That did it, thanks. Instead of using ghc's -L/-l flags, I used: -optl c:\windows\system32\ntwdblib.dll

-----Original Message----- From: Sigbjorn Finne [mailto:sof@galois.com] Sent: 28 April 2005 01:04 To: Bayley, Alistair Cc: glasgow-haskell-users@haskell.org Subject: Re: Linker errors when using FFI on Windows

Adding the -Lc:\windows\system32 option when linking upsets the resolution of misc standard libraries, causing 'ld' to use the DLLs rather than the mingw link libraries, including msvcrt.dll.

Try just using c:/windows/system32/ntwdblib.dll on the link line instead. If ld's DLL auto-import support doesn't quite work, attempting to link with the import library 'ntwdblib' (ntwdblib.lib ?) instead is worth a shot. The SQL Server SDK ought to include that somewhere.

hth --sigbjorn

----- Original Message ----- From: "Bayley, Alistair" To: Sent: Wednesday, April 27, 2005 08:10 Subject: Linker errors when using FFI on Windows

...

I'm trying to link an FFI program against a Windows (XP) DLL (c:\windows\system32\ntwdblib - this is the MS Sql Server client library). The output from ghc6.4 -v is below; the errors start in the Linker section.

Comments:

- Where do these objects d0000xx.o come from? (They're not in my source...)

d000013.o(.text+0x0): multiple definition of `_onexit' c:/ghc/ghc-6.4/gcc-lib/crt2.o(.text+0x2a0):crt1.c: first defined here d000018.o(.text+0x0): multiple definition of `atexit' c:/ghc/ghc-6.4/gcc-lib/crt2.o(.text+0x280):crt1.c: first defined here

- Have I omitted some important linker flag? There are tons of these undefined references from crt2.o, like this:

c:/ghc/ghc-6.4/gcc-lib/crt2.o(.text+0x238):crt1.c: undefined reference to `ExitProcess@4'

Thanks, Alistair.

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