Re: [patch, c++] Add a warning flag for the enum bit-field declaration warning in bug #61414.

["Sam van Kampen via gcc-patches" <gcc-patches at gcc dot gnu dot org>]

On Mon, Oct 16, 2017 at 11:31:10PM +0000, Joseph Myers wrote:
> On Mon, 16 Oct 2017, Sam van Kampen via gcc-patches wrote:
> 
> > +Wbitfield-enum-conversion
> > +C++ Var(warn_bitfield_enum_conversion) Init(1) Warning
> > +Warn about struct bit-fields being too small to hold enumerated types.
> 
> Any option supported for C++ should also be supported for ObjC++ unless 
> there is a clear reason it cannot work for ObjC++.
> [...]
> The documentation of the option also needs to indicate that it's for 
> C++/ObjC++ only, similar to other such options.
I've added the ObjC++ flag to the warning declaration above and I've
expanded the documentation to note that it only applies to C++/ObjC++.

> The patch also needs to add a testcase to the testsuite that verifies the 
> warnings issues in appropriate cases (and that warnings are not issued 
> when the bit-field is large enough).
I've added such a testcase as well. I'll send the updated version of the
patch, I'm just waiting to hear back from Martin on whether the flag
should fall under -Wextra or fall under no flag and be disabled unless
explicitly specified.
> -- 
> Joseph S. Myers
> joseph@codesourcery.com

Thanks for the feedback,
Sam