[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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[9652249] | 8 | <sect1 id="ch-tools-gcc-pass1" role="wrap">
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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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| 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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[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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[1f7ca93] | 27 | <xi:include xmlns:xi="http://www.w3.org/2003/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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[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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| 44 | <title>Installation of GCC</title>
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[73aedd1d] | 45 |
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[6cc0516] | 46 | <para>GCC now requires the GMP and MPFR 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.</para>
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| 49 |
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| 50 | <screen><userinput remap="pre">tar -jxf ../mpfr/&mpfr-version;.tar.bz2 &&
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| 51 | mv mpfr-&mpfr-version; mpfr &&
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| 52 | tar -jxf ../gmp-&gmp-version;.tar.bz2 &&
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| 53 | mv gmp-&gmp-version; gmp</userinput></screen>
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| 54 |
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[1f7ca93] | 55 | <para>The GCC documentation recommends building GCC outside of the
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| 56 | source directory in a dedicated build directory:</para>
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[3d36131c] | 57 |
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[0445a3d] | 58 | <screen><userinput remap="pre">mkdir -v ../gcc-build
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[73aedd1d] | 59 | cd ../gcc-build</userinput></screen>
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| 60 |
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[1f7ca93] | 61 | <para>Prepare GCC for compilation:</para>
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[73aedd1d] | 62 |
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[0445a3d] | 63 | <screen><userinput remap="configure">CC="gcc -B/usr/bin/" ../gcc-&gcc-version;/configure --prefix=/tools \
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[f684ec6c] | 64 | --with-local-prefix=/tools --disable-nls --enable-shared \
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[6cc0516] | 65 | --enable-languages=c --disable-decimal-float</userinput></screen>
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[81fd230] | 66 |
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[1f7ca93] | 67 | <variablelist>
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| 68 | <title>The meaning of the configure options:</title>
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| 69 |
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[acec478] | 70 | <varlistentry>
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| 71 | <term><envar>CC="gcc -B/usr/bin/"</envar></term>
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| 72 | <listitem>
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| 73 | <para>This forces <command>gcc</command> to prefer the linker from
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| 74 | the host in <filename class="directory">/usr/bin</filename>. This
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| 75 | is necessary on some hosts where the new <command>ld</command>
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| 76 | built in the previous section is not compatible with the host's
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| 77 | <command>gcc</command>.</para>
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| 78 | </listitem>
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| 79 | </varlistentry>
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| 80 |
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[1f7ca93] | 81 | <varlistentry>
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| 82 | <term><parameter>--with-local-prefix=/tools</parameter></term>
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| 83 | <listitem>
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| 84 | <para>The purpose of this switch is to remove <filename
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| 85 | class="directory">/usr/local/include</filename> from
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| 86 | <command>gcc</command>'s include search path. This is not
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| 87 | absolutely essential, however, it helps to minimize the
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| 88 | influence of the host system.</para>
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| 89 | </listitem>
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| 90 | </varlistentry>
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| 91 |
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| 92 | <varlistentry>
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| 93 | <term><parameter>--enable-shared</parameter></term>
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| 94 | <listitem>
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| 95 | <para>This switch allows the building of <filename
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| 96 | class="libraryfile">libgcc_s.so.1</filename> and
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| 97 | <filename class="libraryfile">libgcc_eh.a</filename>.
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| 98 | Having <filename class="libraryfile">libgcc_eh.a</filename>
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| 99 | available ensures that the configure script for Glibc (the
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| 100 | next package we compile) produces the proper results.</para>
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| 101 | </listitem>
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| 102 | </varlistentry>
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| 103 |
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| 104 | <varlistentry>
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| 105 | <term><parameter>--enable-languages=c</parameter></term>
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| 106 | <listitem>
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| 107 | <para>This option ensures that only the C compiler is built.</para>
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| 108 | </listitem>
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| 109 | </varlistentry>
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| 110 |
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| 111 | </variablelist>
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| 112 |
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[b0a4c9a] | 113 | <para>The following command will compile GCC not once, but several times. It
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| 114 | uses the programs compiled in a first round to compile itself a second time,
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| 115 | and then again a third time. It then compares these second and third compiles
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| 116 | to make sure it can reproduce itself flawlessly. This is called
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| 117 | <quote>bootstrapping</quote>. Building GCC in this way ensures that it was
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| 118 | compiled correctly and is now the default configuration for the released
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| 119 | package. Continue with compiling by running:</para>
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| 120 |
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[0445a3d] | 121 | <screen><userinput remap="make">make</userinput></screen>
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[81fd230] | 122 |
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[1f7ca93] | 123 | <para>Compilation is now complete. At this point, the test suite would
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| 124 | normally be run, but, as mentioned before, the test suite framework is
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| 125 | not in place yet. The benefits of running the tests at this point
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| 126 | are minimal since the programs from this first pass will soon be
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| 127 | replaced.</para>
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| 128 |
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| 129 | <para>Install the package:</para>
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[73aedd1d] | 130 |
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[0445a3d] | 131 | <screen><userinput remap="install">make install</userinput></screen>
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[73aedd1d] | 132 |
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[1f7ca93] | 133 | <para>As a finishing touch, create a symlink. Many programs and scripts
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| 134 | run <command>cc</command> instead of <command>gcc</command>, which is
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| 135 | used to keep programs generic and therefore usable on all kinds of UNIX
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| 136 | systems where the GNU C compiler is not always installed. Running
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| 137 | <command>cc</command> leaves the system administrator free to decide
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[f19e766] | 138 | which C compiler to install:</para>
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[3d36131c] | 139 |
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[0445a3d] | 140 | <screen><userinput remap="install">ln -vs gcc /tools/bin/cc</userinput></screen>
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[73aedd1d] | 141 |
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[1f7ca93] | 142 | </sect2>
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[bc82645e] | 143 |
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[1f7ca93] | 144 | <sect2 role="content">
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| 145 | <title/>
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[81fd230] | 146 |
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[1f7ca93] | 147 | <para>Details on this package are located in
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| 148 | <xref linkend="contents-gcc" role="."/></para>
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[81fd230] | 149 |
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[1f7ca93] | 150 | </sect2>
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| 151 |
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| 152 | </sect1>
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