CXXSTD=c++11

[Dimitry Andric]

On 24 Mar 2016, at 23:54, Dimitry Andric <dim at FreeBSD.org> wrote:
> 
> On 24 Mar 2016, at 23:51, Bryan Drewery <bdrewery at FreeBSD.org> wrote:
...
>> It fails without -std=c++11 (there's more discussion in that link and in
>> PR 205453).
> 
> Yeah, I also commented on PR 205453 in the past, but I still don't
> understand where the external gcc gets its _Static_assert macro from.
> Or whether it gets it at all.  Maybe we should place a hack for this in
> sys/cdefs.h?  We shouldn't litter contrib code with #ifdef GCC_VERSION
> blocks.

Hm, hacking around in cdefs.h also doesn't really help, because gcc
refuses to recognize either _Static_assert or static_assert when it's
not in C++11 mode.  Reading back https://reviews.freebsd.org/D1390, I
see that I originally wanted to avoid building libcxxrt with -std=c++11.
This was so you could even build it with gcc 4.2.1 from base.

However, it really doesn't make much sense to do so, and upstream
libcxxrt simply uses static_assert directly, and requires -std=c++11.  I
will update the libcxxrt build to do so, probably tomorrow.

-Dimitry

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