Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -1,5 +1,7 @@
 cmake_minimum_required(VERSION 3.2)
 
+include(CheckSymbolExists)
+
 # The test-suite is designed to be built in release mode anyway and
 # falls over unless -DNDEBUG is set.
 if (NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
@@ -95,6 +97,11 @@
   endif()
 endif()
 
+if("${ARCH}" STREQUAL "Mips")
+  check_symbol_exists(__mips16 "" MIPS_IS_MIPS16_ENABLED)
+  check_symbol_exists(__mips64 "" MIPS_IS_MIPS64_ENABLED)
+endif()
+
 add_subdirectory(tools)
 # Shortcut for the path to the fpcmp executable
 set(FPCMP ${CMAKE_BINARY_DIR}/tools/fpcmp)
Index: MultiSource/UnitTests/C++11/CMakeLists.txt
===================================================================
--- MultiSource/UnitTests/C++11/CMakeLists.txt
+++ MultiSource/UnitTests/C++11/CMakeLists.txt
@@ -1,5 +1,5 @@
 list(APPEND CPPFLAGS -std=c++11)
-string(FIND "${MIPSARCH}" "mips16" TMP1)
-if("" STREQUAL "${TMP1}")
+
+if(NOT MIPS_IS_MIPS16_ENABLED)
   llvm_add_subdirectories(frame_layout)
 endif()
Index: MultiSource/UnitTests/Mips/CMakeLists.txt
===================================================================
--- MultiSource/UnitTests/Mips/CMakeLists.txt
+++ MultiSource/UnitTests/Mips/CMakeLists.txt
@@ -1,4 +1,3 @@
-string(FIND "${MIPSARCH}" "mips16" TMP1)
-if("" STREQUAL "${TMP1}")
+if(MIPS_IS_MIPS16_ENABLED)
   llvm_add_subdirectories(Mips16)
 endif()
Index: SingleSource/UnitTests/CMakeLists.txt
===================================================================
--- SingleSource/UnitTests/CMakeLists.txt
+++ SingleSource/UnitTests/CMakeLists.txt
@@ -21,8 +21,8 @@
 endif()
 if("${ARCH}" STREQUAL "Mips")
   llvm_add_subdirectories(Mips)
-  string(FIND "${MIPSARCH}" "mips64" TMP2)
-  if("" STREQUAL "${TMP2}")
+  # Only MIPS 64-bit supports 8 bytes atomic operations.
+  if(NOT MIPS_IS_MIPS64_ENABLED)
     list(APPEND PROGRAMS_TO_SKIP AtomicOps)
   endif()
 endif()
Index: SingleSource/UnitTests/Mips/CMakeLists.txt
===================================================================
--- SingleSource/UnitTests/Mips/CMakeLists.txt
+++ SingleSource/UnitTests/Mips/CMakeLists.txt
@@ -1,4 +1,3 @@
-string(FIND "${MIPSARCH}" "mips16" TMP1)
-if(NOT "" STREQUAL "${TMP1}")
+if(MIPS_IS_MIPS16_ENABLED)
   llvm_add_subdirectories(Mips16)
 endif()