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Stephan Beal wrote:
> -----------
> The -MP option instructs gcc to include phony targets
for each
> prerequisite. This completely eliminates the messy
five-part sed
> expression in our make-depend function. It seems that
the automake
> developers who invented the phony target technique
caused this option
> to be added to gcc.
> -----------
>
> that topic is discussed starting on in section 10.3.1,
page 110.
In the printed book it's page 153.
It's worth noting that the language above is very sloppy.
The -MP
option does not output a 'phony' target (which has a special
meaning in
GNU Make), but simply outputs a rule with no commands for
the target.
For example, if foo.c include foo.h then gcc -MM -MP foo.c
emits:
foo.o: foo.c foo.h
foo.h:
John.
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