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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-glibc" role="wrap">
<?dbhtml filename="glibc.html"?>
<sect1info condition="script">
<productname>glibc</productname>
<productnumber>&glibc-version;</productnumber>
<address>&glibc-url;</address>
</sect1info>
<title>Glibc-&glibc-version;</title>
<indexterm zone="ch-tools-glibc">
<primary sortas="a-Glibc">Glibc</primary>
<secondary>tools</secondary>
</indexterm>
<sect2 role="package">
<title/>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
href="../chapter08/glibc.xml"
xpointer="xpointer(/sect1/sect2[1]/para[1])"/>
<segmentedlist>
<segtitle>&buildtime;</segtitle>
<segtitle>&diskspace;</segtitle>
<seglistitem>
<seg>&glibc-tmp-sbu;</seg>
<seg>&glibc-tmp-du;</seg>
</seglistitem>
</segmentedlist>
</sect2>
<sect2 role="installation">
<title>Installation of Glibc</title>
<para>First, create two symbolic links, which are needed for proper
operation of the dynamic library loader:</para>
<screen><userinput remap="pre">ln -sfv ../lib/ld-linux-x86-64.so.2 $LFS/lib64
ln -sfv ../lib/ld-linux-x86-64.so.2 $LFS/lib64/ld-lsb-x86-64.so.3</userinput></screen>
<para>Some of the Glibc programs use the non-FHS compliant
<filename class="directory">/var/db</filename> directory to store their
runtime data. Apply the following patch to make such programs store their
runtime data in the FHS-compliant locations:</para>
<screen><userinput remap="pre">patch -Np1 -i ../glibc-&glibc-version;-fhs-1.patch</userinput></screen>
<para>The Glibc documentation recommends building Glibc
in a dedicated build directory:</para>
<screen><userinput remap="pre">mkdir -v build
cd build</userinput></screen>
<para>Next, prepare Glibc for compilation:</para>
<screen><userinput remap="configure">../configure \
--prefix=/usr \
--host=$LFS_TGT \
--build=$(../scripts/config.guess) \
--enable-kernel=&min-kernel; \
--with-headers=$LFS/usr/include \
libc_cv_slibdir=/lib</userinput></screen>
<!--
libc_cv_forced_unwind=yes \
libc_cv_c_cleanup=yes</userinput></screen> -->
<variablelist>
<title>The meaning of the configure options:</title>
<varlistentry>
<term><parameter>--host=$LFS_TGT, --build=$(../scripts/config.guess)</parameter></term>
<listitem>
<para>The combined effect of these switches is that Glibc's build system
configures itself to be cross-compiled, using the cross-linker and
cross-compiler in <filename class="directory">/tools</filename>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>--enable-kernel=&min-kernel;</parameter></term>
<listitem>
<para>This tells Glibc to compile the library with support
for &min-kernel; and later Linux kernels. Workarounds for older
kernels are not enabled.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>--with-headers=$LFS/usr/include</parameter></term>
<listitem>
<para>This tells Glibc to compile itself against the headers
recently installed to the $LFS/usr/include directory, so that
it knows exactly what features the kernel has and can optimize
itself accordingly.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>libc_cv_slibdir=/lib</parameter></term>
<listitem>
<para>This ensures that the library is installed in /lib instead
of the default /lib64 on 64 bit machines.</para>
</listitem>
</varlistentry>
</variablelist>
<para>During this stage the following warning might appear:</para>
<blockquote>
<screen><computeroutput>configure: WARNING:
*** These auxiliary programs are missing or
*** incompatible versions: msgfmt
*** some features will be disabled.
*** Check the INSTALL file for required versions.</computeroutput></screen>
</blockquote>
<para>The missing or incompatible <command>msgfmt</command> program is
generally harmless. This <command>msgfmt</command> program is part of the
Gettext package which the host distribution should provide.</para>
<note><para>There have been reports that this package may fail when
building as a "parallel make". If this occurs, rerun the make command
with a "-j1" option.</para></note>
<para>Compile the package:</para>
<screen><userinput remap="make">make</userinput></screen>
<para>Install the package:</para>
<warning><para>If <envar>LFS</envar> is not properly set, and despite the
recommendations, you are building as root, the next command will install
the newly built glibc to your host system, which most likely will render it
unusable. So double check that the environment is correctly set for user
<systemitem class="username">lfs</systemitem>.</para></warning>
<screen><userinput remap="install">make DESTDIR=$LFS install</userinput></screen>
<variablelist>
<title>The meaning of the <command>make install</command> option:</title>
<varlistentry>
<term><parameter>DESTDIR=$LFS</parameter></term>
<listitem>
<para>The <envar>DESTDIR</envar> make variable is used by almost all
packages to define the location where the package should be
installed. If it is not set, it defaults to the root (<filename
class="directory">/</filename>) directory. Here we specify that
the package be installed in <filename class="directory">$LFS
</filename>, which will become the root after <xref linkend=
"ch-tools-chroot"/>.</para>
</listitem>
</varlistentry>
</variablelist>
<caution>
<para>At this point, it is imperative to stop and ensure that the basic
functions (compiling and linking) of the new toolchain are working as
expected. To perform a sanity check, run the following commands:</para>
<screen><userinput>echo 'int main(){}' > dummy.c
$LFS_TGT-gcc dummy.c
readelf -l a.out | grep '/ld-linux'</userinput></screen>
<para>If everything is working correctly, there should be no errors,
and the output of the last command will be of the form:</para>
<screen><computeroutput>[Requesting program interpreter: /lib64/ld-linux-x86-64.so.2]</computeroutput></screen>
<para>Note that for 32-bit machines, the interpreter name will be
<filename>/lib/ld-linux.so.2</filename>.</para>
<para>If the output is not shown as above or there was no output at all,
then something is wrong. Investigate and retrace the steps to find out
where the problem is and correct it. This issue must be resolved before
continuing on.</para>
<para>Once all is well, clean up the test files:</para>
<screen><userinput>rm -v dummy.c a.out</userinput></screen>
</caution>
<note><para>Building packages in the next chapter will serve as an
additional check that the toolchain has been built properly. If some
package, especially binutils-pass2 or gcc-pass2, fails to build, it is
an indication that something has gone wrong with the
previous Binutils, GCC, or Glibc installations.</para></note>
<para>Now that our cross-toolchain is complete, finalize the installation
of the limits.h header. For doing so, run a utility provided by the GCC
developers:</para>
<screen><userinput>$LFS/tools/libexec/gcc/$LFS_TGT/&gcc-version;/install-tools/mkheaders</userinput></screen>
</sect2>
<sect2 role="content">
<title/>
<para>Details on this package are located in
<xref linkend="contents-glibc" role="."/></para>
</sect2>
</sect1>
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