Re: _GL_EXTERN_INLINE not defined correctly in config.h for macOS

[Bruno Haible]

Hi Reuben,

> The definition of _GL_EXTERN_INLINE relies, on macOS, on
> __header_inline, which is not a compiler built-in, but is defined in
> sys/cdefs.h. Therefore, __header_inline is not defined when config.h
> is included, and the tests always assume, on macOS, that the compiler
> is buggy and does not support "extern inline".

Please, to help us reproduce the issue and verify a potential fix:
How to reproduce the issue? I.e. What did you try to do, and what were
the resulting diagnostics?

Bruno