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program main
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use, intrinsic :: iso_fortran_env, only: stderr=>error_unit
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use omp_lib, only: omp_get_max_threads
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implicit none
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integer :: N, ierr
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character(80) :: buf ! can't be allocatable in this use case. Just set arbitrarily large.
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call get_environment_variable('OMP_NUM_THREADS', buf, status=ierr)
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if (ierr/=0) error stop 'environment variable OMP_NUM_THREADS could not be read'
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read(buf,*) N
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if (omp_get_max_threads() /= N) then
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write(stderr, *) 'Max Fortran threads: ', omp_get_max_threads(), '!=', N
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error stop
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endif
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end program
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