id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
7434	"Lock used in flyweight causes erroneous ""unused variable"" warning when compiling with clang"	Pierre Imai <pierre.imai@…>	Joaquín M López Muñoz	"The lock functionality in boost/flyweight/detail/flyweight_core.hpp causes the following warning when compiled with ""Apple clang version 4.0 (tags/Apple/clang-421.0.60) (based on LLVM 3.1svn)"" with option ""-Wunused-variable"":

{{{
In file included from /opt/local/include/boost/flyweight/flyweight.hpp:22:
/opt/local/include/boost/flyweight/detail/flyweight_core.hpp:189:22: error: unused variable 'lock' [-Werror,-Wunused-variable]
    lock_type        lock(mutex());
}}}

This problem can be fixed by adding the following code to the file, before / after the corresponding blocks for MSVC

{{{
#ifdef __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored ""-Wunused-variable""
#endif
}}}

{{{
#ifdef __clang__
#pragma clang diagnostic pop
#endif
}}}

"	Bugs	closed	To Be Determined	flyweight	Boost 1.51.0	Problem	wontfix	clang unused variable warning