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<?xml version='1.0'?>
<!DOCTYPE sconsdoc [
    <!ENTITY % scons SYSTEM "../scons.mod">
    %scons;
]>

<section id="sect-install"
         xmlns="http://www.scons.org/dbxsd/v1.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://www.scons.org/dbxsd/v1.0 http://www.scons.org/dbxsd/v1.0/scons.xsd">
<title>Installation</title>

<!--

  Copyright (c) 2001 - 2014 The SCons Foundation

  Permission is hereby granted, free of charge, to any person obtaining
  a copy of this software and associated documentation files (the
  "Software"), to deal in the Software without restriction, including
  without limitation the rights to use, copy, modify, merge, publish,
  distribute, sublicense, and/or sell copies of the Software, and to
  permit persons to whom the Software is furnished to do so, subject to
  the following conditions:

  The above copyright notice and this permission notice shall be included
  in all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
  KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
  WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

-->

<para>

  Initial installation of a new utility provides the first, lasting
  impression of how well the software is likely to perform. From the
  start, &SCons; has made clean installation a priority.

</para>

<section>
  <title>Version Control</title>

  <para>

    Distributing an application like &SCons; that depends
    on a package normally found in a library poses a
    problem. If the &scons; script and the &SCons; Build Engine
    are installed separately, it could be easy
    to introduce a version mismatch between the Build Engine
    installed in
    <filename>/usr/lib/python*/site-packages</filename>
    and the &scons; script installed in
    <filename>/usr/bin</filename>.
    Such a mismatch
    could possible mean exceptions that prevent builds, or even worse,
    silently unreliable builds.

  </para>

  <para>

    To reduce the possibility of a version mismatch,
    the &scons; script looks first for its
    imported modules in <filename>/usr/lib/scons-{version}/</filename>,
    then in <filename>/usr/lib/scons/</filename>,
    and then in the normal &PYTHONPATH; locations,
    including <filename>/usr/lib/python*/site-packages</filename>).
    Searching in a version-specific library directory first
    makes it convenient to install and use multiple
    side-by-side versions of &SCons;,
    which is sometimes important
    when verifying that a new version does not introduce any
    errors into the local build process.
    Searching next in an &SCons;-specific library directory
    makes it convenient for other software to find
    the &SCons; Build Engine without having to worry about
    installing separate copies for
    multiple versions of Python.

  </para>

</section>

<section>
  <title>Packages</title>

  <para>

    &SCons; is currently distributed in the following packages:

  </para>

  <table>
  <title></title>
  <tgroup cols="2">
    <tbody>

    <row valign="top">
      <entry>
        <literal>scons-</literal><emphasis>version</emphasis><literal>.tar.gz</literal>
      </entry>
      <entry><para>

        The traditional <literal>.tar.gz</literal> file,
        installable by running <filename>setup.py</filename>.

      </para></entry>
    </row>

    <row valign="top">
      <entry>
        <literal>scons-</literal><emphasis>version</emphasis><literal>.noarch.rpm</literal>
      </entry>
      <entry><para>

        An RPM file for typical installation.

      </para></entry>
    </row>

    <row valign="top">
      <entry>
        <literal>scons-</literal><emphasis>version</emphasis><literal>_all.deb</literal>
      </entry>
      <entry><para>

        A Debian package.

      </para></entry>
    </row>

    <row valign="top">
      <entry>
        <literal>scons-</literal><emphasis>version</emphasis><literal>.win32.exe</literal>
      </entry>
      <entry><para>

        A Windows installer.

      </para></entry>
    </row>

    <row valign="top">
      <entry>
        <literal>scons-</literal><emphasis>version</emphasis><literal>.src.rpm</literal>
      </entry>
      <entry><para>

        A source RPM file.

      </para></entry>
    </row>

    <row valign="top">
      <entry>
        <literal>scons-src-</literal><emphasis>version</emphasis><literal>.tar.gz</literal>
      </entry>
      <entry><para>

        A tarball of the &SCons; source tree,
        including the full set of regression tests.

      </para></entry>
    </row>

    </tbody>
  </tgroup>
  </table>

  <para>

    Like other software written in Python, &SCons; benefits greatly from
    the tremendous effort put into the <literal>distutils</literal> by
    Greg Ward and others. These take care of 90% of the work by making
    it almost trivial to generate the appropriate RPM files, Debian
    packages, and Windows installer.

  </para>

</section>

<section>
  <title>Default Builder Objects</title>

  <para>

    As part of the installation process, &SCons; runs a set of scripts
    that look for popular compilers and other tools and set up
    appropriate default &Builder; objects for the tools found. These
    &Builder; objects are then used to initialize the default &consenv;
    values.

  </para>

</section>

<section>
  <title>Default Scanner Objects</title>

  <para>

    Additionally, &SCons; comes with a stock set of &Scanner; objects
    for the various file types that it supports out of the box. Any
    unusal &Scanner; objects required for a specific tool will be
    detected at installation time and associated with the appropriate
    &Builder; object for the tool.

  </para>

</section>

</section>