https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77419
Bug ID: 77419
Summary: Unconsistent behavior with references& and
__attribute__((unused))
Product: gcc
Version: 6.1.1
Status: UNCONFIRMED
Severity: minor
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: tobias.leibner at googlemail dot com
Target Milestone: ---
The following code
int main() {
int __attribute__((unused)) int_var_unused = 42;
int int_var = 42;
int& __attribute__((unused)) int_ref = int_var;
auto __attribute__((unused)) auto_var_unused = 42;
auto auto_var = 42;
auto& __attribute__((unused)) auto_ref = auto_var;
return 0;
}
produces an unused variable warning for auto_ref when compiled with g++
-std=c++11 -Wall, but not for the other variables.
I just learned that __attribute__((unused)) is intended to be placed after the
variable name, in that case the warning is suppressed as expected. So I am not
sure whether this is expected behavior, but it seems to work for everything
that is not an auto& variable and also works in clang.
