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gh-107249: Implement Py_UNUSED() for MSVC #107250

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Jul 25, 2023
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gh-107249: Implement Py_UNUSED() for MSVC #107250

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9 changes: 9 additions & 0 deletions Include/pymacro.h
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Original file line number Diff line number Diff line change
Expand Up @@ -118,6 +118,15 @@
*/
#if defined(__GNUC__) || defined(__clang__)
# define Py_UNUSED(name) _unused_ ## name __attribute__((unused))
#elif defined(_MSC_VER)
// Disable warning C4100: unreferenced formal parameter,
// declare the parameter,
// restore old compiler warnings.
# define Py_UNUSED(name) \
__pragma(warning(push)) \
__pragma(warning(suppress: 4100)) \
_unused_ ## name \
__pragma(warning(pop))
#else
# define Py_UNUSED(name) _unused_ ## name
#endif
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/C API/2023-07-25-17-23-08.gh-issue-107249.xqk2ke.rst
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@@ -0,0 +1,2 @@
Implement the :c:macro:`Py_UNUSED` macro for Windows MSVC compiler. Patch by
Victor Stinner.
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