[Bug target/126581] [16/17 Regression] -mavx10.2 no longer works by r16-9456-gca889982b6f259

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126581

--- Comment #11 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Hongtao Liu from comment #10)
> (In reply to H.J. Lu from comment #9)
> > > I think the aliases should be controlled by a macro.  For GCC 16, they
> > > should be enabled by default.
> > 
> > Something like
> > 
> > #ifndef __AVX10_2_COMPATIBLE_INTRINSICS__
> > #define __AVX10_2_COMPATIBLE_INTRINSICS__ 0/1
> > #endif
> > 
> > #if __AVX10_2_COMPATIBLE_INTRINSICS__
> > # define compatible aliases
> > #endif
> 
> I prefer just add the alias version for 16.x and 15.x, not for trunk and no
> macro for the control of those aliases.

Then we should add a warning to 16.x and 15.x to warn the usages of these
aliases as well as add an option to 16.x and 15.x to disable these aliases
so that developers can prepare these projects for GCC 17.