[llvm] r367084 - Fix macOS build after r358716

[Yi Kong via llvm-commits]

Author: kongyi
Date: Thu Jul 25 22:17:14 2019
New Revision: 367084

URL: http://llvm.org/viewvc/llvm-project?rev=367084&view=rev
Log:
Fix macOS build after r358716

COPYFILE_CLONE is only defined on newer macOS versions, using it without
check breaks build on systems running legacy OS and toolchain.

Differential Revision: https://reviews.llvm.org/D65317

Modified:
    llvm/trunk/lib/Support/Unix/Path.inc

Modified: llvm/trunk/lib/Support/Unix/Path.inc
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Support/Unix/Path.inc?rev=367084&r1=367083&r2=367084&view=diff
==============================================================================
--- llvm/trunk/lib/Support/Unix/Path.inc (original)
+++ llvm/trunk/lib/Support/Unix/Path.inc Thu Jul 25 22:17:14 2019
@@ -1203,7 +1203,7 @@ namespace fs {
 /// implementation.
 std::error_code copy_file(const Twine &From, const Twine &To) {
   uint32_t Flag = COPYFILE_DATA;
-#if __has_builtin(__builtin_available)
+#if __has_builtin(__builtin_available) && defined(COPYFILE_CLONE)
   if (__builtin_available(macos 10.12, *)) {
     bool IsSymlink;
     if (std::error_code Error = is_symlink_file(From, IsSymlink))