Index: compiler-rt/trunk/cmake/Modules/CompilerRTUtils.cmake
===================================================================
--- compiler-rt/trunk/cmake/Modules/CompilerRTUtils.cmake
+++ compiler-rt/trunk/cmake/Modules/CompilerRTUtils.cmake
@@ -236,6 +236,24 @@
     set(LLVM_TOOLS_BINARY_DIR ${TOOLS_BINARY_DIR} CACHE PATH "Path to llvm/bin")
     set(LLVM_INCLUDE_DIR ${INCLUDE_DIR} CACHE PATH "Paths to LLVM headers")
 
+    # Detect if we have the LLVMXRay and TestingSupport library installed and
+    # available from llvm-config.
+    execute_process(
+      COMMAND ${LLVM_CONFIG_PATH} "--ldflags" "--libs" "xray" "testingsupport"
+      RESULT_VARIABLE HAD_ERROR
+      OUTPUT_VARIABLE CONFIG_OUTPUT)
+    if (HAD_ERROR)
+      message(WARNING "llvm-config finding xray failed with status ${HAD_ERROR}")
+      set(COMPILER_RT_HAS_LLVMXRAY FALSE)
+    else()
+      string(REGEX REPLACE "[ \t]*[\r\n]+[ \t]*" ";" CONFIG_OUTPUT ${CONFIG_OUTPUT})
+      list(GET CONFIG_OUTPUT 0 LDFLAGS)
+      list(GET CONFIG_OUTPUT 1 LIBLIST)
+      set(LLVM_XRAY_LDFLAGS ${LDFLAGS} CACHE STRING "Linker flags for LLVMXRay library")
+      set(LLVM_XRAY_LIBLIST ${LIBLIST} CACHE STRING "Library list for LLVMXRay")
+      set(COMPILER_RT_HAS_LLVMXRAY TRUE)
+    endif()
+
     # Make use of LLVM CMake modules.
     # --cmakedir is supported since llvm r291218 (4.0 release)
     execute_process(
Index: compiler-rt/trunk/lib/xray/tests/CMakeLists.txt
===================================================================
--- compiler-rt/trunk/lib/xray/tests/CMakeLists.txt
+++ compiler-rt/trunk/lib/xray/tests/CMakeLists.txt
@@ -49,9 +49,8 @@
 set(XRAY_TEST_ARCH ${XRAY_SUPPORTED_ARCH})
 set(XRAY_UNITTEST_LINK_FLAGS
   ${CMAKE_THREAD_LIBS_INIT}
-  -l${SANITIZER_CXX_ABI_LIBRARY}
-  -fxray-instrument
-  )
+  -l${SANITIZER_CXX_ABI_LIBRARY})
+
 if (NOT APPLE)
   append_list_if(COMPILER_RT_HAS_LIBM -lm XRAY_UNITTEST_LINK_FLAGS)
   append_list_if(COMPILER_RT_HAS_LIBRT -lrt XRAY_UNITTEST_LINK_FLAGS)
@@ -62,6 +61,19 @@
   append_list_if(
     COMPILER_RT_HAS_TERMINFO
     -l${COMPILER_RT_TERMINFO_LIB} XRAY_UNITTEST_LINK_FLAGS)
+
+  if (COMPILER_RT_STANDALONE_BUILD)
+    append_list_if(COMPILER_RT_HAS_LLVMXRAY ${LLVM_XRAY_LDFLAGS} XRAY_UNITTEST_LINK_FLAGS)
+    append_list_if(COMPILER_RT_HAS_LLVMXRAY ${LLVM_XRAY_LIBLIST} XRAY_UNITTEST_LINK_FLAGS)
+  else()
+    # We add the library directories one at a time in our CFLAGS.
+    foreach (DIR ${LLVM_LIBRARY_DIR})
+      list(APPEND XRAY_UNITTEST_LINK_FLAGS -L${DIR})
+    endforeach()
+
+    # We also add the actual libraries to link as dependencies.
+    list(APPEND XRAY_UNITTEST_LINK_FLAGS -lLLVMXRay -lLLVMSupport -lLLVMTestingSupport)
+  endif()
 endif()
 
 macro(add_xray_unittest testname)
@@ -85,7 +97,7 @@
         DEPS gtest xray llvm-xray LLVMXRay LLVMTestingSupport
         CFLAGS ${XRAY_UNITTEST_CFLAGS}
         LINK_FLAGS ${TARGET_LINK_FLAGS} ${XRAY_UNITTEST_LINK_FLAGS}
-        -lLLVMXRay -lLLVMSupport -lLLVMTestingSupport)
+        )
       set_target_properties(XRayUnitTests
         PROPERTIES
         RUNTIME_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
Index: compiler-rt/trunk/lib/xray/tests/unit/CMakeLists.txt
===================================================================
--- compiler-rt/trunk/lib/xray/tests/unit/CMakeLists.txt
+++ compiler-rt/trunk/lib/xray/tests/unit/CMakeLists.txt
@@ -1,14 +1,8 @@
-add_xray_unittest(XRayBufferQueueTest SOURCES
-  buffer_queue_test.cc xray_unit_test_main.cc)
-add_xray_unittest(XRayAllocatorTest SOURCES
-  allocator_test.cc xray_unit_test_main.cc)
-add_xray_unittest(XRaySegmentedArrayTest SOURCES
-  segmented_array_test.cc xray_unit_test_main.cc)
-add_xray_unittest(XRayFunctionCallTrieTest SOURCES
-  function_call_trie_test.cc xray_unit_test_main.cc)
-add_xray_unittest(XRayProfileCollectorTest SOURCES
-  profile_collector_test.cc xray_unit_test_main.cc)
-
-add_xray_unittest(XRayFDRLoggingTest SOURCES
+add_xray_unittest(XRayTest SOURCES
+  buffer_queue_test.cc
+  allocator_test.cc
+  segmented_array_test.cc
+  function_call_trie_test.cc
+  profile_collector_test.cc
   fdr_log_writer_test.cc
   xray_unit_test_main.cc)
Index: llvm/trunk/lib/LLVMBuild.txt
===================================================================
--- llvm/trunk/lib/LLVMBuild.txt
+++ llvm/trunk/lib/LLVMBuild.txt
@@ -44,6 +44,7 @@
  ToolDrivers
  Transforms
  WindowsManifest
+ XRay
 
 [component_0]
 type = Group
Index: llvm/trunk/lib/XRay/LLVMBuild.txt
===================================================================
--- llvm/trunk/lib/XRay/LLVMBuild.txt
+++ llvm/trunk/lib/XRay/LLVMBuild.txt
@@ -0,0 +1,23 @@
+;===- ./lib/XRay/LLVMBuild.txt ---------------------------------*- Conf -*--===;
+;
+;                     The LLVM Compiler Infrastructure
+;
+; This file is distributed under the University of Illinois Open Source
+; License. See LICENSE.TXT for details.
+;
+;===------------------------------------------------------------------------===;
+;
+; This is an LLVMBuild description file for the components in this subdirectory.
+;
+; For more information on the LLVMBuild system, please see:
+;
+;   http://llvm.org/docs/LLVMBuild.html
+;
+;===------------------------------------------------------------------------===;
+
+[component_0]
+type = Library
+name = XRay
+parent = Libraries
+required_libraries = Support Object
+installed = 1