From 18aed6a623f86f02eb342205d4fc9c7f6928805d Mon Sep 17 00:00:00 2001
From: Adam Buchbinder <abuchbinder@google.com>
Date: Wed, 12 Jul 2017 13:04:49 -0700
Subject: [PATCH] btrfs-progs: build: Enable ThreadSanitizer, using D=tsan

Tested with clang-3.9. We have to enable PIE,
(https://clang.llvm.org/docs/ThreadSanitizer.html)

Signed-off-by: Adam Buchbinder <abuchbinder@google.com>
Signed-off-by: David Sterba <dsterba@suse.com>
---
 Makefile | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Makefile b/Makefile
index 487626f3..b3e2b636 100644
--- a/Makefile
+++ b/Makefile
@@ -17,6 +17,7 @@
 #                  abort   - call abort() on first error (dumps core)
 #                  all     - shortcut for all of the above
 #                  asan    - enable address sanitizer compiler feature
+#                  tsan    - enable thread sanitizer compiler feature
 #                  ubsan   - undefined behaviour sanitizer compiler feature
 #                  bcheck  - extended build checks
 #   W=123          build with warnings (default: off)
@@ -157,6 +158,11 @@ ifneq (,$(findstring asan,$(D)))
   DEBUG_CFLAGS_INTERNAL += -fsanitize=address
 endif
 
+ifneq (,$(findstring tsan,$(D)))
+  DEBUG_CFLAGS_INTERNAL += -fsanitize=thread -fPIE
+  LD_FLAGS += -fsanitize=thread -ltsan -pie
+endif
+
 ifneq (,$(findstring ubsan,$(D)))
   DEBUG_CFLAGS_INTERNAL += -fsanitize=undefined
 endif