[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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| 11 | <title>GCC-&gcc-version; - Pass 1</title>
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| 12 |
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| 13 | <indexterm zone="ch-tools-gcc-pass1">
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| 14 | <primary sortas="a-GCC">GCC</primary>
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| 15 | <secondary>tools, pass 1</secondary>
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| 16 | </indexterm>
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| 17 |
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| 18 | <sect2 role="package">
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| 19 | <title/>
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[bc82645e] | 20 |
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[1f7ca93] | 21 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
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| 22 | href="../chapter06/gcc.xml"
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| 23 | xpointer="xpointer(/sect1/sect2[1]/para[1])"/>
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[81fd230] | 24 |
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[1f7ca93] | 25 | <segmentedlist>
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| 26 | <segtitle>&buildtime;</segtitle>
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| 27 | <segtitle>&diskspace;</segtitle>
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[5888299] | 28 |
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[1f7ca93] | 29 | <seglistitem>
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[e4a5635] | 30 | <seg>&gcc-ch5p1-sbu;</seg>
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| 31 | <seg>&gcc-ch5p1-du;</seg>
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[1f7ca93] | 32 | </seglistitem>
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| 33 | </segmentedlist>
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[673b0d8] | 34 |
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[1f7ca93] | 35 | </sect2>
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[73aedd1d] | 36 |
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[1f7ca93] | 37 | <sect2 role="installation">
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| 38 | <title>Installation of GCC</title>
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[73aedd1d] | 39 |
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[1f7ca93] | 40 | <para>The GCC documentation recommends building GCC outside of the
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| 41 | source directory in a dedicated build directory:</para>
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[3d36131c] | 42 |
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[5998892] | 43 | <screen><userinput>mkdir -v ../gcc-build
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[73aedd1d] | 44 | cd ../gcc-build</userinput></screen>
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| 45 |
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[1f7ca93] | 46 | <para>Prepare GCC for compilation:</para>
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[73aedd1d] | 47 |
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[acec478] | 48 | <screen><userinput>CC="gcc -B/usr/bin/" ../gcc-&gcc-version;/configure --prefix=/tools \
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[54ce9a9] | 49 | --with-local-prefix=/tools --disable-nls --disable-shared \
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[1218687] | 50 | --enable-languages=c --disable-multilib</userinput></screen>
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[81fd230] | 51 |
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[1f7ca93] | 52 | <variablelist>
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| 53 | <title>The meaning of the configure options:</title>
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| 54 |
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[acec478] | 55 | <varlistentry>
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| 56 | <term><envar>CC="gcc -B/usr/bin/"</envar></term>
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| 57 | <listitem>
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| 58 | <para>This forces <command>gcc</command> to prefer the linker from
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| 59 | the host in <filename class="directory">/usr/bin</filename>. This
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| 60 | is necessary on some hosts where the new <command>ld</command>
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| 61 | built in the previous section is not compatible with the host's
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| 62 | <command>gcc</command>.</para>
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| 63 | </listitem>
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| 64 | </varlistentry>
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| 65 |
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[1f7ca93] | 66 | <varlistentry>
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| 67 | <term><parameter>--with-local-prefix=/tools</parameter></term>
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| 68 | <listitem>
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| 69 | <para>The purpose of this switch is to remove <filename
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| 70 | class="directory">/usr/local/include</filename> from
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| 71 | <command>gcc</command>'s include search path. This is not
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| 72 | absolutely essential, however, it helps to minimize the
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| 73 | influence of the host system.</para>
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| 74 | </listitem>
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| 75 | </varlistentry>
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| 76 |
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| 77 | <varlistentry>
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[54ce9a9] | 78 | <term><parameter>--disable-shared</parameter></term>
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[1f7ca93] | 79 | <listitem>
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[54ce9a9] | 80 | <para>This forces gcc to link its internal libraries statically. We do this
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| 81 | to avoid possible issues with the host system.</para>
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[1f7ca93] | 82 | </listitem>
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| 83 | </varlistentry>
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| 84 |
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| 85 | <varlistentry>
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| 86 | <term><parameter>--enable-languages=c</parameter></term>
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| 87 | <listitem>
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| 88 | <para>This option ensures that only the C compiler is built.</para>
