devel/boost issues regarding boost/chrono/duration.hpp constexpr definitions with clang

[Dimitry Andric]

On 11 Dec 2013, at 13:22, Gergely CZUCZY <gergely.czuczy at harmless.hu> wrote:
> Could you please update boost to 1.55? There's seems to be some issues
> with the current version, which might be fixed later.
> 
> Namely, on a 9.x default install, built with defaults (gcc as defcc),
> when one is trying to include boost/thread/shared_mutex.hpp and build
> that file with clang:
> 
> --- BEGIN boostmtx.cc ---
> #include <boost/thread/shared_mutex.hpp>
> 
> int main() { return 0; }
> --- END boostmtx.cc ---
> 
> And when trying to build it:
> $ CXXFLAGS="-Werror -pedantic -std=c++11 -I/usr/local/include" CXX=clang++ make boostmtx
> clang++ -Werror -pedantic -std=c++11 -I/usr/local/include  boostmtx.cc  -o boostmtx
> In file included from boostmtx.cc:1:
> In file included from /usr/local/include/boost/thread/shared_mutex.hpp:21:
> In file included from /usr/local/include/boost/thread/pthread/shared_mutex.hpp:13:
> In file included from /usr/local/include/boost/thread/mutex.hpp:16:
> In file included from /usr/local/include/boost/thread/pthread/mutex.hpp:12:
> In file included from /usr/local/include/boost/thread/locks.hpp:18:
> In file included from /usr/local/include/boost/chrono/time_point.hpp:33:
> /usr/local/include/boost/chrono/duration.hpp:667:28: error: 'constexpr' non-static member function will not be implicitly 'const' in
>      C++1y; add 'const' to avoid a change in behavior [-Werror,-Wconstexpr-not-const]
>      BOOST_CONSTEXPR bool operator()(const LhsDuration& lhs, const RhsDuration& rhs)
>                           ^
>                                                                                      const

Have a look at http://svnweb.freebsd.org/changeset/base/251066 for a fix.

Basically, just make the operator() functions themselves const.

-Dimitry

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