Index: llvm/trunk/runtimes/CMakeLists.txt
===================================================================
--- llvm/trunk/runtimes/CMakeLists.txt
+++ llvm/trunk/runtimes/CMakeLists.txt
@@ -216,6 +216,8 @@
                                         -DLLVM_RUNTIME_OUTPUT_INTDIR=${LLVM_TOOLS_BINARY_DIR}
                                         -DCMAKE_C_COMPILER_TARGET=${TARGET_TRIPLE}
                                         -DCMAKE_ASM_COMPILER_TARGET=${TARGET_TRIPLE}
+                                        -DCMAKE_C_COMPILER_WORKS=ON
+                                        -DCMAKE_ASM_COMPILER_WORKS=ON
                              PASSTHROUGH_PREFIXES COMPILER_RT
                              USE_TOOLCHAIN
                              ${EXTRA_ARGS})
@@ -244,9 +246,9 @@
                                         -DLLVM_RUNTIME_OUTPUT_INTDIR=${LLVM_TOOLS_BINARY_DIR}
                                         -DCMAKE_C_COMPILER_TARGET=${target}
                                         -DCMAKE_ASM_COMPILER_TARGET=${target}
-                                        -DCMAKE_C_COMPILER_WORKS=On
-                                        -DCMAKE_ASM_COMPILER_WORKS=On
-                                        -DCOMPILER_RT_DEFAULT_TARGET_ONLY=On
+                                        -DCMAKE_C_COMPILER_WORKS=ON
+                                        -DCMAKE_ASM_COMPILER_WORKS=ON
+                                        -DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON
                                         ${${target}_extra_args}
                              TOOLCHAIN_TOOLS clang lld llvm-ar llvm-ranlib
                              PASSTHROUGH_PREFIXES COMPILER_RT
@@ -324,6 +326,9 @@
                              CMAKE_ARGS -DCOMPILER_RT_BUILD_BUILTINS=Off
                                         -DLLVM_INCLUDE_TESTS=${LLVM_INCLUDE_TESTS}
                                         -DLLVM_LIBRARY_DIR=${LLVM_LIBRARY_DIR}
+                                        -DCMAKE_C_COMPILER_WORKS=ON
+                                        -DCMAKE_CXX_COMPILER_WORKS=ON
+                                        -DCMAKE_ASM_COMPILER_WORKS=ON
                              PASSTHROUGH_PREFIXES ${prefixes}
                              EXTRA_TARGETS ${extra_targets}
                                            ${test_targets}