Squashed 'cmake/' content from commit 2d25566

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

GetForceIncludeDefinitions.cmake

@@ -0,0 +1,44 @@
+# - Get the platform-appropriate flags to add to force inclusion of a file
+#
+# The most common use of this is to use a generated config.h-type file
+# placed out of the source tree in all files.
+#
+#  get_force_include_definitions(var forcedincludefiles...) -
+#   where var is the name of  your desired output variable, and everything
+#   else is a source file to forcibly include.
+#   a list item to be filtered.
+#
+# 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_force_include_definitions)
+	return()
+endif()
+set(__get_force_include_definitions YES)
+
+function(get_force_include_definitions var)
+	set(_flagprefix)
+	if(CMAKE_COMPILER_IS_GNUCXX)
+		set(_flag "-include")
+	elseif(MSVC)
+		set(_flag "/FI")
+	else()
+		message(SEND_ERROR "You don't seem to be using MSVC or GCC, but")
+		message(SEND_ERROR "the project called get_force_include_definitions.")
+		message(SEND_ERROR "Contact this project with the name of your")
+		message(FATAL_ERROR "compiler and preferably the flag to force includes")
+	endif()
+
+	set(_out)
+	foreach(_item ${ARGN})
+		list(APPEND _out "${_flag} \"${_item}\"")
+	endforeach()
+	set(${var} "${_out}" PARENT_SCOPE)
+endfunction()