Messages in this thread | | | From | David Laight <> | Subject | RE: [PATCH] KVM: selftests: add -MP to CFLAGS | Date | Sun, 29 Oct 2023 21:13:41 +0000 |
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From: David Woodhouse > Sent: 28 October 2023 20:35 > > Using -MD without -MP causes build failures when a header file is deleted > or moved. With -MP, the compiler will emit phony targets for the header > files it lists as dependencies, and the Makefiles won't refuse to attempt > to rebuild a C unit which no longer includes the deleted header.
Won't a phony target stop a header being built if there is an actual rule to build it?
I usually add:
%.h: echo "Ignoring stale dependency for $@"
Which only applies if there isn't an explicit rule.
David
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