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! MRE: External procedure called multiple times in same subroutine
! This tests that interface creation for external procedures does not
! create duplicate symbols when the procedure is called multiple times.
subroutine test_select(select_fn, n, wr, wi, result)
implicit none
logical, external :: select_fn
integer, intent(in) :: n
real, intent(in) :: wr(*), wi(*)
real, intent(out) :: result(*)
integer :: i
logical :: flag
! First call to select_fn
do i = 1, n
result(i) = 0.0
if (select_fn(wr(i), wi(i))) then
result(i) = 1.0
end if
end do
! Second call to select_fn (same scope - must not create duplicate interface)
do i = 1, n
flag = select_fn(wr(i), wi(i))
if (flag) result(i) = result(i) + 1.0
end do
end subroutine
logical function my_select(x, y)
implicit none
real, intent(in) :: x, y
my_select = x > 0.0
end function
program test_present_05
implicit none
real :: wr(3), wi(3), r(3)
logical, external :: my_select
wr = [1.0, -1.0, 2.0]
wi = [0.0, 0.0, 0.0]
call test_select(my_select, 3, wr, wi, r)
! Expected: r(1)=2.0 (selected twice), r(2)=0.0 (never selected), r(3)=2.0 (selected twice)
if (abs(r(1) - 2.0) > 1e-6) error stop
if (abs(r(2) - 0.0) > 1e-6) error stop
if (abs(r(3) - 2.0) > 1e-6) error stop
print *, "PASS"
end program
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