id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
8293	Unused Variable Warnings in Boost.Units due to BOOST_UNITS_STATIC_CONSTANT	ahundt	Matthias Schabel	"In clang every globally declared unit using BOOST_UNITS_STATIC_CONSTANT produces an unused variable warning, resulting in hundreds of warnings.

Compiler version:
c++ --version
Apple LLVM version 4.2 (clang-425.0.24) (based on LLVM 3.2svn)
Target: x86_64-apple-darwin12.2.0
Thread model: posix

Here is one sample:

                            ^
/opt/local/include/boost/units/static_constant.hpp:27:24: note: expanded from macro 'BOOST_UNITS_STATIC_CONSTANT'
    static const type& name = name##_instance_t<true>::instance;   \
                       ^
In file included from redacted.cpp:18:
In file included from redacted2.h:20:
In file included from redacted3.h:25:
In file included from /opt/local/include/boost/units/systems/si.hpp:24:
/opt/local/include/boost/units/systems/si/acceleration.hpp:27:29: warning: unused variable 'metre_per_second_squared' [-Wunused-variable]
BOOST_UNITS_STATIC_CONSTANT(metre_per_second_squared,acceleration);
                            ^"	Bugs	new	To Be Determined	units	Boost 1.53.0	Problem