diff --git a/compiler-rt/cmake/Modules/CompilerRTUtils.cmake b/compiler-rt/cmake/Modules/CompilerRTUtils.cmake
--- a/compiler-rt/cmake/Modules/CompilerRTUtils.cmake
+++ b/compiler-rt/cmake/Modules/CompilerRTUtils.cmake
@@ -248,6 +248,8 @@
       string(REGEX REPLACE "[ \t]*[\r\n]+[ \t]*" ";" CONFIG_OUTPUT ${CONFIG_OUTPUT})
       list(GET CONFIG_OUTPUT 0 LDFLAGS)
       list(GET CONFIG_OUTPUT 1 LIBLIST)
+      file(TO_CMAKE_PATH "${LDFLAGS}" LDFLAGS)
+      file(TO_CMAKE_PATH "${LIBLIST}" LIBLIST)
       set(LLVM_XRAY_LDFLAGS ${LDFLAGS} CACHE STRING "Linker flags for LLVMXRay library")
       set(LLVM_XRAY_LIBLIST ${LIBLIST} CACHE STRING "Library list for LLVMXRay")
       set(COMPILER_RT_HAS_LLVMXRAY TRUE)
@@ -268,6 +270,8 @@
       if (LIBLIST STREQUAL "")
         message(WARNING "testingsupport library not installed, some tests will be skipped")
       else()
+        file(TO_CMAKE_PATH "${LDFLAGS}" LDFLAGS)
+        file(TO_CMAKE_PATH "${LIBLIST}" LIBLIST)
         set(LLVM_TESTINGSUPPORT_LDFLAGS ${LDFLAGS} CACHE STRING "Linker flags for LLVMTestingSupport library")
         set(LLVM_TESTINGSUPPORT_LIBLIST ${LIBLIST} CACHE STRING "Library list for LLVMTestingSupport")
         set(COMPILER_RT_HAS_LLVMTESTINGSUPPORT TRUE)