add -Wextra for more warnings to example

non-stack warning (probably mcu driver) should be suppressed in the
board.mk

src/class/midi/midi_device.c

@@ -86,16 +86,19 @@ bool tud_midi_n_mounted (uint8_t itf)
 //--------------------------------------------------------------------+
 uint32_t tud_midi_n_available(uint8_t itf, uint8_t jack_id)
 {
+  (void) jack_id;
   return tu_fifo_count(&_midid_itf[itf].rx_ff);
 }
 
 uint32_t tud_midi_n_read(uint8_t itf, uint8_t jack_id, void* buffer, uint32_t bufsize)
 {
+  (void) jack_id;
   return tu_fifo_read_n(&_midid_itf[itf].rx_ff, buffer, bufsize);
 }
 
 void tud_midi_n_read_flush (uint8_t itf, uint8_t jack_id)
 {
+  (void) jack_id;
   tu_fifo_clear(&_midid_itf[itf].rx_ff);
 }
 
@@ -128,6 +131,8 @@ void midi_rx_done_cb(midid_interface_t* midi, uint8_t const* buffer, uint32_t bu
 
 static bool maybe_transmit(midid_interface_t* midi, uint8_t itf_index)
 {
+  (void) itf_index;
+
   // skip if previous transfer not complete
   TU_VERIFY( !usbd_edpt_busy(TUD_OPT_RHPORT, midi->ep_in) );
 
@@ -309,11 +314,15 @@ bool midid_open(uint8_t rhport, tusb_desc_interface_t const * p_interface_desc,
 
 bool midid_control_complete(uint8_t rhport, tusb_control_request_t const * p_request)
 {
-  return false;
+  (void) rhport;
+  (void) p_request;
+  return true;
 }
 
 bool midid_control_request(uint8_t rhport, tusb_control_request_t const * p_request)
 {
+  (void) rhport;
+
   //------------- Class Specific Request -------------//
   if (p_request->bmRequestType_bit.type != TUSB_REQ_TYPE_CLASS) return false;
 
@@ -322,6 +331,8 @@ bool midid_control_request(uint8_t rhport, tusb_control_request_t const * p_requ
 
 bool midid_xfer_cb(uint8_t rhport, uint8_t ep_addr, xfer_result_t result, uint32_t xferred_bytes)
 {
+  (void) result;
+
   // TODO Support multiple interfaces
   uint8_t const itf = 0;
   midid_interface_t* p_midi = &_midid_itf[itf];

src/osal/osal_none.h

@@ -145,6 +145,8 @@ typedef osal_queue_def_t* osal_queue_t;
 // lock queue by disable usb isr
 static inline void _osal_q_lock(osal_queue_t qhdl)
 {
+  (void) qhdl;
+
 #if TUSB_OPT_DEVICE_ENABLED
   if (qhdl->role == OPT_MODE_DEVICE) dcd_int_disable(TUD_OPT_RHPORT);
 #endif
@@ -157,6 +159,8 @@ static inline void _osal_q_lock(osal_queue_t qhdl)
 // unlock queue
 static inline void _osal_q_unlock(osal_queue_t qhdl)
 {
+  (void) qhdl;
+
 #if TUSB_OPT_DEVICE_ENABLED
   if (qhdl->role == OPT_MODE_DEVICE) dcd_int_enable(TUD_OPT_RHPORT);
 #endif

src/portable/st/stm32_fsdev/dcd_stm32_fsdev.c

@@ -103,17 +103,17 @@
 
 #include "tusb_option.h"
 
-#define STM32F1_FSDEV   ( \
-    defined(STM32F102x6) || defined(STM32F102xB) || \
+#if defined(STM32F102x6) || defined(STM32F102xB) || \
     defined(STM32F103x6) || defined(STM32F103xB) || \
-    defined(STM32F103xE) || defined(STM32F103xG)   \
-)
+    defined(STM32F103xE) || defined(STM32F103xG)
+#define STM32F1_FSDEV
+#endif
 
 #if (TUSB_OPT_DEVICE_ENABLED) && ( \
-      (CFG_TUSB_MCU == OPT_MCU_STM32F0                  ) || \
-      (CFG_TUSB_MCU == OPT_MCU_STM32F1 && STM32F1_FSDEV ) || \
-      (CFG_TUSB_MCU == OPT_MCU_STM32F3                  ) || \
-      (CFG_TUSB_MCU == OPT_MCU_STM32L0                  ) \
+      (CFG_TUSB_MCU == OPT_MCU_STM32F0                          ) || \
+      (CFG_TUSB_MCU == OPT_MCU_STM32F1 && defined(STM32F1_FSDEV)) || \
+      (CFG_TUSB_MCU == OPT_MCU_STM32F3                          ) || \
+      (CFG_TUSB_MCU == OPT_MCU_STM32L0                          ) \
     )
 
 // In order to reduce the dependance on HAL, we undefine this.

src/portable/st/stm32_fsdev/dcd_stm32_fsdev_pvt_st.h

@@ -52,7 +52,7 @@
   // 070RB:    2 x 16 bits/word memory     LPM Support, BCD Support
   // PMA dedicated to USB (no sharing with CAN)
 
-#elif STM32F1_FSDEV
+#elif defined(STM32F1_FSDEV)
   #include "stm32f1xx.h"
   #define PMA_LENGTH (512u)
   // NO internal Pull-ups

src/portable/st/synopsys/dcd_synopsys.c

@@ -27,19 +27,19 @@
 
 #include "tusb_option.h"
 
-#define STM32L4_SYNOPSYS    (                                                  \
-    defined (STM32L475xx) || defined (STM32L476xx) ||                          \
+#if defined (STM32L475xx) || defined (STM32L476xx) ||                          \
     defined (STM32L485xx) || defined (STM32L486xx) || defined (STM32L496xx) || \
     defined (STM32L4R5xx) || defined (STM32L4R7xx) || defined (STM32L4R9xx) || \
-    defined (STM32L4S5xx) || defined (STM32L4S7xx) || defined (STM32L4S9xx)    \
-)
+    defined (STM32L4S5xx) || defined (STM32L4S7xx) || defined (STM32L4S9xx)
+#define STM32L4_SYNOPSYS
+#endif
 
 #if TUSB_OPT_DEVICE_ENABLED && \
     ( CFG_TUSB_MCU == OPT_MCU_STM32F2 || \
       CFG_TUSB_MCU == OPT_MCU_STM32F4 || \
       CFG_TUSB_MCU == OPT_MCU_STM32F7 || \
       CFG_TUSB_MCU == OPT_MCU_STM32H7 || \
-      (CFG_TUSB_MCU == OPT_MCU_STM32L4 && STM32L4_SYNOPSYS) \
+      (CFG_TUSB_MCU == OPT_MCU_STM32L4 && defined(STM32L4_SYNOPSYS)) \
     )
 
 // TODO Support OTG_HS