rework suppress_tinyusb_warnings

* gcc 9.2.1 has some spurious -Wconversion warnings
* cmake 3.18 and above require set_target_properties to be added from the target directory (so added it to all examples)
* fixed a few warnings in a couple of examples

examples/device/cdc_dual_ports/src/main.c

@@ -60,12 +60,12 @@ static void echo_serial_port(uint8_t itf, uint8_t buf[], uint32_t count)
     if (itf == 0)
     {
       // echo back 1st port as lower case
-      if (isupper(buf[i])) buf[i] += 'a' - 'A';
+      if (isupper(buf[i])) buf[i] = (uint8_t) (buf[i] + 'a' - 'A');
     }
     else
     {
       // echo back 2nd port as upper case
-      if (islower(buf[i])) buf[i] -= 'a' - 'A';
+      if (islower(buf[i])) buf[i] = (uint8_t) (buf[i] - 'a' - 'A');
     }
 
     tud_cdc_n_write_char(itf, buf[i]);

examples/device/hid_composite/src/main.c

@@ -230,7 +230,7 @@ void tud_hid_report_complete_cb(uint8_t instance, uint8_t const* report, uint8_t
   (void) instance;
   (void) len;
 
-  uint8_t next_report_id = report[0] + 1;
+  uint8_t next_report_id = (uint8_t)(report[0] + 1);
 
   if (next_report_id < REPORT_ID_COUNT)
   {

hw/bsp/rp2040/family.cmake

@@ -150,11 +150,13 @@ if (NOT TARGET _rp2040_family_inclusion_marker)
 	function(family_configure_device_example TARGET)
 		family_configure_target(${TARGET})
 		target_link_libraries(${TARGET} PUBLIC pico_stdlib tinyusb_device)
+		suppress_tinyusb_warnings()
 	endfunction()
 
 	function(family_configure_host_example TARGET)
 		family_configure_target(${TARGET})
 		target_link_libraries(${TARGET} PUBLIC pico_stdlib tinyusb_host)
+		suppress_tinyusb_warnings()
 	endfunction()
 
 	function(family_add_pico_pio_usb TARGET)
@@ -165,6 +167,7 @@ if (NOT TARGET _rp2040_family_inclusion_marker)
 		family_configure_target(${TARGET})
 		# require tinyusb_pico_pio_usb
 		target_link_libraries(${TARGET} PUBLIC pico_stdlib tinyusb_device tinyusb_host tinyusb_pico_pio_usb )
+		suppress_tinyusb_warnings()
 	endfunction()
 
 	function(check_and_add_pico_pio_usb_support)
@@ -232,25 +235,34 @@ if (NOT TARGET _rp2040_family_inclusion_marker)
 
 	# This method must be called from the project scope to suppress known warnings in TinyUSB source files
 	function(suppress_tinyusb_warnings)
-		set_source_files_properties(
-					${PICO_TINYUSB_PATH}/src/device/usbd.c
-					PROPERTIES
-					COMPILE_FLAGS "-Wno-conversion")
-		set_source_files_properties(
-					${PICO_TINYUSB_PATH}/src/device/usbd_control.c
-					PROPERTIES
-					COMPILE_FLAGS "-Wno-conversion")
-		set_source_files_properties(
-					${PICO_TINYUSB_PATH}/src/class/cdc/cdc_device.c
+		# some of these are pretty silly warnings only occurring in some older GCC versions
+		set(CONVERSION_WARNING_FILES
+				${PICO_TINYUSB_PATH}/src/tusb.c
+				${PICO_TINYUSB_PATH}/src/common/tusb_fifo.c
+				${PICO_TINYUSB_PATH}/src/device/usbd.c
+				${PICO_TINYUSB_PATH}/src/device/usbd_control.c
+				${PICO_TINYUSB_PATH}/src/host/usbh.c
+				${PICO_TINYUSB_PATH}/src/class/cdc/cdc_device.c
+				${PICO_TINYUSB_PATH}/src/class/cdc/cdc_host.c
+				${PICO_TINYUSB_PATH}/src/class/hid/hid_device.c
+				${PICO_TINYUSB_PATH}/src/class/hid/hid_host.c
+				${PICO_TINYUSB_PATH}/src/class/audio/audio_device.c
+				${PICO_TINYUSB_PATH}/src/class/dfu/dfu_device.c
+				${PICO_TINYUSB_PATH}/src/class/dfu/dfu_rt_device.c
+				${PICO_TINYUSB_PATH}/src/class/midi/midi_device.c
+				${PICO_TINYUSB_PATH}/src/class/usbtmc/usbtmc_device.c
+				${PICO_TINYUSB_PATH}/src/portable/raspberrypi/rp2040/hcd_rp2040.c
+				)
+		foreach(SOURCE_FILE IN LISTS CONVERSION_WARNING_FILES)
+			set_source_files_properties(
+					${SOURCE_FILE}
 					PROPERTIES
 					COMPILE_FLAGS "-Wno-conversion")
+		endforeach()
 		set_source_files_properties(
-					${PICO_TINYUSB_PATH}/src/common/tusb_fifo.c
-					PROPERTIES
-					COMPILE_FLAGS "-Wno-conversion")
-		set_source_files_properties(
-					${PICO_TINYUSB_PATH}/src/tusb.c
-					PROPERTIES
-					COMPILE_FLAGS "-Wno-conversion")
+				${PICO_TINYUSB_PATH}/src/portable/raspberrypi/rp2040/rp2040_usb.c
+				PROPERTIES
+				COMPILE_FLAGS "-Wno-stringop-overflow -Wno-array-bounds"
+		)
 	endfunction()
 endif()