Re: [PATCH] In _IEEE_LIBM mode, use weak symbols instead of wrapper funcs [v3]

[Craig Howland <howland at LGSInnovations dot com>]

On 09/21/2018 04:29 PM, Keith Packard wrote:
> Craig Howland <howland@LGSInnovations.com> writes:
>
> > I don't see anything which makes the definition of __strong_reference dependent
> > upon target.  In sys/cdefs.h it is only dependent upon __GNUC__.
> Which makes sense -- there shouldn't be any platform which cannot
> support these strong references; they're just a duplicate symbol
> with the same value and properties. However, it does depend on __GNUC__,
> and one can imagine someone using a compiler other than gcc?
It's no difference than a weak alias--it requires object file support.  To quote 
from the GCC manual about a function alias attribute (which is what the macro 
ends up using), "This attribute requires assembler and object file support, and 
may not be available on all targets."