On Mon, 2023-10-30 at 10:08 +0000, David Laight wrote: > From: David Woodhouse > > Sent: 30 October 2023 09:46 > > > > On Sun, 2023-10-29 at 21:13 +0000, David Laight wrote: > > > 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? > > > > It probably would have taken you about the same time to find the answer > > for yourself, as it took to write that email. Why don't you try it? > > I was sure that just adding > > foo.h: > > would generate a 'no rules to build' error. > Maybe that was BSD make or SYS-V make. > > But calling the 'phony' is probably wrong. > PHONY has a very specific meaning to make - and these aren't PHONY. I recommend filing a bug against the GCC documentation then. https://gcc.gnu.org/onlinedocs/gcc/Preprocessor-Options.html#index-MP
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