https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106384
Bug ID: 106384
Summary: -Wunused-variable is triggered for static const
type-deduced initializer lists
Product: gcc
Version: 12.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: martingalvan at sourceware dot org
Target Milestone: ---
It looks like -Wunused-variable is being triggered for global initializer
lists, even though they're declared as static const. This only seems to happen
if the list is declared using auto; if we explicitly write
std::initializer_list, the warning goes away.
For example, the following code triggers the warning:
#include <initializer_list>
static const auto list = {4, 2};
int main()
{
return 0;
}
whereas the following works fine:
#include <initializer_list>
static const std::initializer_list list = {4, 2};
int main()
{
return 0;
}
See also https://godbolt.org/z/evazo9zeM
IMHO auto shouldn't make any difference here; the warning shouldn't be
triggered as it doesn't imply -Wunused-const-variable for C++.
