pthreads issue solved (was: Re: Windows XP, gnucash build problems)

[Geert Janssens]

Christian, Martin,

Thanks for your help and tips.

I finally found the issue, mainly thanks to the configure.log/status I got 
from Christian.

I noticed that in my configure run all pthread tests returned successful, 
causing the extra LIBMULTITHREAD="-lpthread" and LTLIBMULTITHREAD="-lpthread" 
to be defined. In Christan's configuration these two were empty because all 
pthread related tests failed.

This got me digging and I finally found that I have another Msys/mingw 
installation on my system (from an unrelated project) in which a pthreads 
library was installed. Oddly enough, the configure scripts found this library 
and header, to run its tests, but libtool has issues with it later on.

The external mingw was installed in the default directory c:\mingw, while my 
gnucash one is installed in c:\gcdevel. They are completely unrelated and 
don't share any path. Yet there seem to be some information leakage between 
the two.

The fix turns out to be moving the unrelated msys/mingw instalation away from 
Msys' default path. It is now in c:\mingw-abm and the GC build now continues 
on.

I guess this is a bug in Msys. It either has got a hardcoded path to c:\mingw 
or it doesn't clearly separate the registry entries per Msys installation 
(which the Msys documentation allows none the less).

Anyway, I thought I'd just write it down in case someone else got bitten by 
this as well.

Geert