another effc++ spurious warning?

[Gabriel Dos Reis]

You Wrote Giovanni Bajo
> Nathan Myers wrote:
>
>> We already have a feature to prevent warnings originating from system
>> headers.  Why does it fail in this case?
>
> It doesn't fail. The error comes from v3 compilation with
> CXXFLAGS="-Weffc++".

Yes, but -Weffc++ is not -Wsystem-headers.  So, unless
-Wsystem-headers is specified, we should not have had
a warning from the compiler for instantiations that come
from our headers.

That is a failure.

-- Gaby