From 60a0d49e77cf6583b749ad6189751cd5d31bf3ee Mon Sep 17 00:00:00 2001
From: Jan Korous <jkorous@apple.com>
Date: Mon, 15 Jul 2019 23:14:00 +0000
Subject: [PATCH] [DirectoryWatcher][linux] Fix for older kernels

IN_EXCL_UNLINK exists since Linux 2.6.36

Differential Revision: https://reviews.llvm.org/D64764

llvm-svn: 366152
---
 .../DirectoryWatcher/linux/DirectoryWatcher-linux.cpp    | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/clang/lib/DirectoryWatcher/linux/DirectoryWatcher-linux.cpp b/clang/lib/DirectoryWatcher/linux/DirectoryWatcher-linux.cpp
index 0c9f799b638d..6d7d69da4db5 100644
--- a/clang/lib/DirectoryWatcher/linux/DirectoryWatcher-linux.cpp
+++ b/clang/lib/DirectoryWatcher/linux/DirectoryWatcher-linux.cpp
@@ -24,6 +24,7 @@
 #include <vector>
 
 #include <fcntl.h>
+#include <linux/version.h>
 #include <sys/epoll.h>
 #include <sys/inotify.h>
 #include <unistd.h>
@@ -332,8 +333,12 @@ std::unique_ptr<DirectoryWatcher> clang::DirectoryWatcher::create(
 
   const int InotifyWD = inotify_add_watch(
       InotifyFD, Path.str().c_str(),
-      IN_CREATE | IN_DELETE | IN_DELETE_SELF | IN_EXCL_UNLINK | IN_MODIFY |
-          IN_MOVED_FROM | IN_MOVE_SELF | IN_MOVED_TO | IN_ONLYDIR | IN_IGNORED);
+      IN_CREATE | IN_DELETE | IN_DELETE_SELF | IN_MODIFY |
+      IN_MOVED_FROM | IN_MOVE_SELF | IN_MOVED_TO | IN_ONLYDIR | IN_IGNORED
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
+      | IN_EXCL_UNLINK
+#endif
+      );
   if (InotifyWD == -1)
     return nullptr;