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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/2003/XInclude"
href="../chapter06/glibc.xml"
xpointer="xpointer(/sect1/sect2[1]/para[1])"/>
<segmentedlist>
<segtitle>&buildtime;</segtitle>
<segtitle>&diskspace;</segtitle>
<seglistitem>
<seg>&glibc-ch5-sbu;</seg>
<seg>&glibc-ch5-du;</seg>
</seglistitem>
</segmentedlist>
</sect2>
<sect2 role="installation">
<title>Installation of Glibc</title>
<para>The Glibc documentation recommends building Glibc outside of the source
directory in a dedicated build directory:</para>
<screen><userinput remap="pre">mkdir -v ../glibc-build
cd ../glibc-build</userinput></screen>
<para>Because Glibc no longer supports i386, its developers say to use the
compiler flag <parameter>-march=i486</parameter> when building it for x86
machines. There are several ways to accomplish that, but testing shows that
the flag is best placed inside the build variable <quote>CFLAGS</quote>.
Instead of overriding completely what Glibc's internal build system uses
for CFLAGS, append the new flag to the existing contents of CFLAGS by
making use of the special file <filename>configparms</filename>. The
-mtune=native flag is also necessary to reset a reasonable value for -mtune
that is changed when setting -march.</para>
<screen><userinput remap="configure">case `uname -m` in
i?86) echo "CFLAGS += -march=i486 -mtune=native" > configparms ;;
esac</userinput></screen>
<para>Next, prepare Glibc for compilation:</para>
<screen><userinput remap="configure">../glibc-&glibc-version;/configure --prefix=/tools \
--host=$LFS_TGT --build=$(../glibc-&glibc-version;/scripts/config.guess) \
--disable-profile --enable-add-ons \
--enable-kernel=2.6.18 --with-headers=/tools/include \
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=$LFS_TGT, --build=$(../glibc-&glibc-version;/scripts/config.guess)</parameter></term>
<listitem>
<para>The combined effect of these switches is that Glibc's build system
configures itself to cross-compile, using the cross-linker and
cross-compiler in <filename class="directory">/tools</filename>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>--disable-profile</parameter></term>
<listitem>
<para>This builds the libraries without profiling information. Omit
this option if profiling on the temporary tools is necessary.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>--enable-add-ons</parameter></term>
<listitem>
<para>This tells Glibc to use the NPTL add-on as its threading
library.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>--enable-kernel=2.6.18</parameter></term>
<listitem>
<para>This tells Glibc to compile the library with support
for 2.6.18 and later Linux kernels. Workarounds for older
kernels are not enabled.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>--with-headers=/tools/include</parameter></term>
<listitem>
<para>This tells Glibc to compile itself against the headers recently
installed to the tools directory, so that it knows exactly what
features the kernel has and can optimize itself accordingly.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>libc_cv_forced_unwind=yes</parameter></term>
<listitem>
<para>The build requires support for forced unwind, but because it is
being cross compiled, it cannot auto detect it. Setting this variable
on the command line explicitly tells the
<command>configure</command> script that support is available.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>libc_cv_c_cleanup=yes</parameter></term>
<listitem>
<para>The build also requires support for C cleanup handling, which it
cannot auto detect when being cross compiled. Enable it explicitly.</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>
<para>Compile the package:</para>
<screen><userinput remap="make">make</userinput></screen>
<para>This package does come with a test suite, however, it cannot be
run at this time because we do not have a C++ compiler yet.</para>
<note>
<para>The test suite also requires locale data to be installed in order to run
successfully. Locale data provides information to the system regarding
such things as the date, time, and currency formats accepted and output by
system utilities. If the test suites are not being run in this chapter
(as per the recommendation), there is no need to install the locales now.
The appropriate locales will be installed in the next chapter. To install
the Glibc locales anyway, use instructions from <xref
linkend="ch-system-glibc" role="."/></para>
</note>
<para>Install the package:</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-glibc" role="."/></para>
</sect2>
</sect1>
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