gcc/testsuite/gfortran.dg/external_procedures_1.f90

   1 ! { dg-do compile }
   2 ! This tests the patch for PR25024.
   3
   4 ! PR25024 - The external attribute for subroutine a would cause an ICE.
   5   subroutine A ()
   6     EXTERNAL A  ! { dg-error "EXTERNAL attribute conflicts with SUBROUTINE" }
   7   END
   8 function ext (y)
   9   real ext, y
  10   external ext      ! { dg-error "EXTERNAL attribute conflicts with FUNCTION" }
  11   ext = y * y
  12 end function ext
  13
  14 function ext1 (y)
  15   real ext1, y
  16   external z        ! OK no conflict
  17   ext1 = y * y
  18 end function ext1
  19
  20 program main
  21   real ext, inval
  22   external ext       ! OK, valid external reference.
  23   external main      ! { dg-error "PROGRAM attribute conflicts with EXTERNAL" }
  24   interface
  25     function ext1 (y)
  26       real ext1, y
  27       external ext1  ! { dg-error "Duplicate EXTERNAL attribute" }
  28     end function ext1
  29   end interface
  30   inval = 1.0
  31   print *, ext(inval)
  32   print *, ext1(inval)
  33   print *, inv(inval)
  34 contains
  35   function inv (y)
  36     real inv, y
  37     external inv     ! { dg-error "EXTERNAL attribute conflicts with FUNCTION" }
  38     inv = y * y * y
  39   end function inv
  40 end program main
  41