1# SPDX-License-Identifier: GPL-2.0 2include ../scripts/Makefile.include 3 4bindir ?= /usr/bin 5 6ifeq ($(srctree),) 7srctree := $(patsubst %/,%,$(dir $(CURDIR))) 8srctree := $(patsubst %/,%,$(dir $(srctree))) 9endif 10 11# Do not use make's built-in rules 12# (this improves performance and avoids hard-to-debug behaviour); 13MAKEFLAGS += -r 14 15override CFLAGS += -O2 -Wall -g -D_GNU_SOURCE -I$(OUTPUT)include 16 17ALL_TARGETS := counter_example 18ALL_PROGRAMS := $(patsubst %,$(OUTPUT)%,$(ALL_TARGETS)) 19 20all: $(ALL_PROGRAMS) 21 22export srctree OUTPUT CC LD CFLAGS 23include $(srctree)/tools/build/Makefile.include 24 25# 26# We need the following to be outside of kernel tree 27# 28$(OUTPUT)include/linux/counter.h: ../../include/uapi/linux/counter.h 29 mkdir -p $(OUTPUT)include/linux 2>&1 || true 30 ln -sf $(CURDIR)/../../include/uapi/linux/counter.h $@ 31 32prepare: $(OUTPUT)include/linux/counter.h 33 34COUNTER_EXAMPLE := $(OUTPUT)counter_example.o 35$(COUNTER_EXAMPLE): prepare FORCE 36 $(Q)$(MAKE) $(build)=counter_example 37$(OUTPUT)counter_example: $(COUNTER_EXAMPLE) 38 $(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) $< -o $@ 39 40clean: 41 rm -f $(ALL_PROGRAMS) 42 rm -rf $(OUTPUT)include/linux/counter.h 43 rm -df $(OUTPUT)include/linux 44 rm -df $(OUTPUT)include 45 find $(or $(OUTPUT),.) -name '*.o' -delete -o -name '\.*.d' -delete 46 47install: $(ALL_PROGRAMS) 48 install -d -m 755 $(DESTDIR)$(bindir); \ 49 for program in $(ALL_PROGRAMS); do \ 50 install $$program $(DESTDIR)$(bindir); \ 51 done 52 53FORCE: 54 55.PHONY: all install clean FORCE prepare 56