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"
This option appears in the "fio" repo: kernel01: ~/autotest/ client/ tmp/ubuntu_ zfs_xfs_ generic/ src/xfstests- bld$ grep -r "Wimplicit- fallthrough" * fallthrough fallthrough" "" "-Wimplicit- fallthrough" ; then print_config "-Wimplicit- fallthrough" "$fallthrough" fallthrough"
ubuntu@
fio/configure:# check if gcc has -Wimplicit-
fio/configure:if compile_prog "-Wimplicit-
fio/configure:
fio/configure: CFLAGS="$CFLAGS -Wimplicit-
$ gcc --version 16.04.12) 5.4.0 20160609
gcc (Ubuntu 5.4.0-6ubuntu1~