warning: 'flash_get_size' declared 'static' but never defined

[ofirshe]

Hi,

After rebasing my Zephyr repository to the latest commit (305ceba), I'm encountering the following compilation warning when building for the mimxrt1060_evk target board:

[125/377] Building C object zephyr/CMakeFiles/zephyr.dir/subsys/storage/flash_map/flash_map_layout.c.obj
In file included from C:/Users/ofirs/bsp/zephyr/subsys/storage/flash_map/flash_map_layout.c:17:
C:/Users/ofirs/bsp/zephyr/include/zephyr/drivers/flash.h:350:15: warning: 'flash_get_size' declared 'static' but never defined [-Wunused-function]
  350 | __syscall int flash_get_size(const struct device *dev, uint64_t *size);
      |               ^~~~~~~~~~~~~~
[128/377] Building C object zephyr/CMakeFiles/zephyr.dir/subsys/storage/flash_map/flash_map.c.obj
In file included from C:/Users/ofirs/bsp/zephyr/subsys/storage/flash_map/flash_map.c:19:
C:/Users/ofirs/bsp/zephyr/include/zephyr/drivers/flash.h:350:15: warning: 'flash_get_size' declared 'static' but never defined [-Wunused-function]
  350 | __syscall int flash_get_size(const struct device *dev, uint64_t *size);
      |               ^~~~~~~~~~~~~~
[131/377] Building C object zephyr/CMakeFiles/zephyr.dir/drivers/flash/flash_util.c.obj
In file included from C:/Users/ofirs/bsp/zephyr/drivers/flash/flash_util.c:16:
C:/Users/ofirs/bsp/zephyr/include/zephyr/drivers/flash.h:350:15: warning: 'flash_get_size' declared 'static' but never defined [-Wunused-function]
  350 | __syscall int flash_get_size(const struct device *dev, uint64_t *size);
      |               ^~~~~~~~~~~~~~
[240/377] Building C object zephyr/drivers/flash/CMakeFiles/drivers__flash.dir/flash_page_layout.c.obj
In file included from C:/Users/ofirs/bsp/zephyr/drivers/flash/flash_page_layout.c:9:
C:/Users/ofirs/bsp/zephyr/include/zephyr/drivers/flash.h:350:15: warning: 'flash_get_size' declared 'static' but never defined [-Wunused-function]
  350 | __syscall int flash_get_size(const struct device *dev, uint64_t *size);
      |               ^~~~~~~~~~~~~~
[254/377] Building C object zephyr/drivers/flash/CMakeFiles/drivers__flash.dir/flash_mcux_flexspi_nor.c.obj
In file included from C:/Users/ofirs/bsp/zephyr/drivers/flash/flash_mcux_flexspi_nor.c:10:
C:/Users/ofirs/bsp/zephyr/include/zephyr/drivers/flash.h:350:15: warning: 'flash_get_size' declared 'static' but never defined [-Wunused-function]
  350 | __syscall int flash_get_size(const struct device *dev, uint64_t *size);
      |               ^~~~~~~~~~~~~~

I assume this issue might be related to changes introduced in commit 13fa233 by @de-nordic.

Am I missing any configuration or something else to resolve this warning? I enable CONFIG_FLASH=y and CONFIG_FLASH_MAP=y in my app.

Best Regards.

[de-nordic]

Hi.
Rebuild syscalls in your build. It seems that you are picking the function declaration but definition is missing.

The function is in Flash API. If you take a look at include/zephyr/drivers/flash.h, you will notice that most calls there have _syscall prototype and z_impl implementation.

There will be second flash.h file in your build that will have the definition.

[ofirshe]

@de-nordic Correct, my mistake.