1# SPDX-License-Identifier: GPL-2.0
2OUTPUT := .output
3abs_out := $(abspath $(OUTPUT))
4
5CLANG ?= clang
6LLC ?= llc
7LLVM_STRIP ?= llvm-strip
8
9TOOLS_PATH := $(abspath ../../../../tools)
10BPFTOOL_SRC := $(TOOLS_PATH)/bpf/bpftool
11BPFTOOL_OUTPUT := $(abs_out)/bpftool
12DEFAULT_BPFTOOL := $(BPFTOOL_OUTPUT)/bootstrap/bpftool
13BPFTOOL ?= $(DEFAULT_BPFTOOL)
14
15LIBBPF_SRC := $(TOOLS_PATH)/lib/bpf
16LIBBPF_OUTPUT := $(abs_out)/libbpf
17LIBBPF_DESTDIR := $(LIBBPF_OUTPUT)
18LIBBPF_INCLUDE := $(LIBBPF_DESTDIR)/include
19BPFOBJ := $(LIBBPF_OUTPUT)/libbpf.a
20
21INCLUDES := -I$(OUTPUT) -I$(LIBBPF_INCLUDE) -I$(TOOLS_PATH)/include/uapi
22CFLAGS := -g -Wall
23
24ifeq ($(V),1)
25Q =
26msg =
27else
28Q = @
29msg = @printf '  %-8s %s%s\n' "$(1)" "$(notdir $(2))" "$(if $(3), $(3))";
30MAKEFLAGS += --no-print-directory
31submake_extras := feature_display=0
32endif
33
34.DELETE_ON_ERROR:
35
36.PHONY: all clean
37
38all: iterators.lskel.h
39
40clean:
41	$(call msg,CLEAN)
42	$(Q)rm -rf $(OUTPUT) iterators
43
44iterators.lskel.h: $(OUTPUT)/iterators.bpf.o | $(BPFTOOL)
45	$(call msg,GEN-SKEL,$@)
46	$(Q)$(BPFTOOL) gen skeleton -L $< > $@
47
48
49$(OUTPUT)/iterators.bpf.o: iterators.bpf.c $(BPFOBJ) | $(OUTPUT)
50	$(call msg,BPF,$@)
51	$(Q)$(CLANG) -g -O2 -target bpf $(INCLUDES)			      \
52		 -c $(filter %.c,$^) -o $@ &&				      \
53	$(LLVM_STRIP) -g $@
54
55$(OUTPUT) $(LIBBPF_OUTPUT) $(BPFTOOL_OUTPUT):
56	$(call msg,MKDIR,$@)
57	$(Q)mkdir -p $@
58
59$(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(LIBBPF_OUTPUT)
60	$(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC)			       \
61		    OUTPUT=$(abspath $(dir $@))/ prefix=		       \
62		    DESTDIR=$(LIBBPF_DESTDIR) $(abspath $@) install_headers
63
64$(DEFAULT_BPFTOOL): | $(BPFTOOL_OUTPUT)
65	$(Q)$(MAKE) $(submake_extras) -C $(BPFTOOL_SRC)	OUTPUT=$(BPFTOOL_OUTPUT)/ bootstrap
66