Add processor detection and automated optimal compiler option selection.

CMakeLists.txt

@@ -11,17 +11,6 @@ IF(WIN32)
 	SET(CMAKE_LIBRARY_PATH "${GNUWIN32}/lib")
 ENDIF(WIN32)
 
-# In single config builds:
-#IF(NOT CMAKE_CONFIGURATION_TYPES)
-#	IF (CMAKE_BUILD_TYPE MATCHES Debug)
-#		ADD_DEFINITIONS(-D_DEBUG)
-#	#	ADD_DEFINITIONS(-DDEBUG)
-#	ENDIF (CMAKE_BUILD_TYPE MATCHES Debug)
-#ELSE(NOT CMAKE_CONFIGURATION_TYPES)
-#	SET(CMAKE_CXX_FLAGS_DEBUG ${CMAKE_CXX_FLAGS_DEBUG} "-D_DEBUG")
-#	SET(CMAKE_CXX_FLAGS_RELEASE ${CMAKE_CXX_FLAGS_RELEASE} "-DNDEBUG")
-#ENDIF(NOT CMAKE_CONFIGURATION_TYPES)
-
 IF(MSVC)
 	# @@ Some of these might only be available in VC8.
 	# Code generation flags.
@@ -39,18 +28,10 @@ IF(MSVC)
 	ADD_DEFINITIONS(-D__SSE2__ -D__SSE__ -D__MMX__)
 ENDIF(MSVC)
 
-# Set custom gcc options for your system:
-IF(CMAKE_COMPILER_IS_GNUCXX)
-	#SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mfpmath=sse -mtune=i686 -msse3")
-	#SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=pentium4")
-
-	# ibook G4:
-	#SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mcpu=7450 -mtune=7450 -maltivec -mabi=altivec")
-
-	# powerpc:
-	#SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mcpu=powerpc")
-ENDIF(CMAKE_COMPILER_IS_GNUCXX)
-
+INCLUDE(${NV_CMAKE_DIR}/OptimalOptions.cmake)
+MESSAGE(STATUS "Setting optimal options")
+MESSAGE(STATUS "  Processor: ${NV_SYSTEM_PROCESSOR}")
+MESSAGE(STATUS "  Compiler Flags: ${CMAKE_CXX_FLAGS}")
 
 ADD_SUBDIRECTORY(src)
 

cmake/DetermineProcessor.cmake

@@ -0,0 +1,28 @@
+
+# Assume i586 by default.
+SET(NV_SYSTEM_PROCESSOR "i586")
+
+IF(UNIX)
+	FIND_PROGRAM(CMAKE_UNAME uname /bin /usr/bin /usr/local/bin )
+	IF(CMAKE_UNAME)
+		EXEC_PROGRAM(uname ARGS -p OUTPUT_VARIABLE NV_SYSTEM_PROCESSOR RETURN_VALUE val)
+
+		IF("${val}" GREATER 0 OR NV_SYSTEM_PROCESSOR STREQUAL "unknown")
+			EXEC_PROGRAM(uname ARGS -m OUTPUT_VARIABLE NV_SYSTEM_PROCESSOR RETURN_VALUE val)
+		ENDIF("${val}" GREATER 0 OR NV_SYSTEM_PROCESSOR STREQUAL "unknown")
+
+		# processor may have double quote in the name, and that needs to be removed
+		STRING(REGEX REPLACE "\"" "" NV_SYSTEM_PROCESSOR "${NV_SYSTEM_PROCESSOR}")
+		STRING(REGEX REPLACE "/" "_" NV_SYSTEM_PROCESSOR "${NV_SYSTEM_PROCESSOR}")
+	ENDIF(CMAKE_UNAME)
+
+	# Get extended processor information with:
+	# `cat /proc/cpuinfo`
+
+ELSE(UNIX)
+  IF(WIN32)
+    SET (NV_SYSTEM_PROCESSOR "$ENV{PROCESSOR_ARCHITECTURE}")
+  ENDIF(WIN32)
+ENDIF(UNIX)
+
+

cmake/OptimalOptions.cmake

@@ -0,0 +1,26 @@
+
+INCLUDE(${NV_CMAKE_DIR}/DetermineProcessor.cmake)
+
+# Set optimal options for gcc:
+IF(CMAKE_COMPILER_IS_GNUCXX)
+
+	IF(NV_SYSTEM_PROCESSOR STREQUAL "i586")
+		SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=i586")
+	ENDIF(NV_SYSTEM_PROCESSOR STREQUAL "i586")
+
+	IF(NV_SYSTEM_PROCESSOR STREQUAL "i686")
+		SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=i686")
+		#SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mfpmath=sse -mtune=i686 -msse3")
+		#SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=pentium4")
+	ENDIF(NV_SYSTEM_PROCESSOR STREQUAL "i686")
+
+	IF(NV_SYSTEM_PROCESSOR STREQUAL "powerpc")
+		SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mcpu=powerpc -maltivec -mabi=altivec -mpowerpc-gfxopt")
+		
+		# ibook G4:
+		#SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mcpu=7450 -mtune=7450 -maltivec -mabi=altivec -mpowerpc-gfxopt")
+	ENDIF(NV_SYSTEM_PROCESSOR STREQUAL "powerpc")
+
+ENDIF(CMAKE_COMPILER_IS_GNUCXX)
+
+