unable to force makefile to rebuild on headers changes

[DaggyStyle]

greetings, I have the following makefile:

Code: Select all

# The directories containing the source files, separated by ':'
VPATH = ../../../src/utils/:../../

SRCS = file1.c file2.c file3.c

OBJS = $(patsubst %.c, objs/%.o, ${SRCS})

ROOT = ../../../

CFLAGS = -g $(EXT_CC_FLAGS) 
INCLUDES = -I$(ROOT)/src/ -I$(ROOT)/src/hdr -I../../ -I.
DEFINES = -D_LARGEFILE64_SOURCE
LDFLAGS = -static -L$(ROOT)/libs/numactl -lnuma

TARGET=abc

all: $(TARGET)

.PHONY: clean help all

$(TARGET): $(OBJS)
	$(CC) -o $@ $^ $(LDFLAGS)

objs/%.o: %.c
	@mkdir -p $(dir $@)
	$(CC) -c $(CFLAGS) $(DEFINES) $(INCLUDES) -o $@ $<

install:
		# install stuff

clean:
	-rm -rf objs/ $(TARGET)

depend: .depend

.depend: $(SRCS)
	rm -f ./.depend
	$(CC) $(CFLAGS) $(DEFINES) $(INCLUDES) -MM $^>>./.depend;

include .depend

file1.c includes a header named file1.h, I want to recompile the file1.c if file1.h is changed and I need it in a generic way.

it seems that .depend does holds a dep files list but when I change file1.h I run make, file1.c doesn't recompiles, any hints?

Thanks.

[roseZ]

What exactly does the .depend file look like?

It seems to me that $(TARGET) depends on file1.c via obj/file1.o, but obj/file1.o may not depend on file1.h.
At least this is the case if .depend contains, as I'm guessing, a line like

Code: Select all

file1.o: file1.c file1.h

instead of

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obj/file1.o: file1.c file1.h

[DaggyStyle]

thanks for the tip, I'd prefer not to do that but I'll check, thanks.