[issue30923] Add -Wimplicit-fallthrough=0 to Makefile ?

[Stefan Krah]

Stefan Krah added the comment:

So I installed gcc-7.2.0 from source. Hilariously compiling gcc *itself*
emits fallthrough warnings!

Then I tried to be a good open source drone and add 20 /* fall through */
comments to libmpdec.

gcc is too stupid to recognize the /* fall through */ at the #endif
position.


Perhaps the author of this gcc warning wants to submit a patch.

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