Re: dependency problem

[Stephan Beal]

On Thursday 28 June 2007, Philip Guenther wrote:
> foo.o: foo.c foo.h bar.h
>
> to:
>
> foo.o: foo.c foo.h bar.h
> foo.c foo.h bar.h:
>
> Simply mentioning the files as targets keeps make from complaining or
> doing anything when those files don't exist**.  

According to "Managing Projects with GNU Make", the section about deps 
gen addresses this problem and says (amongst other things):

-----------
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.
-----------

If you'll grab:

http://wh/computing/make/book/ManagingProjectsWithGNUMake-3.1.2.odt
(250k, ODT format)

or:

http://wh/computing/make/book/ManagingProjectsWithGNUMake-3.1.2.pdf
(1.2MB, PDF)

that topic is discussed starting on in section 10.3.1, page 110.

i hope that helps,

-- 
----- stephan beal
http://www.wanderinghorse.net

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