diff --git a/compiler-rt/cmake/Modules/HandleCompilerRT.cmake b/compiler-rt/cmake/Modules/HandleCompilerRT.cmake
index 855d0ff9df1c..364cdccc84db 100644
--- a/compiler-rt/cmake/Modules/HandleCompilerRT.cmake
+++ b/compiler-rt/cmake/Modules/HandleCompilerRT.cmake
@@ -4,6 +4,9 @@ function(find_compiler_rt_library name variable)
   if (CMAKE_CXX_COMPILER_ID MATCHES Clang AND CMAKE_CXX_COMPILER_TARGET)
     list(APPEND CLANG_COMMAND "--target=${CMAKE_CXX_COMPILER_TARGET}")
   endif()
+  get_property(SANITIZER_CXX_FLAGS CACHE CMAKE_CXX_FLAGS PROPERTY VALUE)
+  string(REPLACE " " ";" SANITIZER_CXX_FLAGS "${SANITIZER_CXX_FLAGS}")
+  list(APPEND CLANG_COMMAND ${SANITIZER_CXX_FLAGS})
   execute_process(
       COMMAND ${CLANG_COMMAND}
       RESULT_VARIABLE HAD_ERROR
diff --git a/libcxx/cmake/Modules/HandleCompilerRT.cmake b/libcxx/cmake/Modules/HandleCompilerRT.cmake
index 2e0e69e5e085..1ce256574941 100644
--- a/libcxx/cmake/Modules/HandleCompilerRT.cmake
+++ b/libcxx/cmake/Modules/HandleCompilerRT.cmake
@@ -8,6 +8,9 @@ function(find_compiler_rt_library name dest)
   if (CMAKE_CXX_COMPILER_ID MATCHES Clang AND CMAKE_CXX_COMPILER_TARGET)
     list(APPEND CLANG_COMMAND "--target=${CMAKE_CXX_COMPILER_TARGET}")
   endif()
+  get_property(LIBCXX_CXX_FLAGS CACHE CMAKE_CXX_FLAGS PROPERTY VALUE)
+  string(REPLACE " " ";" LIBCXX_CXX_FLAGS "${LIBCXX_CXX_FLAGS}")
+  list(APPEND CLANG_COMMAND ${LIBCXX_CXX_FLAGS})
   execute_process(
       COMMAND ${CLANG_COMMAND}
       RESULT_VARIABLE HAD_ERROR
diff --git a/libcxxabi/cmake/Modules/HandleCompilerRT.cmake b/libcxxabi/cmake/Modules/HandleCompilerRT.cmake
index 945de5850589..1f953276df00 100644
--- a/libcxxabi/cmake/Modules/HandleCompilerRT.cmake
+++ b/libcxxabi/cmake/Modules/HandleCompilerRT.cmake
@@ -8,6 +8,9 @@ function(find_compiler_rt_library name dest)
   if (CMAKE_CXX_COMPILER_ID MATCHES Clang AND CMAKE_CXX_COMPILER_TARGET)
     list(APPEND CLANG_COMMAND "--target=${CMAKE_CXX_COMPILER_TARGET}")
   endif()
+  get_property(LIBCXXABI_CXX_FLAGS CACHE CMAKE_CXX_FLAGS PROPERTY VALUE)
+  string(REPLACE " " ";" LIBCXXABI_CXX_FLAGS "${LIBCXXABI_CXX_FLAGS}")
+  list(APPEND CLANG_COMMAND ${LIBCXXABI_CXX_FLAGS})
   execute_process(
       COMMAND ${CLANG_COMMAND}
       RESULT_VARIABLE HAD_ERROR
diff --git a/libunwind/cmake/Modules/HandleCompilerRT.cmake b/libunwind/cmake/Modules/HandleCompilerRT.cmake
index 275243a1bc6b..77168e599466 100644
--- a/libunwind/cmake/Modules/HandleCompilerRT.cmake
+++ b/libunwind/cmake/Modules/HandleCompilerRT.cmake
@@ -8,6 +8,9 @@ function(find_compiler_rt_library name dest)
   if (CMAKE_CXX_COMPILER_ID MATCHES Clang AND CMAKE_CXX_COMPILER_TARGET)
     list(APPEND CLANG_COMMAND "--target=${CMAKE_CXX_COMPILER_TARGET}")
   endif()
+  get_property(LIBUNWIND_CXX_FLAGS CACHE CMAKE_CXX_FLAGS PROPERTY VALUE)
+  string(REPLACE " " ";" LIBUNWIND_CXX_FLAGS "${LIBUNWIND_CXX_FLAGS}")
+  list(APPEND CLANG_COMMAND ${LIBUNWIND_CXX_FLAGS})
   execute_process(
       COMMAND ${CLANG_COMMAND}
       RESULT_VARIABLE HAD_ERROR