[Haskell-cafe] GHC can't find DLL dependencies on Windows

[lennart spitzner]

hi Ryan,

As i fought the same battle recently, i will point out one related
thing: If you plan to deploy your program, and copy the necessary dlls
along with it, there can be a strange issue if you miss to copy some
dependencies that are present (with a different version) on the target
system. (presumably they were present due to a ghc install, but i have
not investigated that part).

The error was "The procedure entry point
pthread_cond_timedwait_relative_np could not be located [..]" when
trying to run the compiled executable. Fixed by including more of the
msys/mingw64/bin dlls.

I had tried to determine the dependencies with a different tool; maybe
cygcheck does a better job so this won't arise.

Just thought i'd let you know as i found this annoying to diagnose
(and the googles don't help much).


Lennart


On 29/10/15 00:19, Ryan Scott wrote:
> Never mind, I figured it out. Previously, I had been placing
> C:\msys64\mingw64\bin at the end of my user PATH. It turns out that my
> PATH was in fact on the DLL search path, but for some reason, an
> earlier directory on my PATH was causing problems. I can't exactly
> pinpoint what was causing the problem, but after moving
> C:\msys64\mingw64\bin to the start of my system PATH, I can run
> Haskell executables in PowerShell/cmd.exe without a problem.
>
> Ryan S.
> _______________________________________________
> Haskell-Cafe mailing list
> Haskell-Cafe at haskell.org
> http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe
>



On 29/10/15 00:19, Ryan Scott wrote:
> Never mind, I figured it out. Previously, I had been placing
> C:\msys64\mingw64\bin at the end of my user PATH. It turns out that my
> PATH was in fact on the DLL search path, but for some reason, an
> earlier directory on my PATH was causing problems. I can't exactly
> pinpoint what was causing the problem, but after moving
> C:\msys64\mingw64\bin to the start of my system PATH, I can run
> Haskell executables in PowerShell/cmd.exe without a problem.
> 
> Ryan S.
> _______________________________________________
> Haskell-Cafe mailing list
> Haskell-Cafe at haskell.org
> http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe
>