diff --git a/target-xtensa/core-dc232b.c b/target-xtensa/core-dc232b.c
index c51e11e6d7392fb486fc3dcdb6e73baa29559a58..a3b914bad4a77092c6712b0c6a0e18081920cee0 100644
--- a/target-xtensa/core-dc232b.c
+++ b/target-xtensa/core-dc232b.c
@@ -33,7 +33,7 @@
 #include "core-dc232b/core-isa.h"
 #include "overlay_tool.h"
 
-static const XtensaConfig dc232b = {
+static const XtensaConfig dc232b __attribute__((unused)) = {
     .name = "dc232b",
     .gdb_regmap = {
         .num_regs = 120,
diff --git a/target-xtensa/core-dc233c.c b/target-xtensa/core-dc233c.c
index 42dd64f031df7e73dfaee92ec74ba8e9f097d209..ac745d106ff3ae76757acdb958f9cbbea3b77bbf 100644
--- a/target-xtensa/core-dc233c.c
+++ b/target-xtensa/core-dc233c.c
@@ -34,7 +34,7 @@
 #include "core-dc233c/core-isa.h"
 #include "overlay_tool.h"
 
-static const XtensaConfig dc233c = {
+static const XtensaConfig dc233c __attribute__((unused)) = {
     .name = "dc233c",
     .gdb_regmap = {
         .num_regs = 121,
diff --git a/target-xtensa/core-fsf.c b/target-xtensa/core-fsf.c
index 6859bee062cc2ea45e505fcd3336d39b281eda5d..cfcc840255ee850e347695426152b6c4e3099d6f 100644
--- a/target-xtensa/core-fsf.c
+++ b/target-xtensa/core-fsf.c
@@ -33,7 +33,7 @@
 #include "core-fsf/core-isa.h"
 #include "overlay_tool.h"
 
-static const XtensaConfig fsf = {
+static const XtensaConfig fsf __attribute__((unused)) = {
     .name = "fsf",
     /* GDB for this core is not supported currently */
     .clock_freq_khz = 10000,