Squashed 'cmake/' content from commit 2d25566

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

EnableExtraCompilerWarnings.cmake

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+# - Add flags to compile with extra warnings
+#
+#  enable_extra_compiler_warnings(<targetname>)
+#  globally_enable_extra_compiler_warnings() - to modify CMAKE_CXX_FLAGS, etc
+#    to change for all targets declared after the command, instead of per-command
+#
+#
+# Original Author:
+# 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(__enable_extra_compiler_warnings)
+	return()
+endif()
+set(__enable_extra_compiler_warnings YES)
+
+macro(_enable_extra_compiler_warnings_flags)
+	set(_flags)
+	if(MSVC)
+		option(COMPILER_WARNINGS_EXTREME
+			"Use compiler warnings that are probably overkill."
+			off)
+		mark_as_advanced(COMPILER_WARNINGS_EXTREME)
+		set(_flags "/W4")
+		if(COMPILER_WARNINGS_EXTREME)
+			set(_flags "${_flags} /Wall /wd4619 /wd4668 /wd4820 /wd4571 /wd4710")
+		endif()
+	elseif(CMAKE_COMPILER_IS_GNUCXX)
+		set(_flags "-W -Wall")
+	endif()
+endmacro()
+
+function(enable_extra_compiler_warnings _target)
+	_enable_extra_compiler_warnings_flags()
+	get_target_property(_origflags ${_target} COMPILE_FLAGS)
+	if(_origflags)
+		set_property(TARGET
+			${_target}
+			PROPERTY
+			COMPILE_FLAGS
+			"${_flags} ${_origflags}")
+	else()
+		set_property(TARGET
+			${_target}
+			PROPERTY
+			COMPILE_FLAGS
+			"${_flags}")
+	endif()
+
+endfunction()
+
+function(globally_enable_extra_compiler_warnings)
+	_enable_extra_compiler_warnings_flags()
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${_flags}" PARENT_SCOPE)
+	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${_flags}" PARENT_SCOPE)
+endfunction()