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Re: sys/time.h and time.h

From: Zack Weinberg
Subject: Re: sys/time.h and time.h
Date: Sun, 28 Feb 2021 18:37:07 -0500

On Sun, Feb 28, 2021 at 5:44 PM Thien-Thi Nguyen <> wrote:
> My question is: To upgrade, which is preferred, (a) or (b)?
> (a)
>  # include <sys/time.h>
>  #else
>  # include <time.h>
>  #endif
> (b)
>  # include <sys/time.h>
>  #endif
>  #include <time.h>
> The difference is #include <time.h> is unconditional in (b),
> which is OK according to my reading of the warning message
> above.  (Thus, my guess is (b).)

Yes, (b) is what you should have, and a regular AC_CHECK_HEADERS for
sys/time.h. I'll happily take a patch to make this clearer in the
notes left by autoupdate and/or the manual.


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