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Date: Tue, 11 Oct 2016 12:46:44 -0400
From: Rich Felker <>
Subject: Re: Using macro CMSG_NXTHDR generates warnings with CLANG

On Tue, Oct 11, 2016 at 06:43:21PM +0200, Szabolcs Nagy wrote:
> * Jan Vorlicek <> [2016-10-11 15:38:38 +0000]:
> > My test was a c++ code :-). That's why the struct was not there.
> > 
> don't top post.
> including sys/socket.h (or any posix header) in c++ code is undefined
> (neither iso c++ nor posix defines the behaviour) so you are on your own.

C++ isn't the issue here. The header is obviously expected to work in
C++, even though there's no formal spec for it (although of course you
should have extern "C" around it). The issue at hand is the clang
warnings and I think they happen just the same in equivalent C code.


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