VS Code Not Finding Zephyr Include Paths

[viggyd-blur]

I'm following the dev academy lessons and I'm having a bit of an issue where VS Code intellisense isn't picking up on the include paths from zephyr (e.g. #include <zephyr/kernel.h>). I'm using v3.1.1 of the SDK/toolchain. The lesson says that these errors should go away after generating/building, but they aren't going away. I am able to compile just fine, so the build system is pulling in the files during compilation.

I looked through other posts on the forum and they mention a compile_commands.json, but I don't see that being generated and I'm not sure if that's relevant.

Any help is appreciated! It's very useful to be able to look through included header files, so it's a feature I'd like to be able to use, rather than needing to manually navigate to the SDK folder.

[dejans]

Hi,

Are you able to show your observations using some simple nrf sample? 

Can you point to the lesson which says that errors should go away?

It's very useful to be able to look through included header files

Can you describe what you want to do in more detail?

Best regards,
Dejan

[Stanley Jackson]

Hi Dejan,

Im having a similar issue. My application builds and runs fine but the "red squiggles" dont go away.
SDK: v3.1.1
Toolchain: v3.1.1
nRF Connect VSCode extension: v2025.9.798

Something else of note, in the VSCode output window (nRF Connect selected in the dropdown), I see the following error:

[09:54:07] Stale build configuration (modbus_rtu_server_test - build): Unable to find the SDK at path: C:/ncs/v3.1.1/zephyr
[09:54:12] Failure (code 1).
[09:54:15] Stale build configuration (modbus_rtu_server_test - build): Unable to find the SDK at path: C:/ncs/v3.1.1/zephyr
[09:54:15] Stale build configuration (modbus_rtu_server_test - build/modbus_rtu_server_test): Unable to find the SDK at path: C:/ncs/v3.1.1/zephyr

I have checked that file path and there stuff there.

I have just recently moved from SDK v2.7.0 to v3.1.1 (to get support for the nRF54L15DK).
I did not have this issue with v2.7.0 (although that SDK does not support the nRF54)

I too noticed the lack of `compile_commands.json` in the build output directory (where previously with v2.7.0 it was there).

I hope this provides some more information and I look forward to hearing any other suggestions.

Cheers