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! { dg-do run }
! See pr117643, this tests passing of the optional argument when it is
! not present.
program foo
use iso_c_binding, only : c_null_char, c_char, f_c_string, c_size_t
implicit none
logical asis
character(len=6, kind=c_char) :: s1
character(len=:, kind=c_char), allocatable :: s2
interface
!
! strlen() counts up to '\0', and excludes it from the count
!
function strlen(s) bind(c,name="strlen")
import c_char, c_size_t
integer(c_size_t) strlen
character(len=1,kind=c_char), intent(in) :: s(*)
end function strlen
end interface
s1 = 'abc '
asis = .true.
call check (asis) ! OK
asis = .false.
call check (asis) ! OK
call check () ! segfault fixed
contains
subroutine check (asis)
logical, optional, intent(in) :: asis
s2 = f_c_string(s1, asis)
if (present(asis)) then
if (asis) then
if (int(strlen(s2)) /= 6) then
stop 1
endif
else
if (len_trim(s1) /= int(strlen(s2))) then
stop 2
endif
endif
endif
end subroutine check
end program foo
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