Correctly set rpath for unittests.

This lets us run the unittest from the command line without setting
LD_LIBRARY_PATH.

llvm-svn: 202509
diff --git a/llvm/unittests/CMakeLists.txt b/llvm/unittests/CMakeLists.txt
index 84685e1..9e2f60c 100644
--- a/llvm/unittests/CMakeLists.txt
+++ b/llvm/unittests/CMakeLists.txt
@@ -1,6 +1,12 @@
 add_custom_target(UnitTests)
 set_target_properties(UnitTests PROPERTIES FOLDER "Tests")
 
+if (APPLE)
+  set(CMAKE_INSTALL_RPATH "@executable_path/../../lib")
+else(UNIX)
+  set(CMAKE_INSTALL_RPATH "\$ORIGIN/../../lib")
+endif()
+
 function(add_llvm_unittest test_dirname)
   add_unittest(UnitTests ${test_dirname} ${ARGN})
 endfunction()