diff --git a/flang/lib/Decimal/CMakeLists.txt b/flang/lib/Decimal/CMakeLists.txt
--- a/flang/lib/Decimal/CMakeLists.txt
+++ b/flang/lib/Decimal/CMakeLists.txt
@@ -24,6 +24,7 @@
 
   include(AddLLVM)
   include(AddFlang)
+  include(HandleLLVMOptions)
 
   include(TestBigEndian)
   test_big_endian(IS_BIGENDIAN)
diff --git a/flang/runtime/CMakeLists.txt b/flang/runtime/CMakeLists.txt
--- a/flang/runtime/CMakeLists.txt
+++ b/flang/runtime/CMakeLists.txt
@@ -39,6 +39,7 @@
 
   include(AddLLVM)
   include(AddFlang)
+  include(HandleLLVMOptions)
 
   include(TestBigEndian)
   test_big_endian(IS_BIGENDIAN)