Using functions with automatic variables in makefiles

Question

I am trying to write a make file that compiles all of my C files under the source directory into the same file structure in /build/obj

For example one of my c files might be /source/foo/bar.c

And I want that to compile and be put in /build/obj/foo/bar.o

Here is what I've got so far while I was experimenting:

FILES = $(shell find source/ -type f -name '*.c')
OBJS = $(patsubst $(SOURCE)/%.c,$(OBJ)/%.o, $(FILES))

all: build/obj/foo/bar.o
    echo "DONE"

%.o:
    echo $(patsubst build/obj, source, $@)

However the patsubst function doesn't seem to be working with the automatic variable $@, instead I get "build/obj/foo/bar.o".

Is there a reason why automatic variables don't work with functions in make? If so how do I fix it?

Makefile for building source tree into separate build directory with preserved source tree structure - stackoverflow.com/a/41924169/4224163 — Alexey Semenyuk
– Alexey Semenyuk, Commented Feb 4, 2017 at 20:43

Michael Livshin · Accepted Answer · 2017-02-04 14:25:17Z

3

patsubst does nothing without a pattern, try $(patsubst build/obj/%,source/%,$@)

answered Feb 4, 2017 at 14:25

Michael Livshin

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