Control of Swift Entry Point

[Joe_Groff]

@compnerd

Correct, the entry point doesn't really matter too much - but the access to the hInstance is much trickier without the correct entry point - remember that you cannot call GetModuleW anywhere and have it do the right thing (that is, doing that in swiftCore.dll will give you the wrong value, doing that in a different library will give you the wrong handle) and so this introduces a problematic scenario.

What do you mean by the "right thing"? GetModuleHandleW(NULL) always returns the executable's module handle, which is what you would have gotten from WinMain.

@compnerd

The other question is, how do we expose this to the user? -Xlinker /SUBSYSTEM:CONSOLE and -Xlinker /SUBSYSTEM:WINDOWS seems less than ideal.

Does the target triple encode that? If not, adding a Swift driver flag seems reasonable.