Re: shared object skips exporting some functions varaibles to give unresolved symbols while using it in exe

[Paul Pluzhnikov]

"Nilesh" <nileshg@gmail.com> writes:

> I am facing problem in using a so inan EXE . I created the so.
> Versions: g++ 4.4.1 on AIX 5.2 system.

Wow! Current gcc development version is 4.2.
Can I borrow your time machine?

> The EXE is using it like this:
> g++ -o EXENAME -O3 -v  -L/usr/lib/threads  -L/usr/local/lib -L/usr/lib
> -L./../../libs/aix -lstdc++ -lgcc -lgcc_eh -liiapi -lm -lnsl -lpthread
> -lc -Wl,-blibpath:/home/ngujarat/work/BiiF/libs/aix -Wl,-brtl -liif
> ../src/THIRDPARTYEMSReceiver.o  ../src/BiiMain.o

That command line is completely backwards: archive libraries are
supposed to follow objects on the link line, not preceed them.

This doesn't matter much on AIX, but will break on any other UNIX.

> But EXE compilation fails with "ld: 0711-317 ERROR: Undefined symbol:"
> Errors for some constructors. Destructors, static data members in  a
> class. Perhaps these are not referenced directly in course code.

You've omitted the most important part of the message -- precisely
which symbols are undefined.

> NOTE: I ran "nm" on libiif.so  for Undefined symbols and they are not
> found in the SO.

Are they supposed to be found there?

> WHY Is this happening?

Because you are doing something wrong, and because AIX is PITA to
work with when using GNU tools.

> Anything wrong in building SO or wrong use of SO? Flags missing?

We can't tell since you didn't tell us enough details.

Cheers,
-- 
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