Silence -Wimplicit-fallthrough warnings Use a macro that dispatches to the compiler-specific magic to silence implicit fallthrough warnings when the fallthrough was actually intended. The code already featured comments, so these are actually safe to place. (Unfortunately, Clang does not recognize any comment as "fall through" comment, and GCC only recognizes some variations of "fall through", not "pass through". Moreover, one of the comments replaced here had a typo...)