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Adapt PyCode_New() calls to changed C-API in Py3.8, which now takes an additional argument for the pos-only args count.
Closes GH-2938.

Disable "fast_gil" support in Py3<3.6 since Py3<3.5.2 lacks _PyThreadState_UncheckedGet() and crashes when calling PyThreadState_GET() without a thread state.

Make the cpdef override check work with Python subclasses of extension types again that do not initialise their own dict.
This lead to a crash with dict versioning in Py3.6+.
Closes GH-2823.

This avoids the compiler warning
  warning: cast discards ‘const’ qualifier from pointer target type [-Wcast-qual]
by casting the pointer to uintptr_t before removing the const-ness.

The warning was introduced in 6cd70f09

Also merge the two places that define stdint types.

Still requires the more conservative __index__ here rather than a possibly
truncating __int__ because this is used in a context where floating point
values should probably be treated specially.

This fixes Github issue #2752.

Closes #2731.

Also add a compile time check for SIZEOF_VOID_P.

This fixes #2670.

See also
https://bugs.python.org/issue35037
https://bugs.python.org/issue4709

Closes #2692.

Also add a compile time check for SIZEOF_VOID_P.

This fixes #2670.

See also
https://bugs.python.org/issue35037
https://bugs.python.org/issue4709

Try to call "__rmod__()" during string %-formatting when the right side is a string subtype that implements it.
See https://bugs.python.org/issue28598

Raise a more appropriate ImportError rather than a generic RuntimeError when trying to re-import a Cython module in a different subinterpreter with PEP-489.

Move PyFrame localsplus offset calculation to a more appropriate utility file where it can be included conditionally.

Compute the offset of the PyFrameObject member "f_localsplus" at runtime,
because the layout of PyFrameObject differs between regular C-python and
Stackless Python.

Add METH_STACKLESS to the bit mask used to test the call signature.

Technically these functions were around in some of the Python 3.4
prereleases. So add a more accurate version constraint.

To handle the Python version differences, handle the definitions of
`PyMem_Raw*` functions in `ModuleSetupCode`. Then extern them in
`cpython.mem` without using a version check or a specific header.

Closes #2494.

Closes #2494.

Add safety checks to prevent exception subtype checks with non-types. This raises a TypeError in Py3 now and we should handle that at some point.

Closes #2425.

Remove redundant helper function "__Pyx_ImportModule()" which was only needed in Py<2.6 when PyObject_GetAttrString() and PyImport_ImportModule() did not take const string arguments.

Mark several one-time functions (used during module init) with CYTHON_SMALL_CODE to reduce their binary code impact on the overall module size.

Avoid segfault due to a bug in g++ 4.4.7 when the -Os setting for the module init function is enabled.
Closes #2235.