diff --git a/compiler-rt/cmake/Modules/CompilerRTDarwinUtils.cmake b/compiler-rt/cmake/Modules/CompilerRTDarwinUtils.cmake
--- a/compiler-rt/cmake/Modules/CompilerRTDarwinUtils.cmake
+++ b/compiler-rt/cmake/Modules/CompilerRTDarwinUtils.cmake
@@ -44,8 +44,11 @@
 endfunction()
 
 function(find_darwin_sdk_version var sdk_name)
-  # We deliberately don't cache the result here because
-  # CMake's caching causes too many problems.
+  set(DARWIN_${sdk_name}_CACHED_SDKVERSION "" CACHE STRING "Darwin SDK version for SDK ${sdk_name}.")
+  if(DARWIN_${sdk_name}_CACHED_SDKVERSION)
+    set(${var} ${DARWIN_${sdk_name}_CACHED_SDKVERSION} PARENT_SCOPE)
+    return()
+  endif()
   set(result_process 1)
   if(NOT DARWIN_PREFER_PUBLIC_SDK)
     # Let's first try the internal SDK, otherwise use the public SDK.
@@ -76,6 +79,7 @@
       "Reported SDK version \"${var_internal}\" does not look like a version")
   endif()
   set(${var} ${var_internal} PARENT_SCOPE)
+  set(DARWIN_${sdk_name}_CACHED_SDKVERSION ${var_internal} CACHE STRING "Darwin SDK version for SDK ${sdk_name}." FORCE)
 endfunction()
 
 # There isn't a clear mapping of what architectures are supported with a given