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From: "jv244 at cam dot ac dot uk" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/39772]  New: add a correctness check for the size intrinsic to -fbounds-check
Date: Tue, 14 Apr 2009 21:25:00 -0000	[thread overview]
Message-ID: <bug-39772-6642@http.gcc.gnu.org/bugzilla/> (raw)

the following program

INTEGER*8 :: N
INTEGER, DIMENSION(:), ALLOCATABLE :: data
N=2_8**32
write(6,*) N
ALLOCATE(data(N))
write(6,*) SIZE(data,1)
END

prints 

           4294967296
           0

It would be useful if a check for overflow of size could be added to e.g.
-fbounds-check (a rather natural place I would say) so that this kind of
undefined behavior could be detected at run time. I'm aware of the fact that
this is fixed more fundamentally with F2003.


-- 
           Summary: add a correctness check for the size intrinsic to -
                    fbounds-check
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jv244 at cam dot ac dot uk


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39772


             reply	other threads:[~2009-04-14 21:25 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-04-14 21:25 jv244 at cam dot ac dot uk [this message]
2009-04-14 21:26 ` [Bug fortran/39772] " jv244 at cam dot ac dot uk
2009-04-15 12:30 ` dfranke at gcc dot gnu dot org
2009-04-15 13:22 ` jv244 at cam dot ac dot uk
2009-04-15 13:57 ` kargl at gcc dot gnu dot org
2009-04-15 17:04 ` jv244 at cam dot ac dot uk
2009-04-15 17:44 ` kargl at gcc dot gnu dot org
2009-04-16 17:32 ` [Bug fortran/39772] SIZE intrinsic ignores optional KIND argument kargl at gcc dot gnu dot org
2009-04-16 17:34 ` kargl at gcc dot gnu dot org
2009-04-16 17:38 ` jv244 at cam dot ac dot uk
2009-04-16 19:27 ` [Bug fortran/39772] add a correctness check for the size intrinsic to -fbounds-check kargl at gcc dot gnu dot org
2009-05-04 20:24 ` mikael at gcc dot gnu dot org

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