Fix undefined reference errors with avr-gcc 7.1

keyboards/ergodox/ez/ez.c

@@ -1,6 +1,30 @@
 #include "ez.h"
 #include "i2cmaster.h"
 
+
+extern inline void ergodox_board_led_on(void);
+extern inline void ergodox_right_led_1_on(void);
+extern inline void ergodox_right_led_2_on(void);
+extern inline void ergodox_right_led_3_on(void);
+extern inline void ergodox_right_led_on(uint8_t led);
+
+extern inline void ergodox_board_led_off(void);
+extern inline void ergodox_right_led_1_off(void);
+extern inline void ergodox_right_led_2_off(void);
+extern inline void ergodox_right_led_3_off(void);
+extern inline void ergodox_right_led_off(uint8_t led);
+
+extern inline void ergodox_led_all_on(void);
+extern inline void ergodox_led_all_off(void);
+
+extern inline void ergodox_right_led_1_set(uint8_t n);
+extern inline void ergodox_right_led_2_set(uint8_t n);
+extern inline void ergodox_right_led_3_set(uint8_t n);
+extern inline void ergodox_right_led_set(uint8_t led, uint8_t n);
+
+extern inline void ergodox_led_all_set(uint8_t n);
+
+
 bool i2c_initialized = 0;
 uint8_t mcp23018_status = 0x20;
 
@@ -57,7 +81,7 @@ uint8_t init_mcp23018(void) {
     // cli();
     if (i2c_initialized == 0) {
         i2c_init();  // on pins D(1,0)
-        i2c_initialized++;
+        i2c_initialized = true;
         _delay_ms(1000);
     }
 

keyboards/gh60/gh60.c

@@ -1,5 +1,19 @@
 #include "gh60.h"
 
+
+extern inline void gh60_caps_led_on(void);
+extern inline void gh60_poker_leds_on(void);
+extern inline void gh60_fn_led_on(void);
+extern inline void gh60_esc_led_on(void);
+extern inline void gh60_wasd_leds_on(void);
+
+extern inline void gh60_caps_led_off(void);
+extern inline void gh60_poker_leds_off(void);
+extern inline void gh60_fn_led_off(void);
+extern inline void gh60_esc_led_off(void);
+extern inline void gh60_wasd_leds_off(void);
+
+
 void led_set_kb(uint8_t usb_led) {
 	// put your keyboard LED indicator (ex: Caps Lock LED) toggling code here
 

keyboards/pegasushoof/pegasushoof.c

@@ -17,6 +17,14 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #include "pegasushoof.h"
 
+
+extern inline void ph_caps_led_on(void);
+extern inline void ph_caps_led_off(void);
+
+extern inline void ph_sclk_led_on(void);
+extern inline void ph_sclk_led_off(void);
+
+
 __attribute__ ((weak))
 void matrix_init_user(void) {
 };

keyboards/xd60/xd60.c

@@ -1,5 +1,13 @@
 #include "xd60.h"
 
+
+extern inline void xd60_caps_led_on(void);
+extern inline void xd60_bl_led_on(void);
+
+extern inline void xd60_caps_led_off(void);
+extern inline void xd60_bl_led_off(void);
+
+
 void led_set_kb(uint8_t usb_led) {
 	// put your keyboard LED indicator (ex: Caps Lock LED) toggling code here