dsg@mbunix.mitre.org (David S. Goldberg) (05/12/89)
I am trying to find a way to change a macro without having to call the
change on the command line. In Sun's make, there is a := operator
that allows such changes, but the make in Ultrix 2.3 doesn't have this
feature. One thing that has worked is to do a recursive make, but
that doesn't seem as clean. I wonder if the :: operator, which I
unfortunately can't find documented anywhere (the Sun man page has a
little blurb on it, but nothing definitive - nothing in the tutorial
or any of the Ultrix docs mentions it). I prefer to RTFM, but haven't
been able to find this in any of the manuals I have.
Basically what I want to do is this:
CFLAGS = -I. -O
OBJECTS= *.o # I won't bore you with the real filenames
program: $(OBJECTS)
cc $(CFLAGS) $(OBJECTS) -o program
debug: # here I want to change CFLAGS to CFLAGS= -I. -g -DDEBUG and
# force recompilation of the whole thing. I tried:
make clean
make CFLAGS="-I. -g -DDEBUG" program
And that worked. It seems like there should be a better way. I
remember a similar question being asked a while ago, but I
unfortunately can't find any of those articles to see if they are
relevant to my problem.
I prefer not to generate a lot of net traffic with what seems (to my
embarassment) a pretty basic problem so please mail any replies to
dsg@mbunix.mitre.org or ...!linus!mbunix!dsg if you use UUCP.
Thanks in advance for any help.
Dave
--------------------------------------------------------------------------
Dave Goldberg ARPA: dsg@mitre.org
The Mitre Corporation UUCP: linus!mbunix!dsg
MS B020
Bedford, MA 01730
617-271-2460