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* [Bug c++/107019] New: -Wunused-but-set-variable false positive for static variable in lambda with boost
@ 2022-09-23 15:03 mario at klebsch dot de
2022-09-23 15:10 ` [Bug c++/107019] " mario at klebsch dot de
2022-09-23 16:18 ` pinskia at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: mario at klebsch dot de @ 2022-09-23 15:03 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107019
Bug ID: 107019
Summary: -Wunused-but-set-variable false positive for static
variable in lambda with boost
Product: gcc
Version: 11.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: mario at klebsch dot de
Target Milestone: ---
I get a palse positive from -Wunused-but-set-variable with this little sample:
#include <stdio.h>
#include <boost/asio.hpp>
int main(int argc, char *argv[])
{
static const char *func = __FUNCTION__;
boost::asio::io_service io_service;
boost::asio::deadline_timer timer(io_service);
timer.async_wait( [](auto) {
printf("%s()\n", func);
});
}
~/tmp $ g++ -Wall bug2.cpp -c -I boost_1_80_0/
bug2.cpp: In function ‘int main(int, char**)’:
bug2.cpp:7:28: warning: variable ‘func’ set but not used
[-Wunused-but-set-variable]
7 | static const char *func = __FUNCTION__;
| ^~~~
~/tmp $
If I do not call timer.async_wait() but some other function taking const
std::function<void(const boost::system::error_code&)>& as parameter, the usage
of func in the lambda is recognized correctly.
73, Mario
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/107019] -Wunused-but-set-variable false positive for static variable in lambda with boost
2022-09-23 15:03 [Bug c++/107019] New: -Wunused-but-set-variable false positive for static variable in lambda with boost mario at klebsch dot de
@ 2022-09-23 15:10 ` mario at klebsch dot de
2022-09-23 16:18 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: mario at klebsch dot de @ 2022-09-23 15:10 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107019
Mario Klebsch <mario at klebsch dot de> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mario at klebsch dot de
--- Comment #1 from Mario Klebsch <mario at klebsch dot de> ---
Created attachment 53619
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53619&action=edit
Sample demonstrating the bug
Needs boost-1.80.0
compile with g++ -Wall -c -I boost_1_80_0 bug2.cpp
> ~/tmp $ g++ -Wall -c -I boost_1_80_0 bug2.cpp
> bug2.cpp: In function ‘int main(int, char**)’:
> bug2.cpp:17:28: warning: variable ‘func’ set but not used [-Wunused-but-set-variable]
> 17 | static const char *func = __FUNCTION__;
> | ^~~~
> ~/tmp $
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/107019] -Wunused-but-set-variable false positive for static variable in lambda with boost
2022-09-23 15:03 [Bug c++/107019] New: -Wunused-but-set-variable false positive for static variable in lambda with boost mario at klebsch dot de
2022-09-23 15:10 ` [Bug c++/107019] " mario at klebsch dot de
@ 2022-09-23 16:18 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-09-23 16:18 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107019
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |DUPLICATE
Status|UNCONFIRMED |RESOLVED
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Dup of bug 88804.
*** This bug has been marked as a duplicate of bug 88804 ***
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2022-09-23 16:18 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2022-09-23 15:03 [Bug c++/107019] New: -Wunused-but-set-variable false positive for static variable in lambda with boost mario at klebsch dot de
2022-09-23 15:10 ` [Bug c++/107019] " mario at klebsch dot de
2022-09-23 16:18 ` pinskia at gcc dot gnu.org
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