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

[Ferenc Wágner]

Helmut Grohne <helmut at subdivi.de> writes:

> libqb fails to cross build from source, because it uses an uncached
> AC_RUN_IFELSE for determining whether CLOCK_MONOTONIC works. That check
> is flawed in that availability of CLOCK_MONOTONIC is a runtime property
> and may change from system to system.

Hi,

Thanks for the report!  Unfortunately, I'm somewhat lost with this
issue.  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.  According to my reading of the documentation, this
should not happen.

> The attached patch makes it check whether CLOCK_MONOTONIC is declared
> and only then try whether it works. In case of cross compilation,
> CLOCK_MONOTONIC is assumed to work if available, which seems like a
> reasonable guess to me.

Unfortunately that's not the case with Hurd.

> After applying the patch, libqb cross builds successfully. Can you
> take it?

I think it wouldn't create a working binary when cross-compiled to Hurd.
That's certainly an improvement, but I'd prefer something better...
-- 
Regards,
Feri