diff --git a/gcc/config/sw_64/sw_64.opt b/gcc/config/sw_64/sw_64.opt
index c818dff40..22d0cdd5d 100644
--- a/gcc/config/sw_64/sw_64.opt
+++ b/gcc/config/sw_64/sw_64.opt
@@ -21,6 +21,9 @@ msw-use-32align
 C C++ Fortran LTO Driver Target Mask(SW_32ALIGN) Save
 Use or not use 32align.
 
+TargetVariable
+uint64_t sw_64_dummy_target = 0
+
 fsw-sf-cmpsel
 Target Var(flag_sw_sf_cmpsel) Init(0)
 use or not use SF cmp/br/selcet instructions.