Add two commonly used modules. First one checks if the function exists, the second one checks the size of type

1 files changed, 21 insertions, 0 deletions

diff --git a/Modules/CheckSizeOf.cmake b/Modules/CheckSizeOf.cmake
new file mode 100644
index 0000000000..8f1b122d7b
--- /dev/null
+++ b/Modules/CheckSizeOf.cmake
@@ -0,0 +1,21 @@
+#
+# Check if the type exists and determine size of type.  if the type
+# exists, the size will be stored to the variable.
+#
+# CHECK_TYPE_SIZE - macro which checks the size of type
+# VARIABLE - variable to store size if the type exists.
+#
+
+MACRO(CHECK_TYPE_SIZE TYPE VARIABLE)
+  TRY_RUN(RUN_RESULT COMPILE_OK 
+          ${PROJECT_BINARY_DIR}
+          ${CMAKE_ROOT}/Modules/CheckSizeOf.c
+          COMPILE_DEFINITIONS -DCHECK_SIZE_OF="${TYPE}"
+          OUTPUT_VARIABLE OUTPUT)
+  IF(COMPILE_OK)
+    SET(${VARIABLE} ${RUN_RESULT})
+  ELSE(COMPILE_OK)
+    WRITE_FILE(${PROJECT_BINARY_DIR}/CMakeError.log 
+      "Determining size of ${TYPE} failed with the following output:\n${OUTPUT}\n")
+  ENDIF(COMPILE_OK)
+ENDMACRO(CHECK_TYPE_SIZE)