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1# SPDX-License-Identifier: GPL-2.02# Rules to generate bpf objs3CLANG ?= clang4SCRATCH_DIR := $(OUTPUT)/tools5BUILD_DIR := $(SCRATCH_DIR)/build6BPFDIR := $(top_srcdir)/tools/lib/bpf7APIDIR := $(top_srcdir)/tools/include/uapi8 9CCINCLUDE += -I$(selfdir)/bpf10CCINCLUDE += -I$(top_srcdir)/usr/include/11CCINCLUDE += -I$(SCRATCH_DIR)/include12 13BPFOBJ := $(BUILD_DIR)/libbpf/libbpf.a14 15MAKE_DIRS := $(BUILD_DIR)/libbpf16$(MAKE_DIRS):17 $(call msg,MKDIR,,$@)18 $(Q)mkdir -p $@19 20# Get Clang's default includes on this system, as opposed to those seen by21# '--target=bpf'. This fixes "missing" files on some architectures/distros,22# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc.23#24# Use '-idirafter': Don't interfere with include mechanics except where the25# build would have failed anyways.26define get_sys_includes27$(shell $(1) $(2) -v -E - </dev/null 2>&1 \28 | sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \29$(shell $(1) $(2) -dM -E - </dev/null | grep '__riscv_xlen ' | awk '{printf("-D__riscv_xlen=%d -D__BITS_PER_LONG=%d", $$3, $$3)}')30endef31 32ifneq ($(CROSS_COMPILE),)33CLANG_TARGET_ARCH = --target=$(notdir $(CROSS_COMPILE:%-=%))34endif35 36CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG),$(CLANG_TARGET_ARCH))37 38BPF_PROG_OBJS := $(patsubst %.c,$(OUTPUT)/%.o,$(wildcard *.bpf.c))39 40$(BPF_PROG_OBJS): $(OUTPUT)/%.o : %.c $(BPFOBJ) | $(MAKE_DIRS)41 $(call msg,BPF_PROG,,$@)42 $(Q)$(CLANG) -O2 -g --target=bpf $(CCINCLUDE) $(CLANG_SYS_INCLUDES) \43 -c $< -o $@44 45$(BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile) \46 $(APIDIR)/linux/bpf.h \47 | $(BUILD_DIR)/libbpf48 $(call msg,MAKE,,$@)49 $(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) OUTPUT=$(BUILD_DIR)/libbpf/ \50 EXTRA_CFLAGS='-g -O0' \51 DESTDIR=$(SCRATCH_DIR) prefix= all install_headers52 53EXTRA_CLEAN += $(SCRATCH_DIR)54