chapter05/libstdc++.xml

   1 <?xml version="1.0" encoding="ISO-8859-1"?>
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   5   %general-entities;
   6 ]>
   7
   8 <sect1 id="ch-tools-libstdcpp" role="wrap">
   9   <?dbhtml filename="gcc-libstdc++.html"?>
  10
  11   <sect1info condition="script">
  12     <productname>gcc</productname>
  13     <productnumber>&gcc-version;</productnumber>
  14     <address>&gcc-url;</address>
  15   </sect1info>
  16
  17   <title>Libstdc++ from GCC-&gcc-version;</title>
  18
  19   <indexterm zone="ch-tools-libstdcpp">
  20     <primary sortas="a-GCC">GCC</primary>
  21     <secondary>tools, libstdc++</secondary>
  22   </indexterm>
  23
  24   <sect2 role="package">
  25     <title/>
  26
  27     <para>Libstdc++ is the standard C++ library. It is needed
  28     to compile C++ code
  29     (part of GCC is written in C++), but we had to defer its installation
  30     when we built <xref linkend="ch-tools-gcc-pass1"/>
  31     because it depends on glibc, which was not yet available in /tools.
  32     </para>
  33
  34     <segmentedlist>
  35       <segtitle>&buildtime;</segtitle>
  36       <segtitle>&diskspace;</segtitle>
  37
  38       <seglistitem>
  39         <seg>&libstdcpp-ch5-sbu;</seg>
  40         <seg>&libstdcpp-ch5-du;</seg>
  41       </seglistitem>
  42     </segmentedlist>
  43
  44   </sect2>
  45
  46   <sect2 role="installation">
  47     <title>Installation of Target Libstdc++</title>
  48
  49     <note>
  50       <para><application>Libstdc++</application> is part of the GCC sources.
  51       You should first unpack the GCC tarball and change to the
  52       <filename>gcc-&gcc-version;</filename> directory.</para>
  53     </note>
  54
  55     <para>Create a separate build directory for Libstdc++ and enter it:</para>
  56
  57 <screen><userinput remap="pre">mkdir -v build
  58 cd       build</userinput></screen>
  59
  60     <para>Prepare Libstdc++ for compilation:</para>
  61
  62 <screen><userinput remap="configure">../libstdc++-v3/configure           \
  63     --host=$LFS_TGT                 \
  64     --prefix=/tools                 \
  65     --disable-multilib              \
  66     --disable-nls                   \
  67     --disable-libstdcxx-threads     \
  68     --disable-libstdcxx-pch         \
  69     --with-gxx-include-dir=/tools/$LFS_TGT/include/c++/&gcc-version;</userinput></screen>
  70
  71     <variablelist>
  72       <title>The meaning of the configure options:</title>
  73
  74       <varlistentry>
  75         <term><parameter>--host=...</parameter></term>
  76         <listitem>
  77           <para>Indicates to use the cross compiler we have just built
  78           instead of the one in <filename>/usr/bin</filename>.</para>
  79         </listitem>
  80       </varlistentry>
  81
  82       <varlistentry>
  83         <term><parameter>--disable-libstdcxx-threads</parameter></term>
  84         <listitem>
  85           <para>Since we have not yet built the C threads library, the C++
  86           one cannot be built either.</para>
  87         </listitem>
  88       </varlistentry>
  89
  90       <varlistentry>
  91         <term><parameter>--disable-libstdcxx-pch</parameter></term>
  92         <listitem>
  93           <para>This switch prevents the installation of precompiled
  94           include files, which are not needed at this stage.</para>
  95         </listitem>
  96       </varlistentry>
  97
  98       <varlistentry>
  99         <term><parameter>--with-gxx-include-dir=/tools/$LFS_TGT/include/c++/&gcc-version;</parameter></term>
 100         <listitem>
 101           <para>This is the location where the standard include files are
 102           searched by the C++ compiler. In a normal build, this information
 103           is automatically passed to the Libstdc++ <command>configure</command>
 104           options from the top level directory. In our case, this information
 105           must be explicitly given.</para>
 106         </listitem>
 107       </varlistentry>
 108
 109     </variablelist>
 110
 111     <para>Compile libstdc++ by running:</para>
 112
 113 <screen><userinput remap="make">make</userinput></screen>
 114
 115     <para>Install the library:</para>
 116
 117 <screen><userinput remap="install">make install</userinput></screen>
 118
 119   </sect2>
 120
 121   <sect2 role="content">
 122     <title/>
 123
 124     <para>Details on this package are located in
 125     <xref linkend="contents-gcc" role="."/></para>
 126
 127   </sect2>
 128
 129 </sect1>