[673b0d8] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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| 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
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| 3 | <!ENTITY % general-entities SYSTEM "../general.ent">
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| 4 | %general-entities;
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| 5 | ]>
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[3be4d97] | 6 | <sect1 id="ch-system-flex" xreflabel="Flex">
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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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[5888299] | 12 | <para>The Flex package contains a utility for generating programs that
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| 13 | recognize patterns in text.</para>
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| 14 |
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[673b0d8] | 15 | <screen>&buildtime; 0.1 SBU
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| 16 | &diskspace; 3.4 MB</screen>
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| 17 |
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| 18 | <para>Flex installation depends on: Bash, Binutils, Bison, Coreutils, Diffutils,
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| 19 | GCC, Gettext, Glibc, Grep, M4, Make, Sed.</para>
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[3554fa3a] | 20 |
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[73aedd1d] | 21 |
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| 22 |
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| 23 | <sect2>
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| 24 | <title>Installation of Flex</title>
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| 25 |
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| 26 | <para>Prepare Flex for compilation:</para>
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| 27 |
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| 28 | <screen><userinput>./configure --prefix=/usr</userinput></screen>
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| 29 |
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| 30 | <para>Compile the package:</para>
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| 31 |
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| 32 | <screen><userinput>make</userinput></screen>
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| 33 |
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[673b0d8] | 34 | <para>To test the results, issue:
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[8a5f906] | 35 | <userinput>make bigcheck</userinput>.</para>
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[73aedd1d] | 36 |
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[673b0d8] | 37 | <para>Now install the package:</para>
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[73aedd1d] | 38 |
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| 39 | <screen><userinput>make install</userinput></screen>
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| 40 |
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[4248b0e] | 41 | <para>There are some packages that expect to find the <emphasis>lex</emphasis>
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| 42 | library in <filename>/usr/lib</filename>. Create a symlink to account for
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| 43 | this:</para>
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[73aedd1d] | 44 |
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| 45 | <screen><userinput>ln -s libfl.a /usr/lib/libl.a</userinput></screen>
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| 46 |
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[90e3cb3] | 47 | <para>A few programs don't know about <command>flex</command> yet and try
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| 48 | to run its predecessor <command>lex</command>. To support those programs,
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[4248b0e] | 49 | create a wrapper script named <filename>lex</filename> that calls
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| 50 | <command>flex</command> in <emphasis>lex</emphasis> emulation mode:</para>
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[73aedd1d] | 51 |
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| 52 | <screen><userinput>cat > /usr/bin/lex << "EOF"</userinput>
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| 53 | #!/bin/sh
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| 54 | # Begin /usr/bin/lex
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| 55 |
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| 56 | exec /usr/bin/flex -l "$@"
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| 57 |
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| 58 | # End /usr/bin/lex
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| 59 | <userinput>EOF
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| 60 | chmod 755 /usr/bin/lex</userinput></screen>
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| 61 |
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| 62 | </sect2>
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[6370fa6] | 63 |
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[5888299] | 64 |
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[673b0d8] | 65 | <sect2 id="contents-flex"><title>Contents of Flex</title>
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| 66 |
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| 67 | <para><emphasis>Installed programs</emphasis>: flex, flex++ (link to flex)
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| 68 | and lex</para>
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| 69 |
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| 70 | <para><emphasis>Installed library</emphasis>: libfl.a</para>
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| 71 |
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| 72 | </sect2>
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| 73 |
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| 74 |
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| 75 | <sect2><title>Short descriptions</title>
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[73aedd1d] | 76 |
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[673b0d8] | 77 | <indexterm zone="ch-system-flex flex"><primary sortas="b-flex">flex</primary></indexterm>
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| 78 | <para id="flex"><command>flex</command> is a tool for generating programs that
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| 79 | recognize patterns in text. Pattern recognition is useful in many applications.
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| 80 | From a set of rules on what to look for, flex makes a program that looks for
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| 81 | those patterns. The reason to use flex is that it is much easier to specify
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| 82 | the rules for a pattern-finding program than to write the program.</para>
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| 83 |
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| 84 | <indexterm zone="ch-system-flex flex-"><primary sortas="b-flex++">flex++</primary></indexterm>
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| 85 | <para id="flex-"><command>flex++</command> invokes a version of flex that is used
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| 86 | exclusively for C++ scanners.</para>
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| 87 |
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| 88 | <indexterm zone="ch-system-flex libfl.a"><primary sortas="c-libfl.a">libfl.a</primary></indexterm>
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| 89 | <para id="libfl.a"><command>libfl.a</command> is the flex library.</para>
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| 90 |
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| 91 | </sect2>
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| 92 |
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| 93 |
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| 94 |
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| 95 | </sect1>
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