4 files changed, 14 insertions, 11 deletions
diff --git a/tmk_core/common/action.c b/tmk_core/common/action.c
index 19c3569d55..74db245c12 100644
--- a/tmk_core/common/action.c
+++ b/tmk_core/common/action.c
@@ -775,11 +775,12 @@ void register_code(uint8_t code) {
             add_mods(MOD_BIT(code));
             send_keyboard_report();
         }
+#ifdef EXTRAKEY_ENABLE
     else if
         IS_SYSTEM(code) { host_system_send(KEYCODE2SYSTEM(code)); }
     else if
         IS_CONSUMER(code) { host_consumer_send(KEYCODE2CONSUMER(code)); }
-
+#endif
 #ifdef MOUSEKEY_ENABLE
     else if
         IS_MOUSEKEY(code) {
diff --git a/tmk_core/common/action_layer.h b/tmk_core/common/action_layer.h
index b8562f5a46..c283d26232 100644
--- a/tmk_core/common/action_layer.h
+++ b/tmk_core/common/action_layer.h
@@ -82,13 +82,13 @@ void layer_xor(layer_state_t state);
 
 #    define layer_debug()
 #    define layer_clear()
-#    define layer_move(layer)
-#    define layer_on(layer)
-#    define layer_off(layer)
-#    define layer_invert(layer)
-#    define layer_or(state)
-#    define layer_and(state)
-#    define layer_xor(state)
+#    define layer_move(layer) (void)layer
+#    define layer_on(layer) (void)layer
+#    define layer_off(layer) (void)layer
+#    define layer_invert(layer) (void)layer
+#    define layer_or(state) (void)state
+#    define layer_and(state) (void)state
+#    define layer_xor(state) (void)state
 #endif
 
 layer_state_t layer_state_set_user(layer_state_t state);
diff --git a/tmk_core/common/util.c b/tmk_core/common/util.c
index f4f018de8d..861cca0054 100644
--- a/tmk_core/common/util.c
+++ b/tmk_core/common/util.c
@@ -18,7 +18,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "util.h"
 
 // bit population - return number of on-bit
-uint8_t bitpop(uint8_t bits) {
+__attribute__((noinline)) uint8_t bitpop(uint8_t bits) {
     uint8_t c;
     for (c = 0; bits; c++) bits &= bits - 1;
     return c;
@@ -42,7 +42,7 @@ uint8_t bitpop32(uint32_t bits) {
 
 // most significant on-bit - return highest location of on-bit
 // NOTE: return 0 when bit0 is on or all bits are off
-uint8_t biton(uint8_t bits) {
+__attribute__((noinline)) uint8_t biton(uint8_t bits) {
     uint8_t n = 0;
     if (bits >> 4) {
         bits >>= 4;
@@ -105,7 +105,7 @@ uint8_t biton32(uint32_t bits) {
     return n;
 }
 
-uint8_t bitrev(uint8_t bits) {
+__attribute__((noinline)) uint8_t bitrev(uint8_t bits) {
     bits = (bits & 0x0f) << 4 | (bits & 0xf0) >> 4;
     bits = (bits & 0b00110011) << 2 | (bits & 0b11001100) >> 2;
     bits = (bits & 0b01010101) << 1 | (bits & 0b10101010) >> 1;
diff --git a/tmk_core/protocol/vusb/vusb.c b/tmk_core/protocol/vusb/vusb.c
index bb84ec968f..867ffb33f2 100644
--- a/tmk_core/protocol/vusb/vusb.c
+++ b/tmk_core/protocol/vusb/vusb.c
@@ -159,10 +159,12 @@ typedef struct {
 } __attribute__((packed)) vusb_mouse_report_t;
 
 static void send_mouse(report_mouse_t *report) {
+#if defined(MOUSE_ENABLE)
     vusb_mouse_report_t r = {.report_id = REPORT_ID_MOUSE, .report = *report};
     if (usbInterruptIsReady3()) {
         usbSetInterrupt3((void *)&r, sizeof(vusb_mouse_report_t));
     }
+#endif
 }
 
 #ifdef EXTRAKEY_ENABLE