https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69670
Bug ID: 69670
Summary: Useless -Wenum-compare when comparing parallel enums
in static_assert
Product: gcc
Version: 5.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: wipedout at yandex dot ru
Target Milestone: ---
I'm trying this on http://gcc.godbolt.org/ the version is "x86 gcc 5.3.0", the
options line is "-O3 -Wall -std=c++11" The code is as follows:
enum One {
One_Magic
};
enum Two {
Two_Magic
};
void test()
{
static_assert( One_Magic == Two_Magic, "");
}
I get "warning: comparison between 'enum One' and 'enum Two' [-Wenum-compare]"
which is completely useless. The intent is to check that two parallel enum
elements have identical values. If they have identical values - the user is
happy, no problem. If they don't have identical values then static_assert fails
and this is impossible to ignore.
Same goes for pre-c++11 implementations of "static assert" (one is with an
array typedef and the other is with a template and a specialization thereof).
