Application.mk: Add missing preconfig target #3386
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When running 'make preconfig' from the apps directory (e.g. to regenerate Kconfig files with absolute paths), the build fails in subdirectories that include Application.mk but do not define a preconfig target (e.g., apps/modbus, apps/nshlib). This commit adds a dummy preconfig target to Application.mk to ensure the recursive make successfully traverses these directories. Signed-off-by: makejian <[email protected]>
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Summary
This PR adds a default
preconfigtarget toApplication.mk. This ensures that themake preconfigcommand (used to generate/updateapps/Kconfigand sub-Kconfigs) can execute successfully across all subdirectories, even those that do not manage their ownKconfigfiles (e.g.,modbus,nshlib).Impact
This fix improves the robustness of the NuttX build system, specifically for environment reconfiguration scenarios. Without this fix, users cannot easily regenerate stale Kconfig files if their directory structure changes, as the recursive make process is blocked by subdirectories missing the
preconfigtarget.Testing
appsandnuttxdirectories to a new parent location, invalidating existing Kconfig absolute/relative paths.make preconfig TOPDIR=...inapps/failed with:make[1]: Entering directory '/path/to/apps/modbus' make[1]: *** No rule to make target 'preconfig'. Stop.make preconfigcompletes successfully. Theapps/Kconfigis correctly regenerated with valid absolute paths, restoring build functionality.