Re: A small note on the portability of cmake

Hi,

On 2019-01-19 23:39:37 -0800, Jesse Zhang wrote:
> On Sat, Jan 19, 2019 at 8:50 AM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> >
> > Failed miserably. It turns out cmake has a hard dependency on libuv
> > which (a) has a hard dependency on atomic ops and (b) according to its
> > own docs, doesn't really care about any platforms other than
> > Linux/macOS/Windows and maybe FreeBSD.>
>
> I beg to disagree with point b above: the libuv project continually
> receives (and accepts) patches fixing bugs specifically for OpenBSD.
> Atomic ops (compare-and-exchange) might be a harder dependency to shed
> for libuv. Does the fallback onto compiler intrinsics
> (__sync_val_compare_and_swap, or on GCC 4.7+,
> __atomic_compare_exchange_n) not work here?

HPPA doesn't hardware instructions for atomic ops other than
test-and-set IIRC.

Greetings,

Andres Freund