AppVeyor Python 3.5 - 3.8 builds on Mac are currently failing, evidently due to the following:
src/main/c/jni/org_jpy_PyLib.c:331:9: error: implicit declaration of function 'JPy_free' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
JPy_free();
^
In previous Mac builds it was:
src/main/c/jni/org_jpy_PyLib.c:331:9: error: implicit declaration of function 'JPy_free' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
JPy_free();
^
Current Windows and Linux builds also give a warning rather than an error here. We should either disable the -Werror flag in the Mac build or fix the implicit declaration itself.