Arch Linux

Description:

Boost is unable to determine libstdc++ features when clang as a compiler is used.
Clang on arch uses libstdc++ as default stdlib. This results in a lack of enabled
boost-C++11-features.

The following boost ticket describes the issue:
https://svn.boost.org/trac/boost/ticket/7473
It has been stated that using clang / libstdc++ is an "unsupported configuration"
and that the configure script should be used to fix this.
http://www.boost.org/doc/libs/1_53_0/libs/config/doc/html/index.html#boost_config.configuring_boost_for_your_platform.using_the_configure_script

AFAIK the versions of gcc and clang shipped by arch support all the
nice libstdc++ features, so it seems reasonable to enable them via the
configure.

It is frustrating for me as a user to see that I have all the nice
latest versions and yet they don't work with each other. It's clearly
not arch's fault, but it would be great if distribution, library and
compiler developers could communicate to solve this.

Additional info:
* boost-1.53.0-2


Steps to reproduce:

compile the following code:

#include <array>
#include <boost/functional/hash.hpp>

size_t foo(std::array<int, 2> bar) {
return boost::hash_value(bar);
}

g++ -c -std=c++11 (works)
clang++ -c -std=c++11 (fails)
clang++ -c -std=c++11 -D__GNUC_MINOR__=8 (evil workaround)