Hi, sorry for the delay in replying.
You were right -- it was not finding the correct version of the library.
In fact, all I had to do was change the order in my LD_LIBRARY_PATH --
but thanks for the suggestion on strace -- I will certainly be using
this tool for future problems.
Many thanks
Martin
John Goerzen wrote:
On 2006-07-10, Martin Percossi [EMAIL PROTECTED] wrote:
Hi, I'm having problems using HDBC-postgresql (I've tried both 0.99.2.1
and 1.0.0.0) with postgresql (version 8.1.4, installed in /share/pgsql).
I adjust the include-dir and extra-lib-dirs to use the custom location
of postgresql, and build: no error messages, everything seems fine.
Probably, though, there is something that is not quite fine...
However, when I then try to type:
ghci -package HDBC -package HDBC-postgresql
, I get the error message:
Loading package HDBC-postgresql-0.99.2.1 ... linking ... ghc-6.4.2:
/home/mpercossi/opt/lib/HDBC-postgresql-0.99.2.1/HSHDBC-postgresql-0.99.2.1.o:
unknown symbol `PQserverVersion'
ghc-6.4.2: unable to load package `HDBC-postgresql-0.99.2.1'
This sounds like it's not finding your PostgreSQL libraries.
First, can you confirm that PQserverVersion still occurs in your
libpq-fe.h?
Next, try strace on your ghci session.
Grep for libpq in the output. It may be instructive.
In my case, I saw:
stat64(/usr/lib/haskell-packages/ghc6/lib/HDBC-postgresql-0.99.2.1/libpq_dyn.so,
0xb763a1e0) = -1 ENOENT (No such file or directory)
stat64(/usr/lib/haskell-packages/ghc6/lib/HDBC-postgresql-0.99.2.1/libpq.so,
0xb763a570) = -1 ENOENT (No such file or directory)
open(/usr/lib/libpq.so, O_RDONLY) = 3
So we know that the system did successfully open that library.
Has anyone seen this error message before? Google didn't turn up
anything relevant to haskell -- however there does seem to be a
PQserverVersion procedure in the libpq library -- maybe HDBC-postgresql
is not seeing this due to the custom install location?
This would all be up to your modifications to cabal.
Try: ghc-pkg describe HDBC-postgresql
You should see:
* pq in the extra-libraries line
* Your header file location in the include-dirs line
* Your extra-lib-dirs path
If you don't see those things, then something went wrong with the build
or install.
I would also suggesting building a program with GHC (not GHCI) that uses
HDBC-postgresql for testing.
-- John
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