Merge commit 'upstream/1.2.0.d20091224'

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diff --git a/src/engine/SCons/Tool/m4.xml b/src/engine/SCons/Tool/m4.xml
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+<!--
+Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 The SCons Foundation
+
+This file is processed by the bin/SConsDoc.py module.
+See its __doc__ string for a discussion of the format.
+-->
+<tool name="m4">
+<summary>
+Sets construction variables for the &m4; macro processor.
+</summary>
+<sets>
+M4
+M4FLAGS
+M4COM
+</sets>
+<uses>
+M4COMSTR
+</uses>
+</tool>
+
+<builder name="M4">
+<summary>
+Builds an output file from an M4 input file.
+This uses a default &cv-link-M4FLAGS; value of
+<option>-E</option>,
+which considers all warnings to be fatal
+and stops on the first warning
+when using the GNU version of m4.
+Example:
+
+<example>
+env.M4(target = 'foo.c', source = 'foo.c.m4')
+</example>
+</summary>
+</builder>
+
+<cvar name="M4">
+<summary>
+The M4 macro preprocessor.
+</summary>
+</cvar>
+
+<cvar name="M4COM">
+<summary>
+The command line used to pass files through the M4 macro preprocessor.
+</summary>
+</cvar>
+
+<cvar name="M4COMSTR">
+<summary>
+The string displayed when
+a file is passed through the M4 macro preprocessor.
+If this is not set, then &cv-link-M4COM; (the command line) is displayed.
+</summary>
+</cvar>
+
+<cvar name="M4FLAGS">
+<summary>
+General options passed to the M4 macro preprocessor.
+</summary>
+</cvar>