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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
<!ENTITY % general-entities SYSTEM "../general.ent">
%general-entities;
]>
<sect1 id="ch-system-flex" role="wrap">
<?dbhtml filename="flex.html"?>
<sect1info condition="script">
<productname>flex</productname>
<productnumber>&flex-version;</productnumber>
<address>&flex-url;</address>
</sect1info>
<title>Flex-&flex-version;</title>
<indexterm zone="ch-system-flex">
<primary sortas="a-Flex">Flex</primary>
</indexterm>
<sect2 role="package">
<title/>
<para>The Flex package contains a utility for generating programs that
recognize patterns in text.</para>
<segmentedlist>
<segtitle>&buildtime;</segtitle>
<segtitle>&diskspace;</segtitle>
<seglistitem>
<seg>&flex-ch6-sbu;</seg>
<seg>&flex-ch6-du;</seg>
</seglistitem>
</segmentedlist>
</sect2>
<sect2 role="installation">
<title>Installation of Flex</title>
<para>Apply a patch that fixes a bug in the C++ scanner generator, that causes scanner compilation to fail when using GCC-&gcc-version;:</para>
<screen><userinput remap="pre">patch -Np1 -i ../&flex-gcc-patch;</userinput></screen>
<para>Prepare Flex for compilation:</para>
<screen><userinput remap="configure">./configure --prefix=/usr</userinput></screen>
<para>Compile the package:</para>
<screen><userinput remap="make">make</userinput></screen>
<para>To test the results (about 0.5 SBU), issue:</para>
<screen><userinput remap="test">make check</userinput></screen>
<para>Install the package:</para>
<screen><userinput remap="install">make install</userinput></screen>
<para>There are some packages that expect to find the
<filename class="libraryfile">lex</filename> library in <filename
class="directory">/usr/lib</filename>. Create a symlink to account for
this:</para>
<screen><userinput remap="install">ln -sv libfl.a /usr/lib/libl.a</userinput></screen>
<para>A few programs do not know about <command>flex</command> yet and
try to run its predecessor, <command>lex</command>. To support those
programs, create a wrapper script named <filename>lex</filename> that
calls <filename>flex</filename> in <command>lex</command> emulation
mode:</para>
<screen><userinput remap="install">cat > /usr/bin/lex << "EOF"
<literal>#!/bin/sh
# Begin /usr/bin/lex
exec /usr/bin/flex -l "$@"
# End /usr/bin/lex</literal>
EOF
chmod -v 755 /usr/bin/lex</userinput></screen>
<para>If desired, install the <filename>flex.pdf</filename> documentation
file:</para>
<screen><userinput remap="install">mkdir -v /usr/share/doc/flex-&flex-version;
cp -v doc/flex.pdf \
/usr/share/doc/flex-&flex-version;</userinput></screen>
</sect2>
<sect2 id="contents-flex" role="content">
<title>Contents of Flex</title>
<segmentedlist>
<segtitle>Installed programs</segtitle>
<segtitle>Installed libraries</segtitle>
<seglistitem>
<seg>flex and lex</seg>
<seg>libfl.a and libfl_pic.a</seg>
</seglistitem>
</segmentedlist>
<variablelist>
<bridgehead renderas="sect3">Short Descriptions</bridgehead>
<?dbfo list-presentation="list"?>
<?dbhtml list-presentation="table"?>
<varlistentry id="flex">
<term><command>flex</command></term>
<listitem>
<para>A tool for generating programs that recognize patterns in text;
it allows for the versatility to specify the rules for pattern-finding,
eradicating the need to develop a specialized program</para>
<indexterm zone="ch-system-flex flex">
<primary sortas="b-flex">flex</primary>
</indexterm>
</listitem>
</varlistentry>
<varlistentry id="lex">
<term><command>lex</command></term>
<listitem>
<para>A script that runs <command>flex</command> in
<command>lex</command> emulation mode</para>
<indexterm zone="ch-system-flex lex">
<primary sortas="b-lex">lex</primary>
</indexterm>
</listitem>
</varlistentry>
<varlistentry id="libfl.a">
<term><filename class="libraryfile">libfl.a</filename></term>
<listitem>
<para>The <filename class="libraryfile">flex</filename> library</para>
<indexterm zone="ch-system-flex libfl.a">
<primary sortas="c-libfl.a">libfl.a</primary>
</indexterm>
</listitem>
</varlistentry>
</variablelist>
</sect2>
</sect1>
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