[Bug c/35587] -Warray-bounds does not work at all or does not find all trivial cases, and :works only with -O2 or -O3

[Bug c/35587] -Warray-bounds does not work at all or does not find all trivial cases, and :works only with -O2 or -O3

[manu at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35587

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |schuh.robert at gmail dot
                   |                            |com

--- Comment #5 from Manuel López-Ibáñez <manu at gcc dot gnu.org> 2010-11-25 11:16:44 UTC ---
*** Bug 46657 has been marked as a duplicate of this bug. ***

[Bug c/35587] -Warray-bounds does not work at all or does not find all trivial cases, and :works only with -O2 or -O3

[manu at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35587

--- Comment #6 from Manuel López-Ibáñez <manu at gcc dot gnu.org> 2010-11-25 11:22:59 UTC ---
*** Bug 46657 has been marked as a duplicate of this bug. ***

[Bug c/35587] -Warray-bounds does not work at all or does not find all trivial cases, and :works only with -O2 or -O3

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35587

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> 2010-11-25 11:42:54 UTC ---
*** Bug 46657 has been marked as a duplicate of this bug. ***

[Bug middle-end/35587] -Warray-bounds does not work at all or does not find all trivial cases, and :works only with -O2 or -O3

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=35587

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |xinliangli at gmail dot com

--- Comment #8 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
*** Bug 52954 has been marked as a duplicate of this bug. ***
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Subject: [Bug c++/52954] Missing bounds check warning without optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52954

--- Comment #5 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Ops, wrong PR. Try again: Duplicate.

*** This bug has been marked as a duplicate of bug 35587 ***
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Subject: [Bug lto/65995] LTO: ICE in add_symbol_to_partition_1 for debug build
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ide995

Daniel Starke <daniel.f.starke at freenet dot de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to fail|                            |5.2.0

--- Comment #5 from Daniel Starke <daniel.f.starke at freenet dot de> ---
The bug is still present in GCC 5.2.0.

[Bug middle-end/35587] -Warray-bounds does not work at all or does not find all trivial cases, and :works only with -O2 or -O3

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=35587

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2008-03-17 14:05:57         |2020-3-23
      Known to fail|                            |10.0, 4.3.5, 4.4.7, 4.8.5,
                   |                            |4.9.4, 5.4.0, 6.4.0, 7.3.0,
                   |                            |8.3.0, 9.1.0

--- Comment #12 from Martin Sebor <msebor at gcc dot gnu.org> ---
Reconfirmed with GCC 10.

[Bug middle-end/35587] -Warray-bounds does not work at all or does not find all trivial cases, and :works only with -O2 or -O3

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=35587

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |haoxintu at gmail dot com

--- Comment #13 from Martin Sebor <msebor at gcc dot gnu.org> ---
*** Bug 95461 has been marked as a duplicate of this bug. ***

[Bug middle-end/35587] -Warray-bounds does not work at all or does not find all trivial cases, and :works only with -O2 or -O3

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=35587

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |fredrik.hederstierna@securi
                   |                            |tas-direct.com

--- Comment #14 from Martin Sebor <msebor at gcc dot gnu.org> ---
*** Bug 102346 has been marked as a duplicate of this bug. ***

[Bug c/35587] -Warray-bounds does not work at all or does not find all trivial cases, and :works only with -O2 or -O3

[nikos42 at gmail dot com]

------- Comment #4 from nikos42 at gmail dot com  2008-05-03 09:43 -------
Confirmed with gcc 4.3.1. Complete version info:

Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure linux gnu
Thread model: posix
gcc version 4.3.1 20080401 (prerelease) (Debian 4.3.0-3) 

Regards,
Nicolas


-- 

nikos42 at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |nikos42 at gmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35587

[Bug c/35587] -Warray-bounds does not work at all or does not find all trivial cases, and :works only with -O2 or -O3

[rguenth at gcc dot gnu dot org]

------- Comment #3 from rguenth at gcc dot gnu dot org  2008-03-17 14:05 -------
Hm, with gcc 4.2 I get

gcc-4.2 -c t.c -O2 -Wall
t.c: In function 'main':
t.c:5: warning: array subscript is below array bounds
t.c:7: warning: array subscript is above array bounds
t.c:8: warning: array subscript is above array bounds
t.c:9: warning: array subscript is above array bounds

(the warning in line 11 is missing as the constant is
propagated and the load from a[15] CSEd - this is a very hard
to fix implementation limit.  You'd fix the case in line 9
and then the issue in line 11 would pop up.)

with 4.3 I indeed see

gcc-4.3 -c t.c -O2 -Wall

(nothing)

because all invalid stores are deleted from the code and the only
used value (a[15]) is propagated from the store a[15] = 0 and thus
replaced by the constant 0.  Again a hard to fix implementation
issue - after all these invalid stores/loads invoke undefined
behavior which is why we just "optimized" them.

IMHO for these very simple cases the frontend should already warn
(even at -O0 and -O1) and not rely on the code surviving until VRP.
(The issue is that we in this way would also warn in dead code regions,
which may be a problem on its own).

Note this is not accepts-invalid as it is only undefined at runtime.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mueller at gcc dot gnu dot
                   |                            |org, rguenth at gcc dot gnu
                   |                            |dot org
           Severity|major                       |enhancement
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
           Keywords|accepts-invalid             |
   Last reconfirmed|0000-00-00 00:00:00         |2008-03-17 14:05:57
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35587

[Bug c/35587] -Warray-bounds does not work at all or does not find all trivial cases, and :works only with -O2 or -O3

[karsten_burger at gmx dot de]

-- 

karsten_burger at gmx dot de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |major


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35587

[Bug c/35587] -Warray-bounds does not work at all or does not find all trivial cases, and works only with -O2 or -O3

[karsten_burger at gmx dot de]

------- Comment #2 from karsten_burger at gmx dot de  2008-03-14 17:08 -------
Created an attachment (id=15322)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=15322&action=view)
assembler output using gcc option -save-temps


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35587

[Bug c/35587] -Warray-bounds does not work at all or does not find all trivial cases, and works only with -O2 or -O3

[karsten_burger at gmx dot de]

------- Comment #1 from karsten_burger at gmx dot de  2008-03-14 17:07 -------
Created an attachment (id=15321)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=15321&action=view)
version which does not create any warning


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35587