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130 lines
4.1 KiB
XML
130 lines
4.1 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY % general-entities SYSTEM "../general.ent">
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%general-entities;
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]>
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<sect1 id="ch-system-libffi" role="wrap">
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<?dbhtml filename="libffi.html"?>
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<sect1info condition="script">
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<productname>libffi</productname>
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<productnumber>&libffi-version;</productnumber>
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<address>&libffi-url;</address>
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</sect1info>
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<title>Libffi-&libffi-version;</title>
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<indexterm zone="ch-system-libffi">
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<primary sortas="a-libffi">libffi</primary>
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</indexterm>
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<sect2 role="package">
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<title/>
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<para>The Libffi library provides a portable, high level programming
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interface to various calling conventions. This allows a programmer to call
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any function specified by a call interface description at run time.</para>
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<para>FFI stands for Foreign Function Interface. An FFI allows a program written
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in one language to call a program written in another language. Specifically,
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Libffi can provide a bridge between an interpreter like Perl, or Python, and
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shared library subroutines written in C, or C++.</para>
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<segmentedlist>
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<segtitle>&buildtime;</segtitle>
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<segtitle>&diskspace;</segtitle>
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<seglistitem>
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<seg>&libffi-fin-sbu;</seg>
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<seg>&libffi-fin-du;</seg>
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</seglistitem>
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</segmentedlist>
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</sect2>
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<sect2 role="installation">
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<title>Installation of Libffi</title>
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<note>
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<para>Like GMP, Libffi builds with optimizations specific
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to the processor in use. If building for another system, change the
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value of the <parameter>--with-gcc-arch=</parameter> parameter in the
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following command to an architecture name fully implemented by the
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CPU on that system.
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If this is not done, all applications that link to
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<filename class='libraryfile'>libffi</filename> will trigger
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Illegal Operation Errors.</para>
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</note>
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<para>Prepare Libffi for compilation:</para>
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<screen><userinput remap="configure">./configure --prefix=/usr \
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--disable-static \
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--with-gcc-arch=native</userinput></screen>
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<variablelist>
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<title>The meaning of the configure option:</title>
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<varlistentry>
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<term><parameter>--with-gcc-arch=native</parameter></term>
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<listitem>
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<para>Ensure GCC optimizes for the current system. If this
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is not specified, the system is guessed and the code generated
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may not be correct. If the generated code
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will be copied from the native system to a less capable
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system, use the less capable system as a parameter. For details
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about alternative system types, see <ulink
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url='https://gcc.gnu.org/onlinedocs/gcc-&gcc-version;/gcc/x86-Options.html'>
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the x86 options in the GCC manual</ulink>.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>Compile the package:</para>
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<screen><userinput remap="make">make</userinput></screen>
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<para>To test the results, issue:</para>
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<screen><userinput remap="test">make check</userinput></screen>
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<para>Install the package:</para>
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<screen><userinput remap="install">make install</userinput></screen>
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</sect2>
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<sect2 id="contents-libffi" role="content">
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<title>Contents of Libffi</title>
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<segmentedlist>
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<segtitle>Installed library</segtitle>
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<seglistitem>
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<seg>libffi.so</seg>
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</seglistitem>
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</segmentedlist>
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<variablelist>
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<bridgehead renderas="sect3">Short Descriptions</bridgehead>
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<?dbfo list-presentation="list"?>
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<?dbhtml list-presentation="table"?>
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<varlistentry id="libffi">
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<term><filename class="libraryfile">libffi</filename></term>
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<listitem>
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<para>Contains the foreign function interface API functions</para>
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<indexterm zone="ch-system-libffi">
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<primary sortas="c-libffi">libffi</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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</variablelist>
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</sect2>
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</sect1>
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