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| 89 | </listitem>
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| 90 | </varlistentry>
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| 91 |
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[1218687] | 92 | <varlistentry>
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| 93 | <term><parameter>--disable-multilib</parameter></term>
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| 94 | <listitem>
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| 95 | <para>We currently only want to build support for 64-bit libraries.</para>
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| 96 | </listitem>
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| 97 | </varlistentry>
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| 98 |
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[1f7ca93] | 99 | </variablelist>
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| 100 |
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| 101 | <para>Continue with compiling the package:</para>
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[73aedd1d] | 102 |
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[516b668] | 103 | <screen><userinput>make bootstrap</userinput></screen>
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[73aedd1d] | 104 |
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[1f7ca93] | 105 | <variablelist>
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[28bb0634] | 106 | <title>The meaning of the make parameter:</title>
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[81fd230] | 107 |
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[1f7ca93] | 108 | <varlistentry>
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| 109 | <term><parameter>bootstrap</parameter></term>
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| 110 | <listitem>
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| 111 | <para>This target does not just compile GCC, but compiles it
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| 112 | several times. It uses the programs compiled in a first round
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| 113 | to compile itself a second time, and then again a third time.
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| 114 | It then compares these second and third compiles to make sure
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| 115 | it can reproduce itself flawlessly. This also implies that it
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| 116 | was compiled correctly.</para>
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| 117 | </listitem>
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| 118 | </varlistentry>
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[81fd230] | 119 |
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[1f7ca93] | 120 | </variablelist>
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[81fd230] | 121 |
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[1f7ca93] | 122 | <para>Compilation is now complete. At this point, the test suite would
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| 123 | normally be run, but, as mentioned before, the test suite framework is
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| 124 | not in place yet. The benefits of running the tests at this point
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| 125 | are minimal since the programs from this first pass will soon be
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| 126 | replaced.</para>
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| 127 |
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| 128 | <para>Install the package:</para>
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[73aedd1d] | 129 |
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| 130 | <screen><userinput>make install</userinput></screen>
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| 131 |
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[bdd659b] | 132 | <para>Using <command>--disable-shared</command> means that the file
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| 133 | <filename class="libraryfile">libgcc_eh.a</filename>
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| 134 | isn't created and installed. The next package, Glibc, depends on this
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| 135 | library as it uses <command>-lgcc_eh</command> within its build system.
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| 136 | We can satisfy that dependency by creating a symlink to
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| 137 | <filename class="libraryfile">libgcc.a</filename>, since that file will
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| 138 | end up containing the objects normally contained in
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| 139 | <filename class="libraryfile">libgcc_eh.a</filename>.</para>
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[1799ee3] | 140 |
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| 141 | <screen><userinput>ln -vs libgcc.a `gcc -print-libgcc-file-name | \
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| 142 | sed 's/libgcc/&_eh/'`</userinput></screen>
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| 143 |
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[1f7ca93] | 144 | <para>As a finishing touch, create a symlink. Many programs and scripts
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| 145 | run <command>cc</command> instead of <command>gcc</command>, which is
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| 146 | used to keep programs generic and therefore usable on all kinds of UNIX
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| 147 | systems where the GNU C compiler is not always installed. Running
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| 148 | <command>cc</command> leaves the system administrator free to decide
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[f19e766] | 149 | which C compiler to install:</para>
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[3d36131c] | 150 |
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[5998892] | 151 | <screen><userinput>ln -vs gcc /tools/bin/cc</userinput></screen>
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[73aedd1d] | 152 |
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[1f7ca93] | 153 | </sect2>
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[bc82645e] | 154 |
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[1f7ca93] | 155 | <sect2 role="content">
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| 156 | <title/>
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[81fd230] | 157 |
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[1f7ca93] | 158 | <para>Details on this package are located in
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| 159 | <xref linkend="contents-gcc" role="."/></para>
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[81fd230] | 160 |
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[1f7ca93] | 161 | </sect2>
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| 162 |
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| 163 | </sect1>
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