Index: cmake/config-ix.cmake
===================================================================
--- cmake/config-ix.cmake
+++ cmake/config-ix.cmake
@@ -76,15 +76,6 @@
   include(CheckLibcxxAtomic)
 endif()
 
-# Check compiler flags
-
-check_cxx_compiler_flag(/WX                     LIBCXX_HAS_WX_FLAG)
-check_cxx_compiler_flag(/WX-                    LIBCXX_HAS_NO_WX_FLAG)
-check_cxx_compiler_flag(/EHsc                   LIBCXX_HAS_EHSC_FLAG)
-check_cxx_compiler_flag(/EHs-                   LIBCXX_HAS_NO_EHS_FLAG)
-check_cxx_compiler_flag(/EHa-                   LIBCXX_HAS_NO_EHA_FLAG)
-check_cxx_compiler_flag(/GR-                    LIBCXX_HAS_NO_GR_FLAG)
-
 # Check libraries
 if(WIN32 AND NOT MINGW)
   # TODO(compnerd) do we want to support an emulation layer that allows for the