[Bug fortran/36683] New: -fbounds-check failure for allocated array and spread

[Bug fortran/36683] New: -fbounds-check failure for allocated array and spread

[terry at chem dot gu dot se]

Unconformable array operations are not being picked up in the following:

[tjf@rscpc28 Stoopid]$ cat badness.f90 
program fred
implicit none
real,dimension(:,:),allocatable::A
real,dimension(5)::v
allocate(A(5,5))
A=5
v=5
A=A/spread(v,2,3)
write(*,*)A(1,:)
write(*,*)A(2,:)
write(*,*)A(3,:)
write(*,*)A(4,:)
write(*,*)A(5,:)
end
[tjf@rscpc28 Stoopid]$ gfortran -Wall -O0 -W -Wtabs -g -fbounds-check -o
badness badness.f90
[tjf@rscpc28 Stoopid]$ ./badness 
  1.00000000      1.00000000      1.00000000       5.0000000       5.0000000    
  1.00000000      1.00000000      1.00000000       5.0000000       5.0000000    
  1.00000000      1.00000000      1.00000000       5.0000000       5.0000000    
  1.00000000      1.00000000      1.00000000       5.0000000       5.0000000    
  1.00000000      1.00000000      1.00000000       5.0000000       5.0000000    
[tjf@rscpc28 Stoopid]$ gfortran -v
Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: ../gcc-4.3-20080522/configure --disable-multilib
--enable-languages=c,c++,fortran
Thread model: posix
gcc version 4.3.1 20080522 (prerelease) (GCC) 


Making the spread array too big [spread(v,2,13)] is not detected either.  My
quick attempts to do both in a single code caused glibc to freak out with
"double free or corruption" detection.


-- 
           Summary: -fbounds-check failure for allocated array and spread
           Product: gcc
           Version: 4.3.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: terry at chem dot gu dot se
  GCC host triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36683

[Bug fortran/36683] -fbounds-check failure for allocated array and spread

[tkoenig at gcc dot gnu dot org]

-- 

tkoenig at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
OtherBugsDependingO|                            |34670
              nThis|                            |
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2008-07-01 19:21:45
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36683

[Bug fortran/36683] -fbounds-check failure for allocated array and spread

[tkoenig at gcc dot gnu dot org]

------- Comment #1 from tkoenig at gcc dot gnu dot org  2008-10-12 12:09 -------
The front end obligingly fills out the descriptor for
the libray with an extent of 3:

   atmp.5.dim[1].stride = 5;
    atmp.5.dim[1].lbound = 0;
    atmp.5.dim[1].ubound = 2;
    atmp.5.data = (void *) &A.6;
    atmp.5.offset = 0;
    _gfortran_spread (&atmp.5, &parm.4, &C.1545, &C.1546);

It does so without checking conformance with the rest of
the expression.


-- 

tkoenig at gcc dot gnu dot org changed:

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36683

[Bug fortran/36683] -fbounds-check failure for allocated array and spread

[dominiq at lps dot ens dot fr]

------- Comment #2 from dominiq at lps dot ens dot fr  2009-04-29 14:20 -------
pr39286 is a duplicate of this one.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36683