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Re: clock_gettime and CLOCK_REALTIME

From: Paul Eggert
Subject: Re: clock_gettime and CLOCK_REALTIME
Date: Sun, 29 Jul 2018 11:48:00 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

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.

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