warning: invalid conversion from 'void*' to 'udc_data*

[mondalaci]

I get a bunch of warnings like this during the build:

/home/laci/projects/firmware-uhk80/nrfconnect/zephyr/include/zephyr/drivers/usb/udc.h:302:38: warning: invalid conversion from 'void*' to 'udc_data*' [-fpermissive]
  302 |         struct udc_data *data = dev->data;
      |                                 ~~~~~^~~~
      |                                      |
      |                                      void*

@benedekkupper I want to clean up the build output. How can we resolve these warnings, preferably without globally disabling warnings that can be useful?

[mondalaci]

This should be the full list:

/home/laci/projects/firmware-uhk80/nrfconnect/zephyr/include/zephyr/drivers/usb/udc.h: In function 'bool udc_is_initialized(const device*)':
/home/laci/projects/firmware-uhk80/nrfconnect/zephyr/include/zephyr/drivers/usb/udc.h:302:38: warning: invalid conversion from 'void*' to 'udc_data*' [-fpermissive]
  302 |         struct udc_data *data = dev->data;
      |                                 ~~~~~^~~~
      |                                      |
      |                                      void*
/home/laci/projects/firmware-uhk80/nrfconnect/zephyr/include/zephyr/drivers/usb/udc.h: In function 'bool udc_is_enabled(const device*)':
/home/laci/projects/firmware-uhk80/nrfconnect/zephyr/include/zephyr/drivers/usb/udc.h:316:38: warning: invalid conversion from 'void*' to 'udc_data*' [-fpermissive]
  316 |         struct udc_data *data = dev->data;
      |                                 ~~~~~^~~~
      |                                      |
      |                                      void*
/home/laci/projects/firmware-uhk80/nrfconnect/zephyr/include/zephyr/drivers/usb/udc.h: In function 'bool udc_is_suspended(const device*)':
/home/laci/projects/firmware-uhk80/nrfconnect/zephyr/include/zephyr/drivers/usb/udc.h:330:38: warning: invalid conversion from 'void*' to 'udc_data*' [-fpermissive]
  330 |         struct udc_data *data = dev->data;
      |                                 ~~~~~^~~~
      |                                      |
      |                                      void*
/home/laci/projects/firmware-uhk80/nrfconnect/zephyr/include/zephyr/drivers/usb/udc.h: In function 'udc_device_caps udc_caps(const device*)':
/home/laci/projects/firmware-uhk80/nrfconnect/zephyr/include/zephyr/drivers/usb/udc.h:403:38: warning: invalid conversion from 'void*' to 'udc_data*' [-fpermissive]
  403 |         struct udc_data *data = dev->data;
      |                                 ~~~~~^~~~
      |                                      |
      |                                      void*
/home/laci/projects/firmware-uhk80/nrfconnect/zephyr/include/zephyr/drivers/usb/udc.h: In function 'int udc_set_address(const device*, uint8_t)':
/home/laci/projects/firmware-uhk80/nrfconnect/zephyr/include/zephyr/drivers/usb/udc.h:433:42: warning: invalid conversion from 'const void*' to 'const udc_api*' [-fpermissive]
  433 |         const struct udc_api *api = dev->api;
      |                                     ~~~~~^~~
      |                                          |
      |                                          const void*
/home/laci/projects/firmware-uhk80/nrfconnect/zephyr/include/zephyr/drivers/usb/udc.h: In function 'int udc_host_wakeup(const device*)':
/home/laci/projects/firmware-uhk80/nrfconnect/zephyr/include/zephyr/drivers/usb/udc.h:459:42: warning: invalid conversion from 'const void*' to 'const udc_api*' [-fpermissive]
  459 |         const struct udc_api *api = dev->api;
      |                                     ~~~~~^~~
      |                                          |
      |                                          const void*

[benedekkupper]

This is not fixable on our side: https://stackoverflow.com/questions/19214645/how-to-suppress-warnings-for-void-to-foo-conversions-reduced-from-errors

I have sent a PR to zephyr: zephyrproject-rtos/zephyr#69490