[ORC-RT] Handle missing __has_builtin operator.

For compilers that do not support __has_builtin just return '0'. This should fix
the bot failure at https://lab.llvm.org/buildbot/#/builders/165/builds/3761.

diff --git a/compiler-rt/lib/orc/compiler.h b/compiler-rt/lib/orc/compiler.h
index fcc4f20..a262fb4 100644 (file)
--- a/compiler-rt/lib/orc/compiler.h
+++ b/compiler-rt/lib/orc/compiler.h
@@ -18,6 +18,10 @@
 #define ORC_RT_INTERFACE extern "C" __attribute__((visibility("default")))
 #define ORC_RT_HIDDEN __attribute__((visibility("hidden")))
 
+#ifndef __has_builtin
+# define __has_builtin(x) 0
+#endif
+
 // Only use __has_cpp_attribute in C++ mode. GCC defines __has_cpp_attribute in
 // C mode, but the :: in __has_cpp_attribute(scoped::attribute) is invalid.
 #ifndef ORC_RT_HAS_CPP_ATTRIBUTE