[Bug fortran/27715] Extented ASCII characters lead to wrong "CASE" selection

["tkoenig at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #2 from tkoenig at gcc dot gnu dot org  2006-05-28 14:53 -------
It's even worse:

$ cat cmp.f
      program main
      external isgreater
      logical isgreater
      print *,"a" > "ä"
      print *,isgreater("a", "ä")
      end

      logical function isgreater(s1, s2)
      character*1 s1, s2
      isgreater = s1 > s2
      end
$ gfortran cmp.f
$ ./a.out
 T
 F

The front end comparison is done using C's native char, whereas
the back end uses strncmp (or memcpy to fix PR 27784, hopefully soon),
which treats chars as unsigned.

Naturally, this leads to breakage when the native char type is signed.

Oh well... this doesn't look too hard to fix.  The front end should
use unsigned char.


-- 

tkoenig at gcc dot gnu dot org changed:

           What    |Removed                     |Added
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                 CC|                            |tkoenig at gcc dot gnu dot
                   |                            |org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27715