From:	Rik Blok <blok AT physics DOT ubc DOT ca>
Newsgroups:	comp.os.msdos.djgpp
Subject:	updating command-line variables in make?
Date:	Sat, 11 Oct 1997 20:10:16 -0700
Organization:	Lynx Internet
Lines:	24
Message-ID:	<34403F98.699BFBAF@physics.ubc.ca>
NNTP-Posting-Host:	lynx1042.lynx.bc.ca
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

I have a makefile with the line

	CFLAGS += -I$(INCLUDE_LIBS)

and I sometimes want to call the makefile with CFLAGS preset 

	make CFLAGS=-g

but this seems to override CFLAGS instead of just initializing it.  How
can I make this result in 

	CFLAGS = -g -I$(INCLUDE_DIRS)

I'm new to make and any help would be appreciated.
	Rik Blok

P.S. Is it possible to copy an implicit rule?  For example, is there a
generic way to copy the rule for %:%.o to %.exe:%.o?  

-- 
Rik Blok  <blok AT physics DOT ubc DOT ca>
Department of Physics and Astronomy,
University of British Columbia, Canada
http://www.physics.ubc.ca/~blok

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