cmake: dts: Use temporary file for dts.cmake #81340
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tejlmand
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tejlmand
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temporary blocking to allow further tests / investigations.
nordicjm
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In general this is not only tied to sysbuild.
Touching any file during CMake configure time can trigger additional build steps later.
Build steps which may be unnecessary if there are no changes to the configure time generated file.
This may not only be related to dts.cmake, but can be true for other files created at configure time.
Therefore this is not fixing a sysbuild issue, sysbuild just happens to be impacted more by this fact than other parts of the system.
Long term a more general handling of such cases would be nice so that we don't regenerate a file in the first place instead of having to generate, compare and move.
nordicjm
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Uses a temporary file for dts output then uses CMake to copy to the correct file if it has changed. This prevents a ping-pong issue when sysbuild is used of configuring and building cycle when nothing has changed and there is sysbuild code which loads in the devicetree data from an image Signed-off-by: Jamie McCrae <[email protected]>
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