add cmake modules

Author: ideal

cmake/FindBison.cmake

@@ -0,0 +1,20 @@
+FIND_PROGRAM(BISON_EXECUTABLE NAMES bison bison.exe)
+
+IF(BISON_EXECUTABLE)
+    SET(BISON_FOUND TRUE)
+
+    EXECUTE_PROCESS(COMMAND ${BISON_EXECUTABLE} --version
+        OUTPUT_VARIABLE _BISON_VERSION
+    )
+    string (REGEX MATCH "[0-9]+\\.[0-9]+(\\.[0-9]+)*" BISON_VERSION "${_BISON_VERSION}")
+ENDIF(BISON_EXECUTABLE)
+
+IF(BISON_FOUND)
+    IF(NOT Bison_FIND_QUIETLY)
+        MESSAGE(STATUS "Found Bison: ${BISON_EXECUTABLE}, version: ${BISON_VERSION}")
+    ENDIF(NOT Bison_FIND_QUIETLY)
+ELSE(BISON_FOUND)
+    IF(Bison_FIND_REQUIRED)
+        MESSAGE(FATAL_ERROR "Could not find Bison")
+    ENDIF(Bison_FIND_REQUIRED)
+ENDIF(BISON_FOUND)

cmake/FindFlex.cmake

@@ -0,0 +1,20 @@
+FIND_PROGRAM(FLEX_EXECUTABLE NAMES flex flex.exe )
+
+IF(FLEX_EXECUTABLE)
+    SET(FLEX_FOUND TRUE)
+
+    EXECUTE_PROCESS(COMMAND ${FLEX_EXECUTABLE} --version
+        OUTPUT_VARIABLE _FLEX_VERSION
+    )
+    string (REGEX MATCH "[0-9]+\\.[0-9]+\\.[0-9]+" FLEX_VERSION "${_FLEX_VERSION}")
+ENDIF(FLEX_EXECUTABLE)
+
+IF(FLEX_FOUND)
+    IF(NOT Flex_FIND_QUIETLY)
+        MESSAGE(STATUS "Found Flex: ${FLEX_EXECUTABLE}, version: ${FLEX_VERSION}")
+    ENDIF(NOT Flex_FIND_QUIETLY)
+ELSE(FLEX_FOUND)
+    IF(Flex_FIND_REQUIRED)
+        MESSAGE(FATAL_ERROR "Could not find Flex")
+    ENDIF(Flex_FIND_REQUIRED)
+ENDIF(FLEX_FOUND)