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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" role="wrap">
<?dbhtml filename="gcc-libstdc++.html"?>
<sect1info condition="script">
<productname>gcc-libstdc++</productname>
<productnumber>&gcc-version;</productnumber>
<address>&gcc-url;</address>
</sect1info>
<title>Libstdc++ from GCC-&gcc-version;</title>
<indexterm zone="ch-tools-libstdcpp">
<primary sortas="a-GCC">GCC</primary>
<secondary>tools, libstdc++ pass 1</secondary>
</indexterm>
<sect2 role="package">
<title/>
<para>Libstdc++ is the standard C++ library. It is needed
to compile C++ code
(part of GCC is written in C++), but we had to defer its installation
when we built <xref linkend="ch-tools-gcc-pass1"/>
because it depends on glibc, which was not yet available in the target
directory.
</para>
<segmentedlist>
<segtitle>&buildtime;</segtitle>
<segtitle>&diskspace;</segtitle>
<seglistitem>
<seg>&libstdcpp-tmpp1-sbu;</seg>
<seg>&libstdcpp-tmpp1-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 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 \
--host=$LFS_TGT \
--build=$(../config.guess) \
--prefix=/usr \
--disable-multilib \
--disable-nls \
--disable-libstdcxx-pch \
--with-gxx-include-dir=/tools/$LFS_TGT/include/c++/&gcc-version;</userinput></screen>
<variablelist>
<title>The meaning of the configure options:</title>
<varlistentry>
<term><parameter>--host=...</parameter></term>
<listitem>
<para>Specifies that the cross compiler we have just built
should be used instead of the one in
<filename>/usr/bin</filename>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>--disable-libstdcxx-pch</parameter></term>
<listitem>
<para>This switch prevents the installation of precompiled
include files, which are not needed at this stage.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>--with-gxx-include-dir=/tools/$LFS_TGT/include/c++/&gcc-version;</parameter></term>
<listitem>
<para>This specifies the installation directory for include files.
Because libstdc++ is the standard C++ library for LFS, this
directory should match the location where the C++ compiler
(<command>$LFS_TGT-g++</command>) would search for the
standard C++ include files. In a normal build, this information
is automatically passed to the libstdc++ <command>configure</command>
options from the top level directory. In our case, this information
must be explicitly given.
The C++ compiler will prepend the sysroot path
<filename class="directory">$LFS</filename> (specified building
GCC pass 1) to the include file search path, so it will actually
search in
<filename class="directory">$LFS/tools/$LFS_TGT/include/c++/&gcc-version;</filename>.
The combination of the <parameter>DESTDIR</parameter>
variable (in the <command>make install</command> command below)
and this switch ensures to install the headers there.</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 DESTDIR=$LFS install</userinput></screen>
<para>Remove the libtool archive files because they are harmful for
cross compilation:</para>
<screen><userinput remap="install">rm -v $LFS/usr/lib/lib{stdc++,stdc++fs,supc++}.la</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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