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Re: Create and use first-versions.h with macros for function symbol versions
On Fri, 21 Apr 2017, Andreas Schwab wrote:
> On Apr 21 2017, Joseph Myers <joseph@codesourcery.com> wrote:
>
> > For example, if a platform with long double = double were to gain
> > distinct long double support now, the symbol versioning support for
> > lgamma might be more complicated.
>
> So what's the benefit if it cannot be generalized?
It can readily be made to cover the vast bulk of the cases where special
symbol version handling is needed for each libm function affected by a
change of long double format, leaving only a limited number of special
cases that may still need to do things manually.
An underlying objective is to have common macros meaning "set up all the
aliases and symbol versioning for this binary64 function" or "set up all
the aliases and symbol versioning for this binary128 function", so that
changing the definitions of those macros then accomplishes a large part of
adding TS 18661-3 *f64 / *f128 / *f32x / *f64x aliases. To achieve that
goal it doesn't need to cover every last function.
--
Joseph S. Myers
joseph@codesourcery.com