Add thread sanitizer option to cmake

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Thread sanitizer (TSAN) is a tool that detect data races, deadlocks  between threads. (it also sometimes report heap-use-after-free in same thread check #71 for issues reported in current repo)

For more information, checkout https://clang.llvm.org/docs/ThreadSanitizer.html

Author: sherry-yuan

CMakeLists.txt

@@ -68,6 +68,18 @@ if(ACL_CODE_COVERAGE)
   endif()
 endif()
 
+# Flag for tsan scans
+option(ACL_TSAN "Build with tsan" OFF)
+message(STATUS "Build with tsan: ${ACL_TSAN}")
+if(ACL_TSAN)
+  if(CMAKE_COMPILER_IS_GNUCXX)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=thread -fno-omit-frame-pointer")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fsanitize=thread -fno-omit-frame-pointer")
+  else()
+    message(FATAL_ERROR "cannot build with tsan tools due to unsupported CXX compiler")
+  endif()
+endif()
+
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 ### Modified Debug flags
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