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gh-128902: Fix check for fallthrough attribute support #128903

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Merged
merged 2 commits into from
Jan 22, 2025
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gh-128902: Fix check for fallthrough attribute support #128903

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82bbdbd
Fix check for fallthrough attribute support
jmroot Jan 16, 2025
e24773d
📜🤖 Added by blurb_it.
blurb-it[bot] Jan 16, 2025
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9 changes: 7 additions & 2 deletions Include/pyport.h
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Original file line number Diff line number Diff line change
Expand Up @@ -625,8 +625,13 @@ extern "C" {
// case 2: code; break;
// }
//
// __attribute__((fallthrough)) was introduced in GCC 7.
#if _Py__has_attribute(fallthrough)
// __attribute__((fallthrough)) was introduced in GCC 7 and Clang 10 /
// Apple Clang 12.0. Earlier Clang versions support only the C++11
// style fallthrough attribute, not the GCC extension syntax used here,
// and __has_attribute(fallthrough) evaluates to 1.
#if _Py__has_attribute(fallthrough) && (!defined(__clang__) || \
(!defined(__apple_build_version__) && __clang_major__ >= 10) || \
(defined(__apple_build_version__) && __clang_major__ >= 12))
# define _Py_FALLTHROUGH __attribute__((fallthrough))
#else
# define _Py_FALLTHROUGH do { } while (0)
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Build/2025-01-16-03-35-37.gh-issue-128902.Dt7xtV.rst
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@@ -0,0 +1 @@
Fix compile errors with Clang 9 and older due to lack of ``__attribute__((fallthrough))`` support.
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