bpo-41617: Fix pycore_byteswap.h to support clang 3.0 (GH-22042) (GH-22044)
__builtin_bswap16() is not available in LLVM clang 3.0.
(cherry picked from commit e6905e4c82
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@ -15,10 +15,12 @@ extern "C" {
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# error "this header requires Py_BUILD_CORE define"
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#endif
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#if defined(__clang__) || \
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(defined(__GNUC__) && \
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((__GNUC__ >= 5) || (__GNUC__ == 4) && (__GNUC_MINOR__ >= 8)))
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/* __builtin_bswap16() is available since GCC 4.8,
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#if ((defined(__GNUC__) \
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&& ((__GNUC__ >= 5) || (__GNUC__ == 4) && (__GNUC_MINOR__ >= 8))) \
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|| (defined(__clang__) \
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&& (__clang_major__ >= 4 \
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|| (__clang_major__ == 3 && __clang_minor__ >= 2))))
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/* __builtin_bswap16() is available since GCC 4.8 and clang 3.2,
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__builtin_bswap32() is available since GCC 4.3,
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__builtin_bswap64() is available since GCC 4.3. */
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# define _PY_HAVE_BUILTIN_BSWAP
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@ -0,0 +1,2 @@
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Fix ``pycore_byteswap.h`` header file to support old clang versions:
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``__builtin_bswap16()`` is not available in LLVM clang 3.0.
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