Some fixes for CheckOther::checkIgnoredReturnValue():

- Fixed name of the function
- Fixed false positive for code like "class strcmp { strcmp() {} };"
- Fixed FP #6233 on checking side (no AST generated for function call)

lib/checkother.cpp

@@ -2744,7 +2744,7 @@ void CheckOther::varFuncNullUBError(const Token *tok)
 //---------------------------------------------------------------------------
 // Check for ignored return values.
 //---------------------------------------------------------------------------
-void CheckOther::checkReturnIgnoredReturnValue()
+void CheckOther::checkIgnoredReturnValue()
 {
     if (!_settings->isEnabled("warning"))
         return;
@@ -2754,9 +2754,12 @@ void CheckOther::checkReturnIgnoredReturnValue()
     for (std::size_t i = 0; i < functions; ++i) {
         const Scope * scope = symbolDatabase->functionScopes[i];
         for (const Token* tok = scope->classStart; tok != scope->classEnd; tok = tok->next()) {
-            if (tok->varId() || !Token::Match(tok, "%var% (") || tok->strAt(-1) == ".")
+            if (tok->varId() || !Token::Match(tok, "%var% (") || tok->strAt(-1) == "." || tok->next()->astOperand1() != tok)
                 continue;
 
+            if (!tok->scope()->isExecutable())
+                tok = tok->scope()->classEnd;
+
             if (!tok->next()->astParent() && (!tok->function() || !Token::Match(tok->function()->retDef, "void %var%")) && _settings->library.useretval.find(tok->str()) != _settings->library.useretval.end())
                 ignoredReturnValueError(tok, tok->str());
         }

lib/checkother.h

@@ -73,7 +73,7 @@ public:
         checkOther.checkVarFuncNullUB();
         checkOther.checkNanInArithmeticExpression();
         checkOther.checkCommaSeparatedReturn();
-        checkOther.checkReturnIgnoredReturnValue();
+        checkOther.checkIgnoredReturnValue();
     }
 
     /** @brief Run checks against the simplified token list */
@@ -231,7 +231,7 @@ public:
     void checkComparisonFunctionIsAlwaysTrueOrFalse();
 
     /** @brief %Check for ignored return values. */
-    void checkReturnIgnoredReturnValue();
+    void checkIgnoredReturnValue();
 
 private:
     // Error messages..

test/testother.cpp

@@ -6277,6 +6277,11 @@ private:
               "}", "test.cpp", false, false, false, true, &settings_std);
         ASSERT_EQUALS("", errout.str());
 
+        check("void foo() {\n"
+              "    class strcmp { strcmp() {} };\n" // strcmp is a constructor definition here
+              "}", "test.cpp", false, false, false, true, &settings_std);
+        ASSERT_EQUALS("", errout.str());
+
         check("void foo() {\n"
               "    return strcmp(a, b);\n"
               "}", "test.cpp", false, false, false, true, &settings_std);
@@ -6303,6 +6308,17 @@ private:
               "    DebugLog::getInstance().log(systemInfo.getSystemInfo());\n"
               "}", "test.cpp", false, false, false, true, &settings_std);
         ASSERT_EQUALS("", errout.str());
+
+        // #6233
+        check("int main() {\n"
+              "    auto lambda = [](double value) {\n"
+              "        double rounded = floor(value + 0.5);\n"
+              "        printf(\"Rounded value = %f\\n\", rounded);\n"
+              "    };\n"
+              "    lambda(13.3);\n"
+              "    return 0;\n"
+              "}");
+        ASSERT_EQUALS("", errout.str());
     }
 };