commit cca896e13b230a934fdb709b7f10c5451ffc25ba
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Mon Sep 28 15:16:24 2020 -0700
committer GitHub <noreply@github.com> Mon Sep 28 15:16:24 2020 -0700
tree b16efb876f7f478b2d7c73c166beb77fb875c65c
parent 048f54dc75d51e8a1c5822ab7b2828295192aaa5

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

(cherry picked from commit 24ba3b0df5e5f2f237d7b23b4017ba12f16320ae)

Co-authored-by: Dong-hee Na <donghee.na92@gmail.com>

Include/pymacro.h

diff --git a/Include/pymacro.h b/Include/pymacro.h
index 856cae7..202b936 100644
--- a/Include/pymacro.h
+++ b/Include/pymacro.h
@@ -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)