Undefined reference to `omp_get_max_threads_'

Question

I'm getting the following errors trying to compile a project: (fortran, using gfortran)

undefined reference to `omp_get_max_threads_'

undefined reference to `omp_get_thread_num_'

Problem is, my GCC version is 4.4.3, which was suppose to support OpenMP.

Solution 1

With gcc, you need to compile and link with -fopenmp to enable OpenMP. Other compilers have different options; with intel it's -openmp, with pgi it's -mp, etc.

Solution 2

The code needs to be compiled with -fopenmp.

Solution 3

gcc -program.c -o obj -fopenmp