1 `fallthrough` may be redefined (as in OpenZFS's spl), so use `__fallthrough`
3 --- boost_1_79_0/boost/config/compiler/gcc.hpp.orig 2022-06-04 19:46:23.536373946 +0200
4 +++ boost_1_79_0/boost/config/compiler/gcc.hpp 2022-06-08 17:18:20.938885867 +0200
9 -# define BOOST_FALLTHROUGH __attribute__((fallthrough))
10 +# define BOOST_FALLTHROUGH __attribute__((__fallthrough__))
13 #if (__GNUC__ < 11) && defined(__MINGW32__) && !defined(__MINGW64__)