Compilation error with clang++ 3.9.1
Compilation with clang++ 3.9.1 fails with :
escape.cc:70:11: error: use of the 'fallthrough' attribute is a C++1z extension [-Werror,-Wc++1z-extensions]
SPOT_FALLTHROUGH;
^
../../spot/misc/common.hh:132:32: note: expanded from macro 'SPOT_FALLTHROUGH'
# define SPOT_FALLTHROUGH [[fallthrough]]
^
escape.cc:153:15: error: use of the 'fallthrough' attribute is a C++1z extension [-Werror,-Wc++1z-extensions]
SPOT_FALLTHROUGH;
^
../../spot/misc/common.hh:132:32: note: expanded from macro 'SPOT_FALLTHROUGH'
# define SPOT_FALLTHROUGH [[fallthrough]]
^