New issue 2817: Py_GCC_ATTRIBUTE missing
https://bitbucket.org/pypy/pypy/issues/2817/py_gcc_attribute-missing
Hrvoje Nikšić:
The `Py_GCC_ATTRIBUTE` macro is missing from the C API emulation headers. While
it is not strictly a part of the Python/C API as it's not documented, it also
does not begin with an underscore, so there is code out there that relies on it
in their own extensions. (I discovered that by attempting to compile in-house
Python/C extensions under PyPy.)
It can be easily added by copying the definition from CPython:
```
#!c
#if (!defined(__GNUC__) || __GNUC__ < 2 || \
(__GNUC__ == 2 && __GNUC_MINOR__ < 7) ) && \
!defined(RISCOS)
#define Py_GCC_ATTRIBUTE(x)
#else
#define Py_GCC_ATTRIBUTE(x) __attribute__(x)
#endif
```
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