builds, which was the apparent consensus of PR8973 and llvmdev.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127608
91177308-0d34-0410-b5e6-
96231b3b80d8
decl
#endif
+// LLVM_BUILTIN_UNREACHABLE - On compilers which support it, expands
+// to an expression which states that it is undefined behavior for the
+// compiler to reach this point.
+#if defined(__clang__) || (__GNUC__ > 4) \
+ || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
+# define LLVM_BUILTIN_UNREACHABLE __builtin_unreachable()
+#else
+#ifdef __cplusplus
+extern "C" LLVM_ATTRIBUTE_NORETURN void abort();
+#else
+extern LLVM_ATTRIBUTE_NORETURN void abort();
+#endif
+# define LLVM_BUILTIN_UNREACHABLE abort()
+#endif
+
#endif
#define llvm_unreachable(msg) \
::llvm::llvm_unreachable_internal(msg, __FILE__, __LINE__)
#else
-#define llvm_unreachable(msg) ::llvm::llvm_unreachable_internal()
+#define llvm_unreachable(msg) LLVM_BUILTIN_UNREACHABLE
#endif
#endif