| 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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| 12 | <productname>gcc-pass1</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 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="../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-tmpp1-sbu;</seg>
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| 37 | <seg>&gcc-tmpp1-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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| 46 | <para>GCC requires the GMP, MPFR and MPC packages. As these packages may
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| 47 | not be included in your host distribution, they will be built with
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| 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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| 51 |
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| 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-&gcc-version; 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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| 58 | <screen><userinput remap="pre">tar -xf ../mpfr-&mpfr-version;.tar.xz
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| 59 | mv -v mpfr-&mpfr-version; mpfr
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| 60 | tar -xf ../gmp-&gmp-version;.tar.xz
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| 61 | mv -v gmp-&gmp-version; gmp
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| 62 | tar -xf ../mpc-&mpc-version;.tar.gz
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| 63 | mv -v mpc-&mpc-version; mpc</userinput></screen>
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| 64 |
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| 65 | <para>For x86_64 target, set the default directory name for
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| 66 | 64-bit libraries to <quote>lib</quote>. The command is unnecessary,
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| 67 | but harmless for 32-bit x86. If you are building for another target,
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| 68 | you may need to adjust the command for your target.</para>
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| 69 |
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| 70 | <screen><userinput remap="pre">sed -e '/m64=/s/lib64/lib/' \
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| 71 | -i.orig gcc/config/i386/t-linux64</userinput></screen>
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| 72 |
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| 73 | <para>The GCC documentation recommends building GCC
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| 74 | in a dedicated build directory:</para>
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| 75 |
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| 76 | <screen><userinput remap="pre">mkdir -v build
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| 77 | cd build</userinput></screen>
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| 78 |
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| 79 | <para>Prepare GCC for compilation:</para>
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| 80 |
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| 81 | <screen><userinput remap="configure">../configure \
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| 82 | --target=$LFS_TGT \
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| 83 | --prefix=$LFS/tools \
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| 84 | --with-glibc-version=&glibc-version; \
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| 85 | --with-sysroot=$LFS \
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| 86 | --with-newlib \
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| 87 | --without-headers \
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| 88 | --enable-default-pie \
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| 89 | --enable-default-ssp \
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| 90 | --disable-nls \
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| 91 | --disable-shared \
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| 92 | --disable-multilib \
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| 93 | --disable-threads \
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| 94 | --disable-libatomic \
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| 95 | --disable-libgomp \
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| 96 | --disable-libquadmath \
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| 97 | --disable-libssp \
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| 98 | --disable-libvtv \
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| 99 | --disable-libstdcxx \
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| 100 | --enable-languages=c,c++</userinput></screen>
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| 101 | <variablelist>
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| 102 | <title>The meaning of the configure options:</title>
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| 103 |
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| 104 | <varlistentry>
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| 105 | <term><parameter>--with-glibc-version=&glibc-version;</parameter></term>
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| 106 | <listitem>
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| 107 | <para>This option specifies the version of Glibc which will be
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| 108 | used on the target. It is not relevant to the libc of the host
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| 109 | distro because everything compiled by pass1 GCC will run in the
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| 110 | chroot environment, which is isolated from libc of the host
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| 111 | distro.</para>
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| 112 | </listitem>
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| 113 | </varlistentry>
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| 114 |
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| 115 | <varlistentry>
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| 116 | <term><parameter>--with-newlib</parameter></term>
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| 117 | <listitem>
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| 118 | <para>Since a working C library is not yet available, this ensures
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| 119 | that the inhibit_libc constant is defined when building libgcc. This prevents
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| 120 | the compiling of any code that requires libc support.</para>
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| 121 | </listitem>
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| 122 | </varlistentry>
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| 123 |
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| 124 | <varlistentry>
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| 125 | <term><parameter>--without-headers</parameter></term>
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| 126 | <listitem>
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| 127 | <para>When creating a complete cross-compiler, GCC requires
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| 128 | standard headers compatible with the target system. For our
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| 129 | purposes these headers will not be needed. This switch prevents
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| 130 | GCC from looking for them.</para>
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| 131 | </listitem>
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| 132 | </varlistentry>
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| 133 |
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| 134 | <varlistentry>
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| 135 | <term><parameter>--enable-default-pie and
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| 136 | --enable-default-ssp</parameter></term>
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| 137 | <listitem>
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| 138 | <para>Those switches allow GCC to compile programs with
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| 139 | some hardening security features (more information on those in
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| 140 | the <xref linkend="pie-ssp-info"/> in chapter 8) by default. The
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| 141 | are not strictly needed at this stage, since the compiler will
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| 142 | only produce temporary executables. But it is cleaner to have the
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| 143 | temporary packages be as close as possible to the final ones.
