RTEMS | waf: Invalidate build on configuration change (!1093)

[SHIVAM DEOLANKAR (@D3athSkulll)]

SHIVAM DEOLANKAR commented on a discussion: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1093#note_144761


I investigated the dependency tracking as suggested. It appears that switching RTEMS_SMP regenerates cpukit/include/rtems/score/cpuopts.h, but this header was not tracked as a dependency for compilation tasks. As a result, object files built with the previous configuration were reused, which caused the linker errors.

I updated the build rules to include cpuopts.h as an explicit dependency for the compilation tasks. This ensures that when cpuopts.h changes (e.g., due to RTEMS_SMP toggling), the affected objects are rebuilt.

I tested the change by switching between RTEMS_SMP=False and RTEMS_SMP=True multiple times without running ./waf clean. The build now correctly recompiles the affected objects and completes successfully.

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1093#note_144761
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