From owner-freebsd-current@freebsd.org  Tue Mar 29 13:53:49 2016
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Date: Tue, 29 Mar 2016 16:53:18 +0300
From: Aleksander Alekseev <mail@eax.me>
To: Dimitry Andric <dim@FreeBSD.org>
Cc: Gary Jennejohn <gljennjohn@gmail.com>, Michael Gmelin <freebsd@grem.de>,
 freebsd-current@freebsd.org
Subject: Re: Need some help with ports and rebuilding the world
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> For some reason, your build does not pick up the __alloc_size defines
> from sys/cdefs.h.  You will have to figure out which cdefs.h your
> build is including, and check whether that is in sync with the rest
> of your source tree.

I removed CC, CXX and CPP lines from /etc/make.conf and it solved a
problem. Still it's weird since cc (used now) and clang (explicitly
specified before) supposed to be the same compiler:

$ clang --version
FreeBSD clang version 3.4.1 (tags/RELEASE_34/dot1-final 208032) 20140512
Target: x86_64-unknown-freebsd10.2
Thread model: posix

$ cc --version
FreeBSD clang version 3.4.1 (tags/RELEASE_34/dot1-final 208032) 20140512
Target: x86_64-unknown-freebsd10.2
Thread model: posix

In fact cc and clang look like a hardlink to the same file. Any ideas
why one is capable of building the world and second is not?

-- 
Best regards,
Aleksander Alekseev
http://eax.me/