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| 144 | </para>
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| 145 | </listitem>
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| 146 | </varlistentry>
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| 147 |
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| 148 | <varlistentry>
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| 149 | <term><parameter>--disable-shared</parameter></term>
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| 150 | <listitem>
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| 151 | <para>This switch forces GCC to link its internal libraries
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| 152 | statically. We need this because the shared libraries require Glibc,
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| 153 | which is not yet installed on the target system.</para>
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| 154 | </listitem>
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| 155 | </varlistentry>
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| 156 |
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| 157 | <varlistentry>
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| 158 | <term><parameter>--disable-multilib</parameter></term>
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| 159 | <listitem>
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| 160 | <para>On x86_64, LFS does not support a multilib configuration.
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| 161 | This switch is harmless for x86.</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>--disable-decimal-float, --disable-threads,
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| 167 | --disable-libatomic, --disable-libgomp,
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| 168 | --disable-libquadmath, --disable-libssp, --disable-libvtv,
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| 169 | --disable-libstdcxx</parameter></term>
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| 170 | <listitem>
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| 171 | <para>These switches disable support for the decimal floating point
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| 172 | extension, threading, libatomic, libgomp, libquadmath, libssp,
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| 173 | libvtv, and the C++ standard library respectively. These features
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| 174 | will fail to compile when building a cross-compiler and are not
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| 175 | necessary for the task of cross-compiling the temporary libc.</para>
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| 176 | </listitem>
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| 177 | </varlistentry>
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| 178 |
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| 179 | <varlistentry>
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| 180 | <term><parameter>--enable-languages=c,c++</parameter></term>
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| 181 | <listitem>
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| 182 | <para>This option ensures that only the C and C++ compilers are built.
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| 183 | These are the only languages needed now.</para>
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| 184 | </listitem>
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| 185 | </varlistentry>
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| 186 |
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| 187 | </variablelist>
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| 188 |
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| 189 | <para>Compile GCC by running:</para>
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| 190 |
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| 191 | <screen><userinput remap="make">make</userinput></screen>
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| 192 |
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| 193 | <para>Install the package:</para>
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| 194 |
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| 195 | <screen><userinput remap="install">make install</userinput></screen>
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| 196 |
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| 197 | <para>This build of GCC has installed a couple of internal system
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| 198 | headers. Normally one of them, <filename>limits.h</filename>, would in turn
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| 199 | include the corresponding system <filename>limits.h</filename> header, in
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| 200 | this case, <filename>$LFS/usr/include/limits.h</filename>. However, at the
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| 201 | time of this build of GCC <filename>$LFS/usr/include/limits.h</filename>
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| 202 | does not exist, so the internal header that has just been installed is a
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| 203 | partial, self-contained file and does not include the extended features of
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| 204 | the system header. This is adequate for building Glibc, but the full
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| 205 | internal header will be needed later. Create a full version of the internal
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| 206 | header using a command that is identical to what the GCC build system does
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| 207 | in normal circumstances:</para>
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| 208 |
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| 209 | <screen><userinput remap="install">cd ..
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| 210 | cat gcc/limitx.h gcc/glimits.h gcc/limity.h > \
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| 211 | `dirname $($LFS_TGT-gcc -print-libgcc-file-name)`/install-tools/include/limits.h</userinput></screen>
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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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