https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52763
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |msebor at gcc dot gnu.org
--- Comment #8 from Martin Sebor <msebor at gcc dot gnu.org> ---
Clang warns when an enum object is compared to a constant that's out of the
most restricted range of the enum's type. The warning is in -Wall. It doesn't
warn when the object is compared to a constant that doesn't correspond to any
of the type's enumerators. I can see that being useful to some (carefully
written) projects but suspect it could be quite noisy for many others.
$ cat t.C && clang++ -S -Wall -Wextra t.C
enum E { NONE = 0, ONE = 1, TWO = 2 };
bool f (E e)
{
return e == 3; // no warning here
}
bool g (E e)
{
return e == 4;
}
t.C:10:12: warning: comparison of constant 4 with expression of type 'E' is
always false [-Wtautological-constant-out-of-range-compare]
return e == 4;
~ ^ ~
1 warning generated.
