Re: AC_LBL_FIXINCLUDES does not make it into configure

[Guy Harris via tcpdump-workers <tcpdump-workers () lists tcpdump org>]

> --- Begin Message ---
>
>
> From: Guy Harris <gharris () sonic net>
>
> Date: Wed, 18 Jan 2023 01:19:28 -0800
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> On Jan 18, 2023, at 1:07 AM, Denis Ovsienko <denis () ovsienko info> wrote:
>
> > Thank you for explaining the context Guy, it is very educational.
>
> A significant part of what's in autoconf, and a significant part of what's in at least some configure scripts, dates 
> back to old UN*Xes.
>
> ISO C and POSIX have, over time, rendered a lot of old-time tests unnecessary except for hobbyists and ancient "if it 
> ain't broke don't fix it" systems:
>
>         https://www.theregister.com/2001/04/12/missing_novell_server_discovered_after/
>
> (although that one was Netware rather than UN*X, there may be old UN*X versions running on old hardware still out 
> there).
>
> > Is AC_LBL_UNION_WAIT of a similar origin?
>
> Probably.
>
> >  Neither tcpdump nor libpcap use it.
>
> I think BSD's "union wait" has been supplanted by various POSIX-specified macros to pull apart an exit status stored in 
> an int, and, in the 3.4/0.4 timeframe, I don't think tcpdump or libpcap had any code to wait for a child process, and 
> thus didn't need AC_LBL_UNION_WAIT.
>
> --- End Message ---
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