Fix #12044 FN knownConditionTrueFalse comparing qualified constant with number (#5518)

Author: chrchr-github

lib/astutils.cpp

@@ -1506,8 +1506,12 @@ bool isSameExpression(bool cpp, bool macro, const Token *tok1, const Token *tok2
     if (cpp) {
         if (tok1->str() == "." && tok1->astOperand1() && tok1->astOperand1()->str() == "this")
             tok1 = tok1->astOperand2();
+        while (Token::simpleMatch(tok1, "::") && tok1->astOperand2())
+            tok1 = tok1->astOperand2();
         if (tok2->str() == "." && tok2->astOperand1() && tok2->astOperand1()->str() == "this")
             tok2 = tok2->astOperand2();
+        while (Token::simpleMatch(tok2, "::") && tok2->astOperand2())
+            tok2 = tok2->astOperand2();
     }
     // Skip double not
     if (Token::simpleMatch(tok1, "!") && Token::simpleMatch(tok1->astOperand1(), "!") && !Token::simpleMatch(tok1->astParent(), "=") && astIsBoolLike(tok2)) {

test/testother.cpp

@@ -6875,6 +6875,31 @@ class TestOther : public TestFixture {
                       "[test.cpp:4]: (style) The comparison 'E0 > 0' is always false.\n"
                       "[test.cpp:5]: (style) The comparison 'E0 == 0' is always true.\n",
                       errout.str());
+
+        check("struct S {\n" // #12040, #12044
+              "    static const int I = 0;\n"
+              "    enum { E0 };\n"
+              "    enum F { F0 };\n"
+              "    void f() {\n"
+              "        if (0 > I) {}\n"
+              "        if (0 > S::I) {}\n"
+              "        if (0 > E0) {}\n"
+              "        if (0 > S::E0) {}\n"
+              "    }\n"
+              "};\n"
+              "void g() {\n"
+              "    if (0 > S::I) {}\n"
+              "    if (0 > S::E0) {}\n"
+              "    if (0 > S::F::F0) {}\n"
+              "}\n");
+        ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:6]: (style) The comparison '0 > I' is always false.\n"
+                      "[test.cpp:2] -> [test.cpp:7]: (style) The comparison '0 > S::I' is always false.\n"
+                      "[test.cpp:8]: (style) The comparison '0 > E0' is always false.\n"
+                      "[test.cpp:9]: (style) The comparison '0 > S::E0' is always false.\n"
+                      "[test.cpp:2] -> [test.cpp:13]: (style) The comparison '0 > S::I' is always false.\n"
+                      "[test.cpp:14]: (style) The comparison '0 > S::E0' is always false.\n"
+                      "[test.cpp:15]: (style) The comparison '0 > S::F::F0' is always false.\n",
+                      errout.str());
     }
 
     void duplicateExpressionLoop() {