Re: [PATCH] time.h: include header before using time_t

[James Carlson <carlsonj@workingcode.com>]

On 10/04/19 14:33, Kurt Van Dijck wrote:
> On vr, 04 okt 2019 13:52:11 -0400, James Carlson wrote:
> headers under sys/ are, AFAIK, not delivered by the kernel, but by the
> toolchain. sys/time.h may have less issues than time.h, it has the same
> disease.

I've never heard of this problem.  I'm afraid I don't know what you're
referring to.

I've never heard of a compiler (or other tool chain component) that
delivers files to /usr/include/sys.  That'd be somewhat surprising to
me, but I guess it's a wide world out there.

As the name says, the stuff under sys/ is part of the _system_.  On
UNIX, the standard parts of it are described in the Single UNIX
Standard, maintained by The Open Group.  That's the documentation
pointer I provided previously.

Are there systems where system header files aren't installed by default?
 Sure.  That's somewhat commonplace.  But on such a machine you can't
compile things (including pppd) until you install the (presumably
optional) header files.

If you look closely, you'll see that pppd/main.c already includes
<sys/time.h> and it's not guarded by any conditional compilation because
it's a *STANDARD HEADER FILE*.  If there were problems of some sort with
this include file, I'd expect they'd have surfaced by now.

-- 
James Carlson         42.703N 71.076W         <carlsonj@workingcode.com>