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bpo-41875: Use __builtin_unreachable when possible (GH-22433) 

(cherry picked from commit 24ba3b0df5)

Co-authored-by: Dong-hee Na <donghee.na92@gmail.com>
This commit is contained in:
Miss Islington (bot) 2020-09-28 15:16:24 -07:00 committed by Łukasz Langa
parent 87e94e151c
commit df71b65a88
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GPG Key ID: B26995E310250568
2 changed files with 5 additions and 1 deletions
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4
Include/pymacro.h
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@ -118,7 +118,9 @@
"We've reached an unreachable state. Anything is possible.\n" \
"The limits were in our heads all along. Follow your dreams.\n" \
"https://xkcd.com/2200")
#elif defined(__GNUC__) || defined(__clang__) || defined(__INTEL_COMPILER)
#elif defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5))
# define Py_UNREACHABLE() __builtin_unreachable()
#elif defined(__clang__) || defined(__INTEL_COMPILER)
# define Py_UNREACHABLE() __builtin_unreachable()
#elif defined(_MSC_VER)
# define Py_UNREACHABLE() __assume(0)

2
Misc/NEWS.d/next/Build/2020-09-28-21-56-51.bpo-38249.uzMCaZ.rst Normal file
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@ -0,0 +1,2 @@
Update :c:macro:`Py_UNREACHABLE` to use __builtin_unreachable() if only the
compiler is able to use it. Patch by Dong-hee Na.