Fix 11887: FP knownPointerToBool with const_cast (#5357)

lib/astutils.cpp

@@ -743,7 +743,8 @@ std::vector<ValueType> getParentValueTypes(const Token* tok, const Settings* set
         return {std::move(vtParent)};
     }
     // The return type of a function is not the parent valuetype
-    if (Token::simpleMatch(tok->astParent(), "(") && ftok && !tok->isCast() && ftok->tokType() != Token::eType)
+    if (Token::simpleMatch(tok->astParent(), "(") && ftok && !tok->astParent()->isCast() &&
+        ftok->tokType() != Token::eType)
         return {};
     if (Token::Match(tok->astParent(), "return|(|{|%assign%") && parent) {
         *parent = tok->astParent();

lib/checkcondition.cpp

@@ -1468,8 +1468,12 @@ void CheckCondition::alwaysTrueFalse()
     const SymbolDatabase *symbolDatabase = mTokenizer->getSymbolDatabase();
     for (const Scope * scope : symbolDatabase->functionScopes) {
         for (const Token* tok = scope->bodyStart->next(); tok != scope->bodyEnd; tok = tok->next()) {
-            if (Token::simpleMatch(tok, "<") && tok->link()) // don't write false positives when templates are used
+            // don't write false positives when templates are used or inside of asserts or non-evaluated contexts
+            if (tok->link() && (Token::simpleMatch(tok, "<") ||
+                                Token::Match(tok->previous(), "static_assert|assert|ASSERT|sizeof|decltype ("))) {
+                tok = tok->link();
                 continue;
+            }
             if (!tok->hasKnownIntValue())
                 continue;
             if (Token::Match(tok->previous(), "%name% (") && tok->previous()->function()) {

test/testcondition.cpp

@@ -4527,6 +4527,12 @@ private:
         ASSERT_EQUALS("[test.cpp:5]: (style) Condition 'i==7' is always false\n"
                       "[test.cpp:6]: (style) Condition 'p==nullptr' is always false\n",
                       errout.str());
+
+        check("enum E { E0, E1 };\n"
+              "void f() {\n"
+              "	static_assert(static_cast<int>(E::E1) == 1);\n"
+              "}\n");
+        ASSERT_EQUALS("", errout.str());
     }
 
     void alwaysTrueSymbolic()

test/testother.cpp

@@ -11362,6 +11362,12 @@ private:
               "}\n");
         ASSERT_EQUALS("", errout.str());
 
+        check("void f() {\n"
+              "    const int* x = nullptr;\n"
+              "    std::empty(const_cast<int*>(x));\n"
+              "}\n");
+        ASSERT_EQUALS("", errout.str());
+
         check("struct A { bool x; };\n"
               "bool f(A* a) {\n"
               "    if (a) {\n"