[Bug fortran/13615] New: g77 -Wuninitialized doesn't produce warning on characters

[Bug fortran/13615] New: g77 -Wuninitialized doesn't produce warning on characters

[smelkov at mph1 dot phys dot spbu dot ru]

g77 should warn that 'c' might be used uninitialized, while the same code templated 
with character changed to integer or 'double precision' generates the warning. 
 
 
----test_uninitialized.f------------------------- 
c g77 -Wuninitialized -c -O  test_uninitialized.f  
c test_uninitialized.f: In subroutine `warn_integer': 
c test_uninitialized.f:15: warning: `a' might be used uninitialized in this function 
c 
c *** THERE IS NO *** 
c test_uninitialized.f:29: warning: `c' might be used uninitialized ... 
 
c     says that a might be used uninitialized 
      subroutine warn_integer 
      implicit none 
 
      integer b 
      common /xxx/ b 
 
      integer a 
 
      b = a 
      end 
 
 
c     should say that a might be used uninitialized, 
c     but doesn't! 
      subroutine warn_character 
      implicit none 
 
      character d 
      common /yyy/ d 
 
      character c 
 
      d = c 
      end 
----------------- 
 
[kirr@roro Si2O7H6.molcas]$ g77 -v 
Reading specs from /mnt/tmini/kirr/local/gcc-3.3.2/lib/gcc-lib/i686-pc-linux-gnu/3.3.2/specs 
Configured with: ../gcc-3.3.2/configure --prefix=/mnt/tmini/kirr/local/gcc-3.3.2 --with-gnu-as 
--with-gnu-ld --enable-threads=posix --enable-languages=c,c++,f77 --enable-checking 
--disable-nls 
Thread model: posix 
gcc version 3.3.2

-- 
           Summary: g77 -Wuninitialized doesn't produce warning on
                    characters
           Product: gcc
           Version: 3.3.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: smelkov at mph1 dot phys dot spbu dot ru
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13615

[Bug fortran/13615] g77 -Wuninitialized doesn't produce warning on characters

[smelkov at mph1 dot phys dot spbu dot ru]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |diagnostic


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13615

[Bug fortran/13615] g77 -Wuninitialized doesn't produce warning on characters

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-01-08 18:26 -------
I can reproduce this on 3.4, I have not tried gfortran on the tree-ssa yet.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2004-01-08 18:26:33
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13615

[Bug fortran/13615] g77 -Wuninitialized doesn't produce warning on characters

[dhazeghi at yahoo dot com]

------- Additional Comments From dhazeghi at yahoo dot com  2004-01-25 18:04 -------
gfortran gives...

bash-2.05b$ dara/gcc-3.5-tree-ssa/bin/gfortran -Wuninitialized foo.f 
f951: warning: -Wuninitialized is not supported without -O
foo.f: In function `warn_character':
foo.f:23: fatal error: gfc_todo: Not Implemented: CHARACTER inside COMMON block or 
EQUIVALENCE list
compilation terminated.


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2004-01-08 18:26:33         |2004-01-25 18:04:22
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13615

[Bug fortran/13615] [gfortran] g77 -Wuninitialized doesn't produce warning on characters

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-04-26 04:24 -------
The reason why it does not complain is that STRING(N:N) is not folded to be just an 
access.

;; Function warn_character (warn_character__)

warn_character ()
{
  int1 c[1];

<bb 0>:
  _gfortran_copy_string (1, &yyy.d, 1, &c);
  return;

}

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
  BugsThisDependsOn|                            |12456
           Severity|normal                      |enhancement
   Last reconfirmed|2004-01-25 18:04:22         |2004-04-26 04:24:56
               date|                            |
            Summary|g77 -Wuninitialized doesn't |[gfortran] g77 -
                   |produce warning on          |Wuninitialized doesn't
                   |characters                  |produce warning on
                   |                            |characters
   Target Milestone|---                         |tree-ssa


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13615

[Bug fortran/13615] [gfortran] g77 -Wuninitialized doesn't produce warning on characters

[tobi at gcc dot gnu dot org]

------- Additional Comments From tobi at gcc dot gnu dot org  2004-05-16 19:03 -------
To make this clear: the ICE in gfortran is gone. It still doesn't give the
diagnostic, though.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13615

[Bug fortran/13615] [gfortran] g77 -Wuninitialized doesn't produce warning on characters

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-05-18 18:29 -------
After a fix (which is semi-broken) for PR 12456, the problem now is that characters in common blocks 
are stored as arrays.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13615

[Bug fortran/13615] [gfortran] g77 -Wuninitialized doesn't produce warning on characters

[pinskia at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|3.5.0                       |---


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13615