Comment 3 for bug 1882167

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Po-Hsu Lin (cypressyew) wrote : Re: ubuntu_zfs_xfs_generic failed to build on X-4.4

This option appears in the "fio" repo:
ubuntu@kernel01:~/autotest/client/tmp/ubuntu_zfs_xfs_generic/src/xfstests-bld$ grep -r "Wimplicit-fallthrough" *
fio/configure:# check if gcc has -Wimplicit-fallthrough
fio/configure:if compile_prog "-Wimplicit-fallthrough" "" "-Wimplicit-fallthrough"; then
fio/configure:print_config "-Wimplicit-fallthrough" "$fallthrough"
fio/configure: CFLAGS="$CFLAGS -Wimplicit-fallthrough"

$ gcc --version
gcc (Ubuntu 5.4.0-6ubuntu1~16.04.12) 5.4.0 20160609