Fix 12448: False positive: misra-config about unknown variable after …

…struct keyword

addons/misra.py

@@ -3342,7 +3342,15 @@ def misra_config(self, data):
                     continue
                 if tok.astParent.str == "." and tok.astParent.valueType:
                     continue
-                self.report_config_error(tok, "Variable '%s' is unknown" % tok.str)
+                tok_pre = tok.previous
+                name = False
+                while tok_pre.isName or tok_pre.str == "*":
+                    if tok_pre.str != '*':
+                        name = True
+                        break
+                    tok_pre = tok_pre.previous
+                if not name:
+                    self.report_config_error(tok, "Variable '%s' is unknown" % tok.str)
 
     def misra_17_6(self, rawTokens):
         for token in rawTokens:
@@ -4254,6 +4262,7 @@ 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) {} //config
+    if (sizeof(const pqr) == 0U) {} //no warning
+    if (sizeof(const int* const pqrs) == 0U) {} //no-warning
+}