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! { dg-do run }
!
! PR fortran/50981
! The program used to dereference a NULL pointer when trying to access
! an optional dummy argument to be passed to an elemental subprocedure.
!
! Original testcase from Andriy Kostyuk <kostyuk@fias.uni-frankfurt.de>
PROGRAM test
IMPLICIT NONE
REAL(KIND=8), DIMENSION(2) :: aa, rr
aa(1)=10.
aa(2)=11.
! WRITE(*,*) 'Both f1 and ff work if the optional parameter is present:'
rr=f1(aa,1)
! WRITE(*,*) ' rr(1)=', rr(1), ' rr(2)=', rr(2)
IF (ANY(rr /= (/ 110, 132 /))) CALL ABORT
rr=0
rr=ff(aa,1)
! WRITE(*,*) ' rr(1)=', rr(1), ' rr(2)=', rr(2)
IF (ANY(rr /= (/ 110, 132 /))) CALL ABORT
! WRITE(*,*) 'But only f1 works if the optional parameter is absent:'
rr=0
rr=f1(aa)
! WRITE(*,*) ' rr(1)=', rr(1), ' rr(2)=', rr(2)
IF (ANY(rr /= (/ 110, 132 /))) CALL ABORT
rr = 0
rr=ff(aa)
! WRITE(*,*) ' rr(1)=', rr(1), ' rr(2)=', rr(2)
IF (ANY(rr /= (/ 110, 132 /))) CALL ABORT
CONTAINS
ELEMENTAL REAL(KIND=8) FUNCTION ff(a,b)
IMPLICIT NONE
REAL(KIND=8), INTENT(IN) :: a
INTEGER, INTENT(IN), OPTIONAL :: b
REAL(KIND=8), DIMENSION(2) :: ac
ac(1)=a
ac(2)=a**2
ff=SUM(gg(ac,b))
END FUNCTION ff
ELEMENTAL REAL(KIND=8) FUNCTION f1(a,b)
IMPLICIT NONE
REAL(KIND=8), INTENT(IN) :: a
INTEGER, INTENT(IN), OPTIONAL :: b
REAL(KIND=8), DIMENSION(2) :: ac
ac(1)=a
ac(2)=a**2
f1=gg(ac(1),b)+gg(ac(2),b) ! This is the same as in ff, but without using the elemental feature of gg
END FUNCTION f1
ELEMENTAL REAL(KIND=8) FUNCTION gg(a,b)
IMPLICIT NONE
REAL(KIND=8), INTENT(IN) :: a
INTEGER, INTENT(IN), OPTIONAL :: b
INTEGER ::b1
IF(PRESENT(b)) THEN
b1=b
ELSE
b1=1
ENDIF
gg=a**b1
END FUNCTION gg
END PROGRAM test
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