gcc/testsuite/gfortran.dg/recursive_reference_1.f90

   1 ! { dg-do compile }
   2 ! Tests the patch for PR27613, in which directly recursive, scalar
   3 ! functions were generating an "unclassifiable statement" error
   4 ! for the recursive statement(s).  This was subsequently determined
   5 ! to be wrong code and the error on 'bad_stuff' was removed.
   6 ! See 12.5.2.1 of the standard and PR30876.
   7 !
   8 ! Based on PR testcase by Nicolas Bock  <nicolasbock@gmail.com>
   9 !
  10 program test
  11   if (original_stuff(1) .ne. 5) STOP 1
  12   if (scalar_stuff(-4) .ne. 10) STOP 2
  13   if (any (array_stuff((/-19,-30/)) .ne. (/25,25/))) STOP 3
  14 contains
  15   recursive function original_stuff(n)
  16     integer :: original_stuff
  17     integer :: n
  18     original_stuff = 1
  19     if(n < 5) then
  20       original_stuff = original_stuff + original_stuff (n+1) ! { dg-error "name of a recursive function" }
  21     endif
  22   end function original_stuff
  23
  24   recursive function scalar_stuff(n) result (tmp)
  25     integer :: tmp
  26     integer :: n
  27     tmp = 1
  28     if(n < 5) then
  29       tmp = tmp + scalar_stuff (n+1)
  30     endif
  31   end function scalar_stuff
  32
  33   recursive function array_stuff(n) result (tmp)
  34     integer :: tmp (2)
  35     integer :: n (2)
  36     tmp = 1
  37     if(maxval (n) < 5) then
  38       tmp = tmp + array_stuff (n+1)
  39     endif
  40   end function array_stuff
  41
  42   recursive function bad_stuff(n)
  43     integer :: bad_stuff (2)
  44     integer :: n(2)
  45     bad_stuff = 1
  46     if(maxval (n) < 5) then
  47       bad_stuff = bad_stuff + bad_stuff (n+1)
  48     endif
  49   end function bad_stuff
  50 end program test