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From: osbornk@mist.cs.orst.edu (Kasey S. Osborn)
Newsgroups: comp.unix.questions
Subject: Makefile inference rule
Keywords: make
Message-ID: <18769@orstcs.CS.ORST.EDU>
Date: 7 Jun 90 03:43:51 GMT
Sender: usenet@orstcs.CS.ORST.EDU
Reply-To: osbornk@cs.orst.edu (Kasey S. Osborn)
Organization: Oregon State University, Corvallis
Lines: 29


I am trying to establish an inference rule to build executables from
objects.  Here is a highlight of my makefile:

  OBJS = gc.o mem.o

  .c.o:
          cc -ansi -g -c -w0,-Wall $<           # This works fine.

  .o:
          cc -g $(OBJS) $< -o $@                # This is ignored!!!

  box:    $(OBJS) box.o

  box.o:  box.c gc.h

The key here is the .o: inference rule.  It is completely ignored, yet
documentation I read tells me this is how it is done.  I get no diagnostic
message, just a new prompt.  Ironically, if I remove the line:

  box:    $(OBJS) box.o

and invoke "make box", the .o: inference rule takes effect.  However,
the additional dependencies (OBJS) are ignored.

Does anyone have a clue?

Kasey S. Osborn
"There's a lot to be said for brevity."