https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105208
Bug ID: 105208
Summary: incorrect -Wunused-but-set-variable for static const
variables used in const expressions
Product: gcc
Version: 11.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: muecker at gwdg dot de
Target Milestone: ---
In the following example, which uses an (undocumented?) extension
that allows using 'y' where a const expression is required,
there is then an incorrect warning:
void test(void)
{
static const int y = 2;
enum { A = y };
}
<source>:4:22: warning: variable 'y' set but not used
[-Wunused-but-set-variable]
https://godbolt.org/z/7Y7KE5v59
Clang supports this too but does not warn.
