source: BOOK/cross-tools/common/file.xml@ 495aba09

<?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-cross-tools-file" role="wrap">
  <?dbhtml filename="file.html"?>

  <title>File-&file-version;</title>

  <indexterm zone="ch-cross-tools-file">
    <primary sortas="a-File">File</primary>
    <secondary>cross tools</secondary>
  </indexterm>

  <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
  href="../../final-system/common/file.xml"
  xpointer="xpointer(//*[@role='package'])"/>

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

    <para>One method that <command>file</command> uses for identifying a given
    file is to run <quote>magic tests</quote>, where it compares the file's
    contents to data in <quote>magic files</quote>, which contain information
    about a number of standard file formats. When File is compiled, it will run
    <command>file -C</command> to combine the information from the
    magic files in its source tree into a single <filename>magic.mgc</filename>
    file, which it will use after it is installed. When we build File in 
    <xref linkend="chapter-temp-system"/>, it will be cross-compiled, so it
    will not be able to run the <command>file</command> program that it just
    built, which means that we need one that will run on the host system.</para>

    <para>Prepare File for compilation:</para>

<screen><userinput>./configure --prefix=/cross-tools --disable-static</userinput></screen>

    <variablelist>
      <title>The meaning of the configure options:</title>

      <varlistentry>
        <term><parameter>--prefix=/cross-tools</parameter></term>
        <listitem>
          <para>This tells the configure script to prepare to install the
          package in the <filename class="directory">/cross-tools</filename>
          directory.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><parameter>--disable-static</parameter></term>
        <listitem>
          <para>This tells the File package not to compile or install static
          libraries, which are not needed for the Cross-Tools</para>
        </listitem>
      </varlistentry>

    </variablelist>

    <para>Compile the package:</para>

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

    <para>Install the package:</para>

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

  </sect2>

  <sect2 role="content">
    <title/>

    <para>Details on this package are located in <xref
    linkend="contents-file" role="."/></para>

  </sect2>

</sect1>