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

Fix constant folding of multiplied string literals when they appear in another constant expression. In this case, the multiplied value was lost and replaced by the original value.

Enable some tests that were unintentionally not being executed because docstrings in cdef functions are not visible to Python.

Make a test work in Py3.7 that changed behaviour in Python 3.7 ("generator_stop" future import became active by default).

Closes #2494.

Closes #2484.

Signed-off-by: Stefan Behnel <stefan_ml@behnel.de>

The change of making "tstate->exc_state" a struct was introduced in CPython 3.7.0a3 and not 3.7.0a2, which some people still seem to be using right now.

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.

Fix: reallowing tp_clear() in a subtype of an @no_gc_clear extension type generated an invalid C function call to the (non-existent) base type implementation.
Closes #2309.

This reverts commit eb0e4666.

Fix error reporting on very early errors when the Cython runtime configuration module is not set up yet.
See #2199.

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

Closes #1771.

Bug fix for boolean return using statement with internal commas.

Avoid uninitialised C variable (and thus potentially undefined behaviour), even if it's not actually being used in that case.