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From: evas@euraiv1.UUCP (Eelco van Asperen)
Newsgroups: comp.unix.questions
Subject: Re: Using subdirectories from make
Message-ID: <595@euraiv1.UUCP>
Date: Tue, 29-Sep-87 12:38:58 EDT
Article-I.D.: euraiv1.595
Posted: Tue Sep 29 12:38:58 1987
Date-Received: Sat, 3-Oct-87 08:27:29 EDT
References: <831@ektools.UUCP> <204@tut.cis.ohio-state.edu> <1413@ihlpm.ATT.COM>
Organization: Erasmus University EF/AIV,Rotterdam,Netherlands
Lines: 30
Summary: inference rules that know about subdirectories

In article <1413@ihlpm.ATT.COM>, snafu@ihlpm.ATT.COM (Wallis) writes:
>
> $(OBJ_DIR)/foo.o: $(SRC_DIR)/foo.c $(INC_DIR)/hdr.h
> 		$(CC) $(CFLAGS) $(SRC_DIR)/bar.c
> 
> $(OBJ_DIR)/bar.o: $(SRC_DIR)/bar.c $(INC_DIR)/hdr.h
> 		$(CC) $(CFLAGS) $(SPEC_DEFS) $(SRC_DIR)/bar.c

This works but what I'ld really want are inference rules that "know"
about sub-directories; fe.

	.c.o:
		cc $(CFLAGS) $< -o $(OBJ_DIR)

	$(OBJ_DIR)/foo.o:	$(SRC_DIR)/foo.c $(INC_DIR)/hdr.h

This apparently failes with the current make because a pathname ending in
.o (fe. obj/foo.o) will not match the '.c.o' template that is defined for
the inference rule so make will complain "don't know how to make foo.o".
Unless someone can come up with a (valid) reason for this behaviour, 
I consider this a bug in make.

Eelco van Asperen.

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