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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
<!ENTITY % general-entities SYSTEM "../general.ent">
%general-entities;
]>
<sect1 id="ch-tools-libstdcpp-pass2" role="wrap">
<?dbhtml filename="gcc-libstdc++-pass2.html"?>
<sect1info condition="script">
<productname>gcc-libstdc++</productname>
<productnumber>&gcc-version;</productnumber>
<address>&gcc-url;</address>
</sect1info>
<title>Libstdc++ from GCC-&gcc-version;, Pass 2</title>
<indexterm zone="ch-tools-libstdcpp-pass2">
<primary sortas="a-GCC">GCC</primary>
<secondary>tools, libstdc++ pass 2</secondary>
</indexterm>
<sect2 role="package">
<title/>
<para>When building <xref linkend="ch-tools-gcc-pass2"/> we had to defer
the installation of the C++ standard library because no suitable compiler
was available to compile it. We could not use the compiler built in that
section because it is a native compiler and should not be used outside of
chroot and risks polluting the libraries with some host components.</para>
<segmentedlist>
<segtitle>&buildtime;</segtitle>
<segtitle>&diskspace;</segtitle>
<seglistitem>
<seg>&libstdcpp-tmpp2-sbu;</seg>
<seg>&libstdcpp-tmpp2-du;</seg>
</seglistitem>
</segmentedlist>
</sect2>
<sect2 role="installation">
<title>Installation of Target Libstdc++</title>
<note>
<para><application>Libstdc++</application> is part of the GCC sources.
You should first unpack the GCC tarball and change to the
<filename>gcc-&gcc-version;</filename> directory.</para>
</note>
<para>Create a link which exists when building libstdc++ in the gcc tree:</para>
<screen><userinput remap="pre">ln -s gthr-posix.h libgcc/gthr-default.h</userinput></screen>
<para>Create a separate build directory for libstdc++ and enter it:</para>
<screen><userinput remap="pre">mkdir -v build
cd build</userinput></screen>
<para>Prepare libstdc++ for compilation:</para>
<screen><userinput remap="configure">../libstdc++-v3/configure \
CXXFLAGS="-g -O2 -D_GNU_SOURCE" \
--prefix=/usr \
--disable-multilib \
--disable-nls \
--host=$(uname -m)-lfs-linux-gnu \
--disable-libstdcxx-pch</userinput></screen>
<variablelist>
<title>The meaning of the configure options:</title>
<varlistentry>
<term><parameter>CXXFLAGS="-g -O2 -D_GNU_SOURCE"</parameter></term>
<listitem>
<para>These flags are passed by the top level Makefile when doing
a full build of GCC.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>--host=$(uname -m)-lfs-linux-gnu</parameter></term>
<listitem>
<para>We have to mimic what would happen if this package were built
as part of a full compiler build. This switch would be passed to
configure by GCC's build machinery.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>--disable-libstdcxx-pch</parameter></term>
<listitem>
<para>This switch prevents the installation of precompiled
include files, which are not needed at this stage.</para>
</listitem>
</varlistentry>
</variablelist>
<para>Compile libstdc++ by running:</para>
<screen><userinput remap="make">make</userinput></screen>
<para>Install the library:</para>
<screen><userinput remap="install">make install</userinput></screen>
</sect2>
<sect2 role="content">
<title/>
<para>Details on this package are located in <xref linkend="contents-gcc" role="."/></para>
</sect2>
</sect1>
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