gcc/testsuite/gfortran.dg/char_comparison_1.f

   1 C { dg-do run }
   2 C { dg-options "-std=legacy" }
   3 C
   4 C     PR 30525 - comparisons with padded spaces were done
   5 C     signed.
   6       program main
   7       character*2 c2
   8       character*1 c1, c3, c4
   9 C
  10 C  Comparison between char(255) and space padding
  11 C
  12       c2 = 'a' // char(255)
  13       c1 = 'a'
  14       if (.not. (c2 .gt. c1)) STOP 1
  15 C
  16 C  Comparison between char(255) and space
  17 C
  18       c3 = ' '
  19       c4 = char(255)
  20       if (.not. (c4 .gt. c3)) STOP 2
  21
  22 C
  23 C  Check constant folding
  24 C
  25       if (.not. ('a' // char(255) .gt. 'a')) STOP 3
  26
  27       if (.not. (char(255) .gt. 'a')) STOP 4
  28       end