[cfe-dev] How to add a -W flag?

[Zach Davis]

I believe you need to add your warning to a group like so:

  def warn_need_module_import : Warning<
    "Use of identifier '%0' requires import/inclusion of the module '%1'">;

becomes -->

  def warn_need_module_import : Warning<
    "Use of identifier '%0' requires import/inclusion of the module '%1'">,
    InGroup<SomeGroup>;

where "SomeGroup" is taken from DiagnosticGroups.td .

You can add you own group as well, the format is like:

  def SomeGroup : DiagGroup<"some-group">;

and then you should be able to use -Wsome-group




On Fri, Jan 31, 2014 at 1:29 PM, Thompson, John <
John_Thompson at playstation.sony.com> wrote:

>  I'm adding a warning to the end of the "Modules Issues" category in
> DiagnosticSemaKinds.td:
>
>
>
> def warn_need_module_import : Warning<
>
>   "Use of identifier '%0' requires import/inclusion of the module '%1'">;
>
>
>
> This makes test/Misc/warning-flags.c fail.
>
>
>
> A comment in that test file says:
>
>
>
>     If you add a new warning without a flag, this test will fail.  To fix
>
>     this test, simply add a warning group to that warning.
>
>
>
> I don't know what that means.  How do I add a warning group to the warning?
>
>
>
> Thanks.
>
>
>
> -John
>
>
>
>
>
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