https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82799
Bug ID: 82799
Summary: [8 Regression] -Wunused-but-set-variable false
positive
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: sgunderson at bigfoot dot com
Target Milestone: ---
Hi,
Reduced testcase (automatically; it might be possible to reduce further):
enum a { b };
struct c {
template < a > int d() {
const bool is_ident = 0;
const int ret = is_ident ? 7 : 9;
return ret;
}
void e() {
d < b > ();
}
};
When compiled with -Wall, yields:
test.cc: In instantiation of 'int c::d() [with a <anonymous> = (a)0]':
test.cc:9:12: required from here
test.cc:4:14: warning: variable 'is_ident' set but not used
[-Wunused-but-set-variable]
const bool is_ident = 0;
^~~~~~~~
even though is_ident is clearly used on the line below.
gcc version 8.0.0 20171017 (experimental) [trunk revision 253812] (Debian
20171017-1)
This does not happen with GCC 7.2.1.
