added some missing standard checks [skip ci]

Author: firewave

lib/checktype.cpp

@@ -133,7 +133,7 @@ void CheckType::tooBigSignedBitwiseShiftError(const Token *tok, int lhsbits, con
 {
     constexpr char id[] = "shiftTooManyBitsSigned";
 
-    const bool cpp14 = mSettings->standards.cpp >= Standards::CPP14;
+    const bool cpp14 = mTokenizer->isCPP() && (mSettings->standards.cpp >= Standards::CPP14);
 
     std::string behaviour = "undefined";
     if (cpp14)

lib/symboldatabase.cpp

@@ -1502,7 +1502,7 @@ void SymbolDatabase::createSymbolDatabaseIncompleteVars()
         // TODO: handle all C/C++ standards
         if (cppkeywords.count(tok->str()) > 0)
             continue;
-        if (mSettings.standards.cpp >= Standards::CPP20 && cpp20keywords.count(tok->str()) > 0)
+        if (tok->isCpp() && (mSettings.standards.cpp >= Standards::CPP20) && cpp20keywords.count(tok->str()) > 0)
             continue;
         std::string fstr = tok->str();
         const Token* ftok = tok->previous();
@@ -4911,7 +4911,7 @@ const Token *Scope::checkVariable(const Token *tok, AccessControl varaccess, con
     const Token *typestart = tok;
 
     // C++17 structured bindings
-    if (settings.standards.cpp >= Standards::CPP17 && Token::Match(tok, "auto &|&&| [")) {
+    if (tok->isCpp() && (settings.standards.cpp >= Standards::CPP17) && Token::Match(tok, "auto &|&&| [")) {
         const Token *typeend = Token::findsimplematch(typestart, "[")->previous();
         for (tok = typeend->tokAt(2); Token::Match(tok, "%name%|,"); tok = tok->next()) {
             if (tok->varId())

lib/tokenize.cpp

@@ -6979,7 +6979,7 @@ void Tokenizer::simplifyVarDecl(const bool only_k_r_fpar)
 
 void Tokenizer::simplifyVarDecl(Token * tokBegin, const Token * const tokEnd, const bool only_k_r_fpar)
 {
-    const bool isCPP11  = mSettings.standards.cpp >= Standards::CPP11;
+    const bool isCPP11 = isCPP() && (mSettings.standards.cpp >= Standards::CPP11);
 
     // Split up variable declarations..
     // "int a=4;" => "int a; a=4;"
@@ -8421,7 +8421,7 @@ void Tokenizer::findGarbageCode() const
             if (!Token::Match(tok->next(), "( !!)"))
                 syntaxError(tok);
             if (tok->str() != "for") {
-                if (isGarbageExpr(tok->next(), tok->linkAt(1), mSettings.standards.cpp>=Standards::cppstd_t::CPP17))
+                if (isGarbageExpr(tok->next(), tok->linkAt(1), isCPP() && (mSettings.standards.cpp>=Standards::cppstd_t::CPP17)))
                     syntaxError(tok);
             }
         }