PGI User Forum

[John Wohlbier]

I'm trying to link my program with pgCC. The program has fortran code that uses OpenACC. I get unresolved symbols like:

undefined reference to `__pgi_cu_close'

I found libacc1.a and libacc1cu.a contain some of the missing symbols, but if I link with both of those I get multiply defined symbols. Can you tell me which libraries I should link to?

PGI 12.9.0

Thanks

[mkcolg]

Hi John,

Until 13.0 is out next week and we have OpenACC support in C++, the easiest thing to do would be to use the Fortran driver, pgfortran, to link. You can then just add the flag "-acc" to link OpneACC, "-pgcpplibs" to get the C++ libraries, and "-Mnomain".

"pgfortran -acc -Mnomain -pgcpplibs ...object files...".

Hope this helps,
Mat

[John Wohlbier]

When mixing C++ and fortran CMake chooses the C++ compiler for the linker. I'd prefer to stick with it's choice. But this does result in some head standing, including manually specifying the f90main.o file in the link line, and the manual addition of the accelerator libraries. I found by trial and error that if I link
-lacc1cump -lacc1mp -lacc1
then the symbols all get resolved.

So my link line looks something like:
/projects/opt/pgi/linux86-64/12.9/bin/pgCC -mp -g -O0 /projects/opt/pgi/linux86-64/12.9/lib/f90main.o ${OBJECTS} -o ${EXE} -lacc1cump -lacc1mp -lacc1 /projects/opt/cuda/cuda-5.0/lib64/libcudart.so -lcuda /home/mpi/openmpi/1.5.3-gcc-4.5.1-mar.16.11/lib/libmpi_cxx.so /home/mpi/openmpi/1.5.3-gcc-4.5.1-mar.16.11/lib/libmpi.so -ldl -lnsl -lutil -lm -ldl -lnsl -lutil -lm -lpgf90 -lpgf90_rpm1 -lpgf902 -lpgf90rtl -lpgftnrtl -lrt -Wl,-rpath,/projects/opt/cuda/cuda-5.0/lib64:/home/mpi/openmpi/1.5.3-gcc-4.5.1-mar.16.11/lib

[mkcolg]

[John Wohlbier]