How to make Visual C++ 9 not emit code that is actually never called?
- by sharptooth
My native C++ COM component uses ATL. In DllRegisterServer() I call CComModule::RegisterServer():
STDAPI DllRegisterServer()
{
return _Module.RegisterServer(FALSE); // <<< notice FALSE here
}
FALSE is passed to indicate to not register the type library.
ATL is available as sources, so I in fact compile the implementation of CComModule::RegisterServer(). Somewhere down the call stack there's an if statement:
if( doRegisterTypeLibrary ) { //<< FALSE goes here
// do some stuff, then call RegisterTypeLib()
}
The compiler sees all of the above code and so it can see that in fact the if condition is always false, yet when I inspect the linker progress messages I see that the reference to RegisterTypeLib() is still there, so the if statement is not eliminated.
Can I make Visual C++ 9 perform better static analysis and actually see that some code is never called and not emit that code?
