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gcc 8 has added a new warning heuristic to detect invalid function casts and a stock python build seems to hit that warning quite often. The most common is the cast of a METH_NOARGS function (that uses just one argument) to a PyCFunction. The fix is pretty simple but needs to be applied widely. I'm slowly knocking them off in my spare time; WIP here, which has a few other types of warnings mixed in that I'll sift out during submission and also create separate bug reports for:
https://github.com/siddhesh/cpython/tree/func-cast
I'll clean up and post PR(s) once I am done but I figured I should file this report first since it is a pretty big change in terms of number of files touched and wanted to be sure that I'm making changes the way the community prefers.