Can't compile Chrono on HP-UX due to no CLOCK_REALTIME macro.

[konrad.zemek@…]

We're trying to compile Chrono library on HP-UX 11i23, to be used with conjunction with threads. The compilation fails with

#error <time.h> does not supply CLOCK_REALTIME

This is due to the following code in system_clocks.hpp:

# if defined( BOOST_CHRONO_POSIX_API )
#   if ! defined(CLOCK_REALTIME)
#     error <time.h> does not supply CLOCK_REALTIME
#   endif
# endif

HP-UX provides CLOCK_REALTIME, although as an enum, not a macro, so the ifdef fails. This is true for version 11i23 and I suspect that also for other HP-UX versions (I cannot confirm this though, and it's hard to get any information on HP-UX through googling).

I'm not sure what solution would be right here, but simple ifdef does not cut it. I sidestepped this issue by modyfying it to

#   if ! defined(CLOCK_REALTIME) || defined(__hpux)

but it's more of a hack than a solution, especially since I'm not certain that every version of HP-UX supply CLOCK_REALTIME.

[anonymous]

Of course didn't mean for the code to fail on all HP-UXes. :) This is the actual hack code:

#   if ! defined(CLOCK_REALTIME) && ! defined(__hpux)

[viboes]

Committed revision [83896][83899].

[viboes]

(In [83905]) Chrono: merge to fix #8435.