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* [Bug middle-end/100571] New: bogus -Wstringop-overflow with VLA of elements larger than byte
@ 2021-05-12 18:42 msebor at gcc dot gnu.org
2021-05-12 18:43 ` [Bug middle-end/100571] " msebor at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: msebor at gcc dot gnu.org @ 2021-05-12 18:42 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100571
Bug ID: 100571
Summary: bogus -Wstringop-overflow with VLA of elements larger
than byte
Product: gcc
Version: 10.3.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
This is probably a duplicate of an existing bug already fixed in GCC 11 but not
in GCC 10. A recent enhancement to Glibc to add attribute access to a bunch of
APIs has triggered a couple of false positives in the test suite, including:
https://sourceware.org/pipermail/libc-alpha/2021-May/125987.html
and
https://sourceware.org/pipermail/libc-alpha/2021-May/126250.html
A simple test case for the problem is as follows:
$ cat t.c && gcc -O2 -S -Wall t.c
__attribute__ ((access (read_only, 1, 2))) void f (int *, int);
__SIZE_TYPE__ n;
void g (void)
{
int a[n];
a[0] = 0;
f (a, n);
}
t.t: In function 'g':
t.c:9:3: warning: 'f' specified size 18446744073709551615 exceeds maximum
object size 9223372036854775807 [-Wstringop-overflow=]
9 | f (a, n);
| ^~~~~~~~
t.t:1:49: note: in a call to function 'f' declared with attribute 'read_only
(1, 2)'
1 | __attribute__ ((access (read_only, 1, 2))) void f (int *, int);
| ^
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug middle-end/100571] bogus -Wstringop-overflow with VLA of elements larger than byte
2021-05-12 18:42 [Bug middle-end/100571] New: bogus -Wstringop-overflow with VLA of elements larger than byte msebor at gcc dot gnu.org
@ 2021-05-12 18:43 ` msebor at gcc dot gnu.org
2021-05-12 18:45 ` msebor at gcc dot gnu.org
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: msebor at gcc dot gnu.org @ 2021-05-12 18:43 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100571
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Blocks| |88443
Ever confirmed|0 |1
Last reconfirmed| |2021-05-12
Known to fail| |10.1.0, 10.2.0, 10.3.0
Known to work| |11.1.0, 9.3.0
Assignee|unassigned at gcc dot gnu.org |msebor at gcc dot gnu.org
Target Milestone|--- |10.4
Status|UNCONFIRMED |ASSIGNED
Keywords| |diagnostic
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88443
[Bug 88443] [meta-bug] bogus/missing -Wstringop-overflow warnings
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug middle-end/100571] bogus -Wstringop-overflow with VLA of elements larger than byte
2021-05-12 18:42 [Bug middle-end/100571] New: bogus -Wstringop-overflow with VLA of elements larger than byte msebor at gcc dot gnu.org
2021-05-12 18:43 ` [Bug middle-end/100571] " msebor at gcc dot gnu.org
@ 2021-05-12 18:45 ` msebor at gcc dot gnu.org
2021-05-12 21:49 ` cvs-commit at gcc dot gnu.org
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: msebor at gcc dot gnu.org @ 2021-05-12 18:45 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100571
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
URL| |https://sourceware.org/bugz
| |illa/show_bug.cgi?id=27832
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
See also https://sourceware.org/bugzilla/show_bug.cgi?id=27832
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug middle-end/100571] bogus -Wstringop-overflow with VLA of elements larger than byte
2021-05-12 18:42 [Bug middle-end/100571] New: bogus -Wstringop-overflow with VLA of elements larger than byte msebor at gcc dot gnu.org
2021-05-12 18:43 ` [Bug middle-end/100571] " msebor at gcc dot gnu.org
2021-05-12 18:45 ` msebor at gcc dot gnu.org
@ 2021-05-12 21:49 ` cvs-commit at gcc dot gnu.org
2021-05-12 21:51 ` msebor at gcc dot gnu.org
2021-05-12 21:59 ` cvs-commit at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-05-12 21:49 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100571
--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Martin Sebor
<msebor@gcc.gnu.org>:
https://gcc.gnu.org/g:0d1e4025b2bd2ce36d6ee2a5d836d31ec8a12999
commit r10-9819-g0d1e4025b2bd2ce36d6ee2a5d836d31ec8a12999
Author: Martin Sebor <msebor@redhat.com>
Date: Wed May 12 15:45:44 2021 -0600
PR middle-end/100571 - bogus -Wstringop-overflow with VLA of elements
larger than byte
gcc/ChangeLog:
PR middle-end/100571
* calls.c (maybe_warn_rdwr_sizes): Clear object size if it can't
be determined.
gcc/testsuite/ChangeLog:
PR middle-end/100571
* gcc.dg/Wstringop-overflow-67.c: New test.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug middle-end/100571] bogus -Wstringop-overflow with VLA of elements larger than byte
2021-05-12 18:42 [Bug middle-end/100571] New: bogus -Wstringop-overflow with VLA of elements larger than byte msebor at gcc dot gnu.org
` (2 preceding siblings ...)
2021-05-12 21:49 ` cvs-commit at gcc dot gnu.org
@ 2021-05-12 21:51 ` msebor at gcc dot gnu.org
2021-05-12 21:59 ` cvs-commit at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: msebor at gcc dot gnu.org @ 2021-05-12 21:51 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100571
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
Fixed in r10-9819.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug middle-end/100571] bogus -Wstringop-overflow with VLA of elements larger than byte
2021-05-12 18:42 [Bug middle-end/100571] New: bogus -Wstringop-overflow with VLA of elements larger than byte msebor at gcc dot gnu.org
` (3 preceding siblings ...)
2021-05-12 21:51 ` msebor at gcc dot gnu.org
@ 2021-05-12 21:59 ` cvs-commit at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-05-12 21:59 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100571
--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Martin Sebor <msebor@gcc.gnu.org>:
https://gcc.gnu.org/g:db514f98a383b2ebdcfe74feb80f98f406cec174
commit r12-756-gdb514f98a383b2ebdcfe74feb80f98f406cec174
Author: Martin Sebor <msebor@redhat.com>
Date: Wed May 12 15:57:34 2021 -0600
Add test for PR middle-end/100571.
gcc/testsuite:
PR middle-end/100571
* gcc.dg/Wstringop-overflow-67.c: New test.
^ permalink raw reply [flat|nested] 6+ messages in thread
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2021-05-12 18:42 [Bug middle-end/100571] New: bogus -Wstringop-overflow with VLA of elements larger than byte msebor at gcc dot gnu.org
2021-05-12 18:43 ` [Bug middle-end/100571] " msebor at gcc dot gnu.org
2021-05-12 18:45 ` msebor at gcc dot gnu.org
2021-05-12 21:49 ` cvs-commit at gcc dot gnu.org
2021-05-12 21:51 ` msebor at gcc dot gnu.org
2021-05-12 21:59 ` cvs-commit at gcc dot gnu.org
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