1# SPDX-License-Identifier: GPL-2.0
2
3LIBDIR := ../../../lib
4BPFDIR := $(LIBDIR)/bpf
5APIDIR := ../../../include/uapi
6GENDIR := ../../../../include/generated
7GENHDR := $(GENDIR)/autoconf.h
8
9ifneq ($(wildcard $(GENHDR)),)
10  GENFLAGS := -DHAVE_GENHDR
11endif
12
13CFLAGS += -Wall -O2 -I$(APIDIR) -I$(LIBDIR) -I$(GENDIR) $(GENFLAGS) -I../../../include
14LDLIBS += -lcap -lelf -lrt
15
16TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test_progs \
17	test_align test_verifier_log test_dev_cgroup
18
19TEST_GEN_FILES = test_pkt_access.o test_xdp.o test_l4lb.o test_tcp_estats.o test_obj_id.o \
20	test_pkt_md_access.o test_xdp_redirect.o test_xdp_meta.o sockmap_parse_prog.o     \
21	sockmap_verdict_prog.o dev_cgroup.o
22
23TEST_PROGS := test_kmod.sh test_xdp_redirect.sh test_xdp_meta.sh
24
25include ../lib.mk
26
27BPFOBJ := $(OUTPUT)/libbpf.a $(OUTPUT)/cgroup_helpers.c
28
29$(TEST_GEN_PROGS): $(BPFOBJ)
30
31.PHONY: force
32
33# force a rebuild of BPFOBJ when its dependencies are updated
34force:
35
36$(BPFOBJ): force
37	$(MAKE) -C $(BPFDIR) OUTPUT=$(OUTPUT)/
38
39CLANG ?= clang
40LLC   ?= llc
41
42PROBE := $(shell $(LLC) -march=bpf -mcpu=probe -filetype=null /dev/null 2>&1)
43
44# Let newer LLVM versions transparently probe the kernel for availability
45# of full BPF instruction set.
46ifeq ($(PROBE),)
47  CPU ?= probe
48else
49  CPU ?= generic
50endif
51
52%.o: %.c
53	$(CLANG) -I. -I./include/uapi -I../../../include/uapi \
54		 -Wno-compare-distinct-pointer-types          \
55		 -O2 -target bpf -emit-llvm -c $< -o - |      \
56	$(LLC) -march=bpf -mcpu=$(CPU) -filetype=obj -o $@
57