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

Phyx lonetiger at gmail.com
Thu Jun 16 11:49:14 UTC 2016

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
>  application.

This seems to be coming from the runtime linker, if indeed
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.

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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