#13431: Linker error related to atan and ntdll on 32-bit Windows -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: Phyx- Type: bug | Status: upstream Priority: normal | Milestone: 8.4.1 Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: Windows | Architecture: x86 Type of failure: GHC rejects | Test Case: valid program | Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by Phyx-): * status: new => upstream * milestone: => 8.4.1 Comment: I believe this to be an upstream bug in `mingw-w64-crt`. It seems that `ntdll.dll` undocumented exports a few functions such as `atan`. The import libraries are created by default using a tool that scrapes the exports table of a dll and makes a `.def` file and then `dlltool` is called to generate the library. The problem is that this tool on the `x86` version seems to think these functions are `DATA` references (e.g. readonly data) instead of functions. And this it only exports `_imp__atan` instead of both `_atan` and `_imp__atan`. On `x64` the tool does get this correct. {{{ Tamar@Kino MINGW64 ~/MINGW-packages/mingw-w64-crt-git/src/mingw-w64 $ find -iname ntdll.def | xargs grep atan ./mingw-w64-crt/lib32/ntdll.def:atan DATA ./mingw-w64-crt/lib64/ntdll.def:atan ./mingw-w64-crt/libarm32/ntdll.def:atan }}} This will require some upstream patching because controlling the link order in all cases is very hard. In the meantime since it seems that `Win32` is the only one that's introducing this dependency, I think I can apply a patch locally there for `x86`. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13431#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler