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Re: help making a cmake check for _Atomic?
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From: Cristian Rodríguez via curl-library <curl-library_at_lists.haxx.se>
Date: Sun, 12 Jun 2022 18:47:46 -0400
so, if target environment is said to support c11 and not defined
__STDC_NO_ATOMICS__ then include header, define some internal flag
else not supported.
On Sun, Jun 12, 2022 at 6:39 PM Cristian Rodríguez
<crrodriguez_at_opensuse.org> wrote:
>
> On Sun, Jun 12, 2022 at 6:18 PM Daniel Stenberg <daniel_at_haxx.se> wrote:
> >
> > On Sun, 12 Jun 2022, Cristian Rodríguez wrote:
> >
> > > That does not appear to be the right way..
> > >
> > > __STDC_NO_ATOMICS__ means _Atomic is *not* implemented .
> > >
> > > it is not a library feature.
> >
> > I don't understand this remark. We don't check for __STDC_NO_ATOMICS__ at
> > all?
>
>
> In the referenced PR there is no check on __STDC_NO_ATOMICS__ which is
> actually the only thing that matters. _Atomic need implementation
> defined compiler support.
>
> http://port70.net/~nsz/c/c11/n1570.html#7.17
Date: Sun, 12 Jun 2022 18:47:46 -0400
so, if target environment is said to support c11 and not defined
__STDC_NO_ATOMICS__ then include header, define some internal flag
else not supported.
On Sun, Jun 12, 2022 at 6:39 PM Cristian Rodríguez
<crrodriguez_at_opensuse.org> wrote:
>
> On Sun, Jun 12, 2022 at 6:18 PM Daniel Stenberg <daniel_at_haxx.se> wrote:
> >
> > On Sun, 12 Jun 2022, Cristian Rodríguez wrote:
> >
> > > That does not appear to be the right way..
> > >
> > > __STDC_NO_ATOMICS__ means _Atomic is *not* implemented .
> > >
> > > it is not a library feature.
> >
> > I don't understand this remark. We don't check for __STDC_NO_ATOMICS__ at
> > all?
>
>
> In the referenced PR there is no check on __STDC_NO_ATOMICS__ which is
> actually the only thing that matters. _Atomic need implementation
> defined compiler support.
>
> http://port70.net/~nsz/c/c11/n1570.html#7.17
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