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* [Bug c++/113640] New: 'deducing this' lambda invoked multiple times unexpectedly
@ 2024-01-28 15:51 hewillk at gmail dot com
2024-01-28 15:54 ` [Bug c++/113640] " hewillk at gmail dot com
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: hewillk at gmail dot com @ 2024-01-28 15:51 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113640
Bug ID: 113640
Summary: 'deducing this' lambda invoked multiple times
unexpectedly
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: hewillk at gmail dot com
Target Milestone: ---
#include <iostream>
int main() {
auto l = [](this auto self, int n) {
std::cout << n << " ";
return self;
};
l(1)(42)(100);
}
https://godbolt.org/z/3rEoGsPWe
Clang prints "1 42 100" as expected, however, GCC prints "1 1 42 1 42 100",
which is weird.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/113640] 'deducing this' lambda invoked multiple times unexpectedly
2024-01-28 15:51 [Bug c++/113640] New: 'deducing this' lambda invoked multiple times unexpectedly hewillk at gmail dot com
@ 2024-01-28 15:54 ` hewillk at gmail dot com
2024-01-30 15:10 ` ppalka at gcc dot gnu.org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: hewillk at gmail dot com @ 2024-01-28 15:54 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113640
--- Comment #1 from 康桓瑋 <hewillk at gmail dot com> ---
Noted that changing `this auto self` to `this auto&& self` will get the
expected results
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/113640] 'deducing this' lambda invoked multiple times unexpectedly
2024-01-28 15:51 [Bug c++/113640] New: 'deducing this' lambda invoked multiple times unexpectedly hewillk at gmail dot com
2024-01-28 15:54 ` [Bug c++/113640] " hewillk at gmail dot com
@ 2024-01-30 15:10 ` ppalka at gcc dot gnu.org
2024-01-30 15:45 ` cvs-commit at gcc dot gnu.org
2024-01-30 15:46 ` ppalka at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: ppalka at gcc dot gnu.org @ 2024-01-30 15:10 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113640
Patrick Palka <ppalka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |ppalka at gcc dot gnu.org
Last reconfirmed| |2024-01-30
Ever confirmed|0 |1
Status|UNCONFIRMED |ASSIGNED
CC| |ppalka at gcc dot gnu.org
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/113640] 'deducing this' lambda invoked multiple times unexpectedly
2024-01-28 15:51 [Bug c++/113640] New: 'deducing this' lambda invoked multiple times unexpectedly hewillk at gmail dot com
2024-01-28 15:54 ` [Bug c++/113640] " hewillk at gmail dot com
2024-01-30 15:10 ` ppalka at gcc dot gnu.org
@ 2024-01-30 15:45 ` cvs-commit at gcc dot gnu.org
2024-01-30 15:46 ` ppalka at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2024-01-30 15:45 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113640
--- Comment #2 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Patrick Palka <ppalka@gcc.gnu.org>:
https://gcc.gnu.org/g:0857a00fe3226db8801384743b6d44353dcac9da
commit r14-8631-g0857a00fe3226db8801384743b6d44353dcac9da
Author: Patrick Palka <ppalka@redhat.com>
Date: Tue Jan 30 10:44:56 2024 -0500
c++: duplicated side effects of xobj arg [PR113640]
We miscompile the below testcase because keep_unused_object_arg thinks
the object argument of an xobj member function is unused, and so it ends
up duplicating the argument's side effects.
PR c++/113640
gcc/cp/ChangeLog:
* call.cc (keep_unused_object_arg): Punt for an xobj member
function.
gcc/testsuite/ChangeLog:
* g++.dg/cpp23/explicit-obj-lambda14.C: New test.
Reviewed-by: Jason Merrill <jason@redhat.com>
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/113640] 'deducing this' lambda invoked multiple times unexpectedly
2024-01-28 15:51 [Bug c++/113640] New: 'deducing this' lambda invoked multiple times unexpectedly hewillk at gmail dot com
` (2 preceding siblings ...)
2024-01-30 15:45 ` cvs-commit at gcc dot gnu.org
@ 2024-01-30 15:46 ` ppalka at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: ppalka at gcc dot gnu.org @ 2024-01-30 15:46 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113640
Patrick Palka <ppalka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |14.0
Keywords| |wrong-code
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Fixed, thanks for the report.
^ permalink raw reply [flat|nested] 5+ messages in thread
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2024-01-28 15:51 [Bug c++/113640] New: 'deducing this' lambda invoked multiple times unexpectedly hewillk at gmail dot com
2024-01-28 15:54 ` [Bug c++/113640] " hewillk at gmail dot com
2024-01-30 15:10 ` ppalka at gcc dot gnu.org
2024-01-30 15:45 ` cvs-commit at gcc dot gnu.org
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