Using application defined Kconfig option in CMakeLists

RE: Using application defined Kconfig option in CMakeLists

Håkon Alseth — Mon, 29 Jan 2024 08:26:50 GMT

Hi,

[quote user="Nathan45"]I need to set a build flag related to a device tree overlay based on my prj.conf.[/quote]

prj.conf::CONFIG_X=y, should then include a dts overlay.

I have not seen any samples of doing this directly, as you mention; the ordering will be incorrect.

Could you try to differentiate based on the board itself instead?

Kind regards,

Håkon

RE: Using application defined Kconfig option in CMakeLists

Nathan45 — Sat, 27 Jan 2024 00:04:58 GMT

I have a similar issue. I need to set a build flag related to a device tree overlay based on my prj.conf. However, this doesn't seem to work since the prj.conf doesn't get loaded in until after the find_package(...). But after the find_package(...) it's too late to configure the device tree (according to the error I get.

I don't know what to do

RE: Using application defined Kconfig option in CMakeLists

Håkon Alseth — Wed, 17 Jan 2024 16:01:24 GMT

Hi,

[quote user="george232"]Ahhh I see. Kconfig is simply parsed after I do the check the reason because `find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})` executed to late in my CMakeList.txt... sorry for bothering.[/quote]

No bother! I'm glad to hear that you found a solution. Let me know if there's anything else that pops up. Hope you have a wonderful day!

Kind regards,

Håkon

RE: Using application defined Kconfig option in CMakeLists

george232 — Wed, 17 Jan 2024 14:12:57 GMT

Ahhh I see. Kconfig is simply parsed after I do the check because `find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})` is executed too late in my CMakeList.txt... sorry for bothering.

RE: Using application defined Kconfig option in CMakeLists

george232 — Wed, 17 Jan 2024 13:30:10 GMT

Sorry, I guess I limited the scope of operations executed in the if branch to compilation of files, where in fact apart from that I need to, among others, set PM_STATIC_YML_FILE and EXTRA_CONFIG_FILE.

I guess target_sources_ifdef will work for pulling the files in, but it won't solve my problem.

RE: Using application defined Kconfig option in CMakeLists

Håkon Alseth — Wed, 17 Jan 2024 12:53:50 GMT

Hi,

Could you try to use the target_sources_ifdef() instead?

Here is an example:

https://github.com/nrfconnect/sdk-nrf/blob/v2.5.1/applications/asset_tracker_v2/src/modules/CMakeLists.txt#L9C1-L9C1

Kind regards,

Håkon