I had some problems linking some company code and the supplied STM32 CubeIDE code together, the linker was complaining about undefined references to ST's HAL_RTC and HAL_RTCEx code:

ld: home/.../foobar.o: in function `foobar_myFunc': /home/.../foobar.c: undefined reference to `HAL_RTCEx_BKUPWrite'
ld: /home/.../foobar.o: in function `rtcHal_getUnixTime': /home/.../foobar.c:902: undefined reference to `HAL_RTC_GetTime'
ld: /home/.../foobar.c:921: undefined reference to `HAL_RTC_GetDate'
ld: /home/.../foobar.c:929: undefined reference to `HAL_RTC_GetTime'
collect2: error: ld returned 1 exit status

I had some problems linking some company code and the supplied STM32 CubeIDE code together, the linker was complaining about undefined references to ST's HAL_RTC and HAL_RTCEx code:

ld: home/.../foobar.o: in function `foobar_myFunc': /home/.../foobar.c: undefined reference to `HAL_RTCEx_BKUPWrite'
ld: /home/.../foobar.o: in function `rtcHal_getUnixTime': /home/.../foobar.c:902: undefined reference to `HAL_RTC_GetTime'
ld: /home/.../foobar.c:921: undefined reference to `HAL_RTC_GetDate'
ld: /home/.../foobar.c:929: undefined reference to `HAL_RTC_GetTime'
collect2: error: ld returned 1 exit status

• linker
• stm32
• ld
• stm32cubeide

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1 Answer 1

Sorted by: Reset to default 1

The solution was simply that the entire file stm32f7xx_hal_rtc_ex.c and stm32f7xx_hal_rtc.c are wrapped in an #ifdef HAL_RTC_MODULE_ENABLED, and I hadn't defined that macro.

If you uncomment the HAL_RTC_MODULE_ENABLED line in stm32f7xx_hal_conf.h, the functions in the file will actually be compiled and you'll be able to link the code.

 /* #define HAL_QSPI_MODULE_ENABLED   */
 /* #define HAL_RNG_MODULE_ENABLED   */
+#define HAL_RTC_MODULE_ENABLED
-/* #define HAL_RTC_MODULE_ENABLED */
 /* #define HAL_SAI_MODULE_ENABLED   */
 /* #define HAL_SD_MODULE_ENABLED   */