mirror of
https://git.linuxfromscratch.org/lfs.git
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e0f902a7d0
git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@8606 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
141 lines
4.1 KiB
XML
141 lines
4.1 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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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-flex" role="wrap">
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<?dbhtml filename="flex.html"?>
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<sect1info condition="script">
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<productname>flex</productname>
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<productnumber>&flex-version;</productnumber>
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<address>&flex-url;</address>
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</sect1info>
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<title>Flex-&flex-version;</title>
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<indexterm zone="ch-system-flex">
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<primary sortas="a-Flex">Flex</primary>
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</indexterm>
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<sect2 role="package">
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<title/>
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<para>The Flex package contains a utility for generating programs that
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recognize patterns in text.</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>&flex-ch6-sbu;</seg>
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<seg>&flex-ch6-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 Flex</title>
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<para>Prepare Flex for compilation:</para>
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<screen><userinput remap="configure">./configure --prefix=/usr</userinput></screen>
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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 (about 0.5 SBU), 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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<para>There are some packages that expect to find the
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<filename class="libraryfile">lex</filename> library in <filename
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class="directory">/usr/lib</filename>. Create a symlink to account for
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this:</para>
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<screen><userinput remap="install">ln -sv libfl.a /usr/lib/libl.a</userinput></screen>
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<para>A few programs do not know about <command>flex</command> yet and
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try to run its predecessor, <command>lex</command>. To support those
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programs, create a wrapper script named <filename>lex</filename> that
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calls <filename>flex</filename> in <command>lex</command> emulation
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mode:</para>
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<screen><userinput remap="install">cat > /usr/bin/lex << "EOF"
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<literal>#!/bin/sh
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# Begin /usr/bin/lex
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exec /usr/bin/flex -l "$@"
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# End /usr/bin/lex</literal>
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EOF
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chmod -v 755 /usr/bin/lex</userinput></screen>
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</sect2>
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<sect2 id="contents-flex" role="content">
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<title>Contents of Flex</title>
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<segmentedlist>
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<segtitle>Installed programs</segtitle>
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<segtitle>Installed library</segtitle>
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<seglistitem>
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<seg>flex and lex</seg>
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<seg>libfl.a</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="flex">
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<term><command>flex</command></term>
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<listitem>
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<para>A tool for generating programs that recognize patterns in text;
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it allows for the versatility to specify the rules for pattern-finding,
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eradicating the need to develop a specialized program</para>
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<indexterm zone="ch-system-flex flex">
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<primary sortas="b-flex">flex</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="lex">
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<term><command>lex</command></term>
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<listitem>
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<para>A script that runs <command>flex</command> in
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<command>lex</command> emulation mode</para>
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<indexterm zone="ch-system-flex lex">
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<primary sortas="b-lex">lex</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="libfl.a">
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<term><filename class="libraryfile">libfl.a</filename></term>
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<listitem>
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<para>The <filename class="libraryfile">flex</filename> library</para>
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<indexterm zone="ch-system-flex libfl.a">
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<primary sortas="c-libfl.a">libfl.a</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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