Merge commit 'upstream/1.2.0.d20091224'

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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.
+-->
+<cvar name="RPATH">
+<summary>
+A list of paths to search for shared libraries when running programs.
+Currently only used in the GNU (gnulink),
+IRIX (sgilink) and Sun (sunlink) linkers.
+Ignored on platforms and toolchains that don't support it.
+Note that the paths added to RPATH
+are not transformed by
+&scons;
+in any way:  if you want an absolute
+path, you must make it absolute yourself.
+</summary>
+</cvar>
+
+<cvar name="_RPATH">
+<summary>
+An automatically-generated construction variable
+containing the rpath flags to be used when linking
+a program with shared libraries.
+The value of &cv-_RPATH; is created
+by appending &cv-RPATHPREFIX; and &cv-RPATHSUFFIX;
+to the beginning and end
+of each directory in &cv-RPATH;.
+</summary>
+</cvar>
+
+<cvar name="RPATHPREFIX">
+<summary>
+The prefix used to specify a directory to be searched for
+shared libraries when running programs.
+This will be appended to the beginning of each directory
+in the &cv-RPATH; construction variable
+when the &cv-_RPATH; variable is automatically generated.
+</summary>
+</cvar>
+
+<cvar name="RPATHSUFFIX">
+<summary>
+The suffix used to specify a directory to be searched for
+shared libraries when running programs.
+This will be appended to the end of each directory
+in the &cv-RPATH; construction variable
+when the &cv-_RPATH; variable is automatically generated.
+</summary>
+</cvar>