build: rebuild when the compile command changes - #524
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Record COMPILE_CMD in the object directory and make the target depend on it. Flag-only changes now invalidate an existing binary without forcing every invocation to rebuild.
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What changed
Record the complete compiler command in
$(OBJDIR)/build-flagsand make the output target depend on that stamp.Root cause
Source timestamps alone do not capture flag-only changes. Updating a version flag or platform compiler option could therefore leave an existing binary built with the previous command.
Impact
The stamp timestamp changes only when
COMPILE_CMDchanges, so normal incremental builds remain quiet while flag-only changes rebuild the target.Validation
make -q CONFIG=debugreturned up to dateDFLAGS:make -qreturned stalemake -qreturned stale, followed by a successful rebuild