Squashed 'cmake/' content from commit 2d25566

git-subtree-dir: cmake
git-subtree-split: 2d25566a1c5162ce3fd6bfc268d5665de182af89

GetSubprojectStatus.cmake

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+# - Returns whether the current project is on its own or within another project's build
+#
+#  get_subproject_status(<resultvar>) - resultvar will be YES if we are
+#   included in another project, or NO if we are being built separately
+#
+# Requires CMake 2.6 or newer (uses the 'function' command)
+#
+# Original Author:
+# 2009-2010 Ryan Pavlik <rpavlik@iastate.edu> <abiryan@ryand.net>
+# http://academic.cleardefinition.com
+# Iowa State University HCI Graduate Program/VRAC
+#
+#          Copyright Iowa State University 2009-2010
+# Distributed under the Boost Software License, Version 1.0.
+#    (See accompanying file LICENSE_1_0.txt or copy at
+#          http://www.boost.org/LICENSE_1_0.txt)
+
+if(__get_subproject_status)
+	return()
+endif()
+set(__get_subproject_status YES)
+
+function(get_subproject_status _var)
+	if("${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_CURRENT_SOURCE_DIR}")
+		# Base source dir is our source dir - we are top-level
+		set(${_var} NO PARENT_SCOPE)
+	else()
+		# Base source dir is not our source dir - we are a subproject
+		set(${_var} YES PARENT_SCOPE)
+	endif()
+endfunction()