Re: clock_gettime and CLOCK_REALTIME

[Paul Eggert]

Eli Zaretskii wrote:
> Does Posix mandate that CLOCK_REALTIME be a macro?

Yes, the POSIX spec for <time.h> requires CLOCK_REALTIME to be a symbolic 
constant, and it says that a symbolic constant must be a macro that expands to a 
compile-time constant expression with an integer type (it need not be usable in 
#if).

> Why does Gnulib's gettime.c insist on CLOCK_REALTIME being a macro?

Evidently nobody has cared about this before, as there is a fallback that should 
work well enough.

I suspect the best place to fix this is mingw, as there should be an easy fix 
there. It'd be a nice also to scan mingw headers for other places that don't 
define macros as they should.