sysbuild: Fix exporting BOARD.+ through sysbuild cache #59130
Merged
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Lately, sysbuild started filtering out variable names matching ^BOARD during sysbuild cache file generation. As a result, one of the cache variables that is no longer exported to other domains is BOARD_ROOT, which breaks the recent support for out-of-tree boards in sysbuild.
Of those variables, the only one which is reasonable to filter out is BOARD itself, because the purpose of that is to substitute a different value for the one found in sysbuild's own CMake cache, which has the board revision stripped out.
Update the relevant if-condition and use a single regex for brevity.
Fixes #59114.