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The gcc 7 does check for switch statement fall through cases, and if legit, such complaint can besilenced by /* FALLTHROUGH */ comment. Unfortunately such comment is quite limited, but will still notify the reader. This patch is backport from illumos, see https://www.illumos.org/rb/r/941/ Reviewed by: eadler Differential Revision: https://reviews.freebsd.org/D14663