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* [Bug tree-optimization/107129] New: [13 Regression] False positive -Wstringop-overflow warning with -O2 or -O3
@ 2022-10-03 10:59 daniel at constexpr dot org
2022-10-03 11:02 ` [Bug tree-optimization/107129] [13 Regression] False positive -Wstringop-overflow warning with -O2 or -O3 since r13-137-gee1cb43bc76de800 marxin at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: daniel at constexpr dot org @ 2022-10-03 10:59 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107129
Bug ID: 107129
Summary: [13 Regression] False positive -Wstringop-overflow
warning with -O2 or -O3
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: daniel at constexpr dot org
Target Milestone: ---
Created attachment 53652
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53652&action=edit
Reduced testcase
The attached testcase produces the following warning with GCC 13.0.0 20221002
(commit 3290dcf):
$ /opt/gcc-dev/bin/c++ -O2 -c test.cpp
test.cpp: In member function ‘void C::f()’:
test.cpp:39:33: warning: writing 1 byte into a region of size 0
[-Wstringop-overflow=]
39 | c[i] = e(1.f - i, i);
| ~^~~~~~~~~~~~
test.cpp:9:23: note: at offset 1 into destination object ‘C4::r’ of size 1
9 | unsigned char r;
|
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug tree-optimization/107129] [13 Regression] False positive -Wstringop-overflow warning with -O2 or -O3 since r13-137-gee1cb43bc76de800
2022-10-03 10:59 [Bug tree-optimization/107129] New: [13 Regression] False positive -Wstringop-overflow warning with -O2 or -O3 daniel at constexpr dot org
@ 2022-10-03 11:02 ` marxin at gcc dot gnu.org
2022-10-06 6:59 ` rguenth at gcc dot gnu.org
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: marxin at gcc dot gnu.org @ 2022-10-03 11:02 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107129
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Last reconfirmed| |2022-10-03
Summary|[13 Regression] False |[13 Regression] False
|positive |positive
|-Wstringop-overflow warning |-Wstringop-overflow warning
|with -O2 or -O3 |with -O2 or -O3 since
| |r13-137-gee1cb43bc76de800
Status|UNCONFIRMED |NEW
CC| |marxin at gcc dot gnu.org,
| |msebor at gcc dot gnu.org,
| |rguenth at gcc dot gnu.org
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Started with r13-137-gee1cb43bc76de800.
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug tree-optimization/107129] [13 Regression] False positive -Wstringop-overflow warning with -O2 or -O3 since r13-137-gee1cb43bc76de800
2022-10-03 10:59 [Bug tree-optimization/107129] New: [13 Regression] False positive -Wstringop-overflow warning with -O2 or -O3 daniel at constexpr dot org
2022-10-03 11:02 ` [Bug tree-optimization/107129] [13 Regression] False positive -Wstringop-overflow warning with -O2 or -O3 since r13-137-gee1cb43bc76de800 marxin at gcc dot gnu.org
@ 2022-10-06 6:59 ` rguenth at gcc dot gnu.org
2023-01-13 11:33 ` rguenth at gcc dot gnu.org
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: rguenth at gcc dot gnu.org @ 2022-10-06 6:59 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107129
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Blocks| |88443
Target Milestone|--- |13.0
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
The diagnostic is done too late.
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 tree-optimization/107129] [13 Regression] False positive -Wstringop-overflow warning with -O2 or -O3 since r13-137-gee1cb43bc76de800
2022-10-03 10:59 [Bug tree-optimization/107129] New: [13 Regression] False positive -Wstringop-overflow warning with -O2 or -O3 daniel at constexpr dot org
2022-10-03 11:02 ` [Bug tree-optimization/107129] [13 Regression] False positive -Wstringop-overflow warning with -O2 or -O3 since r13-137-gee1cb43bc76de800 marxin at gcc dot gnu.org
2022-10-06 6:59 ` rguenth at gcc dot gnu.org
@ 2023-01-13 11:33 ` rguenth at gcc dot gnu.org
2023-01-13 12:38 ` marxin at gcc dot gnu.org
2023-01-13 12:41 ` rguenth at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: rguenth at gcc dot gnu.org @ 2023-01-13 11:33 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107129
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |needs-bisection
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
We no longer warn, not sure what fixed it?
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug tree-optimization/107129] [13 Regression] False positive -Wstringop-overflow warning with -O2 or -O3 since r13-137-gee1cb43bc76de800
2022-10-03 10:59 [Bug tree-optimization/107129] New: [13 Regression] False positive -Wstringop-overflow warning with -O2 or -O3 daniel at constexpr dot org
` (2 preceding siblings ...)
2023-01-13 11:33 ` rguenth at gcc dot gnu.org
@ 2023-01-13 12:38 ` marxin at gcc dot gnu.org
2023-01-13 12:41 ` rguenth at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: marxin at gcc dot gnu.org @ 2023-01-13 12:38 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107129
--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #3)
> We no longer warn, not sure what fixed it?
r13-4598-gf8d136e50e6f82cb
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug tree-optimization/107129] [13 Regression] False positive -Wstringop-overflow warning with -O2 or -O3 since r13-137-gee1cb43bc76de800
2022-10-03 10:59 [Bug tree-optimization/107129] New: [13 Regression] False positive -Wstringop-overflow warning with -O2 or -O3 daniel at constexpr dot org
` (3 preceding siblings ...)
2023-01-13 12:38 ` marxin at gcc dot gnu.org
@ 2023-01-13 12:41 ` rguenth at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: rguenth at gcc dot gnu.org @ 2023-01-13 12:41 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107129
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Good, so fixed.
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2023-01-13 12:41 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2022-10-03 10:59 [Bug tree-optimization/107129] New: [13 Regression] False positive -Wstringop-overflow warning with -O2 or -O3 daniel at constexpr dot org
2022-10-03 11:02 ` [Bug tree-optimization/107129] [13 Regression] False positive -Wstringop-overflow warning with -O2 or -O3 since r13-137-gee1cb43bc76de800 marxin at gcc dot gnu.org
2022-10-06 6:59 ` rguenth at gcc dot gnu.org
2023-01-13 11:33 ` rguenth at gcc dot gnu.org
2023-01-13 12:38 ` marxin at gcc dot gnu.org
2023-01-13 12:41 ` rguenth at gcc dot gnu.org
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