/sched-deps.c</userinput></screen>
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| 140 | -->
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[8eb3fe4] | 141 |
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| 142 | <!-- Following patch might be obsolete with gcc >= 8.2.1 -->
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| 143 | <!-- see: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86724 -->
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| 144 | <!-- Fix applied in ch5-gcc-pass{1,2}, ch6-gcc -->
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[ee1a413] | 145 | <para arch="ml_32,ml_x32,ml_all">Fix an issue with isl-&isl-version;:</para>
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[8eb3fe4] | 146 |
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[ee1a413] | 147 | <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] | 148 | -i gcc/graphite.h</userinput></screen>
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| 149 |
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[1fa2099] | 150 | <para>The GCC documentation recommends building GCC
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| 151 | in a dedicated build directory:</para>
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| 152 |
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| 153 | <screen><userinput remap="pre">mkdir -v build
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| 154 | cd build</userinput></screen>
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| 155 |
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| 156 | <para>Prepare GCC for compilation:</para>
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| 157 |
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[8eb3fe4] | 158 | <screen arch="default"><userinput remap="configure">../configure \
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[1fa2099] | 159 | --target=$LFS_TGT \
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| 160 | --prefix=/tools \
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| 161 | --with-glibc-version=2.11 \
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| 162 | --with-sysroot=$LFS \
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| 163 | --with-newlib \
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| 164 | --without-headers \
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| 165 | --with-local-prefix=/tools \
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| 166 | --with-native-system-header-dir=/tools/include \
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| 167 | --disable-nls \
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| 168 | --disable-shared \
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| 169 | --disable-multilib \
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| 170 | --disable-decimal-float \
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| 171 | --disable-threads \
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| 172 | --disable-libatomic \
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| 173 | --disable-libgomp \
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| 174 | --disable-libmpx \
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| 175 | --disable-libquadmath \
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| 176 | --disable-libssp \
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| 177 | --disable-libvtv \
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| 178 | --disable-libstdcxx \
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| 179 | --enable-languages=c,c++</userinput></screen>
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[8eb3fe4] | 180 |
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[ee1a413] | 181 | <screen arch="ml_32,ml_x32,ml_all"><userinput remap="configure">mlist="m64"</userinput>
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| 182 | <userinput arch="ml_32,ml_all" remap="configure">mlist="$mlist,m32"</userinput>
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| 183 | <userinput arch="ml_x32,ml_all" remap="configure">mlist="$mlist,mx32"</userinput>
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| 184 | <userinput remap="configure">../configure \
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[8eb3fe4] | 185 | --target=$LFS_TGT \
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| 186 | --prefix=/tools \
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| 187 | --with-glibc-version=2.11 \
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| 188 | --with-sysroot=$LFS \
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| 189 | --with-newlib \
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| 190 | --without-headers \
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| 191 | --with-local-prefix=/tools \
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| 192 | --with-native-system-header-dir=/tools/include \
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| 193 | --disable-nls \
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| 194 | --disable-shared \
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| 195 | --enable-multilib \
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[ee1a413] | 196 | --with-multilib-list=$mlist \
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[8eb3fe4] | 197 | --disable-decimal-float \
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| 198 | --disable-threads \
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| 199 | --disable-libatomic \
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| 200 | --disable-libgomp \
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| 201 | --disable-libmpx \
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| 202 | --disable-libquadmath \
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| 203 | --disable-libssp \
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| 204 | --disable-libvtv \
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| 205 | --disable-libstdcxx \
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| 206 | --enable-languages=c,c++</userinput></screen>
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| 207 |
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[1fa2099] | 208 | <variablelist>
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| 209 | <title>The meaning of the configure options:</title>
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| 210 |
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| 211 | <varlistentry>
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| 212 | <term><parameter>--with-newlib</parameter></term>
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| 213 | <listitem>
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| 214 | <para>Since a working C library is not yet available, this ensures
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| 215 | that the inhibit_libc constant is defined when building libgcc. This prevents
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| 216 | the compiling of any code that requires libc support.</para>
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| 217 | </listitem>
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| 218 | </varlistentry>
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| 219 |
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| 220 | <varlistentry>
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| 221 | <term><parameter>--without-headers</parameter></term>
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| 222 | <listitem>
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| 223 | <para>When creating a complete cross-compiler, GCC requires
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| 224 | standard headers compatible with the target system. For our
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| 225 | purposes these headers will not be needed. This switch prevents
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| 226 | GCC from looking for them.</para>
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| 227 | </listitem>
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| 228 | </varlistentry>
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| 229 |
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| 230 | <varlistentry>
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| 231 | <term><parameter>--with-local-prefix=/tools</parameter></term>
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| 232 | <listitem>
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| 233 | <para>The local prefix is the location in the system that GCC will search
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| 234 | for locally installed include files. The default is <filename>/usr/local</filename>.
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| 235 | Setting this to <filename>/tools</filename> helps keep the host location of
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| 236 | <filename>/usr/local</filename> out of this GCC's search path.</para>
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| 237 | </listitem>
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| 238 | </varlistentry>
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| 239 |
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| 240 | <varlistentry>
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| 241 | <term><parameter>--with-native-system-header-dir=/tools/include</parameter></term>
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| 242 | <listitem>
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| 243 | <para>By default GCC searches <filename>/usr/include</filename> for
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| 244 | system headers. In conjunction with the sysroot switch, this would
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| 245 | normally translate to <filename>$LFS/usr/include</filename>. However
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| 246 | the headers that will be installed in the next two sections will go
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| 247 | to <filename>$LFS/tools/include</filename>. This switch ensures that
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| 248 | gcc will find them correctly. In the second pass of GCC, this same
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| 249 | switch will ensure that no headers from the host system are
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| 250 | found.</para>
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| 251 | </listitem>
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| 252 | </varlistentry>
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| 253 |
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| 254 | <varlistentry>
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| 255 | <term><parameter>--disable-shared</parameter></term>
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| 256 | <listitem>
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| 257 | <para>This switch forces GCC to link its internal libraries
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| 258 | statically. We do this to avoid possible issues with the host
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| 259 | system.</para>
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| 260 | </listitem>
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| 261 | </varlistentry>
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| 262 |
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| 263 | <varlistentry>
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| 264 | <term><parameter>--disable-decimal-float, --disable-threads,
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| 265 | --disable-libatomic, --disable-libgomp, --disable-libmpx,
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| 266 | --disable-libquadmath, --disable-libssp, --disable-libvtv,
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| 267 | --disable-libstdcxx</parameter></term>
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| 268 | <listitem>
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| 269 | <para>These switches disable support for the decimal floating point
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| 270 | extension, threading, libatomic, libgomp, libmpx, libquadmath, libssp,
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| 271 | libvtv, and the C++ standard library respectively. These features
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| 272 | will fail to compile when building a cross-compiler and are not
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| 273 | necessary for the task of cross-compiling the temporary libc.</para>
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| 274 | </listitem>
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| 275 | </varlistentry>
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| 276 |
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[8eb3fe4] | 277 | <varlistentry arch="default">
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[1fa2099] | 278 | <term><parameter>--disable-multilib</parameter></term>
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| 279 | <listitem>
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| 280 | <para>On x86_64, LFS does not yet support a multilib configuration.
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| 281 | This switch is harmless for x86.</para>
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| 282 | </listitem>
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| 283 | </varlistentry>
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| 284 |
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[ee1a413] | 285 | <varlistentry arch="ml_32,ml_x32,ml_all">
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[8eb3fe4] | 286 | <term><parameter>--enable-multilib,
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| 287 | --with-multilib-list=m32,m64,mx32</parameter></term>
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| 288 | <listitem>
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| 289 | <para>LFS now supports a multilib configuration. Enable it for the
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| 290 | 32bit, the 64-bit, and the mixed mode.</para>
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| 291 | </listitem>
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| 292 | </varlistentry>
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| 293 |
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[1fa2099] | 294 | <varlistentry>
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| 295 | <term><parameter>--enable-languages=c,c++</parameter></term>
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| 296 | <listitem>
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| 297 | <para>This option ensures that only the C and C++ compilers are built.
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| 298 | These are the only languages needed now.</para>
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| 299 | </listitem>
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| 300 | </varlistentry>
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| 301 |
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| 302 | </variablelist>
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| 303 |
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| 304 | <para>Compile GCC by running:</para>
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| 305 |
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| 306 | <screen><userinput remap="make">make</userinput></screen>
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| 307 |
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| 308 | <para>Compilation is now complete. At this point, the test suite would
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| 309 | normally be run, but, as mentioned before, the test suite framework is
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| 310 | not in place yet. The benefits of running the tests at this point
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| 311 | are minimal since the programs from this first pass will soon be
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| 312 | replaced.</para>
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| 313 |
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| 314 | <para>Install the package:</para>
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| 315 |
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| 316 | <screen><userinput remap="install">make install</userinput></screen>
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| 317 | <!--
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| 318 | <para>Using <parameter>- -disable-shared</parameter> means that the
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| 319 | <filename>libgcc_eh.a</filename> file isn't created and installed. The
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| 320 | Glibc package depends on this library as it uses
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| 321 | <parameter>-lgcc_eh</parameter> within its build system. This dependency
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| 322 | can be satisfied by creating a symlink to <filename>libgcc.a</filename>,
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| 323 | since that file will end up containing the objects normally contained in
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| 324 | <filename>libgcc_eh.a</filename>:</para>
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| 325 |
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| 326 | <screen><userinput remap="install">ln -sv libgcc.a `$LFS_TGT-gcc -print-libgcc-file-name | sed 's/libgcc/&_eh/'`</userinput></screen>
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| 327 | -->
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| 328 | </sect2>
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| 329 |
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| 330 | <sect2 role="content">
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| 331 | <title/>
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| 332 |
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| 333 | <para>Details on this package are located in
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| 334 | <xref linkend="contents-gcc" role="."/></para>
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| 335 |
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| 336 | </sect2>
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| 337 |
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| 338 | </sect1>
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