fix #10040 (symbolDatabaseWarning: debug: Executable scope 'x' with unknown function.) (#2955)

lib/symboldatabase.cpp

@@ -2286,6 +2286,24 @@ static std::string qualifiedName(const Scope *scope)
 
 static bool usingNamespace(const Scope *scope, const Token *first, const Token *second, int &offset)
 {
+    // check if qualifications match first before checking if using is needed
+    const Token *tok1 = first;
+    const Token *tok2 = second;
+    bool match = false;
+    while (Token::Match(tok1, "%type% :: %type%") && Token::Match(tok2, "%type% :: %type%")) {
+        if (tok1->str() == tok2->str()) {
+            tok1 = tok1->tokAt(2);
+            tok2 = tok2->tokAt(2);
+            match = true;
+        } else {
+            match = false;
+            break;
+        }
+    }
+
+    if (match)
+        return false;
+
     offset = 0;
     std::string name = first->str();
 
@@ -3155,6 +3173,8 @@ static std::string scopeToString(const Scope* scope, const Tokenizer* tokenizer)
     std::ostringstream oss;
     if (scope) {
         oss << scope->type << " ";
+        if (!scope->className.empty())
+            oss << scope->className << " ";
         if (scope->classDef)
             oss << tokenizer->list.fileLine(scope->classDef) << " ";
     }

test/testsymboldatabase.cpp

@@ -331,6 +331,7 @@ private:
         TEST_CASE(symboldatabase85);
         TEST_CASE(symboldatabase86);
         TEST_CASE(symboldatabase87); // #9922 'extern const char ( * x [ 256 ] ) ;'
+        TEST_CASE(symboldatabase88); // #10040 (using namespace)
 
         TEST_CASE(createSymbolDatabaseFindAllScopes1);
 
@@ -4782,6 +4783,27 @@ private:
         ASSERT(xtok->variable());
     }
 
+    void symboldatabase88() { // #10040 (using namespace)
+        check("namespace external {\n"
+              "namespace ns {\n"
+              "enum class s { O };\n"
+              "}\n"
+              "}\n"
+              "namespace internal {\n"
+              "namespace ns1 {\n"
+              "template <typename T>\n"
+              "void make(external::ns::s) {\n"
+              "}\n"
+              "}\n"
+              "}\n"
+              "using namespace external::ns;\n"
+              "struct A { };\n"
+              "static void make(external::ns::s ss) {\n"
+              "  internal::ns1::make<A>(ss);\n"
+              "}\n", true);
+        ASSERT_EQUALS("", errout.str());
+    }
+
     void createSymbolDatabaseFindAllScopes1() {
         GET_SYMBOL_DB("void f() { union {int x; char *p;} a={0}; }");
         ASSERT(db->scopeList.size() == 3);