CPPFLAGS in C-only context

[Denis Ovsienko via tcpdump-workers <tcpdump-workers () lists tcpdump org>]

> --- Begin Message ---
>
>
> From: Denis Ovsienko <denis () ovsienko info>
>
> Date: Mon, 23 Jan 2023 22:16:24 +0000
>
> Hello all.
>
> There is one other thing in Autoconf files of tcpslice and tcpdump that
> jumped out at me:
>
> savedcppflags="$CPPFLAGS"
> CPPFLAGS="$CPPFLAGS $V_INCLS"
> AC_CHECK_HEADERS(pcap/pcap-inttypes.h)
> AC_CHECK_FUNCS(pcap_lib_version)
> CPPFLAGS="$savedcppflags"
>
> It looks like either in a C project context CPPFLAGS works in a
> non-obvious way, or is a no-op.
>
> -- 
>     Denis Ovsienko
>
> --- End Message ---
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