Roumen Petrov <bugtr...@roumenpetrov.info> added the comment: In general those functions has to be part of, lets call it "python runtime/portable interface" . With current build system you may create a build-in module lets call it mathport and to add some functions . To the list a will add function atan2 from math module. I don't know why the test cases for cmath pass on platforms with non-expected behaviour of atan2-may be build boots lack those platforms. To me is expected for all platforms on which "tanh preserves the sign of zero" configure test case fail atan2 to fail too and cmath functions that use atan2 to fail.
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