Fix 12448: False positive: misra-config about unknown variable after struct keyword (#5991)

Author: swasti16

addons/misra.py

@@ -3327,6 +3327,9 @@ def misra_config(self, data):
             end_token = tok.link
             while tok != end_token:
                 tok = tok.next
+                if tok.str == 'sizeof' and tok.next.str == '(':
+                    tok = tok.next.link
+                    continue
                 if tok.str == "(" and tok.isCast:
                     tok = tok.link
                     continue
@@ -4254,6 +4257,7 @@ def setSuppressionList(self, suppressionlist):
                 self.addSuppressedRule(ruleNum)
 
     def report_config_error(self, location, errmsg):
+        errmsg = 'Because of missing configuration, misra checking is incomplete. There can be false negatives! ' + errmsg
         cppcheck_severity = 'error'
         error_id = 'config'
         if self.settings.verify:

addons/test/misra/misra-test.c

@@ -2035,3 +2035,13 @@ static void misra_22_10(void)
   f = strtod(inStr, NULL_PTR);
   if(errno != 0) {}
 }
+
+// #12448
+static void check_misra_config(void)
+{
+    if (sizeof(struct bar) == 0U) {} //no warning
+    if (sizeof(int abc) == 0U) {} //no warning
+    if (sizeof(xyz) == 0U) {} //no warning
+    if (sizeof(const pqr) == 0U) {} //no warning
+    if (sizeof(const int* const pqrs) == 0U) {} //no-warning
+}