#3242: ghci: can't load .so/.DLL for: m (addDLL: could not load DLL) ---------------------------------+----------------------------- Reporter: jeffz1 | Owner: Phyx- Type: bug | Status: new Priority: high | Milestone: 8.0.1 Component: GHCi | Version: 7.4.1 Resolution: | Keywords: Operating System: Windows | Architecture: x86 Type of failure: None/Unknown | Test Case: Blocked By: 3658 | Blocking: Related Tickets: #7097 | Differential Rev(s): Wiki Page: | ---------------------------------+----------------------------- Comment (by Phyx-): It seems the issue is caused by `findArchive` being unable to find any archives that are shipped using the in-place `GCC`. - It works on Linux because `findArchive` would search the standard Linux include path. - It works during compilation because `GCC` can find it's own libraries (we explicitly tell it where to look for libraries using the `gcc` wrapper around `realgcc`) So fixing the issue means using `searchForLibUsingGcc` in `findArchive` as well, which will then find the correct file. The reason for the error as it is, is because if we can't locate the library using any of the methods we have, we assume it is a system dll, or something on the system search path. e.g. if trying to load `kernel32.dll`. There is a slight issue in that the `GHCi` code (incorrectly) favors `static archives` over `dynamic` ones {{{ findDll `orElse` findArchive `orElse` tryGcc `orElse` tryGccPrefixed `orElse` assumeDll }}} This has the unwanted effect of when `kernel32` is specific as a lib, it will try to load `kernel32.a` instead of `kernel32.dll`. To solve this I have added another search function that is able to search the Windows search paths using `SearchPath` in order to find if it is a dll on the system search path. The new search order is: {{{ findDll `orElse` findSysDll `orElse` tryGcc `orElse` findArchive `orElse` assumeDll }}} (`tryGccPrefixed` was rolled into `tryGcc` so it is no longer needed at top level) This seems to be working well, it is dependent on another patch of mine so have to push that one through before this one. But patch coming soon. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/3242#comment:40 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler