[673b0d8] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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[b06ca36] | 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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[673b0d8] | 4 | <!ENTITY % general-entities SYSTEM "../general.ent">
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| 5 | %general-entities;
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| 6 | ]>
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[1f7ca93] | 7 |
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[1067bac] | 8 | <sect1 id="ch-tools-gcc-pass1" role="wrap" xreflabel="gcc-pass1">
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[1f7ca93] | 9 | <?dbhtml filename="gcc-pass1.html"?>
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| 10 |
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[e747759] | 11 | <sect1info condition="script">
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[6070f51] | 12 | <productname>gcc-pass1</productname>
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[e747759] | 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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[1f7ca93] | 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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[bc82645e] | 26 |
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[d9441360] | 27 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
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[1f7ca93] | 28 | href="../chapter06/gcc.xml"
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| 29 | xpointer="xpointer(/sect1/sect2[1]/para[1])"/>
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[81fd230] | 30 |
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[1f7ca93] | 31 | <segmentedlist>
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| 32 | <segtitle>&buildtime;</segtitle>
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| 33 | <segtitle>&diskspace;</segtitle>
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[5888299] | 34 |
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[1f7ca93] | 35 | <seglistitem>
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[e4a5635] | 36 | <seg>&gcc-ch5p1-sbu;</seg>
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| 37 | <seg>&gcc-ch5p1-du;</seg>
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[1f7ca93] | 38 | </seglistitem>
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| 39 | </segmentedlist>
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[673b0d8] | 40 |
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[1f7ca93] | 41 | </sect2>
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[73aedd1d] | 42 |
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[1f7ca93] | 43 | <sect2 role="installation">
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[4e82d47] | 44 | <title>Installation of Cross GCC</title>
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[73aedd1d] | 45 |
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[4916842] | 46 | <para>GCC now requires the GMP, MPFR and MPC packages. As these packages may
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[6cc0516] | 47 | not be included in your host distribution, they will be built with
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[95c681a] | 48 | GCC. Unpack each package into the GCC source directory and rename the
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| 49 | resulting directories so the GCC build procedures will automatically
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| 50 | use them:</para>
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[6cc0516] | 51 |
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[3380af3] | 52 | <note><para>There are frequent misunderstandings about this chapter. The
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| 53 | procedures are the same as every other chapter as explained earlier (<xref
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| 54 | linkend='buildinstr'/>). First extract the gcc tarball from the sources
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| 55 | directory and then change to the directory created. Only then should you
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| 56 | proceed with the instructions below.</para></note>
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| 57 |
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[ee648fd] | 58 | <screen><userinput remap="pre">tar -xf ../mpfr-&mpfr-version;.tar.xz
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[e311865] | 59 | mv -v mpfr-&mpfr-version; mpfr
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[ee648fd] | 60 | tar -xf ../gmp-&gmp-version;.tar.xz
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[b2f3f15] | 61 | mv -v gmp-&gmp-version; gmp
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[ee648fd] | 62 | tar -xf ../mpc-&mpc-version;.tar.gz
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[4916842] | 63 | mv -v mpc-&mpc-version; mpc</userinput></screen>
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[6cc0516] | 64 |
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[1a3e6a3] | 65 | <para>The following command will change the location of GCC's default
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| 66 | dynamic linker to use the one installed in <filename
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| 67 | class="directory">/tools</filename>. It also removes <filename
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| 68 | class="directory">/usr/include</filename> from GCC's include search path.
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| 69 | Issue:</para>
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| 70 |
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[be3d9f3] | 71 | <screen><userinput remap="pre">for file in gcc/config/{linux,i386/linux{,64}}.h
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[1a3e6a3] | 72 | do
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| 73 | cp -uv $file{,.orig}
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| 74 | sed -e 's@/lib\(64\)\?\(32\)\?/ld@/tools&@g' \
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| 75 | -e 's@/usr@/tools@g' $file.orig > $file
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| 76 | echo '
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| 77 | #undef STANDARD_STARTFILE_PREFIX_1
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| 78 | #undef STANDARD_STARTFILE_PREFIX_2
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| 79 | #define STANDARD_STARTFILE_PREFIX_1 "/tools/lib/"
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| 80 | #define STANDARD_STARTFILE_PREFIX_2 ""' >> $file
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| 81 | touch $file.orig
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| 82 | done</userinput></screen>
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| 83 |
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| 84 | <para>In case the above seems hard to follow, let's break it down a bit.
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[a05450f] | 85 | First we copy the files <filename>gcc/config/linux.h</filename>,
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| 86 | <filename>gcc/config/i386/linux.h</filename>, and
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[0d84af1] | 87 | <filename>gcc/config/i368/linux64.h</filename> to a file of
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[1a3e6a3] | 88 | the same name but with an added suffix of <quote>.orig</quote>. Then the
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| 89 | first sed expression prepends <quote>/tools</quote> to every instance of
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| 90 | <quote>/lib/ld</quote>, <quote>/lib64/ld</quote> or
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| 91 | <quote>/lib32/ld</quote>, while the second one replaces hard-coded
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| 92 | instances of <quote>/usr</quote>. Next, we add our define statements which
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| 93 | alter the default startfile prefix to the end of the file. Note that the
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| 94 | trailing <quote>/</quote> in <quote>/tools/lib/</quote> is required.
