Create and use first-versions.h with macros for function symbol versions

[Andreas Schwab]

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?

Andreas.

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Andreas Schwab, schwab@linux-m68k.org
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