1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 # Rules to generate bpf objs 2 # Rules to generate bpf objs
3 CLANG ?= clang 3 CLANG ?= clang
4 SCRATCH_DIR := $(OUTPUT)/tools 4 SCRATCH_DIR := $(OUTPUT)/tools
5 BUILD_DIR := $(SCRATCH_DIR)/build 5 BUILD_DIR := $(SCRATCH_DIR)/build
6 BPFDIR := $(top_srcdir)/tools/lib/bpf 6 BPFDIR := $(top_srcdir)/tools/lib/bpf
7 APIDIR := $(top_srcdir)/tools/include/uapi 7 APIDIR := $(top_srcdir)/tools/include/uapi
8 8
9 CCINCLUDE += -I$(selfdir)/bpf 9 CCINCLUDE += -I$(selfdir)/bpf
10 CCINCLUDE += -I$(top_srcdir)/usr/include/ 10 CCINCLUDE += -I$(top_srcdir)/usr/include/
11 CCINCLUDE += -I$(SCRATCH_DIR)/include 11 CCINCLUDE += -I$(SCRATCH_DIR)/include
12 12
13 BPFOBJ := $(BUILD_DIR)/libbpf/libbpf.a 13 BPFOBJ := $(BUILD_DIR)/libbpf/libbpf.a
14 14
15 MAKE_DIRS := $(BUILD_DIR)/libbpf 15 MAKE_DIRS := $(BUILD_DIR)/libbpf
16 $(MAKE_DIRS): 16 $(MAKE_DIRS):
17 $(call msg,MKDIR,,$@) 17 $(call msg,MKDIR,,$@)
18 $(Q)mkdir -p $@ 18 $(Q)mkdir -p $@
19 19
20 # Get Clang's default includes on this system, 20 # Get Clang's default includes on this system, as opposed to those seen by
21 # '--target=bpf'. This fixes "missing" files o 21 # '--target=bpf'. This fixes "missing" files on some architectures/distros,
22 # such as asm/byteorder.h, asm/socket.h, asm/s 22 # such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc.
23 # 23 #
24 # Use '-idirafter': Don't interfere with inclu 24 # Use '-idirafter': Don't interfere with include mechanics except where the
25 # build would have failed anyways. 25 # build would have failed anyways.
26 define get_sys_includes 26 define get_sys_includes
27 $(shell $(1) $(2) -v -E - </dev/null 2>&1 \ 27 $(shell $(1) $(2) -v -E - </dev/null 2>&1 \
28 | sed -n '/<...> search starts here:/, 28 | sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \
29 $(shell $(1) $(2) -dM -E - </dev/null | grep ' 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 30 endef
31 31
32 ifneq ($(CROSS_COMPILE),) 32 ifneq ($(CROSS_COMPILE),)
33 CLANG_TARGET_ARCH = --target=$(notdir $(CROSS_ 33 CLANG_TARGET_ARCH = --target=$(notdir $(CROSS_COMPILE:%-=%))
34 endif 34 endif
35 35
36 CLANG_SYS_INCLUDES = $(call get_sys_includes,$ 36 CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG),$(CLANG_TARGET_ARCH))
37 37
38 BPF_PROG_OBJS := $(patsubst %.c,$(OUTPUT)/%.o, 38 BPF_PROG_OBJS := $(patsubst %.c,$(OUTPUT)/%.o,$(wildcard *.bpf.c))
39 39
40 $(BPF_PROG_OBJS): $(OUTPUT)/%.o : %.c $(BPFOBJ 40 $(BPF_PROG_OBJS): $(OUTPUT)/%.o : %.c $(BPFOBJ) | $(MAKE_DIRS)
41 $(call msg,BPF_PROG,,$@) 41 $(call msg,BPF_PROG,,$@)
42 $(Q)$(CLANG) -O2 -g --target=bpf $(CCI 42 $(Q)$(CLANG) -O2 -g --target=bpf $(CCINCLUDE) $(CLANG_SYS_INCLUDES) \
43 -c $< -o $@ 43 -c $< -o $@
44 44
45 $(BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDI 45 $(BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile) \
46 $(APIDIR)/linux/bpf.h 46 $(APIDIR)/linux/bpf.h \
47 | $(BUILD_DIR)/libbpf 47 | $(BUILD_DIR)/libbpf
48 $(call msg,MAKE,,$@) 48 $(call msg,MAKE,,$@)
49 $(Q)$(MAKE) $(submake_extras) -C $(BPF 49 $(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) OUTPUT=$(BUILD_DIR)/libbpf/ \
50 EXTRA_CFLAGS='-g -O0' 50 EXTRA_CFLAGS='-g -O0' \
51 DESTDIR=$(SCRATCH_DIR) pre 51 DESTDIR=$(SCRATCH_DIR) prefix= all install_headers
52 52
53 EXTRA_CLEAN += $(SCRATCH_DIR) 53 EXTRA_CLEAN += $(SCRATCH_DIR)
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