Index: compiler-rt/trunk/CMakeLists.txt
===================================================================
--- compiler-rt/trunk/CMakeLists.txt
+++ compiler-rt/trunk/CMakeLists.txt
@@ -182,7 +182,26 @@
 pythonize_bool(COMPILER_RT_DEBUG)
 
 option(COMPILER_RT_INTERCEPT_LIBDISPATCH
-  "Support interception of libdispatch (GCD). Requires '-fblocks'." OFF)
+  "Support interception of libdispatch (GCD). Requires '-fblocks'" OFF)
+option(COMPILER_RT_BLOCKS_RUNTIME_LIBRARY_PATH
+  "Library search path for blocks runtime (-lBlocksRuntime)" "")
+option(COMPILER_RT_LIBDISPATCH_LIBRARY_PATH
+  "Library search path for libdispatch (-ldispatch)" "")
+if (COMPILER_RT_INTERCEPT_LIBDISPATCH)
+  set(COMPILER_RT_INTERCEPT_LIBDISPATCH_CFLAGS -fblocks)
+  set(COMPILER_RT_INTERCEPT_LIBDISPATCH_LINK_FLAGS)
+  if (COMPILER_RT_BLOCKS_RUNTIME_LIBRARY_PATH)
+    list(APPEND COMPILER_RT_INTERCEPT_LIBDISPATCH_LINK_FLAGS
+        -L${COMPILER_RT_BLOCKS_RUNTIME_LIBRARY_PATH}
+        -Wl,-rpath=${COMPILER_RT_BLOCKS_RUNTIME_LIBRARY_PATH})
+  endif()
+  if (COMPILER_RT_LIBDISPATCH_LIBRARY_PATH)
+    list(APPEND COMPILER_RT_INTERCEPT_LIBDISPATCH_LINK_FLAGS
+        -L${COMPILER_RT_LIBDISPATCH_LIBRARY_PATH}
+        -Wl,-rpath=${COMPILER_RT_LIBDISPATCH_LIBRARY_PATH})
+  endif()
+  list(APPEND COMPILER_RT_INTERCEPT_LIBDISPATCH_LINK_FLAGS -lBlocksRuntime -ldispatch)
+endif()
 if (APPLE) # Always enable on Apple platforms.
   set(COMPILER_RT_INTERCEPT_LIBDISPATCH ON)
 endif()
Index: compiler-rt/trunk/cmake/Modules/AddCompilerRT.cmake
===================================================================
--- compiler-rt/trunk/cmake/Modules/AddCompilerRT.cmake
+++ compiler-rt/trunk/cmake/Modules/AddCompilerRT.cmake
@@ -595,6 +595,7 @@
                -DCMAKE_C_FLAGS=${LIBCXX_C_FLAGS}
                -DCMAKE_CXX_FLAGS=${LIBCXX_CXX_FLAGS}
                -DCMAKE_BUILD_TYPE=Release
+               -DCMAKE_TRY_COMPILE_TARGET_TYPE=STATIC_LIBRARY
                -DLLVM_PATH=${LLVM_MAIN_SRC_DIR}
                -DLLVM_BINARY_DIR=${prefix}
                -DLLVM_LIBRARY_OUTPUT_INTDIR=${prefix}/lib
Index: compiler-rt/trunk/lib/tsan/CMakeLists.txt
===================================================================
--- compiler-rt/trunk/lib/tsan/CMakeLists.txt
+++ compiler-rt/trunk/lib/tsan/CMakeLists.txt
@@ -72,10 +72,7 @@
 
 if(COMPILER_RT_INTERCEPT_LIBDISPATCH)
   list(APPEND TSAN_SOURCES rtl/tsan_libdispatch.cc)
-  # Libdispatch support for non-Apple platforms requires '-fblocks'.
-  if (NOT APPLE)
-    list(APPEND TSAN_RTL_CFLAGS "-fblocks")
-  endif()
+  list(APPEND TSAN_RTL_CFLAGS ${COMPILER_RT_INTERCEPT_LIBDISPATCH_CFLAGS})
 endif()
 
 set(TSAN_HEADERS
Index: compiler-rt/trunk/lib/tsan/tests/CMakeLists.txt
===================================================================
--- compiler-rt/trunk/lib/tsan/tests/CMakeLists.txt
+++ compiler-rt/trunk/lib/tsan/tests/CMakeLists.txt
@@ -45,6 +45,7 @@
 else()
   list(APPEND LINK_FLAGS -fsanitize=thread)
   list(APPEND LINK_FLAGS -lm)
+  list(APPEND LINK_FLAGS ${COMPILER_RT_INTERCEPT_LIBDISPATCH_LINK_FLAGS})
 endif()
 
 set(TSAN_RTL_HEADERS)
Index: compiler-rt/trunk/test/tsan/CMakeLists.txt
===================================================================
--- compiler-rt/trunk/test/tsan/CMakeLists.txt
+++ compiler-rt/trunk/test/tsan/CMakeLists.txt
@@ -31,6 +31,9 @@
   string(TOLOWER "-${arch}" TSAN_TEST_CONFIG_SUFFIX)
   get_test_cc_for_arch(${arch} TSAN_TEST_TARGET_CC TSAN_TEST_TARGET_CFLAGS)
 
+  string(REPLACE ";" " " LIBDISPATCH_LINK_FLAGS_STRING " ${COMPILER_RT_INTERCEPT_LIBDISPATCH_LINK_FLAGS}")
+  string(APPEND TSAN_TEST_TARGET_CFLAGS ${LIBDISPATCH_LINK_FLAGS_STRING})
+
   string(TOUPPER ${arch} ARCH_UPPER_CASE)
   set(CONFIG_NAME ${ARCH_UPPER_CASE}Config)