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| 95 | Finally, we use <command>touch</command> to update the timestamp on the
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| 96 | copied files. When used in conjunction with <command>cp -u</command>, this
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| 97 | prevents unexpected changes to the original files in case the commands are
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[be3d9f3] | 98 | inadvertently run twice.</para>
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| 99 |
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| 100 | <para>Finally, on x86_64 hosts, set the default directory name for
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| 101 | 64-bit libraries to <quote>lib</quote>:</para>
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| 102 |
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| 103 | <screen><userinput remap="pre">case $(uname -m) in
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| 104 | x86_64)
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| 105 | sed -e '/m64=/s/lib64/lib/' \
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| 106 | -i.orig gcc/config/i386/t-linux64
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| 107 | ;;
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| 108 | esac</userinput></screen>
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| 109 |
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[5f28def] | 110 | <!--
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[f1c177f] | 111 | <para>GCC doesn't detect stack protection correctly, which causes problems
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| 112 | for the build of Glibc-&glibc-version;, so fix that by issuing the following
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| 113 | command:</para>
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| 114 |
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| 115 | <screen><userinput remap="pre">sed -i '/k prot/agcc_cv_libc_provides_ssp=yes' gcc/configure</userinput></screen>
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[5f28def] | 116 | -->
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| 117 |
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[238d351] | 118 | <!--
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[8a8177f9] | 119 | <para>Also fix a problem identified upstream:</para>
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| 120 |
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| 121 | <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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[238d351] | 122 | -->
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[f1dd547] | 123 | <para>The GCC documentation recommends building GCC
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| 124 | in a dedicated build directory:</para>
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[3d36131c] | 125 |
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[f1dd547] | 126 | <screen><userinput remap="pre">mkdir -v build
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| 127 | cd build</userinput></screen>
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[73aedd1d] | 128 |
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[1f7ca93] | 129 | <para>Prepare GCC for compilation:</para>
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[73aedd1d] | 130 |
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[f1dd547] | 131 | <screen><userinput remap="configure">../configure \
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[d0da965a] | 132 | --target=$LFS_TGT \
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| 133 | --prefix=/tools \
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| 134 | --with-glibc-version=2.11 \
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| 135 | --with-sysroot=$LFS \
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| 136 | --with-newlib \
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| 137 | --without-headers \
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| 138 | --with-local-prefix=/tools \
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| 139 | --with-native-system-header-dir=/tools/include \
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| 140 | --disable-nls \
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| 141 | --disable-shared \
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| 142 | --disable-multilib \
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| 143 | --disable-decimal-float \
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| 144 | --disable-threads \
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| 145 | --disable-libatomic \
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| 146 | --disable-libgomp \
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[42130d6] | 147 | --disable-libmpx \
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[d0da965a] | 148 | --disable-libquadmath \
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| 149 | --disable-libssp \
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| 150 | --disable-libvtv \
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[05a0344] | 151 | --disable-libstdcxx \
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[8aa7fde] | 152 | --enable-languages=c,c++</userinput></screen>
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[1f7ca93] | 153 | <variablelist>
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| 154 | <title>The meaning of the configure options:</title>
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| 155 |
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[1a3e6a3] | 156 | <varlistentry>
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| 157 | <term><parameter>--with-newlib</parameter></term>
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| 158 | <listitem>
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| 159 | <para>Since a working C library is not yet available, this ensures
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| 160 | that the inhibit_libc constant is defined when building libgcc. This prevents
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| 161 | the compiling of any code that requires libc support.</para>
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| 162 | </listitem>
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| 163 | </varlistentry>
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| 164 |
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| 165 | <varlistentry>
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| 166 | <term><parameter>--without-headers</parameter></term>
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| 167 | <listitem>
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| 168 | <para>When creating a complete cross-compiler, GCC requires
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| 169 | standard headers compatible with the target system. For our
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| 170 | purposes these headers will not be needed. This switch prevents
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| 171 | GCC from looking for them.</para>
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| 172 | </listitem>
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| 173 | </varlistentry>
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| 174 |
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| 175 | <varlistentry>
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| 176 | <term><parameter>--with-local-prefix=/tools</parameter></term>
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| 177 | <listitem>
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| 178 | <para>The local prefix is the location in the system that GCC will search
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| 179 | for locally installed include files. The default is <filename>/usr/local</filename>.
