compiler warnings on AIX and Solaris

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

--- Begin Message --- From: Denis Ovsienko <denis () ovsienko info>
Date: Sat, 24 Jul 2021 00:11:27 +0100

Hello list.

As it turns out, on Solaris 9 it is impossible to compile current
tcpdump with CFLAGS=-Werror because missing/getopt_long.c yields a few
warnings (attached). As far as the current revisions of this file go in
FreeBSD, NetBSD and OpenBSD, FreeBSD seems to be the closest and just a
bit newer than the current tcpdump copy (OpenBSD revision 1.22 -> 1.26).
However, it seems unlikely that porting the newer revision would make
the warnings go away, because, for example, permute_args() has not
changed at all.

The same problem stands on AIX 7, and in addition there is an issue
specific to XL C compiler, in that ./configure detects that the
compiler does not support -W, but then proceeds to flex every -Wxxxx
option anyway, which the compiler treats as a soft error, so ./configure
takes each option as supported, so at the compile time every -Wxxxx
option ends up in CFLAGS, so for every .c file xlc yields 15 warnings
(see attached). It works, but looks messy.

So for now the build matrix scripts do not specify -Werror for these
two cases. There are more related corner cases of varying severity,
some of which I might have time to describe later.

Cheers.

-- 
    Denis Ovsienko

Attachment: warnings_solaris9.txt
Description:

Attachment: warnings_aix7.txt
Description:

--- End Message ---

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