tools/testing/selftests/net/bpf.mk

   1 # SPDX-License-Identifier: GPL-2.0
   2 # Rules to generate bpf objs
   3 CLANG ?= clang
   4 SCRATCH_DIR := $(OUTPUT)/tools
   5 BUILD_DIR := $(SCRATCH_DIR)/build
   6 BPFDIR := $(top_srcdir)/tools/lib/bpf
   7 APIDIR := $(top_srcdir)/tools/include/uapi
   8
   9 CCINCLUDE += -I$(selfdir)/bpf
  10 CCINCLUDE += -I$(top_srcdir)/usr/include/
  11 CCINCLUDE += -I$(SCRATCH_DIR)/include
  12
  13 BPFOBJ := $(BUILD_DIR)/libbpf/libbpf.a
  14
  15 MAKE_DIRS := $(BUILD_DIR)/libbpf
  16 $(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 by
  21 # '--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 the
  25 # build would have failed anyways.
  26 define get_sys_includes
  27 $(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)}')
  30 endef
  31
  32 ifneq ($(CROSS_COMPILE),)
  33 CLANG_TARGET_ARCH = --target=$(notdir $(CROSS_COMPILE:%-=%))
  34 endif
  35
  36 CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG),$(CLANG_TARGET_ARCH))
  37
  38 BPF_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)/libbpf
  48         $(call msg,MAKE,,$@)
  49         $(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) OUTPUT=$(BUILD_DIR)/libbpf/ \
  50                     EXTRA_CFLAGS='-g -O0'                                      \
  51                     DESTDIR=$(SCRATCH_DIR) prefix= all install_headers
  52
  53 EXTRA_CLEAN += $(SCRATCH_DIR)