He Zheさ > I'm using GCC 9.1.0 > From what I know, the refreshed "-Wimplicit-fallthrough" is introduced no > later than GCC7. > https://developers.redhat.com/blog/2017/03/10/wimplicit-fallthrough-in-gcc-7/
Whao, I am v6.3. $ gcc --version gcc (Debian 6.3.0-18+deb9u1) 6.3.0 20170516 Copyright (C) 2016 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. I will prepare another environment and try newer gcc. This may need some time. Please be patient. J. R. Okajima
