Re: [PATCH], PowerPC long double transistion, patch #1

[Joseph Myers <joseph at codesourcery dot com>]

On Tue, 19 Jun 2018, Segher Boessenkool wrote:

> > Because the names depend on the format not the type, there is no risk of 
> > ABI inconsistency from linking with a libgcc function for the wrong 
> > format, and so I think the linker warning is never relevant for linking 
> > with libgcc (and once the glibc support is in, it won't be relevant for 
> > linking with glibc either).  Linker warnings are relevant for the generic 
> > case of a library that *doesn't* do anything special to support both 
> > formats simultaneously - not for a library that properly handles getting 
> > things right for both formats automatically.
> 
> Yes.  And as far as I see the same is true for *all* libgcc functions
> (not only long double), so we can just as well turn off the gnu_attributes
> warning for all of libgcc.

Yes.  libgcc and (future) glibc don't need that warning.

(As I noted in <https://gcc.gnu.org/ml/gcc-patches/2018-06/msg01092.html> 
there *is* currently a bug where some *tf* and *tc* functions get built 
with the wrong ABI if you change the default long double format.)

-- 
Joseph S. Myers
joseph@codesourcery.com