c - Linking a PGI OpenACC-enabled library with gcc

Question

Briefly speaking, my question relies in between compiling/building files (using libraries) with two different compilers while exploiting OpenACC co

Answer 1

Add "-ta=tesla:nordc" to your pgcc compilation. By default PGI uses runtime dynamic compilation (RDC) for the GPU code. However RDC requires an extra link step (with nvlink) that gcc does not support. The "nordc" sub-option disables RDC so you'll be able to use OpenACC code in a library. However by disabling RDC you can no longer call external device routines from a compute region.

% pgcc -acc -ta=tesla:nordc -c libmyacc.c
% ar -cvq libmyacc.a libmyacc.o
a - libmyacc.o
% gcc f1.c -L/proj/pgi/linux86-64/16.5/lib -L/usr/lib64 -L/usr/lib/gcc/x86_64-redhat-linux/4.8.5 -L. -laccapi -laccg -laccn -laccg2 -ldl -lcudadevice -lpgmp -lnuma -lpthread -lnspgc -lpgc -lm -lgcc -lc -lgcc -lmyacc
% a.out
Hello --- Start of the main.
Sum: 500500.000
Num devices: 8
Sum2: 500500.000

Hope this helps, Mat