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stm32f4xx conf and linker

Well, hello!

I have a inc structure to my project with most files in root directory, some in ./inc (startup_*.h and *_conf.h) and than inc and src inside ./STM32F4xx_StdPeriph_Driver. Up until this point, I have had adc, gpio and rcc undocumented. But now, I wanted to change some code up with using functions from tim, but after uncomenting that line and using this function:

TIM_GetITStatus(TIM2, TIM_IT_Update)

Results in spitting out an error, that this function is "undefined symbol" - errno L6218E, referred from something.o

Meanwhile just using constants from *_tim.h does work normally (but I need more)

I am not able to get this to work. Also adding some other arbitrary library by uncomenting results in same problems. What am I missing?