Strip out features to allow minimum firmware sizes

quantum/keymap_common.c

@@ -51,17 +51,23 @@ action_t action_for_key(uint8_t layer, keypos_t key) {
     action_t action = {};
     uint8_t  action_layer, when, mod;
 
+    (void)action_layer;
+    (void)when;
+    (void)mod;
+
     switch (keycode) {
         case KC_A ... KC_EXSEL:
         case KC_LCTRL ... KC_RGUI:
             action.code = ACTION_KEY(keycode);
             break;
+#ifdef EXTRAKEY_ENABLE
         case KC_SYSTEM_POWER ... KC_SYSTEM_WAKE:
             action.code = ACTION_USAGE_SYSTEM(KEYCODE2SYSTEM(keycode));
             break;
         case KC_AUDIO_MUTE ... KC_BRIGHTNESS_DOWN:
             action.code = ACTION_USAGE_CONSUMER(KEYCODE2CONSUMER(keycode));
             break;
+#endif
 #ifdef MOUSEKEY_ENABLE
         case KC_MS_UP ... KC_MS_ACCEL2:
             action.code = ACTION_MOUSEKEY(keycode);
@@ -93,6 +99,7 @@ action_t action_for_key(uint8_t layer, keypos_t key) {
                 action.code = ACTION_MACRO(keycode & 0xFF);
             break;
 #endif
+#ifndef NO_ACTION_LAYER
         case QK_LAYER_TAP ... QK_LAYER_TAP_MAX:
             action.code = ACTION_LAYER_TAP_KEY((keycode >> 0x8) & 0xF, keycode & 0xFF);
             break;
@@ -117,6 +124,8 @@ action_t action_for_key(uint8_t layer, keypos_t key) {
             action_layer = keycode & 0xFF;
             action.code  = ACTION_LAYER_TOGGLE(action_layer);
             break;
+#endif
+#ifndef NO_ACTION_ONESHOT
         case QK_ONE_SHOT_LAYER ... QK_ONE_SHOT_LAYER_MAX:;
             // OSL(action_layer) - One-shot action_layer
             action_layer = keycode & 0xFF;
@@ -127,6 +136,8 @@ action_t action_for_key(uint8_t layer, keypos_t key) {
             mod         = mod_config(keycode & 0xFF);
             action.code = ACTION_MODS_ONESHOT(mod);
             break;
+#endif
+#ifndef NO_ACTION_LAYER
         case QK_LAYER_TAP_TOGGLE ... QK_LAYER_TAP_TOGGLE_MAX:
             action.code = ACTION_LAYER_TAP_TOGGLE(keycode & 0xFF);
             break;
@@ -135,10 +146,13 @@ action_t action_for_key(uint8_t layer, keypos_t key) {
             action_layer = (keycode >> 4) & 0xF;
             action.code  = ACTION_LAYER_MODS(action_layer, mod);
             break;
+#endif
+#ifndef NO_ACTION_TAPPING
         case QK_MOD_TAP ... QK_MOD_TAP_MAX:
             mod         = mod_config((keycode >> 0x8) & 0x1F);
             action.code = ACTION_MODS_TAP_KEY(mod, keycode & 0xFF);
             break;
+#endif
 #ifdef SWAP_HANDS_ENABLE
         case QK_SWAP_HANDS ... QK_SWAP_HANDS_MAX:
             action.code = ACTION(ACT_SWAP_HANDS, keycode & 0xff);

quantum/quantum.c

@@ -288,9 +288,11 @@ bool process_record_quantum(keyrecord_t *record) {
 
     if (record->event.pressed) {
         switch (keycode) {
+#ifndef NO_RESET
             case RESET:
                 reset_keyboard();
                 return false;
+#endif
 #ifndef NO_DEBUG
             case DEBUG:
                 debug_enable ^= 1;

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) {

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);

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;

tmk_core/protocol/vusb/vusb.c

@@ -160,10 +160,12 @@ 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