#10885: Crashes on FFI calls to Visual Studio-built C library -------------------------------------+------------------------------------- Reporter: mwu | Owner: Type: bug | Status: new Priority: high | Milestone: Component: Compiler | Version: 7.10.1 Resolution: | Keywords: Operating System: Windows | Architecture: x86_64 | (amd64) Type of failure: Runtime crash | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Comment (by mwu): @rwbarton From what I see {{{OSMinGW32}}} is just an OS name (meaning simply "Windows") and has no relation to the 32/64-bit targeting (i.e. targeted architecture). The shadow space you mention is interesting. I know little about GHC inner workings and calling conventions, so take my speculations with a grain of salt. Still, from what I understand, both MinGW and MSVC on x64 Windows use the same calling convention. If it was the problem, it should fail with both. Moreover, Haskell code is able to correctly call x64 MSVC-built dll. The problem seems to be related only to the MSVC-generated import library (the {{{.lib}}} file). You might want to compare MinGW's and MSVC's {{{adder.lib}}} files in the {{{repro_bin.7z}}} package I uploaded. With one, calling {{{addd}}} method works, with another one it crashes. I'd suspect that difference should be somewhere there. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10885#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler