After rL357618, quote ${CMAKE_THREAD_LIBS_INIT} so CMake does not

complain when the variable is empty.  Fixes PR 41401.


git-svn-id: https://llvm.org/svn/llvm-project/openmp/trunk@357828 91177308-0d34-0410-b5e6-96231b3b80d8

cmake/OpenMPTesting.cmake

@@ -123,7 +123,7 @@ else()
   # Unfortunately the top-level cmake/config-ix.cmake file mangles CMake's
   # CMAKE_THREAD_LIBS_INIT variable from the FindThreads package, so work
   # around that, until it is fixed there.
-  if(${CMAKE_THREAD_LIBS_INIT} STREQUAL "-lpthread")
+  if("${CMAKE_THREAD_LIBS_INIT}" STREQUAL "-lpthread")
     set(OPENMP_TEST_COMPILER_THREAD_FLAGS "-pthread")
   else()
     set(OPENMP_TEST_COMPILER_THREAD_FLAGS "${CMAKE_THREAD_LIBS_INIT}")