[cfe-commits] Add -Wno-extension-used to filter ext_token_used

Ivan Krasin krasin at google.com
Tue Oct 4 15:32:31 PDT 2011

On Tue, Oct 4, 2011 at 3:24 PM, Eli Friedman <eli.friedman at gmail.com> wrote:

> On Tue, Oct 4, 2011 at 11:13 AM, Ivan Krasin <krasin at chromium.org> wrote:
> > Hi llvm team!
> >
> > This patch adds support of -Wno-extension-used to make it possible to
> > suppress the warning:
> >
> > lala.c:1:21: warning: extension used [-pedantic]
> > double lala(double) asm("llvm.log.f64");
> >
> > r140770 has started to promote this warning to error if -Werror is
> > specified (which is absolutely correct).
> > We have a test that checks some llvm intrinsics and it's not Clangy to
> > drop -Werror just because one particular warning is expected.
> > I have added the option to suppress this warning and has removed it
> > from the test for warnings w/o suppression options.
> >
> > OK to commit?
> We really ought to clarify what exactly this is warning about and name
> the warning group in a more intuitive way.  -Wno-extension-used
> doesn't give the user any idea what warning it is actually
> suppressing.  I'm drawing a blank as to what exactly to call it,
> though.
Hi Eli,

It suppresses any language extension used in the program source. I have no
preference on how the flag should be named and I have chosen
"extension-used" just to fit to the existing warning message:
 "warning: extension used [-pedantic]"

Probably, a better name would be language-extension or
language-extension-used. In this case -Wno-language-extension would give a
good idea of what warning does it suppress.
Are you fine with any of the options above? Do you have a better idea?

> -Eli
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