rules_fortran

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OpenMP ​

Source: examples/omp/

Link against @libomp for OpenMP support.

Prerequisites ​

Add libomp to your MODULE.bazel:

starlark
bazel_dep(name = "libomp", version = "21.1.8")

4.A. Hello OpenMP ​

omp/
├── BUILD.bazel
└── hello_omp.f90
fortran
program hello_omp
    use omp_lib
    implicit none
    integer :: tid, nthreads

    !$omp parallel private(tid)
    tid = omp_get_thread_num()
    nthreads = omp_get_num_threads()
    print *, "thread", tid, "of", nthreads
    !$omp end parallel
end program hello_omp
starlark
fortran_test(
    name = "hello_omp",
    srcs = ["hello_omp.f90"],
    copts = ["-fopenmp"],
    deps = ["@libomp"],
)
bash
bazel test //omp:hello_omp --test_output=all
 thread 0 of 16
 thread 2 of 16
 thread 1 of 16
 thread 3 of 16
 thread 8 of 16
 thread 9 of 16
 thread 11 of 16
 thread 7 of 16
 thread 4 of 16
 thread 10 of 16
 thread 5 of 16
 thread 12 of 16
 thread 13 of 16
 thread 14 of 16
 thread 6 of 16
 thread 15 of 16