🚀 go-pugleaf

In article <3h6f09$2ff8@tequesta.gate.net>, dhunt@gate.net (David R. Hunt)
wrote:

> 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:
> 
 
I've had the same desire to put object files in different directories. I've
tried using VPATH and vpath and I couldn't get them to work the way I wanted.
It seems that VPATH and vpath always look in the current directory first.
This is not what I wanted.
I wanted it to work like the PATH directive from Polymake. With Polymake
you could set a path for each file extension.
Ex. .PATH.OBJ=./OBJ;./DBOBJ
Polymake would look for a target .OBJ file in each directory in the
corresponding PATH.OBJ and if it wasn't found, it would be built in the
first
directory in the .PATH.OBJ

This is a fragment of a makefile that I've been using to locate object 
files into different directories using GNU make. I've edited out all the 
extraneous stuff. Hopefully, I left all the good stuff.

(I've been using GNU make from djgpp running on MS-DOG)

# start of makefile
# Jim Karpinski
# 02/09/95

# The macro CC is set in the environment to be either GCC or XGCC
# The goal of this is to put the object files for the
# gcc compiler in ./gcc
# xgcc compiler in ./xgcc

ODIR=$(CC)

$(ODIR)/%.o : %.c
   $(CC) $(CFLAGS) $(CDEBUG) -o $@ $< >>ccer

$(ODIR)/%.o : %.s
   $(CC) $(CFLAGS) $(CDEBUG) -o $@ $< >>ccer

ALLSRCS=$(wildcard *.c)
ALLOBJS=$(addprefix $(ODIR)/, $(ALLSRCS:.c=.o) )

DOALL: $(ODIR) $(ALLOBJS)
   ld -s -stats -Map g32.map D:/djgpp/lib/crt0.o $(ODIR)/*.o D:/djgpp/lib/libc.a

$(ODIR) :
   -mkdir $(ODIR)

$(ODIR)/src1.o :  inc1.h
$(ODIR)/src2.o :  inc2.h
$(ODIR)/src3.o :  inc3.h
 

# end of makefile

I hope this helps.

I spent alot of time trying to get VPATH or vpath to work. I just don't
understand how they should be used. They don't seem useful to me.

Jim Karpinski
jk55@cornell.edu