misra: When checking C++ code only activate certain misra c++ compliant rules. It will be supported to run the addon on C++ code.

addons/misra.py

@@ -1,6 +1,7 @@
 #!/usr/bin/env python3
 #
 # MISRA C 2012 checkers
+# Partially reused for "MISRA C++ 2008" checking
 #
 # Example usage of this addon (scan a sourcefile main.cpp)
 # cppcheck --dump main.cpp
@@ -4208,6 +4209,7 @@ class MisraChecker:
         :param args: Check function arguments
         """
         if not self.isRuleGloballySuppressed(rule_num):
+            if (not self.is_cpp) or rule_num in (202,203,1901):
                 check_function(*args)
 
     def parseDump(self, dumpfile):
@@ -4249,6 +4251,8 @@ class MisraChecker:
         else:
             self.printStatus('Checking ' + dumpfile + '...')
 
+        self.is_cpp = data.files and data.files[0].endswith('.cpp')
+
         for cfgNumber, cfg in enumerate(data.iterconfigurations()):
             if not self.settings.quiet:
                 self.printStatus('Checking %s, config %s...' % (dumpfile, cfg.name))

addons/test/misra/misra-test.cpp

@@ -7,7 +7,7 @@ class C {
 
 class misra_21_1_C {
     public:
-       misra_21_1_C operator=(const misra_21_1_C &); // 8.2
+       misra_21_1_C operator=(const misra_21_1_C &);
 };
 
 class C2 {
@@ -20,6 +20,6 @@ C2::C2(void) : f(NULL) {}
 
 static void test_misra_21_1_crash(void)
 {
-    auto misra_21_1_C a, b; // 12.3
+    auto misra_21_1_C a, b;
     a = b;
 }