[nilason]

Set BUILD_ARCH with CMAKE_HOST_SYSTEM_PROCESSOR and remove custom function get_host_arch.

I see no reason to not use CMake's variable for setting this, after all that is deciding what/how to build anyway. The custom function requires maintenance, macOS is currently not supported and defaults to x86_64.

The only effect this has is the build_platform output of g.version -g. Otherwise BUILD_ARCH is mainly a remnant of Autotools builds, where build output directory is named after Autotool's host variable (e.g. dist.aarch64-apple-darwin25.3.0; note: this is not the same as just uname -m) and this is passed to various Python build scripts, in CMake it doesn't play any role.

[wenzeslaus]

Change to CMAKE_SYSTEM_PROCESSOR because the idea of build_platform where this is used seems to be "platform it is build for", not "platform it was build on".

[echoix]

There's conflicts to solve

[nilason]

There's conflicts to solve

Thanks for the heads-up, fixed.

[echoix]

Looks good now, and there is still the grass --config arch to fix by using https://github.com/OSGeo/grass/blob/main/python/grass/app/resource_paths.py, as your comment #7369 (comment)

This should still be merged though, maybe track an issue in order to not forget to do that?

[nilason]

Looks good now, and there is still the grass --config arch to fix by using https://github.com/OSGeo/grass/blob/main/python/grass/app/resource_paths.py, as your comment #7369 (comment)

This should still be merged though, maybe track an issue in order to not forget to do that?

It is done with #7875

[nilason]

@wenzeslaus please take a look at this, your requested change is blocking this from merging.

Implemented changes, let’s move forward.