Makefile VPATH problems/questions

Ralph Seguin (seguin++at++vr2.engin.umich.edu)
Thu, 20 Jun 1996 10:47:17 -0400

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   I'm sure that I'm going to receive a sound thrashing for posting
unrelated material to this list :)
Apologies in advance.

Ok. Here's the situation. I have a directory structure as follows:

SomeProject/
   src/
      RCS/
      obj1.c++
      obj1.o
      obj2.c++
      obj2.o
      obj3.c++
      obj3.o

   seguin/
      RCS --> ../src/RCS
      obj2.c++ (I'm working on it, so it's newer than ../src/obj2.c++)

Ie, work directories parallel to the src dir. Everything is RCSed
in src/RCS. Work dirs should only contain those sources/headers that
are being currently modified.

I have my Makefile set up something like:

# Set up the VPATH so that we don't need much in our work dir.
# Just what we are working on.
VPATH=.:../src

OBJS=obj1.o obj2.o obj3.o

# Implicit productions
.c++.o:
        $(CCXX) $(CCXXOPTS) -c $<

.c.o:
        $(CC) $(CCOPTS) -c $<

# Build a library.
mylib.a: $(OBJS)
        $(AR) $(AROPTS) -cr $++at++ $(OBJS)

# Dependencies
obj1.o: obj1.c++

obj2.o: obj2.c++

obj3.o: obj3.c++

Soooooo... when I do a make, I want the following to happen:

   ac -cr mylib.a ../src/obj1.o obj2.o ../src/obj3.o

Ie, I want it to take stuff from ../src if it isn't in my work directory.
I used to use a version of make from UC Berkeley which did the trick fine
with the above VPATH statement.

If I use IRIX 5.3 make, I get:
   ac -cr mylib.a obj1.o obj2.o obj3.o

If I use GNU make, I get:
   ac -cr ../src/mylib.a obj1.o obj2.o obj3.o

If I use GNU make, and I put the following into the Makefile, in place of
the single VPATH macro assignment:
vpath %.c++ .:../src
vpath %.o .:../src
vpath %.h .:../src
vpath %.a

I get the same results as in the IRIX make. Ie,
   ac -cr mylib.a obj1.o obj2.o obj3.o

What am I doing wrong here?

Anybody know of or can give me a URL for the Berkeley make I'm talking about?

I've looked at the make man page a couple of times; I guess I'm just
not reading carefully enough or something...

Thanks.
-Ralph

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