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
@@ -248,8 +248,10 @@
       string(REGEX REPLACE "[ \t]*[\r\n]+[ \t]*" ";" CONFIG_OUTPUT ${CONFIG_OUTPUT})
       list(GET CONFIG_OUTPUT 0 LDFLAGS)
       list(GET CONFIG_OUTPUT 1 LIBLIST)
-      set(LLVM_XRAY_LDFLAGS ${LDFLAGS} CACHE STRING "Linker flags for LLVMXRay library")
-      set(LLVM_XRAY_LIBLIST ${LIBLIST} CACHE STRING "Library list for LLVMXRay")
+      string(REPLACE "\\" "/" LDFLAGS ${LDFLAGS})
+      string(REPLACE "\\" "/" LIBLIST ${LIBLIST})
+      set(LLVM_XRAY_LDFLAGS ${LDFLAGS} CACHE STRING "Linker flags for LLVMXRay library" FORCE)
+      set(LLVM_XRAY_LIBLIST ${LIBLIST} CACHE STRING "Library list for LLVMXRay" FORCE)
       set(COMPILER_RT_HAS_LLVMXRAY TRUE)
     endif()
 
@@ -268,8 +270,10 @@
       if (LIBLIST STREQUAL "")
         message(WARNING "testingsupport library not installed, some tests will be skipped")
       else()
-        set(LLVM_TESTINGSUPPORT_LDFLAGS ${LDFLAGS} CACHE STRING "Linker flags for LLVMTestingSupport library")
-        set(LLVM_TESTINGSUPPORT_LIBLIST ${LIBLIST} CACHE STRING "Library list for LLVMTestingSupport")
+        string(REPLACE "\\" "/" LDFLAGS ${LDFLAGS})
+        string(REPLACE "\\" "/" LDFLAGS ${LIBLIST})
+        set(LLVM_TESTINGSUPPORT_LDFLAGS ${LDFLAGS} CACHE STRING "Linker flags for LLVMTestingSupport library" FORCE)
+        set(LLVM_TESTINGSUPPORT_LIBLIST ${LIBLIST} CACHE STRING "Library list for LLVMTestingSupport" FORCE)
         set(COMPILER_RT_HAS_LLVMTESTINGSUPPORT TRUE)
       endif()
     endif()