Re: [PATCH] Fix OAuth feature detection on OpenBSD+Meson - Mailing list pgsql-hackers

On 24.06.25 22:39, Jacob Champion wrote:
> On Tue, Jun 24, 2025 at 1:29 PM Peter Eisentraut <peter@eisentraut.org> wrote:
>> Note that Autoconf uses a compilation test, not a preprocessor test, for
>> its AC_CHECK_HEADERS, so it uses .check_header() semantics.  And this
>> was the result of a long transition, because the compile test was
>> ultimately deemed to be better.  So in general, I would be wary about
>> moving away from .check_header() toward .has_header().  But it looks
>> like meson.build mixes those without much of a pattern, so maybe it
>> doesn't matter for now.
> 
> I don't mind moving in that direction, but I do want the two sides to
> match. So if it was good enough up to this point to use has_header()
> for our feature macros, I don't think I want to try to change that for
> 18.

right

>> But I'm also suspicious, because by this explanation, the
>> AC_CHECK_HEADERS calls on sys/event.h should fail on OpenBSD, but they
>> do not on the existing buildfarm members.
> 
> I think Andres tracked that discrepancy down [1]:
> 
>> Gah, configure does pass - because AC_CHECK_HEADER(), if includes is not passed
>> in, first includes what's defined in AC_INCLUDES_DEFAULT.

Ah, that explains it.