Initial commit of alternative cross LFS

git-svn-id: http://svn.linuxfromscratch.org/LFS/branches/cross2@11897 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

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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-system-libffi" role="wrap">
+  <?dbhtml filename="libffi.html"?>
+
+  <sect1info condition="script">
+    <productname>libffi</productname>
+    <productnumber>&libffi-version;</productnumber>
+    <address>&libffi-url;</address>
+  </sect1info>
+
+  <title>Libffi-&libffi-version;</title>
+
+  <indexterm zone="ch-system-libffi">
+    <primary sortas="a-libffi">libffi</primary>
+  </indexterm>
+
+  <sect2 role="package">
+    <title/>
+
+    <para>The Libffi library provides a portable, high level programming
+    interface to various calling conventions. This allows a programmer to call
+    any function specified by a call interface description at run time.</para>
+
+    <segmentedlist>
+      <segtitle>&buildtime;</segtitle>
+      <segtitle>&diskspace;</segtitle>
+
+      <seglistitem>
+        <seg>&libffi-ch6-sbu;</seg>
+        <seg>&libffi-ch6-du;</seg>
+      </seglistitem>
+    </segmentedlist>
+
+  </sect2>
+
+  <sect2 role="installation">
+    <title>Installation of Libffi</title>
+
+    <note>
+      <para>Similar to GMP, libffi builds with optimizations specific
+      to the proccesor in use. If building for another system, export
+      CFLAGS and CXXFLAGS to specify a generic build for your architecture.
+      If this is not done, all applications that link to libffi will trigger
+      Illegal Operation Errors.</para>
+    </note>
+<!--
+    <para>Modify the Makefile to install headers into the standard
+    <filename class="directory">/usr/include</filename> directory instead of
+    <filename class="directory">/usr/lib/libffi-&libffi-version;/include</filename>.</para>
+
+<screen><userinput remap="pre">sed -e '/^includesdir/ s/$(libdir).*$/$(includedir)/' \
+    -i include/Makefile.in
+
+sed -e '/^includedir/ s/=.*$/=@includedir@/' \
+    -e 's/^Cflags: -I${includedir}/Cflags:/' \
+    -i libffi.pc.in</userinput></screen>
+-->
+    <para>Prepare libffi for compilation:</para>
+
+<screen><userinput remap="configure">./configure --prefix=/usr --disable-static --with-gcc-arch=native</userinput></screen>
+
+    <variablelist>
+      <title>The meaning of the configure option:</title>
+
+      <varlistentry>
+        <term><parameter>--with-gcc-arch=native</parameter></term>
+        <listitem>
+          <para>Ensure gcc optimizes for the current system.  If this
+          is not specified, the system is guessed and the code generated
+          may not be correct for some systems.  If the generated code
+          will be copied from the native system to a less capable 
+          system, use the less capable system as a parameter. For details 
+          about alternative system types, see <ulink 
+          url='https://gcc.gnu.org/onlinedocs/gcc-&gcc-version;/gcc/x86-Options.html'>
+          the x86 options in the gcc manual</ulink>.</para>
+        </listitem>
+      </varlistentry>
+
+    </variablelist>
+
+    <para>Compile the package:</para>
+
+<screen><userinput remap="make">make</userinput></screen>
+
+    <para>To test the results, issue:</para>
+
+<screen><userinput remap="test">make check</userinput></screen>
+
+    <para>Six tests, all related to test-callback.c, are known to fail.</para>
+
+    <para>Install the package:</para>
+
+<screen><userinput remap="install">make install</userinput></screen>
+
+  </sect2>
+
+  <sect2 id="contents-libffi" role="content">
+    <title>Contents of Libffi</title>
+
+    <segmentedlist>
+      <segtitle>Installed library</segtitle>
+
+      <seglistitem>
+        <seg>libffi.so</seg>
+      </seglistitem>
+    </segmentedlist>
+
+    <variablelist>
+      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
+      <?dbfo list-presentation="list"?>
+      <?dbhtml list-presentation="table"?>
+
+      <varlistentry id="libffi">
+        <term><filename class="libraryfile">libffi</filename></term>
+        <listitem>
+          <para>contains the libffi API functions.</para>
+          <indexterm zone="ch-system-libffi">
+            <primary sortas="c-libffi">libffi</primary>
+          </indexterm>
+        </listitem>
+      </varlistentry>
+    </variablelist>
+
+  </sect2>
+
+</sect1>
+