Fix #12362: False positive: misra 8.7: taking function by address is not recognized as function usage (#5920)

Author: swasti16

addons/misra.py

@@ -1516,7 +1516,7 @@ def _save_ctu_summary_usage(self, dumpfile, cfg):
         for token in cfg.tokenlist:
             if not token.isName:
                 continue
-            if token.function and token.scope.isExecutable:
+            if token.function and token != token.function.tokenDef:
                 if (not token.function.isStatic) and (token.str not in names):
                     names.append({'name': token.str, 'file': token.file})
             elif token.variable:

addons/test/misra/misra-ctu-1-test.c

@@ -46,3 +46,7 @@ extern int misra_8_5;
 int32_t misra_8_6 = 1;
 
 void misra_8_7_external(void) {}
+
+// #12362
+void misra_8_7_compliant( void ){}
+static void misra_8_7_call(void) { misra_8_7_compliant(); }

addons/test/misra/misra-ctu-2-test.c

@@ -56,3 +56,6 @@ static void misra_8_7_caller(void) {
     misra_8_7_external();
 }
 
+// #12362
+typedef void(*misra_8_7_func_ptr)( void );
+static const misra_8_7_func_ptr ptrs[] = { misra_8_7_compliant, NULL };

addons/test/misra/misra-ctu-test.h

@@ -18,4 +18,6 @@ void misra_8_7_external(void);
 // cppcheck-suppress misra-c2012-2.5
 #define MISRA_2_5_VIOLATION 0
 
+// #12362
+extern void misra_8_7_compliant( void );