gcc/testsuite/gfortran.dg/value_4.f90

   1 ! { dg-do run }
   2 ! { dg-additional-sources value_4.c }
   3 ! { dg-options "-ff2c -w -O0" }
   4 !
   5 ! Tests the functionality of the patch for PR29642, which requested the
   6 ! implementation of the F2003 VALUE attribute for gfortran, by calling
   7 ! external C functions by value and by reference.  This is effectively
   8 ! identical to c_by_val_1.f, which does the same for %VAL.
   9 !
  10 ! Contributed by Paul Thomas  <pault@gcc.gnu.org>
  11 !
  12 module global
  13   interface delta
  14     module procedure deltai, deltar, deltac
  15   end interface delta
  16   real(4) :: epsi = epsilon (1.0_4)
  17 contains
  18   function deltai (a, b) result (c)
  19     integer(4) :: a, b
  20     logical :: c
  21     c = (a /= b)
  22   end function deltai
  23
  24   function deltar (a, b) result (c)
  25     real(4) :: a, b
  26     logical :: c
  27     c = (abs (a-b) > epsi)
  28   end function deltar
  29
  30   function deltac (a, b) result (c)
  31     complex(4) :: a, b
  32     logical :: c
  33     c = ((abs (real (a-b)) > epsi).or.(abs (aimag (a-b)) > epsi))
  34   end function deltac
  35 end module global
  36
  37 program value_4
  38   use global
  39   interface
  40     function f_to_f (x, y)
  41       real(4), pointer :: f_to_f
  42       real(4) :: x, y
  43       value :: x
  44     end function f_to_f
  45   end interface
  46
  47   interface
  48     function i_to_i (x, y)
  49       integer(4), pointer :: i_to_i
  50       integer(4) :: x, y
  51       value :: x
  52     end function i_to_i
  53   end interface
  54
  55   interface
  56     complex(4) function c_to_c (x, y)
  57       complex(4) :: x, y
  58       value :: x
  59     end function c_to_c
  60   end interface
  61
  62   real(4)       a, b, c
  63   integer(4)    i, j, k
  64   complex(4)    u, v, w
  65
  66   a = 42.0
  67   b = 0.0
  68   c = a
  69   b = f_to_f (a, c)
  70   if (delta ((2.0 * a), b)) STOP 1
  71
  72   i = 99
  73   j = 0
  74   k = i
  75   j = i_to_i (i, k)
  76   if (delta ((3_4 * i), j)) STOP 2
  77
  78   u = (-1.0, 2.0)
  79   v = (1.0, -2.0)
  80   w = u
  81   v = c_to_c (u, w)
  82   if (delta ((4.0 * u), v)) STOP 3
  83 end program value_4