Stdcall - treating as CCall (bogus warning on win 64 bit)

On windows you generally have the stdcall calling convention so you're average foreign import looks like this:

foreign import stdcall "someFile.h getFoo" getFoo :: IO Foo

But on a 64 bit system, GHC warns:

C:\Some\Path.hs:35:1: warning: [-Wunsupported-calling-conventions]
    * the 'stdcall' calling convention is unsupported on this platform, treating as ccall
    * When checking declaration:
        foreign import stdcall safe "static someFile.h getFoo" getFoo :: IO Foo

Both stdcall & ccall are not applicable to a 64 bit system as far as I know, and if it was really treating it as ccall it would have segfaulted at runtime. So the warning is a bit of a lie anyway.

So far some developers generally have resorted to creating c preprocessor macros like this: https://www.mail-archive.com/cvs-libraries@haskell.org/msg09725.html

Apologies if this is a dupe, I thought someone already reported this a long time ago but I can't seem to find the ticket.

Trac metadata

Trac field	Value
Version	8.0.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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