Re: dependency problem

[John Graham-Cumming]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

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.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.2.2 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

iD8DBQFGg7mVLphrp73n/hARAp7NAKCSJHG8JdVO+DNCfHZscfPrLz8jnACfZ8br
wyp//uS02daxoq1sTnoyJas=
=FOuY
-----END PGP SIGNATURE-----