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Date: Thu, 4 Sep 2014 13:01:34 +0000 (UTC)
From: Marcin Cieslak <saper@saper.info>
To: freebsd-toolchain@FreeBSD.org
Subject: error: empty struct has size 0 in C, size 1 in C++
 [-Werror,-Wc++-compat]
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In my clang 3.3 FreeBSD -CURRENT (r259613 as of Dec 2013)
I used to have CFLAGS+=-Wc++-compat in my /etc/make.conf 
probably from some older guide to enable CTF and DTrace.

During an upgrade to today's r271089, with this flag (and -Werror)
the "make toolchain" command fails on the empty structures,
for example struct pthread{} in lib/libc/gen/_pthread_stubs.c

Not sure this is a real problem, rather a heads-up
to those who did not clean up their make.conf regularly.

I don't think I've had this problem with clang 3.3

Old (r271089) clang is:

$ clang --version
FreeBSD clang version 3.3 (tags/RELEASE_33/final 183502) 20130610
Target: x86_64-unknown-freebsd11.0
Thread model: posix

New (being built):

$ /usr/obj/usr/src/tmp/usr/bin/clang --version
FreeBSD clang version 3.4.1 (tags/RELEASE_34/dot1-final 208032) 20140512
Target: x86_64-unknown-freebsd11.0
Thread model: posix


//Marcin