https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57170
TC <rs2740 at gmail dot com> changed:
What |Removed |Added
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CC| |rs2740 at gmail dot com
--- Comment #2 from TC <rs2740 at gmail dot com> ---
As comment #0 alluded to - perhaps a bit opaquely - this code is ill-formed in
C++11 and later. [stmt.switch] requires the case expression to be "a converted
constant expression ([expr.const]) of the promoted type of the switch
condition", and a narrowing conversion cannot be used in a converted constant
expression. The standard requires a diagnostic, which GCC fails to provide even
with -pedantic.
(Meanwhile, using unsigned char or unsigned short there is actually well-formed
if they get promoted to int as they usually do.)
So, unless you are saying that GCC's full conformance mode requires
-Wsign-conversion, I don't see how this bug is invalid.
