[Debian-ha-maintainers] Bug#877562: libqb FTCBFS: uses uncached AC_RUN_IFELSE

[Helmut Grohne]

On Wed, Oct 11, 2017 at 03:24:50PM +0200, Ferenc Wágner wrote:
> wferi at niif.hu (Ferenc Wágner) writes:
> 
> > The configure check was added for Hurd support.  Apparently, Hurd
> > defines _POSIX_MONOTONIC_CLOCK to 200809L, returns the same value for
> > a sysconf() query, but clock_getres (CLOCK_MONOTONIC, &ts) still fails
> > with EINVAL.

Oh, I was not aware of this issue. Thanks for pointing me to it.

> #hurd confirmed that this is a Hurd bug in glibc, and promised a fix it
> in the next upload.  So I guess an unconditional check for
> _POSIX_MONOTONIC_CLOCK being positive would be a good general solution.
> Do you agree?

I do agree that hurd should fix this. Yet, it may not be the thing to
rely on here. Testing for a working CLOCK_MONOTONIC is something that
many projects to. So a good thing to do here would be to make the check
cacheable (AC_CACHE_CHECK). Ideally, the check would move to
autoconf-archive or something for more projects to use. After some time
of glibc being fixed, my proposed conversion may make more sense.

Helmut