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* [Bug lto/80379] Redundant note: code may be misoptimized unless -fno-strict-aliasing is used
[not found] <bug-80379-4@http.gcc.gnu.org/bugzilla/>
@ 2020-11-09 7:30 ` hubicka at gcc dot gnu.org
2024-06-11 10:21 ` Eric.Diaz.Fernandez at eurid dot eu
2024-06-11 15:26 ` andi-gcc at firstfloor dot org
2 siblings, 0 replies; 3+ messages in thread
From: hubicka at gcc dot gnu.org @ 2020-11-09 7:30 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80379
--- Comment #3 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
The problem here is that the hint is output at decl merging and
-fno-strict-aliasing is a function local flag. At that time we do not even know
what functions will be since units are not streamed in yet. This means that we
do not know if some unit has function that is -fno-strict-aliasing. So
supressing the warning does not fit the implementation very easily :(
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug lto/80379] Redundant note: code may be misoptimized unless -fno-strict-aliasing is used
[not found] <bug-80379-4@http.gcc.gnu.org/bugzilla/>
2020-11-09 7:30 ` [Bug lto/80379] Redundant note: code may be misoptimized unless -fno-strict-aliasing is used hubicka at gcc dot gnu.org
@ 2024-06-11 10:21 ` Eric.Diaz.Fernandez at eurid dot eu
2024-06-11 15:26 ` andi-gcc at firstfloor dot org
2 siblings, 0 replies; 3+ messages in thread
From: Eric.Diaz.Fernandez at eurid dot eu @ 2024-06-11 10:21 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80379
Eric Diaz Fernandez <Eric.Diaz.Fernandez at eurid dot eu> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |Eric.Diaz.Fernandez at eurid dot e
| |u
--- Comment #4 from Eric Diaz Fernandez <Eric.Diaz.Fernandez at eurid dot eu> ---
I believe I've hit that bug. I was about to post a report it when I found this
one.
When building one of my programs with -flto but without -fno-strict-aliasing
the resulting assembly misses the call to an initialization function.
The current workaround suggested to the maintainer is to not use -flto
Is there anything I can add to help fixing the issue?
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug lto/80379] Redundant note: code may be misoptimized unless -fno-strict-aliasing is used
[not found] <bug-80379-4@http.gcc.gnu.org/bugzilla/>
2020-11-09 7:30 ` [Bug lto/80379] Redundant note: code may be misoptimized unless -fno-strict-aliasing is used hubicka at gcc dot gnu.org
2024-06-11 10:21 ` Eric.Diaz.Fernandez at eurid dot eu
@ 2024-06-11 15:26 ` andi-gcc at firstfloor dot org
2 siblings, 0 replies; 3+ messages in thread
From: andi-gcc at firstfloor dot org @ 2024-06-11 15:26 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80379
--- Comment #5 from Andi Kleen <andi-gcc at firstfloor dot org> ---
This bug is about printing a unnecessary message. If your code is actually
miscompiled even with -fno-strict-aliasing set (so it is ignored somewhere) it
is something different and you would need a test case to debug.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2024-06-11 15:26 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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[not found] <bug-80379-4@http.gcc.gnu.org/bugzilla/>
2020-11-09 7:30 ` [Bug lto/80379] Redundant note: code may be misoptimized unless -fno-strict-aliasing is used hubicka at gcc dot gnu.org
2024-06-11 10:21 ` Eric.Diaz.Fernandez at eurid dot eu
2024-06-11 15:26 ` andi-gcc at firstfloor dot org
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