cmake: Make CHECK_C_COMPILER_FLAG_SSP a function.

cmake/Modules/CheckCCompilerFlagSSP.cmake

@@ -1,11 +1,12 @@
 # - Check whether the C compiler supports a given flag in the
 # context of a stack checking compiler option.
+
 # CHECK_C_COMPILER_FLAG_SSP(FLAG VARIABLE)
 #
 #  FLAG - the compiler flag
 #  VARIABLE - variable to store the result
 #
-#  This actually calls the check_c_source_compiles macro.
+#  This actually calls check_c_source_compiles.
 #  See help for CheckCSourceCompiles for a listing of variables
 #  that can modify the build.
 
@@ -15,12 +16,11 @@
 # For details see the accompanying COPYING-CMAKE-SCRIPTS file.
 
 
-INCLUDE(CheckCSourceCompiles)
-
-MACRO (CHECK_C_COMPILER_FLAG_SSP _FLAG _RESULT)
-   SET(SAFE_CMAKE_REQUIRED_DEFINITIONS "${CMAKE_REQUIRED_DEFINITIONS}")
-   SET(CMAKE_REQUIRED_DEFINITIONS "${_FLAG}")
-   CHECK_C_SOURCE_COMPILES("int main(int argc, char **argv) { char buffer[256]; return buffer[argc]=0;}" ${_RESULT})
-   SET (CMAKE_REQUIRED_DEFINITIONS "${SAFE_CMAKE_REQUIRED_DEFINITIONS}")
-ENDMACRO (CHECK_C_COMPILER_FLAG_SSP)
+include(CheckCSourceCompiles)
 
+function(CHECK_C_COMPILER_FLAG_SSP _FLAG _RESULT)
+   set(SAFE_CMAKE_REQUIRED_DEFINITIONS "${CMAKE_REQUIRED_DEFINITIONS}")
+   set(CMAKE_REQUIRED_DEFINITIONS "${_FLAG}")
+   check_c_source_compiles("int main(int argc, char **argv) { char buffer[256]; return buffer[argc]=0;}" ${_RESULT})
+   set(CMAKE_REQUIRED_DEFINITIONS "${SAFE_CMAKE_REQUIRED_DEFINITIONS}")
+endfunction(CHECK_C_COMPILER_FLAG_SSP)

cmake/Modules/DefineCompilerFlags.cmake

@@ -1,7 +1,7 @@
 # define system dependent compiler flags
 
 include(CheckCCompilerFlag)
-include(MacroCheckCCompilerFlagSSP)
+include(CheckCCompilerFlagSSP)
 
 if (UNIX AND NOT WIN32)
     #