--- Begin Message ---On Jan 18, 2023, at 1:07 AM, Denis Ovsienko <de...@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.
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