Is the reason that you need goto in every one of these blocks that PyErr_Occcurred() will get reset if you make other PyModule_AddIntMacro calls that don't fail along the way?

Either way, I'm mildly tempted to suggest adding a wrapper macro like:

But I dunno. I'm torn between the principles of "don't repeat yourself" and "don't write a preprocessor macro with a goto in it (you monster)".

Between the two options, I'm personally +0 on repetition. Incorrect error handling for the whole PyModule_Add family of functions is rampant in the stdlib (see my work in bpo-38823), and I think reinforcing the correct usage is good to have to keep people from repeating the same old patterns (especially in outside projects).

Is the reason that you need goto in every one of these blocks that PyErr_Occcurred() will get reset if you make other PyModule_AddIntMacro calls that don't fail along the way?

No, I just try to make the Py_DECREF(m);return NULL; looks like a common processing item.

I think reinforcing the correct usage is good to have to keep people from repeating the same old patterns

+1

I dislike macros hiding a goto. A goto statement is dangerous, I prefer to make it explicit. The "if (...) { goto error; }" is a very common pattern in Python, especially in initialization code.