[vox-tech] help with a makefile

[Aaron King]

I don't know if this is what you're looking for, but how's about this?

-----------------------
OBJS := $(patsubst %.c, %.o, $(patsubst src/%, objs/%, $(wildcard
src/*.c)))

objs/%.o: src/%.c
	$(CC) -c $(CFLAGS) -o objs/$*.o src/$*.c

target: $(OBJS)
-----------------------

Aaron


Peter Jay Salzman wrote:
> 
> hi all,
> 
> here is a makefile for one of my simulators:
> 
> TARGET = ising2-periodic
> TIMESTAMP = `/bin/date +'%Y-%b-%d-%H-%M'`
> BACKUPDIR = /usr/local/backup/ising2
> WARN = -Wall -W -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations
> CFLAGS = -O9 -ansi $(WARN)
> LFLAGS = -lm -L. -lpising2
> OBJS := $(patsubst %.c, %.o, $(wildcard *.c))
> 
> $(TARGET): $(OBJS)
>         gcc -o $@ $(OBJS) $(LFLAGS)
> 
> main.o: main.c pising2.h fsignal.h
> fsignal.o: fsignal.c fsignal.h
> 
> .PHONY: clean
> clean:
>    -rm -rf *.o a.out $(TARGET)
> 
> backup:
>         make clean
>         cd ..; tar -jcv ./$(TARGET) > "$(BACKUPDIR)/$(TARGET)-$(TIMESTAMP).tar.bz2"
>         echo "Saved to $(BACKUPDIR)/$(TARGET)-$(TIMESTAMP)."
>         echo "$(TARGET)-$(TIMESTAMP)" > .version
> 
> i would *like* to put all object files in ./objs.   i'm having a hard
> time figuring out how to do this.  i know how to have make look for the
> object files when it *links* the target:
> 
> vpath %.o ./objs
> 
> but that doesn't help during the *compilation* process.   is there a way
> to tell make:
> 
>    listen, make.  i like your implicit rules.  but when you make an
>    object file, i'd really appreciate it if you put it in "./objs"
>    rather than "."
> 
> so in other words, i KNOW how to do this by hard-coding the paths into
> the makefile.  what i'm really looking for is some kind of directive to
> modify the implicit rule.
> 
> kind of like how when you define $(CFLAGS) you don't need to explicitly
> say:
> 
>    target: foo.c foo.h
>         gcc $(CFLAGS) -o $@ $<
> 
> because make is smart enough to use your $(CFLAGS) even when you use an
> implicit rule:
> 
>    target: foo.c foo.h      # $(CFLAGS) is used here
> 
> i hope i explained this ok!  :)
> 
> pete
>