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bpo-41875: Use __builtin_unreachable when possible

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Lines changed: 3 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -118,7 +118,9 @@`
`118`	`118`	`"We've reached an unreachable state. Anything is possible.\n" \`
`119`	`119`	`"The limits were in our heads all along. Follow your dreams.\n" \`
`120`	`120`	`"https://xkcd.com/2200")`
`121`		`-#elif defined(__GNUC__)\|\| defined(__clang__)\|\| defined(__INTEL_COMPILER)`
	`121`	`+#elif defined(__GNUC__)&& (__GNUC__>4\|\| (__GNUC__==4&&__GNUC_MINOR__ >=5))`
	`122`	`+# definePy_UNREACHABLE() __builtin_unreachable()`
	`123`	`+#elif defined(__clang__)\|\| defined(__INTEL_COMPILER)`
`122`	`124`	`# definePy_UNREACHABLE() __builtin_unreachable()`
`123`	`125`	`#elif defined(_MSC_VER)`
`124`	`126`	`# definePy_UNREACHABLE() __assume(0)`

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Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	+Update:c:macro:`Py_UNREACHABLE` to use __builtin_unreachable() if only the
	`2`	`+compiler is able to use it. Patch by Dong-hee Na.`

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