[673b0d8] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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[1770019] | 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
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[673b0d8] | 3 | <!ENTITY % general-entities SYSTEM "../general.ent">
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| 4 | %general-entities;
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| 5 | ]>
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[81fd230] | 6 | <sect1 id="ch-system-flex" role="wrap">
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[673b0d8] | 7 | <title>Flex-&flex-version;</title>
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| 8 | <?dbhtml filename="flex.html"?>
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| 9 |
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| 10 | <indexterm zone="ch-system-flex"><primary sortas="a-Flex">Flex</primary></indexterm>
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[6370fa6] | 11 |
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[a001133] | 12 | <sect2 role="package"><title/>
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[81fd230] | 13 | <para>The Flex package contains a utility for generating programs that
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| 14 | recognize patterns in text.</para>
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[5888299] | 15 |
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[a001133] | 16 | <segmentedlist>
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| 17 | <segtitle>&buildtime;</segtitle>
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| 18 | <segtitle>&diskspace;</segtitle>
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[fc1024a] | 19 | <seglistitem><seg>0.1 SBU</seg><seg>22.5 MB</seg></seglistitem>
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[a001133] | 20 | </segmentedlist>
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[673b0d8] | 21 |
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[81fd230] | 22 | <segmentedlist>
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[45992ae] | 23 | <segtitle>&dependencies;</segtitle>
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[81fd230] | 24 | <seglistitem><seg>Bash, Binutils, Bison, Coreutils, Diffutils,
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| 25 | GCC, Gettext, Glibc, Grep, M4, Make, and Sed</seg></seglistitem>
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| 26 | </segmentedlist>
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[a001133] | 27 | </sect2>
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[3554fa3a] | 28 |
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[a001133] | 29 | <sect2 role="installation">
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[73aedd1d] | 30 | <title>Installation of Flex</title>
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| 31 |
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[81fd230] | 32 | <para>Flex contains several known bugs. Fix these with the following patch:</para>
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[9dfc02f] | 33 |
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[6982a04] | 34 | <screen><userinput>patch -Np1 -i ../flex-&flex-version;-debian_fixes-3.patch</userinput></screen>
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[9dfc02f] | 35 |
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[81fd230] | 36 | <para>The GNU autotools detects that the Flex source code has been
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[37428334] | 37 | modified by the previous patch and tries to update the man page
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[81fd230] | 38 | accordingly. This does not work correctly on many systems, and the
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| 39 | default page is fine, so make sure it does not get regenerated:</para>
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[9dfc02f] | 40 |
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[2def124] | 41 | <screen><userinput>touch doc/flex.1</userinput></screen>
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[9dfc02f] | 42 |
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[81fd230] | 43 | <para>Prepare Flex for compilation:</para>
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[73aedd1d] | 44 |
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| 45 | <screen><userinput>./configure --prefix=/usr</userinput></screen>
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| 46 |
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| 47 | <para>Compile the package:</para>
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| 48 |
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| 49 | <screen><userinput>make</userinput></screen>
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| 50 |
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[673b0d8] | 51 | <para>To test the results, issue:
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[9dfc02f] | 52 | <userinput>make check</userinput>.</para>
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[73aedd1d] | 53 |
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[81fd230] | 54 | <para>Install the package:</para>
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[73aedd1d] | 55 |
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| 56 | <screen><userinput>make install</userinput></screen>
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| 57 |
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[81fd230] | 58 | <para>There are some packages that expect to find the
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| 59 | <filename class="libraryfile">lex</filename> library in <filename
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| 60 | class="directory">/usr/lib</filename>. Create a symlink to account for
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| 61 | this:</para>
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[73aedd1d] | 62 |
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| 63 | <screen><userinput>ln -s libfl.a /usr/lib/libl.a</userinput></screen>
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| 64 |
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[81fd230] | 65 | <para>A few programs do not know about <command>flex</command> yet and
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| 66 | try to run its predecessor, <command>lex</command>. To support those
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| 67 | programs, create a wrapper script named <filename>lex</filename> that
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| 68 | calls <filename>flex</filename> in <command>lex</command> emulation mode:</para>
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[73aedd1d] | 69 |
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[d72e04a] | 70 | <screen><userinput>cat > /usr/bin/lex << "EOF"
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| 71 | <literal>#!/bin/sh
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[73aedd1d] | 72 | # Begin /usr/bin/lex
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| 73 |
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| 74 | exec /usr/bin/flex -l "$@"
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| 75 |
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[d72e04a] | 76 | # End /usr/bin/lex</literal>
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| 77 | EOF
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[73aedd1d] | 78 | chmod 755 /usr/bin/lex</userinput></screen>
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| 79 |
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| 80 | </sect2>
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[6370fa6] | 81 |
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[5888299] | 82 |
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[c6cb3aa] | 83 | <sect2 id="contents-flex" role="content"><title>Contents of Flex</title>
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[673b0d8] | 84 |
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[81fd230] | 85 | <segmentedlist>
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| 86 | <segtitle>Installed programs</segtitle>
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| 87 | <segtitle>Installed library</segtitle>
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| 88 | <seglistitem><seg>flex, flex++ (link to flex), and lex</seg>
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| 89 | <seg>libfl.a</seg></seglistitem>
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| 90 | </segmentedlist>
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| 91 |
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| 92 | <variablelist><bridgehead renderas="sect3">Short Descriptions</bridgehead>
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| 93 | <?dbfo list-presentation="list"?>
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[8f97096] | 94 | <?dbhtml list-presentation="table"?>
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[81fd230] | 95 |
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| 96 | <varlistentry id="flex">
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| 97 | <term><command>flex</command></term>
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| 98 | <listitem>
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| 99 | <para>A tool for generating programs that recognize patterns in text;
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| 100 | it allows for the versatility to specify the rules for
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| 101 | pattern-finding, eradicating the need to develop a specialized
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| 102 | program</para>
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| 103 | <indexterm zone="ch-system-flex flex"><primary sortas="b-flex">flex</primary></indexterm>
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| 104 | </listitem>
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| 105 | </varlistentry>
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| 106 |
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| 107 | <varlistentry id="flex-">
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| 108 | <term><command>flex++</command></term>
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| 109 | <listitem>
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| 110 | <para>Invokes a version of <command>flex</command> that is used exclusively for C++ scanners</para>
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| 111 | <indexterm zone="ch-system-flex flex-"><primary sortas="b-flex++">flex++</primary></indexterm>
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| 112 | </listitem>
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| 113 | </varlistentry>
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| 114 |
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| 115 | <varlistentry id="lex">
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| 116 | <term><command>lex</command></term>
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| 117 | <listitem>
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[90b56f5] | 118 | <para>A script that runs <command>flex</command> in <command>lex</command>
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[81fd230] | 119 | emulation mode</para>
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| 120 | <indexterm zone="ch-system-flex lex"><primary sortas="b-lex">lex</primary></indexterm>
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| 121 | </listitem>
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| 122 | </varlistentry>
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| 123 |
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| 124 | <varlistentry id="libfl.a">
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| 125 | <term><filename class="libraryfile">libfl.a</filename></term>
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| 126 | <listitem>
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| 127 | <para>The <filename class="libraryfile">flex</filename> library</para>
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| 128 | <indexterm zone="ch-system-flex libfl.a"><primary sortas="c-libfl.a">libfl.a</primary></indexterm>
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| 129 | </listitem>
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| 130 | </varlistentry>
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| 131 | </variablelist>
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[673b0d8] | 132 |
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| 133 | </sect2>
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| 134 |
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| 135 | </sect1>
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[81fd230] | 136 |
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