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Re: how exactly the makefiles are remade ?
From: |
Paul D. Smith |
Subject: |
Re: how exactly the makefiles are remade ? |
Date: |
Fri, 19 Dec 2003 08:14:36 -0500 |
%% Cristian Zoicas <address@hidden> writes:
cz> xxxx: gen.XXXX
cz> gen.XXXX:
cz> @echo generating xxxx
cz> @echo 'OBJECTS := a1.o b1.o b3.o' > xxxx;
This set of rules is wrong.
There is no rule to actually update xxxx (from make's perspective) so it
doesn't re-exec.
You have to write it like this:
xxxx:
@echo generating $@
@echo 'OBJECTS := a1.o b1.o b3.o' > $@;
Remember the Second Rule of Makefiles.
If you enable debugging with -d you'll see that with your makefile, make
is never re-exec'd which is why the new value is not seen.
--
-------------------------------------------------------------------------------
Paul D. Smith <address@hidden> Find some GNU make tips at:
http://www.gnu.org http://make.paulandlesley.org
"Please remain calm...I may be mad, but I am a professional." --Mad Scientist