On 17-Dec-06, at 12:12 AM, Ian Lynagh wrote:
Hi all,
Is anyone else seeing a failure with the HEAD linking the stage2
GHC on
Windows (XP Pro)? This is under cygwin, and I can build 6.6 fine.
Anyone
got any idea what's going wrong?
From looking at the code, my guess is that this is a severe case of
Calling Convention Confusion.
GetWindowsDirectoryW and GetSystemDirectoryW are declared as ccall,
and I think they should be stdcall like everything else.
As far as DeleteObject is concerned, Types.hs has a 'foreign import
stdcall unsafe "windows.h &DeleteObject"'; there are two problems
with this:
a) The stdcall modifier is ignored by GHC, the compiler generates a
ref to DeleteObject, not [EMAIL PROTECTED] as it should. I think this is
our link error.
GHC would need to look at the imported thing's FunPtr type to
determine the argument size, and complain if a non-function is
imported as "stdcall".
b) A pointer to a stdcall function (DeleteObject) is used where a
pointer to a ccall function is expected (ForeignPtr finaliser).
AFAICT, this is supposed to cause cause quite horrible crashes (stack
corruption), and we should really be glad about that link error.
So, I think those Get*DirectoyW functions need to be stdcalled, and
DeleteObject needs a ccalled wrapper in cbits.
I have no idea why things worked with ghc-6.6. Are all those
functions unused in 6.6?
Hope that helps,
Wolfgang
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