Linker fails, gcc, SDK 13.0.0, nRF52: "undefined reference to ..."

RE: Linker fails, gcc, SDK 13.0.0, nRF52: "undefined reference to ..."

endnode — Tue, 21 Nov 2017 04:31:39 GMT

That's always a trad-off: do you want to have new features and things moving forward (hence API changes hence some migration effort hence trauma for some engineers used to just click buttons in Keil or similar masterpiece) or do you want to stay with this feature set forever?

RE: Linker fails, gcc, SDK 13.0.0, nRF52: "undefined reference to ..."

Thomas — Tue, 21 Nov 2017 04:04:36 GMT

OMG: "With every SDK release I lose about a day on this."

We loose almost a week to recover from SDK migration trauma.

RE: Linker fails, gcc, SDK 13.0.0, nRF52: "undefined reference to ..."

Eliot Stock — Thu, 13 Apr 2017 08:12:36 GMT

@endnode Your initial suspicion was correct! Although the defines you mentioned were all there, there were a few others that weren't. The problem, once again, is that I wrongly assumed that nRF5_SDK_13.0.0_04a0bfd/examples/ble_peripheral/ble_app_template/pca10040/s132/config/sdk_config.h was a complete file. It's not. With every SDK release I lose about a day on this. I'm now using nRF5_SDK_13.0.0_04a0bfd/config/sdk_config.h directly in my build and defining my own stuff in an app_config.h as you suggested.

RE: Linker fails, gcc, SDK 13.0.0, nRF52: "undefined reference to ..."

Eliot Stock — Wed, 12 Apr 2017 20:13:22 GMT

For this migration I took the sdk_config.h file from examples/ble_peripheral/ble_app_template/pca10040/s132/config and used that, then diff'ed it against what I had from SDK 12 and just updated the values. I don't use the app_config.h because had nothing to add to sdk_config.h (except APP_FIFO_ENABLED, which you rightly identified was missing). Looking for sdk_config.h files in the SDK that might be being pulled in, I see only one that's outside of /examples and that's in /config. I don't have that directory on my include path. I can see that the sdk_config.h from in my project is the one being used by putting an #error Am I being used? in it and rebuilding. The build breaks as expected. I'll attach an .o and a .d file above in case that sheds any light on it. Thanks.

RE: Linker fails, gcc, SDK 13.0.0, nRF52: "undefined reference to ..."

endnode — Wed, 12 Apr 2017 19:47:32 GMT

Also by pure visual diff of SDK v12.2.0 and v13.0.0 I see that app_xxx and nrf_xxx files you are using haven't changed (beside licensing header comment) so the main difference is location of sdk_config.h in the SDK folders' structure. Do you write your own or you use "default" one from SDK and just overload it by USE_APP_CONFIG global define and app_config.h custom file in your project (personally I like the latter option more)? Actually there was nothing like "default" (or "full") sdk_config.h in SDK v12.2.0, this seems to be new concept. I believe your problem is there, some defines are simply missing and SDK modules don't get compiled with all functions you call (so header files make them visible during compilation but linker doesn't find body of the function in .d/.o files).

RE: Linker fails, gcc, SDK 13.0.0, nRF52: "undefined reference to ..."

endnode — Wed, 12 Apr 2017 19:10:21 GMT

Mhm. *.d and *.o files don't suggest where you lost few functions from app_xxx and nrf_xxx modules? Some files should remain unchanged between SDK migrations and if you same compiler version it should be generating 100% equal binaries... otherwise I'm out of ideas, sorry;)

RE: Linker fails, gcc, SDK 13.0.0, nRF52: "undefined reference to ..."

Eliot Stock — Wed, 12 Apr 2017 18:58:45 GMT

Nope, with the exception of APP_FIFO_ENABLED (which I've now added) they were all there already and already had those values.

RE: Linker fails, gcc, SDK 13.0.0, nRF52: "undefined reference to ..."

endnode — Wed, 12 Apr 2017 18:48:45 GMT

I'd say you have included files from app_uart and app_fifo modules but you probably haven't defined few things in sdk_config.h or rather app_config.h like

#define APP_UART_ENABLED 1
#define UART_ENABLED 1
#define UART0_CONFIG_USE_EASY_DMA 1
#define APP_UART_DRIVER_INSTANCE 0
#define APP_FIFO_ENABLED 1

There were few changes around sdk_config.h (it's position in SDK, "default" content etc.)