Le 05/01/13 18:37, Marshall Clow a écrit :
On Jan 4, 2013, at 11:25 AM, Marshall Clow <mclow.lists@gmail.com> wrote:
Updated release candidate files for 1.53.0 beta 1 are available at http://boost.cowic.de/rc/
As always, the release managers would appreciate it if you download the candidate of your choice and give building it a try. Please report both success and failure, and anything else that is noteworthy. I built the RC on Mac OS X with both clang and gcc w/o errors. However, when I built using clang and libc++ in C++11 mode, I found two problems:
./b2 toolset=clang cxxflags="-std=c++11 -stdlib=libc++ -Wno-unused-variable" linkflags="-stdlib=libc++"
Issue #1:
clang-darwin.compile.c++ bin.v2/libs/chrono/build/clang-darwin-11/release/threading-multi/chrono.o In file included from libs/chrono/src/chrono.cpp:14: In file included from ./boost/chrono/detail/inlined/chrono.hpp:13: In file included from ./boost/chrono/chrono.hpp:11: ./boost/chrono/duration.hpp:353:49: error: constexpr function never produces a constant expression static BOOST_CHRONO_LIB_CONSTEXPR float lowest() BOOST_CHRONO_LIB_NOEXCEPT_OR_THROW ^ ./boost/chrono/duration.hpp:355:21: note: non-constexpr function 'max' cannot be used in a constant expression return -(std::numeric_limits<float>::max) (); ^ /usr/bin/../lib/c++/v1/limits:443:43: note: declared here _LIBCPP_INLINE_VISIBILITY static type max() _NOEXCEPT {return __base::max();} ^ This is a bug in libc++; std::numeric_limits<>::max() is not marked as constexpr. This has been fixed in the libc++ trunk, and should appear in the next clang/libc++ release. Hi, I defined BOOST_CHRONO_LIB_CONSTEXPR as follows to avoid this problem.
#if defined( BOOST_NO_CXX11_NUMERIC_LIMITS ) #define BOOST_CHRONO_LIB_CONSTEXPR #else #define BOOST_CHRONO_LIB_CONSTEXPR BOOST_CONSTEXPR #endif Shouldn't BOOST_NO_CXX11_NUMERIC_LIMITS be defined as it doesn't providesa C++11 implementation, or should Boost.Chrono take in account the missing feature of libc++ individually? BTW, which version of libc++ are you using? Best, Vicente