https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96311
Bug ID: 96311
Summary: false positive for -Wunused-but-set-variable
(const/constexpr identifier used in generic lambda)
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: tilkax at gmail dot com
Target Milestone: ---
Using gcc version 11.0.0 20200723, this code:
void foo()
{
constexpr int used = 0;
[](auto unused)
{
return used;
};
}
triggers an incorrect warning:
<source>:3:19: warning: variable 'used' set but not used
[-Wunused-but-set-variable]
3 | constexpr int used = 0;
| ^~~~
It doesn't matter whether the lambda is called but it does need to be a generic
lambda to trigger the incorrect warning.
Also, both the lambda parameter as well as the lambda itself are unused here
but don't trigger any warnings :/
