Stéphane Wirtel added the comment:

I am not for a backport, it's not a security fix or a bug fix.

for my case, I just want to "kill" the warnings, maybe we could check the 
version of gcc and add "-Wimplicit-fallthrough=0".

Here is a good explanation of the 'fallthrough' in gcc7 
https://developers.redhat.com/blog/2017/03/10/wimplicit-fallthrough-in-gcc-7/

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<http://bugs.python.org/issue30923>
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