id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
6773	Add cxxabi.h detection code for clang in boost/units/detail/utility.hpp	Michel Morin	Jürgen Hunold	"`boost::units::detail::demangle` does not demangle names on clang with libc++ even when `cxxabi.h` is available. 
Attached a patch to add `cxxabi.h` detection code for clang. 
This allows `boost::units::detail::demangle` to use `abi::__cxa_demangle` on clang when `cxxabi.h` is available. 

The patch uses clang's `__has_include` macro to detect `cxxabi.h`. 
This macro checks the existence of a header file. 
For reference, here is the link to `__has_include` documentation: 
http://clang.llvm.org/docs/LanguageExtensions.html#has_include"	Patches	closed	Boost 1.57.0	units	Boost Development Trunk	Problem	fixed