gcc/testsuite/gfortran.dg/equiv_7.f90

   1 ! { dg-do run }
   2 ! { dg-options "-std=gnu" }
   3 ! Tests the fix for PR29786, in which initialization of overlapping
   4 ! equivalence elements caused a compile error.
   5 !
   6 ! Contributed by Bernhard Fischer <aldot@gcc.gnu.org>
   7 !
   8 block data
   9   common /global/ ca (4)
  10   integer(4) ca, cb
  11   equivalence (cb, ca(3))
  12   data (ca(i), i = 1, 2) /42,43/, ca(4) /44/
  13   data cb /99/
  14 end block data
  15
  16   integer(4), parameter :: abcd = ichar ("a") + 256_4 * (ichar("b") + 256_4 * &
  17                                  (ichar ("c") + 256_4 * ichar ("d")))
  18   logical(4), parameter :: bigendian = transfer (abcd, "wxyz") .eq. "abcd"
  19
  20   call int4_int4
  21   call real4_real4
  22   call complex_real
  23   call check_block_data
  24   call derived_types         ! Thanks to Tobias Burnus for this:)
  25 !
  26 ! This came up in PR29786 comment #9 - Note the need to treat endianess
  27 ! Thanks Dominique d'Humieres:)
  28 !
  29   if (bigendian) then
  30     if (d1mach_little (1) .ne. transfer ((/0_4, 1048576_4/), 1d0)) STOP 1
  31     if (d1mach_little (2) .ne. transfer ((/-1_4,2146435071_4/), 1d0)) STOP 2
  32   else
  33     if (d1mach_big (1) .ne. transfer ((/1048576_4, 0_4/), 1d0)) STOP 3
  34     if (d1mach_big (2) .ne. transfer ((/2146435071_4,-1_4/), 1d0)) STOP 4
  35   end if
  36 !
  37 contains
  38   subroutine int4_int4
  39       integer(4)         a(4)
  40       integer(4)         b
  41       equivalence (b,a(3))
  42       data b/3/
  43       data (a(i), i=1,2) /1,2/, a(4) /4/
  44       if (any (a .ne. (/1, 2, 3, 4/))) STOP 5
  45   end subroutine int4_int4
  46   subroutine real4_real4
  47       real(4)         a(4)
  48       real(4)         b
  49       equivalence (b,a(3))
  50       data b/3.0_4/
  51       data (a(i), i=1,2) /1.0_4, 2.0_4/, &
  52             a(4) /4.0_4/
  53       if (sum (abs (a -  &
  54           (/1.0_4, 2.0_4, 3.0_4, 4.0_4/))) > 1.0e-6) STOP 6
  55   end subroutine real4_real4
  56   subroutine complex_real
  57       complex(4)         a(4)
  58       real(4)            b(2)
  59       equivalence (b,a(3))
  60       data b(1)/3.0_4/, b(2)/4.0_4/
  61       data (a(i), i=1,2) /(0.0_4, 1.0_4),(2.0_4,0.0_4)/, &
  62             a(4) /(0.0_4,5.0_4)/
  63       if (sum (abs (a - (/(0.0_4, 1.0_4),(2.0_4, 0.0_4), &
  64           (3.0_4, 4.0_4),(0.0_4, 5.0_4)/)))  > 1.0e-6) STOP 7
  65   end subroutine complex_real
  66   subroutine check_block_data
  67       common /global/ ca (4)
  68       equivalence (ca(3), cb)
  69       integer(4) ca
  70       if (any (ca .ne. (/42, 43, 99, 44/))) STOP 8
  71   end subroutine check_block_data
  72   function d1mach_little(i) result(d1mach)
  73     implicit none
  74     double precision d1mach,dmach(5)
  75     integer i
  76     integer*4 large(4),small(4)
  77     equivalence ( dmach(1), small(1) )
  78     equivalence ( dmach(2), large(1) )
  79     data small(1),small(2) / 0,   1048576/
  80     data large(1),large(2) /-1,2146435071/
  81     d1mach = dmach(i)
  82   end function d1mach_little
  83   function d1mach_big(i) result(d1mach)
  84     implicit none
  85     double precision d1mach,dmach(5)
  86     integer i
  87     integer*4 large(4),small(4)
  88     equivalence ( dmach(1), small(1) )
  89     equivalence ( dmach(2), large(1) )
  90     data small(1),small(2) /1048576,    0/
  91     data large(1),large(2) /2146435071,-1/
  92     d1mach = dmach(i)
  93   end function d1mach_big
  94     subroutine derived_types
  95       TYPE T1
  96         sequence
  97         character (3) :: chr
  98         integer :: i = 1
  99         integer :: j
 100         END TYPE T1
 101       TYPE T2
 102         sequence
 103         character (3) :: chr = "wxy"
 104         integer :: i = 1
 105         integer :: j = 4
 106       END TYPE T2
 107       TYPE(T1) :: a1
 108       TYPE(T2) :: a2
 109       EQUIVALENCE(a1,a2)         ! { dg-warning="mixed|components" }
 110       if (a1%chr .ne. "wxy") STOP 9
 111       if (a1%i .ne. 1) STOP 10
 112       if (a1%j .ne. 4) STOP 11
 113       end subroutine derived_types
 114 end