lfs-book/chapter05/expect.xml

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<sect1 id="ch-tools-expect" role="wrap">
<title>Expect-&expect-version;</title>
<?dbhtml filename="expect.html"?>

<indexterm zone="ch-tools-expect"><primary sortas="a-Expect">Expect</primary></indexterm>

<sect2 role="package"><title/>
<para>The Expect package contains a program for carrying out scripted dialogues
with other interactive programs.</para>

<segmentedlist>
<segtitle>&buildtime;</segtitle>
<segtitle>&diskspace;</segtitle>
<seglistitem><seg>0.1 SBU</seg><seg>4.0 MB</seg></seglistitem>
</segmentedlist>

<segmentedlist>
<segtitle>&dependencies;</segtitle>
<seglistitem><seg>Bash, Binutils, Coreutils, Diffutils,
GCC, Glibc, Grep, Make, Sed, and Tcl</seg></seglistitem>
</segmentedlist>
</sect2>

<sect2 role="installation">
<title>Installation of Expect</title>

<para>First, fix a bug that can result in false failures during the GCC test
suite run:</para>

<screen><userinput>patch -Np1 -i ../&expect-spawn-patch;</userinput></screen>

<para>Now prepare Expect for compilation:</para>

<screen><userinput>./configure --prefix=/tools --with-tcl=/tools/lib \
   --with-tclinclude=$TCLPATH --with-x=no</userinput></screen>

<para>The meaning of the configure options:</para>

<variablelist>
<varlistentry>
<term><parameter>--with-tcl=/tools/lib</parameter></term>
<listitem><para>This ensures that the configure script finds the Tcl installation in
the temporary tools location instead of possibly locating an existing
one on the host system.</para></listitem>
</varlistentry>

<varlistentry>
<term><parameter>--with-tclinclude=$TCLPATH</parameter></term>
<listitem><para>This explicitly tells Expect where to find Tcl's source
directory and internal headers. Using this option avoids conditions
where <command>configure</command> fails because it cannot automatically
discover the location of the Tcl source directory.</para></listitem>
</varlistentry>

<varlistentry>
<term><parameter>--with-x=no</parameter></term>
<listitem><para>This tells the configure script not to search for Tk
(the Tcl GUI component) or the X Window System libraries, both of
which may reside on the host system but will not exist in the temporary
environment.</para></listitem>
</varlistentry>
</variablelist>

<para>Build the package:</para>

<screen><userinput>make</userinput></screen>

<para>To test the results, issue: <userinput>make test</userinput>.
Note that the Expect test suite is known to experience failures under
certain host conditions that are not within our control. Therefore,
test suite failures here are not surprising and are not considered
critical.</para>

<para>Install the package:</para>

<screen><userinput>make SCRIPTS="" install</userinput></screen>

<para>The meaning of the make parameter:</para>

<variablelist>
<varlistentry>
<term><parameter>SCRIPTS=""</parameter></term>
<listitem><para>This prevents installation of the supplementary expect
scripts, which are not needed.</para></listitem>
</varlistentry>
</variablelist>

<para>Now remove the <envar>TCLPATH</envar> variable:</para>

<screen><userinput>unset TCLPATH</userinput></screen>

<para>The source directories of both Tcl and Expect can now be removed.</para>

</sect2>

<sect2 id="contents-expect" role="content"><title>Contents of Expect</title>

<segmentedlist>
<segtitle>Installed program</segtitle>
<segtitle>Installed library</segtitle>
<seglistitem><seg>expect</seg><seg>libexpect-5.42.a</seg></seglistitem>
</segmentedlist>

<variablelist><bridgehead renderas="sect3">Short Descriptions</bridgehead>
<?dbfo list-presentation="list"?>
<?dbhtml list-presentation="table"?>

<varlistentry id="expect">
<term><command>expect</command></term>
<listitem>
<para>Communicates with other interactive
programs according to a script</para>
<indexterm zone="ch-tools-expect expect"><primary sortas="b-expect">expect</primary></indexterm>
</listitem>
</varlistentry>

<varlistentry id="libexpect">
<term><filename class="libraryfile">libexpect-5.42.a</filename></term>
<listitem>
<para>Contains functions that allow Expect to be used as a Tcl extension or to
be used directly from C or C++ (without Tcl)</para>
<indexterm zone="ch-tools-expect libexpect"><primary
sortas="c-libexpect-5.42">libexpect-5.42</primary></indexterm>
</listitem>
</varlistentry>
</variablelist>

</sect2>

</sect1>