Re: dependency on 32 bit libpq.so on 64 bit Postgres server.

> let me explain with an example
> say i have a 32 bit exceutable called Installer
>
> it dynamically links to 4 libraries which are called:
> libdbx1, it is dependent on (ROOT)/postgres/arch/$(ARCH)d/lib -lpq
(specified in the makefile)
> libdbx2, it is also dependent on (ROOT)/postgres/arch/$(ARCH)d/lib
-lpq (specified in the makefile)
> libdbx3
> libdbx4
>
> the above directory (ROOT)/postgres/arch/$(ARCH)d/lib
>
> has libpq.so which i got by installing the 32 bit Postgres 8.1.5 on
fc4
> its sixe is : 116532
>
> now i put these 4 libs and the exe in the target mach
> and i run the executable Installer
>
> the traget m/c is FC4 has Postgres 8.1.5 installed which is 64 bit
>
> so it has libpq.so.4 and libpq.so.4.1 in /usr/lib64/ of that machine.
>
> rwxrwxrwx 1 root root 12 Nov 16 15:11 libpq.so.4 -> libpq.so.4.1*
> -rwxr-xr-x 1 root root 135960 Nov 16 00:30 libpq.so.4.1*
>
> so when i run the exe it gives me this error:
>
> | 2006-11-17 13:56:18.085 | 5659:1436573184 | DMF | 0 | ERROR
> | error(at)dmf | DMFConcreteRepositoryCreatorFactory.cxx:77 |
> Cannot find library for dbexpress: libpq.so.4: cannot open
> shared object file: No such file or directory
> | 2006-11-17 13:56:18.085 | 5659:1436573184 | DMF | 0 | ERROR
> | error(at)dmf | DMFConcreteRepositoryCreatorFactory.cxx:122 |
> Unknown repository: dbexpress

I see.

You will need the 32-bit library libpq.so.4 to run your installer
executable.

You can copy this library to some other place on the machine with the
64-bit libpq.so (I assume it is the database server) and try to make the
executable use this library.

First, check if the installer executable or libdbx<n> has an RPATH set:

objdump -p -j .dynstr <executable>|egrep RUNPATH\|RPATH

If yes, and it points to the location of the 64-bit library, you are out
of
luck and the only solution I can see is to install the server in another
directory...

If no, or the RPATH points somewhere else, you can use the environment
variable
LD_LIBRARY_PATH to make the installer executable use the correct
libpq.so.4:

env LD_LIBRARY_PATH=/location/of/32bit/lib <executable>

Yours,
Laurenz Albe