🚀 go-pugleaf

vsnyder@math.jpl.nasa.gov (Van Snyder) wrote:
>I have a simple makefile that compiles all the .c files in a directory and
>makes a library.  I want to make two libraries, one with debugging, and one
>with optimization.  The natural way (for me) to do that is to have two
>subdirectories of the source directory, in which I put the .o files compiled
>with different options (e.g. -g and -O).
>
> ...

Try using the VPATH or vpath directives (see section 4.3 of the GNU Make manual)
in combination with an implicit rule:

ODIR=O
LDIR=../L
VPATH=.;$(ODIR)

c.o:
	$(CC) -c $(CFLAGS) -o $(ODIR)/$*.o $<

OBJS =	this.o \
	that.o \
	theother.o

$(LDIR)/libthis.a:	$(OBJS)
	ar r $(LDIR)/libdos.a $(ODIR)/*.o

Hope this helps!
Dave Hunt