Re: [New module] Persistent Hash Array Mapped Tries (HAMTs)

[Bruno Haible]

Hi Marc,

> Is there a special Gnulib way (or Autoconf macro) for the following test:
> 
> #if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 201112L &&
> !defined (__STD_NO_ATOMICS__)
> 
> I am asking because there may be non-C11 compilers that nevertheless
> understand _Atomic.

And there may be C11 compilers which don't support _Atomic and nevertheless
dont't define __STD_NO_ATOMICS__.

So, indeed it would be useful to have an Autoconf macro that tests whether
_Atomic can be used.

AFAICS, neither Autoconf, nor Gnulib, nor the autoconf-archive project
have a test for this.

Bruno