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| 180 | Setting this to <filename>/tools</filename> helps keep the host location of
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| 181 | <filename>/usr/local</filename> out of this GCC's search path.</para>
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| 182 | </listitem>
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| 183 | </varlistentry>
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| 184 |
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| 185 | <varlistentry>
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| 186 | <term><parameter>--with-native-system-header-dir=/tools/include</parameter></term>
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| 187 | <listitem>
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[0d84af1] | 188 | <para>By default GCC searches <filename>/usr/include</filename> for
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| 189 | system headers. In conjunction with the sysroot switch, this would
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| 190 | normally translate to <filename>$LFS/usr/include</filename>. However
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| 191 | the headers that will be installed in the next two sections will go
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| 192 | to <filename>$LFS/tools/include</filename>. This switch ensures that
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| 193 | gcc will find them correctly. In the second pass of GCC, this same
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| 194 | switch will ensure that no headers from the host system are
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| 195 | found.</para>
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[1a3e6a3] | 196 | </listitem>
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| 197 | </varlistentry>
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| 198 |
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[1f7ca93] | 199 | <varlistentry>
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[0eb90658] | 200 | <term><parameter>--disable-shared</parameter></term>
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[1f7ca93] | 201 | <listitem>
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[c49647b1] | 202 | <para>This switch forces GCC to link its internal libraries
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[0eb90658] | 203 | statically. We do this to avoid possible issues with the host
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| 204 | system.</para>
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[1f7ca93] | 205 | </listitem>
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| 206 | </varlistentry>
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| 207 |
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[182d5d3] | 208 | <varlistentry>
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[908077d] | 209 | <term><parameter>--disable-decimal-float, --disable-threads,
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[1118b17] | 210 | --disable-libatomic, --disable-libgomp, --disable-libmpx,
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[42130d6] | 211 | --disable-libquadmath, --disable-libssp, --disable-libvtv,
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| 212 | --disable-libstdcxx</parameter></term>
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[182d5d3] | 213 | <listitem>
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[8aad4385] | 214 | <para>These switches disable support for the decimal floating point
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[42130d6] | 215 | extension, threading, libatomic, libgomp, libmpx, libquadmath, libssp,
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[05a0344] | 216 | libvtv, and the C++ standard library respectively. These features
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| 217 | will fail to compile when building a cross-compiler and are not
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| 218 | necessary for the task of cross-compiling the temporary libc.</para>
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[182d5d3] | 219 | </listitem>
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| 220 | </varlistentry>
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| 221 |
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[1f7ca93] | 222 | <varlistentry>
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[4e82d47] | 223 | <term><parameter>--disable-multilib</parameter></term>
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[1f7ca93] | 224 | <listitem>
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[4e82d47] | 225 | <para>On x86_64, LFS does not yet support a multilib configuration.
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| 226 | This switch is harmless for x86.</para>
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[1f7ca93] | 227 | </listitem>
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| 228 | </varlistentry>
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| 229 |
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[6e88633] | 230 | <varlistentry>
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[908077d] | 231 | <term><parameter>--enable-languages=c,c++</parameter></term>
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[6e88633] | 232 | <listitem>
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[908077d] | 233 | <para>This option ensures that only the C and C++ compilers are built.
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| 234 | These are the only languages needed now.</para>
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[6e88633] | 235 | </listitem>
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| 236 | </varlistentry>
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| 237 |
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[1f7ca93] | 238 | </variablelist>
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| 239 |
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[4e82d47] | 240 | <para>Compile GCC by running:</para>
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[b0a4c9a] | 241 |
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[0445a3d] | 242 | <screen><userinput remap="make">make</userinput></screen>
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[81fd230] | 243 |
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[1f7ca93] | 244 | <para>Compilation is now complete. At this point, the test suite would
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| 245 | normally be run, but, as mentioned before, the test suite framework is
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| 246 | not in place yet. The benefits of running the tests at this point
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| 247 | are minimal since the programs from this first pass will soon be
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| 248 | replaced.</para>
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| 249 |
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| 250 | <para>Install the package:</para>
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[73aedd1d] | 251 |
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[0445a3d] | 252 | <screen><userinput remap="install">make install</userinput></screen>
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[e079f16] | 253 | <!--
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| 254 | <para>Using <parameter>- -disable-shared</parameter> means that the
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[0eb90658] | 255 | <filename>libgcc_eh.a</filename> file isn't created and installed. The
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| 256 | Glibc package depends on this library as it uses
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[4e82d47] | 257 | <parameter>-lgcc_eh</parameter> within its build system. This dependency
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| 258 | can be satisfied by creating a symlink to <filename>libgcc.a</filename>,
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[0eb90658] | 259 | since that file will end up containing the objects normally contained in
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[5f7456b] | 260 | <filename>libgcc_eh.a</filename>:</para>
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[0eb90658] | 261 |
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[5cef314] | 262 | <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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[e079f16] | 263 | -->
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[1f7ca93] | 264 | </sect2>
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[bc82645e] | 265 |
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[1f7ca93] | 266 | <sect2 role="content">
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| 267 | <title/>
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[81fd230] | 268 |
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[1f7ca93] | 269 | <para>Details on this package are located in
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| 270 | <xref linkend="contents-gcc" role="."/></para>
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[81fd230] | 271 |
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[1f7ca93] | 272 | </sect2>
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| 273 |
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| 274 | </sect1>
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