[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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[1f7ca93] | 46 | <para>The GCC documentation recommends building GCC outside of the
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| 47 | source directory in a dedicated build directory:</para>
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[3d36131c] | 48 |
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[0445a3d] | 49 | <screen><userinput remap="pre">mkdir -v ../gcc-build
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[73aedd1d] | 50 | cd ../gcc-build</userinput></screen>
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| 51 |
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[1f7ca93] | 52 | <para>Prepare GCC for compilation:</para>
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[73aedd1d] | 53 |
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[0445a3d] | 54 | <screen><userinput remap="configure">CC="gcc -B/usr/bin/" ../gcc-&gcc-version;/configure --prefix=/tools \
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[f684ec6c] | 55 | --with-local-prefix=/tools --disable-nls --enable-shared \
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| 56 | --enable-languages=c</userinput></screen>
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[81fd230] | 57 |
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[1f7ca93] | 58 | <variablelist>
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| 59 | <title>The meaning of the configure options:</title>
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| 60 |
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[acec478] | 61 | <varlistentry>
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| 62 | <term><envar>CC="gcc -B/usr/bin/"</envar></term>
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| 63 | <listitem>
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| 64 | <para>This forces <command>gcc</command> to prefer the linker from
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| 65 | the host in <filename class="directory">/usr/bin</filename>. This
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| 66 | is necessary on some hosts where the new <command>ld</command>
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| 67 | built in the previous section is not compatible with the host's
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| 68 | <command>gcc</command>.</para>
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| 69 | </listitem>
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| 70 | </varlistentry>
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| 71 |
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[1f7ca93] | 72 | <varlistentry>
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| 73 | <term><parameter>--with-local-prefix=/tools</parameter></term>
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| 74 | <listitem>
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| 75 | <para>The purpose of this switch is to remove <filename
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| 76 | class="directory">/usr/local/include</filename> from
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| 77 | <command>gcc</command>'s include search path. This is not
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| 78 | absolutely essential, however, it helps to minimize the
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| 79 | influence of the host system.</para>
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| 80 | </listitem>
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| 81 | </varlistentry>
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| 82 |
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| 83 | <varlistentry>
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| 84 | <term><parameter>--enable-shared</parameter></term>
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| 85 | <listitem>
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| 86 | <para>This switch allows the building of <filename
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| 87 | class="libraryfile">libgcc_s.so.1</filename> and
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| 88 | <filename class="libraryfile">libgcc_eh.a</filename>.
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| 89 | Having <filename class="libraryfile">libgcc_eh.a</filename>
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| 90 | available ensures that the configure script for Glibc (the
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| 91 | next package we compile) produces the proper results.</para>
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| 92 | </listitem>
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| 93 | </varlistentry>
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| 94 |
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| 95 | <varlistentry>
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| 96 | <term><parameter>--enable-languages=c</parameter></term>
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| 97 | <listitem>
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| 98 | <para>This option ensures that only the C compiler is built.</para>
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| 99 | </listitem>
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| 100 | </varlistentry>
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| 101 |
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| 102 | </variablelist>
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| 103 |
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[b0a4c9a] | 104 | <para>The following command will compile GCC not once, but several times. It
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| 105 | uses the programs compiled in a first round to compile itself a second time,
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| 106 | and then again a third time. It then compares these second and third compiles
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| 107 | to make sure it can reproduce itself flawlessly. This is called
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| 108 | <quote>bootstrapping</quote>. Building GCC in this way ensures that it was
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| 109 | compiled correctly and is now the default configuration for the released
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| 110 | package. Continue with compiling by running:</para>
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| 111 |
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[0445a3d] | 112 | <screen><userinput remap="make">make</userinput></screen>
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[81fd230] | 113 |
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[1f7ca93] | 114 | <para>Compilation is now complete. At this point, the test suite would
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| 115 | normally be run, but, as mentioned before, the test suite framework is
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| 116 | not in place yet. The benefits of running the tests at this point
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| 117 | are minimal since the programs from this first pass will soon be
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| 118 | replaced.</para>
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| 119 |
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| 120 | <para>Install the package:</para>
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[73aedd1d] | 121 |
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[0445a3d] | 122 | <screen><userinput remap="install">make install</userinput></screen>
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[73aedd1d] | 123 |
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[1f7ca93] | 124 | <para>As a finishing touch, create a symlink. Many programs and scripts
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| 125 | run <command>cc</command> instead of <command>gcc</command>, which is
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| 126 | used to keep programs generic and therefore usable on all kinds of UNIX
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| 127 | systems where the GNU C compiler is not always installed. Running
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| 128 | <command>cc</command> leaves the system administrator free to decide
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[f19e766] | 129 | which C compiler to install:</para>
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[3d36131c] | 130 |
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[0445a3d] | 131 | <screen><userinput remap="install">ln -vs gcc /tools/bin/cc</userinput></screen>
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[73aedd1d] | 132 |
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[1f7ca93] | 133 | </sect2>
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[bc82645e] | 134 |
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[1f7ca93] | 135 | <sect2 role="content">
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| 136 | <title/>
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[81fd230] | 137 |
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[1f7ca93] | 138 | <para>Details on this package are located in
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| 139 | <xref linkend="contents-gcc" role="."/></para>
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[81fd230] | 140 |
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[1f7ca93] | 141 | </sect2>
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| 142 |
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| 143 | </sect1>
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