better macro for getting the blender version from BKE_blender.h, also re-run...

better macro for getting the blender version from BKE_blender.h, also re-run CMake if BKE_blender.h changes.

build_files/cmake/macros.cmake

@@ -332,35 +332,39 @@ macro(ADD_CHECK_CXX_COMPILER_FLAG
 endmacro()
 
 macro(get_blender_version)
-	file(READ ${CMAKE_SOURCE_DIR}/source/blender/blenkernel/BKE_blender.h CONTENT)
-	string(REGEX REPLACE "\n" ";" CONTENT "${CONTENT}")
-	string(REGEX REPLACE "\t" ";" CONTENT "${CONTENT}")
-	string(REGEX REPLACE " " ";" CONTENT "${CONTENT}")
-
-	foreach(ITEM ${CONTENT})
-		if(LASTITEM MATCHES "^BLENDER_VERSION$")
-			MATH(EXPR BLENDER_VERSION_MAJOR "${ITEM} / 100")
-			MATH(EXPR BLENDER_VERSION_MINOR "${ITEM} % 100")
-			set(BLENDER_VERSION "${BLENDER_VERSION_MAJOR}.${BLENDER_VERSION_MINOR}")
+	# So cmake depends on BKE_blender.h, beware of inf-loops!
+	CONFIGURE_FILE(${CMAKE_SOURCE_DIR}/source/blender/blenkernel/BKE_blender.h ${CMAKE_BINARY_DIR}/source/blender/blenkernel/BKE_blender.h.done)
+
+	file(STRINGS ${CMAKE_SOURCE_DIR}/source/blender/blenkernel/BKE_blender.h _contents REGEX "^#define[ \t]+BLENDER_.*$")
+
+	string(REGEX REPLACE ".*#define[ \t]+BLENDER_VERSION[ \t]+([0-9]+).*" "\\1" _out_version "${_contents}")
+	string(REGEX REPLACE ".*#define[ \t]+BLENDER_SUBVERSION[ \t]+([0-9]+).*" "\\1" _out_subversion "${_contents}")
+	string(REGEX REPLACE ".*#define[ \t]+BLENDER_VERSION_CHAR[ \t]+([a-z]+).*" "\\1" _out_version_char "${_contents}")
+	string(REGEX REPLACE ".*#define[ \t]+BLENDER_VERSION_CYCLE[ \t]+([a-z]+).*" "\\1" _out_version_cycle "${_contents}")
+
+	if(NOT ${_out_version} MATCHES "[0-9]+")
+		message(FATAL_ERROR "Version parsing failed for BLENDER_VERSION")
 	endif()
 
-		if(LASTITEM MATCHES "^BLENDER_SUBVERSION$")
-			set(BLENDER_SUBVERSION ${ITEM})
+	if(NOT ${_out_subversion} MATCHES "[0-9]+")
+		message(FATAL_ERROR "Version parsing failed for BLENDER_SUBVERSION")
 	endif()
 
-		if(LASTITEM MATCHES "^BLENDER_MINVERSION$")
-			MATH(EXPR BLENDER_MINVERSION_MAJOR "${ITEM} / 100")
-			MATH(EXPR BLENDER_MINVERSION_MINOR "${ITEM} % 100")
-			set(BLENDER_MINVERSION "${BLENDER_MINVERSION_MAJOR}.${BLENDER_MINVERSION_MINOR}")
+	if(NOT ${_out_version_char} MATCHES "[a-z]+")
+		message(FATAL_ERROR "Version parsing failed for BLENDER_VERSION_CHAR")
 	endif()
 
-		if(LASTITEM MATCHES "^BLENDER_MINSUBVERSION$")
-			set(BLENDER_MINSUBVERSION ${ITEM})
+	if(NOT ${_out_version_cycle} MATCHES "[a-z]+")
+		message(FATAL_ERROR "Version parsing failed for BLENDER_VERSION_CYCLE")
 	endif()
 
-		set(LASTITEM ${ITEM})
-	endforeach()
+	MATH(EXPR BLENDER_VERSION_MAJOR "${_out_version} / 100")
+	MATH(EXPR BLENDER_VERSION_MINOR "${_out_version} % 100")
+	set(BLENDER_VERSION "${BLENDER_VERSION_MAJOR}.${BLENDER_VERSION_MINOR}")
+
+	set(BLENDER_SUBVERSION ${_out_subversion})
+	set(BLENDER_VERSION_CHAR ${_out_version_char})
+	set(BLENDER_VERSION_CYCLE ${_out_version_cycle})
 
-	# message(STATUS "Version major: ${BLENDER_VERSION_MAJOR}, Version minor: ${BLENDER_VERSION_MINOR}, Subversion: ${BLENDER_SUBVERSION}, Version: ${BLENDER_VERSION}")
-	# message(STATUS "Minversion major: ${BLENDER_MINVERSION_MAJOR}, Minversion minor: ${BLENDER_MINVERSION_MINOR}, MinSubversion: ${BLENDER_MINSUBVERSION}, Minversion: ${BLENDER_MINVERSION}")
+	# message(STATUS "Version (Internal): ${BLENDER_VERSION}.${BLENDER_SUBVERSION}, Version (external): ${BLENDER_VERSION}${BLENDER_VERSION_CHAR}-${BLENDER_VERSION_CYCLE}")
 endmacro()