[cfe-users] inconsistent compilation error inside constexpr if

[Manu agarwal via cfe-users]

Hello,

In the below code the compiler throws "undeclared identifier" when the 
commented line is uncommented. Whereas the line just before compiles fine.

Regards,
Manu

typedef bool (* DummyFunc)   ();


bool ExecDummy (DummyFunc fptr) {

    if (fptr)
        return fptr ();

    return false;
}

constexpr unsigned int IsMyAppClient = 0;

constexpr bool CheckForTypeClient (unsigned int pAppType)
{
    return ((pAppType & IsMyAppClient) != 0);
}


class  MyAppTemplate
{
public:
    template <unsigned int T>
    static    bool    MyAppInit ();
};

template <unsigned int T>
bool
MyAppTemplate::MyAppInit ()
{
    if constexpr (CheckForTypeClient(T)) {

        return ClientMain ();                    // no error
        //return ExecDummy(ClientMain);            // error: use of undeclared 
identifier 'ClientMain'
    }

    return false;
}

int __cdecl
main (int pArgc, char* pArgv[])
{
    constexpr int TVal = 3;

    MyAppTemplate::MyAppInit<TVal> ();

    return 0;
}



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