undefined reference to `port_clear_status(EVENT_GROUP_SELECT_T, unsigned long)'
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greenstone
- Posts: 20
- Joined: Mon Jul 10, 2023 9:14 am
undefined reference to `port_clear_status(EVENT_GROUP_SELECT_T, unsigned long)'
Why does a simple project compile successfully by changing the source file A.cpp of custom component A to A.c, otherwise there will be a link error for undefined reference to "port_det_stat() - (in custom component B)"
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- .cpp->.c successful,otherwais fail
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MicroController
- Posts: 1725
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Re: undefined reference to `port_clear_status(EVENT_GROUP_SELECT_T, unsigned long)'
Is port_det_stat() declared as extern "C" when used from C++? (cf. https://embeddedartistry.com/blog/2017/ ... -extern-c/)
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greenstone
- Posts: 20
- Joined: Mon Jul 10, 2023 9:14 am
Re: undefined reference to `port_clear_status(EVENT_GROUP_SELECT_T, unsigned long)'
yes，the .h header file include "extren "C"MicroController wrote: ↑Fri Sep 06, 2024 3:39 amIs port_det_stat() declared as extern "C" when used from C++? (cf. https://embeddedartistry.com/blog/2017/ ... -extern-c/)
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- #ifdef __cplusplus
extern "C" {
#endif #ifdef __cplusplus
}
#endif - 1.png (36.84 KiB) Viewed 1000 times
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