When building with clang with all warnings and -Werror:
error: extension used [-Werror,-Wlanguage-extension-token]
#include BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP()
^
boost/typeof/typeof.hpp:197:13: note: expanded from macro 'BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP'
<boost/typeof/incr_registration_group.hpp>
When building with clang with all warnings and -Werror:
error: extension used [-Werror,-Wlanguage-extension-token]
#include BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP()
^
boost/typeof/typeof.hpp:197:13: note: expanded from macro 'BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP'
<boost/typeof/incr_registration_group.hpp>