Fix #15153 FP constParameterPointer with unused attribute

Unused parameters annotated with the unused attribute were reported as they
could be declared as pointer to const, while [[maybe_unused]] parameters were
not.

Author: mptre

lib/symboldatabase.cpp

@@ -2560,7 +2560,7 @@ void Variable::evaluate(const Settings& settings)
     bool isContainer = false;
     if (mNameToken) {
         setFlag(fIsArray, arrayDimensions(settings, isContainer));
-        setFlag(fIsMaybeUnused, mNameToken->isAttributeMaybeUnused());
+        setFlag(fIsMaybeUnused, mNameToken->isAttributeMaybeUnused() || mNameToken->isAttributeUnused());
     }
 
 

lib/tokenize.cpp

@@ -9663,8 +9663,8 @@ static Token* getVariableTokenAfterAttributes(Token* tok) {
     Token *vartok = nullptr;
     Token *after = getTokenAfterAttributes(tok, true);
 
-    // check if after variable name
-    if (Token::Match(after, "[;={]")) {
+    // check if after variable or parameter name
+    if (Token::Match(after, "[;={,)]")) {
         Token *prev = tok->previous();
         while (Token::simpleMatch(prev, "]"))
             prev = prev->link()->previous();

test/testother.cpp

@@ -5020,6 +5020,11 @@ class TestOther : public TestFixture {
               "};\n");
         ASSERT_EQUALS("[test.cpp:2:17]: (style) Either there is a missing override/final keyword, or the parameter 'p' can be declared as pointer to const [constParameterPointer]\n",
                       errout_str());
+
+        check("void f(int *p __attribute__((unused))) {}\n"
+              "void g(__attribute__((unused)) int *p) {}\n"
+              "void h(int *p) {}\n");
+        ASSERT_EQUALS("[test.cpp:3:13]: (style) Parameter 'p' can be declared as pointer to const [constParameterPointer]\n", errout_str());
     }
 
     void constArray() {