[Haskell-cafe] partial solved problem installing postgreSQL-libpq on Windows?

Kees Bleijenberg K.Bleijenberg at lijbrandt.nl
Thu Jun 16 16:46:17 UTC 2016

Hi Tamar,


Thank you. 

 I installed Haskell Platform 8.0.1. Now I can’t install snap any more. I want to use postgresql in snap.  Grrr.

If I get something working I’ll let you know.




Van: Phyx [mailto:lonetiger at gmail.com] 
Verzonden: donderdag 16 juni 2016 13:49
Aan: K.Bleijenberg at lijbrandt.nl
CC: haskell-cafe at haskell.org
Onderwerp: partial solved problem installing postgreSQL-libpq on Windows?


Hi Kees,


Would It be possible for you to try with GHC 7.10.3 or 8.0.1?


A bunch of things have changed with the linker in these two versions which should make

linking against packages easier.


 <command line>: can't load .so/.DLL for:
 d:/PROGRA~2/POSTGR~1/9.3/lib\libpq.dll (addDLL: could not load DLL)


 ghc.exe: d:/PROGRA~2/POSTGR~1/9.3/lib\libpq: %1 is not a valid Win32


This seems to be coming from the runtime linker, if indeed d:/PROGRA~2/POSTGR~1/9.3/lib\libpq.dll

can be found then either it's the wrong bitness/image type or libpq.dll has dependencies on other dlls.


7.10.1 is not able to load these then as the search path won't be correct. To test this you can add

d:/PROGRA~2/POSTGR~1/9.3/lib\ to your path and try loading it again.


If that doesn't work and you want to know what's really going on, you can enable loader snaps

in gflags for GHC.exe and GHCi.exe (or runHaskell, what ever it is you're using) and attach a debugger like gdb

or windbg. https://msdn.microsoft.com/en-us/library/windows/hardware/ff556886(v=vs.85).aspx


You'll then be able to see the OS's trace messages for the loader and it should tell you exactly what's wrong.


 >From the msys prompt: pexports "d:\program
 files\postgreSQL\9.3\bin\libpq.dll" > libpq.def

 >From the msys prompt: dlltool  -d libpq.def -l libpq.a


 Import libraries are supported by the GHC but not ghci or any other interpreted mode (until 8.0.2)

So this would only work for the compiled program without Template Haskell.




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