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<!ENTITY % general-entities SYSTEM "../general.ent">
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<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 a symbolic link for LSB compliance. Additionally,
for x86_64, create a compatibility symbolic link required for proper
operation of the dynamic library loader:</para>
<screen><userinput remap="pre">case $(uname -m) in
i?86) ln -sfv ld-linux.so.2 $LFS/lib/ld-lsb.so.3
;;
x86_64) ln -sfv ../lib/ld-linux-x86-64.so.2 $LFS/lib64
ln -sfv ../lib/ld-linux-x86-64.so.2 $LFS/lib64/ld-lsb-x86-64.so.3
;;
esac</userinput></screen>
<note>
<para>
The above command is correct. The <command>ln</command> command has
several syntactic versions, so be sure to check
<command>info coreutils ln</command> and <filename>ln(1)</filename>
before reporting what may appear to be an error.
</para>
</note>
<para>Fix an issue building Glibc with parallel jobs and make-4.4
or later:</para>
<screen><userinput remap="pre">sed '/MAKEFLAGS :=/s/)r/) -r/' -i Makerules</userinput></screen>
<para>Some of the Glibc programs use the non-FHS-compliant
<filename class="directory">/var/db</filename> directory to store their
runtime data. Apply the following patch to make such programs store their
runtime data in the FHS-compliant locations:</para>
<screen><userinput remap="pre">patch -Np1 -i ../glibc-&glibc-version;-fhs-1.patch</userinput></screen>
<para>The Glibc documentation recommends building Glibc
in a dedicated build directory:</para>
<screen><userinput remap="pre">mkdir -v build
cd build</userinput></screen>
<para>Ensure that the <command>ldconfig</command> and <command>sln</command>
utilities are installed into
<filename class="directory">/usr/sbin</filename>:</para>
<screen><userinput remap="pre">echo "rootsbindir=/usr/sbin" > configparms</userinput></screen>
<para>Next, prepare Glibc for compilation:</para>
<screen><userinput remap="configure">../configure \
--prefix=/usr \
--host=$LFS_TGT \
--build=$(../scripts/config.guess) \
--enable-kernel=&min-kernel; \
--with-headers=$LFS/usr/include \
libc_cv_slibdir=/usr/lib</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">$LFS/tools</filename>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>--enable-kernel=&min-kernel;</parameter></term>
<listitem>
<para>This tells Glibc to compile the library with support
for &min-kernel; and later Linux kernels. Workarounds for older
kernels are not enabled.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>--with-headers=$LFS/usr/include</parameter></term>
<listitem>
<para>This tells Glibc to compile itself against the headers
recently installed to the $LFS/usr/include directory, so that
it knows exactly what features the kernel has and can optimize
itself accordingly.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>libc_cv_slibdir=/usr/lib</parameter></term>
<listitem>
<para>This ensures that the library is installed in /usr/lib instead
of the default /lib64 on 64-bit machines.</para>
</listitem>
</varlistentry>
</variablelist>
<para>During this stage the following warning might appear:</para>
<blockquote>
<screen><computeroutput>configure: WARNING:
*** These auxiliary programs are missing or
*** incompatible versions: msgfmt
*** some features will be disabled.
*** Check the INSTALL file for required versions.</computeroutput></screen>
</blockquote>
<para>The missing or incompatible <command>msgfmt</command> program is
generally harmless. This <command>msgfmt</command> program is part of the
Gettext package, which the host distribution should provide.</para>
<note><para>There have been reports that this package may fail when
building as a "parallel make". If that occurs, rerun the make command
with the "-j1" option.</para></note>
<para>Compile the package:</para>
<screen><userinput remap="make">make</userinput></screen>
<para>Install the package:</para>
<warning><para>If <envar>LFS</envar> is not properly set, and despite the
recommendations, you are building as
<systemitem class="username">root</systemitem>, the next command will
install the newly built Glibc to your host system, which will almost
certainly render it unusable. So double-check that the environment is
correctly set, and that you are not &root;, before running the following command.</para></warning>
<screen><userinput remap="install">make DESTDIR=$LFS install</userinput></screen>
<variablelist>
<title>The meaning of the <command>make install</command> option:</title>
<varlistentry>
<term><parameter>DESTDIR=$LFS</parameter></term>
<listitem>
<para>The <envar>DESTDIR</envar> make variable is used by almost all
packages to define the location where the package should be
installed. If it is not set, it defaults to the root (<filename
class="directory">/</filename>) directory. Here we specify that
the package is installed in <filename class="directory">$LFS
</filename>, which will become the root directory in <xref linkend=
"ch-tools-chroot"/>.</para>
</listitem>
</varlistentry>
</variablelist>
<para>Fix a hard coded path to the executable loader in the
<command>ldd</command> script:</para>
<screen><userinput remap="install">sed '/RTLDLIST=/s@/usr@@g' -i $LFS/usr/bin/ldd</userinput></screen>
<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(){}' | $LFS_TGT-gcc -xc -
readelf -l a.out | grep ld-linux</userinput></screen>
<para>If everything is working correctly, there should be no errors,
and the output of the last command will be of the form:</para>
<screen><computeroutput>[Requesting program interpreter: /lib64/ld-linux-x86-64.so.2]</computeroutput></screen>
<para>Note that for 32-bit machines, the interpreter name will be
<filename>/lib/ld-linux.so.2</filename>.</para>
<para>If the output is not as shown above, or there is no output at all,
then something is wrong. Investigate and retrace the steps to find out
where the problem is and correct it. This issue must be resolved before
continuing.</para>
<para>Once all is well, clean up the test file:</para>
<screen><userinput>rm -v a.out</userinput></screen>
</caution>
<note><para>Building the packages in the next chapter will serve as an
additional check that the toolchain has been built properly. If some
package, especially Binutils-pass2 or GCC-pass2, fails to build, it is
an indication that something has gone wrong with the
preceding Binutils, GCC, or Glibc installations.</para></note>
<para>Now that our cross-toolchain is complete, finalize the installation
of the limits.h header. To do this, run a utility provided by the GCC
developers:</para>
<screen><userinput>$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>