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Support Py_UNUSED() on clang (GH-13544)

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Victor Stinner 2019-05-24 15:16:08 +02:00 committed by GitHub
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commit b3a9843cd1
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2 changed files with 9 additions and 4 deletions
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2
Doc/c-api/intro.rst
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@ -156,7 +156,7 @@ complete listing.
.. c:macro:: Py_UNUSED(arg)
Use this for unused arguments in a function definition to silence compiler
warnings, e.g. ``PyObject* func(PyObject *Py_UNUSED(ignored))``.
warnings. Example: ``int func(int a, int Py_UNUSED(b)) { return a; }``.
.. versionadded:: 3.4

11
Include/pymacro.h
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@ -89,10 +89,15 @@
/* Check if pointer "p" is aligned to "a"-bytes boundary. */
#define _Py_IS_ALIGNED(p, a) (!((uintptr_t)(p) & (uintptr_t)((a) - 1)))
#ifdef __GNUC__
#define Py_UNUSED(name) _unused_ ## name __attribute__((unused))
/* Use this for unused arguments in a function definition to silence compiler
* warnings. Example:
*
* int func(int a, int Py_UNUSED(b)) { return a; }
*/
#if defined(__GNUC__) || defined(__clang__)
# define Py_UNUSED(name) _unused_ ## name __attribute__((unused))
#else
#define Py_UNUSED(name) _unused_ ## name
# define Py_UNUSED(name) _unused_ ## name
#endif
#define Py_UNREACHABLE() abort()