[7152faa] | 1 | <?xml version="1.0" encoding="UTF-8"?>
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[b0aabe0] | 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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| 4 | <!ENTITY % general-entities SYSTEM "../general.ent">
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| 5 | %general-entities;
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| 6 | ]>
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| 7 |
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| 8 | <sect1 id="ch-system-libffi" role="wrap">
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| 9 | <?dbhtml filename="libffi.html"?>
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| 10 |
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| 11 | <sect1info condition="script">
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| 12 | <productname>libffi</productname>
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| 13 | <productnumber>&libffi-version;</productnumber>
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| 14 | <address>&libffi-url;</address>
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| 15 | </sect1info>
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| 16 |
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[e03d5e49] | 17 | <title>Libffi-&libffi-version;</title>
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[b0aabe0] | 18 |
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| 19 | <indexterm zone="ch-system-libffi">
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| 20 | <primary sortas="a-libffi">libffi</primary>
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| 21 | </indexterm>
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| 22 |
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| 23 | <sect2 role="package">
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| 24 | <title/>
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| 25 |
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[e03d5e49] | 26 | <para>The Libffi library provides a portable, high level programming
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[b0aabe0] | 27 | interface to various calling conventions. This allows a programmer to call
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| 28 | any function specified by a call interface description at run time.</para>
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[e9c46b3] | 29 |
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| 30 | <para>FFI stands for Foreign Function Interface. An FFI allows a program written
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| 31 | in one language to call a program written in another language. Specifically,
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| 32 | Libffi can provide a bridge between an interpreter like Perl, or Python, and
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| 33 | shared library subroutines written in C, or C++.</para>
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[b0aabe0] | 34 |
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| 35 | <segmentedlist>
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| 36 | <segtitle>&buildtime;</segtitle>
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| 37 | <segtitle>&diskspace;</segtitle>
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| 38 |
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| 39 | <seglistitem>
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[fb386e0] | 40 | <seg>&libffi-fin-sbu;</seg>
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| 41 | <seg>&libffi-fin-du;</seg>
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[b0aabe0] | 42 | </seglistitem>
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| 43 | </segmentedlist>
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| 44 |
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| 45 | </sect2>
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| 46 |
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| 47 | <sect2 role="installation">
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[e03d5e49] | 48 | <title>Installation of Libffi</title>
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[b0aabe0] | 49 |
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[8dbae30] | 50 | <note>
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[e9c46b3] | 51 | <para>Like GMP, Libffi builds with optimizations specific
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[ab7af9e] | 52 | to the processor in use. If building for another system, change the
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| 53 | value of the <parameter>--with-gcc-arch=</parameter> parameter in the
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| 54 | following command to an architecture name fully implemented by the
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| 55 | CPU on that system.
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[20d6b70] | 56 | If this is not done, all applications that link to
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| 57 | <filename class='libraryfile'>libffi</filename> will trigger
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[8dbae30] | 58 | Illegal Operation Errors.</para>
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| 59 | </note>
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[6a156bab] | 60 |
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[e9c46b3] | 61 | <para>Prepare Libffi for compilation:</para>
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[b0aabe0] | 62 |
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[3ba82a8] | 63 | <screen><userinput remap="configure">./configure --prefix=/usr \
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| 64 | --disable-static \
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[0f4ec34] | 65 | --with-gcc-arch=native</userinput></screen>
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[b8b65b7] | 66 |
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| 67 | <variablelist>
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| 68 | <title>The meaning of the configure option:</title>
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| 69 |
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| 70 | <varlistentry>
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| 71 | <term><parameter>--with-gcc-arch=native</parameter></term>
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| 72 | <listitem>
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[77d2cd8d] | 73 | <para>Ensure GCC optimizes for the current system. If this
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[b8b65b7] | 74 | is not specified, the system is guessed and the code generated
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[e9c46b3] | 75 | may not be correct. If the generated code
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[d672ab7] | 76 | will be copied from the native system to a less capable
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| 77 | system, use the less capable system as a parameter. For details
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| 78 | about alternative system types, see <ulink
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[2c53f52] | 79 | url='https://gcc.gnu.org/onlinedocs/gcc-&gcc-version;/gcc/x86-Options.html'>
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[77d2cd8d] | 80 | the x86 options in the GCC manual</ulink>.</para>
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[b8b65b7] | 81 | </listitem>
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| 82 | </varlistentry>
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| 83 | </variablelist>
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[b0aabe0] | 84 |
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| 85 | <para>Compile the package:</para>
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| 86 |
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| 87 | <screen><userinput remap="make">make</userinput></screen>
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| 88 |
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| 89 | <para>To test the results, issue:</para>
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| 90 |
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| 91 | <screen><userinput remap="test">make check</userinput></screen>
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| 92 |
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| 93 | <para>Install the package:</para>
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| 94 |
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| 95 | <screen><userinput remap="install">make install</userinput></screen>
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| 96 |
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| 97 | </sect2>
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| 98 |
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| 99 | <sect2 id="contents-libffi" role="content">
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[e03d5e49] | 100 | <title>Contents of Libffi</title>
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[b0aabe0] | 101 |
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| 102 | <segmentedlist>
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| 103 | <segtitle>Installed library</segtitle>
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| 104 |
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| 105 | <seglistitem>
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| 106 | <seg>libffi.so</seg>
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| 107 | </seglistitem>
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| 108 | </segmentedlist>
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| 109 |
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| 110 | <variablelist>
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| 111 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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| 112 | <?dbfo list-presentation="list"?>
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| 113 | <?dbhtml list-presentation="table"?>
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| 114 |
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| 115 | <varlistentry id="libffi">
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| 116 | <term><filename class="libraryfile">libffi</filename></term>
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| 117 | <listitem>
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[e9c46b3] | 118 | <para>Contains the foreign function interface API functions</para>
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[b0aabe0] | 119 | <indexterm zone="ch-system-libffi">
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| 120 | <primary sortas="c-libffi">libffi</primary>
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| 121 | </indexterm>
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| 122 | </listitem>
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| 123 | </varlistentry>
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| 124 | </variablelist>
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| 125 |
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| 126 | </sect2>
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| 127 |
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| 128 | </sect1>
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| 129 |
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