diff --git a/openmp/runtime/cmake/LibompHandleFlags.cmake b/openmp/runtime/cmake/LibompHandleFlags.cmake
--- a/openmp/runtime/cmake/LibompHandleFlags.cmake
+++ b/openmp/runtime/cmake/LibompHandleFlags.cmake
@@ -80,7 +80,6 @@
 # Assembler flags
 function(libomp_get_asmflags asmflags)
   set(asmflags_local)
-  libomp_append(asmflags_local "-x assembler-with-cpp" LIBOMP_HAVE_X_ASSEMBLER_WITH_CPP_FLAG)
   # Architectural assembler flags
   if(${IA32})
     if(CMAKE_SIZEOF_VOID_P EQUAL 8)
diff --git a/openmp/runtime/cmake/config-ix.cmake b/openmp/runtime/cmake/config-ix.cmake
--- a/openmp/runtime/cmake/config-ix.cmake
+++ b/openmp/runtime/cmake/config-ix.cmake
@@ -96,11 +96,6 @@
       )
     endforeach()
   endforeach()
-else()
-  # It is difficult to create a dummy assembly file that compiles into an
-  # executable for every architecture and then check the C compiler to
-  # see if -x assembler-with-cpp exists and works, so we assume it does for non-Windows.
-  set(LIBOMP_HAVE_X_ASSEMBLER_WITH_CPP_FLAG TRUE)
 endif()
 if(${LIBOMP_FORTRAN_MODULES})
   libomp_check_fortran_flag(-m32 LIBOMP_HAVE_M32_FORTRAN_FLAG)