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<?xml version="1.0" encoding="UTF-8"?>
<!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-generalinstructions"
xreflabel="General Compilation Instructions">
<?dbhtml filename="generalinstructions.html"?>
<title>General Compilation Instructions</title>
<caution>
<para>
During a development cycle of LFS, the instructions in the book are
often modified to adapt for a package update or take the advantage of
new features from updated packages. Mixing up the instructions of
different versions of the LFS book can cause subtle breakages. This
kind of issue is generally a result from reusing some script created
for a prior LFS release. Such a reuse is strongly discouraged. If
you are reusing scripts for a prior LFS release for any reason, you'll
need to be very careful to update the scripts to match current version
of the LFS book.
</para>
</caution>
<para>Here are some things you should know about building each package:</para>
<itemizedlist>
<listitem>
<para>Several packages are patched before compilation, but only when
the patch is needed to circumvent a problem. A patch is often needed in
both the current and the following chapters, but sometimes, when the same package
is built more than once, the patch is not needed right away.
Therefore, do not be concerned if instructions for a downloaded patch seem
to be missing. Warning messages about <emphasis>offset</emphasis> or
<emphasis>fuzz</emphasis> may also be encountered when applying a patch. Do
not worry about these warnings; the patch was still successfully
applied.</para>
</listitem>
<listitem>
<para>During the compilation of most packages, some
warnings will scroll by on the screen. These are normal and can safely be
ignored. These warnings are usually about
deprecated, but not invalid, use of the C or C++ syntax. C standards change
fairly often, and some packages have not yet been updated. This is not a
serious problem, but it does cause the warnings to appear.</para>
</listitem>
<listitem>
<para>Check one last time that the <envar>LFS</envar> environment variable
is set up properly:</para>
<screen role="nodump"><userinput>echo $LFS</userinput></screen>
<para>Make sure the output shows the path to the LFS partition's mount
point, which is <filename class="directory">/mnt/lfs</filename>, using our
example.</para>
</listitem>
<listitem>
<para>Finally, two important items must be emphasized:</para>
<important>
<para>The build instructions assume that the <xref
linkend='ch-partitioning-hostreqs'/>, including symbolic links, have
been set properly:</para>
<itemizedlist role='important'>
<listitem override='bullet'><para><command>bash</command> is the shell
in use.</para></listitem>
<listitem override='bullet'><para><command>sh</command> is a symbolic
link to <command>bash</command>.</para></listitem>
<listitem override='bullet'><para><command>/usr/bin/awk</command> is a
symbolic link to <command>gawk</command>.</para></listitem>
<listitem override='bullet'><para><command>/usr/bin/yacc</command> is a
symbolic link to <command>bison</command>, or to a small script that
executes bison.</para></listitem>
</itemizedlist>
</important>
<important>
<para>Here is a synopsis of the build process.</para>
<orderedlist numeration="arabic" spacing="compact">
<listitem>
<para>Place all the sources and patches in a directory that will be
accessible from the chroot environment, such as
<filename class="directory">/mnt/lfs/sources/</filename>.<!-- Do
<emphasis>not</emphasis> put sources in
<filename class="directory">/mnt/lfs/tools/</filename>. --></para>
</listitem>
<listitem>
<para>Change to the <filename class="directory">/mnt/lfs/sources/</filename> directory.</para>
</listitem>
<listitem id='buildinstr' xreflabel='Package build instructions'>
<para>For each package:</para>
<orderedlist numeration="loweralpha" spacing="compact">
<listitem>
<para>Using the <command>tar</command> program, extract the package
to be built. In <xref linkend="chapter-cross-tools"/> and
<xref linkend="chapter-temporary-tools"/>, ensure you are
the <emphasis>lfs</emphasis> user when extracting the package.</para>
<para>Do not use any method except the <command>tar</command> command
to extract the source code. Notably, using the <command>cp -R</command>
command to copy the
source code tree somewhere else can destroy links and
timestamps in the source tree, and cause the build to fail.</para>
</listitem>
<listitem>
<para>Change to the directory created when the package was
extracted.</para>
</listitem>
<listitem>
<para>Follow the instructions for building the package.</para>
</listitem>
<listitem>
<para>Change back to the sources directory when the build is complete.</para>
</listitem>
<listitem>
<para>Delete the extracted source directory unless instructed otherwise.</para>
</listitem>
</orderedlist>
</listitem>
</orderedlist>
</important>
</listitem>
</itemizedlist>
</sect1>
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