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* [Bug c++/100721] New: Warn when assigning to temporary
@ 2021-05-21 20:52 davidfromonline at gmail dot com
2021-05-23 14:27 ` [Bug c++/100721] " redi at gcc dot gnu.org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: davidfromonline at gmail dot com @ 2021-05-21 20:52 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100721
Bug ID: 100721
Summary: Warn when assigning to temporary
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: davidfromonline at gmail dot com
Target Milestone: ---
I would like for there to be a warning that warns for the following code:
```
struct s {};
inline void f() {
s() = s();
}
```
I know that for a given type, I can prevent this from compiling if I give `s`
an lvalue-refererence-qualified assignment operator, but that requires writing
two assignment operators and two (sometimes three) constructors to get the
behavior I get today from not typing anything, and I have to apply it to every
type. It would be much nicer if I could just turn on a warning for this.
The only valid use case is if your assignment operator has a side effect that
you want.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/100721] Warn when assigning to temporary
2021-05-21 20:52 [Bug c++/100721] New: Warn when assigning to temporary davidfromonline at gmail dot com
@ 2021-05-23 14:27 ` redi at gcc dot gnu.org
2021-05-23 16:49 ` davidfromonline at gmail dot com
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: redi at gcc dot gnu.org @ 2021-05-23 14:27 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100721
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
Blocks| |87403
Keywords| |diagnostic
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87403
[Bug 87403] [Meta-bug] Issues that suggest a new warning
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/100721] Warn when assigning to temporary
2021-05-21 20:52 [Bug c++/100721] New: Warn when assigning to temporary davidfromonline at gmail dot com
2021-05-23 14:27 ` [Bug c++/100721] " redi at gcc dot gnu.org
@ 2021-05-23 16:49 ` davidfromonline at gmail dot com
2021-10-27 5:24 ` egallager at gcc dot gnu.org
2021-10-27 5:25 ` egallager at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: davidfromonline at gmail dot com @ 2021-05-23 16:49 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100721
David Stone <davidfromonline at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |davidfromonline at gmail dot com
--- Comment #1 from David Stone <davidfromonline at gmail dot com> ---
https://bugs.llvm.org/show_bug.cgi?id=50438 is the matching clang bug, so you
can coordinate on naming the flag.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/100721] Warn when assigning to temporary
2021-05-21 20:52 [Bug c++/100721] New: Warn when assigning to temporary davidfromonline at gmail dot com
2021-05-23 14:27 ` [Bug c++/100721] " redi at gcc dot gnu.org
2021-05-23 16:49 ` davidfromonline at gmail dot com
@ 2021-10-27 5:24 ` egallager at gcc dot gnu.org
2021-10-27 5:25 ` egallager at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: egallager at gcc dot gnu.org @ 2021-10-27 5:24 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100721
Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |egallager at gcc dot gnu.org
See Also| |https://bugs.llvm.org/show_
| |bug.cgi?id=50438
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to David Stone from comment #1)
> https://bugs.llvm.org/show_bug.cgi?id=50438 is the matching clang bug, so
> you can coordinate on naming the flag.
Since it looks like it was confirmed there, I'll confirm it here, too.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/100721] Warn when assigning to temporary
2021-05-21 20:52 [Bug c++/100721] New: Warn when assigning to temporary davidfromonline at gmail dot com
` (2 preceding siblings ...)
2021-10-27 5:24 ` egallager at gcc dot gnu.org
@ 2021-10-27 5:25 ` egallager at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: egallager at gcc dot gnu.org @ 2021-10-27 5:25 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100721
Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2021-10-27
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #2)
> (In reply to David Stone from comment #1)
> > https://bugs.llvm.org/show_bug.cgi?id=50438 is the matching clang bug, so
> > you can coordinate on naming the flag.
>
> Since it looks like it was confirmed there, I'll confirm it here, too.
Oops, but for real this time
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2021-10-27 5:25 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2021-05-21 20:52 [Bug c++/100721] New: Warn when assigning to temporary davidfromonline at gmail dot com
2021-05-23 14:27 ` [Bug c++/100721] " redi at gcc dot gnu.org
2021-05-23 16:49 ` davidfromonline at gmail dot com
2021-10-27 5:24 ` egallager at gcc dot gnu.org
2021-10-27 5:25 ` egallager at gcc dot gnu.org
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