blob: 9291ab8e0f8c5a089425ae65f9ee20e718e0a9ff [file] [log] [blame]
John Fastabend69e8cc12017-08-15 22:33:32 -07001# kbuild trick to avoid linker error. Can be omitted if a module is built.
2obj- := dummy.o
3
4# List of programs to build
5hostprogs-y := sockmap
6
7# Libbpf dependencies
8LIBBPF := ../../tools/lib/bpf/bpf.o
9
10HOSTCFLAGS += -I$(objtree)/usr/include
11HOSTCFLAGS += -I$(srctree)/tools/lib/
12HOSTCFLAGS += -I$(srctree)/tools/testing/selftests/bpf/
13HOSTCFLAGS += -I$(srctree)/tools/lib/ -I$(srctree)/tools/include
14HOSTCFLAGS += -I$(srctree)/tools/perf
15
16sockmap-objs := ../bpf/bpf_load.o $(LIBBPF) sockmap_user.o
17
18# Tell kbuild to always build the programs
19always := $(hostprogs-y)
20always += sockmap_kern.o
21
22HOSTLOADLIBES_sockmap += -lelf -lpthread
23
24# Allows pointing LLC/CLANG to a LLVM backend with bpf support, redefine on cmdline:
25# make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang
26LLC ?= llc
27CLANG ?= clang
28
29# Trick to allow make to be run from this directory
30all:
31 $(MAKE) -C ../../ $(CURDIR)/
32
33clean:
34 $(MAKE) -C ../../ M=$(CURDIR) clean
35 @rm -f *~
36
37$(obj)/syscall_nrs.s: $(src)/syscall_nrs.c
38 $(call if_changed_dep,cc_s_c)
39
40$(obj)/syscall_nrs.h: $(obj)/syscall_nrs.s FORCE
41 $(call filechk,offsets,__SYSCALL_NRS_H__)
42
43clean-files += syscall_nrs.h
44
45FORCE:
46
47
48# Verify LLVM compiler tools are available and bpf target is supported by llc
49.PHONY: verify_cmds verify_target_bpf $(CLANG) $(LLC)
50
51verify_cmds: $(CLANG) $(LLC)
52 @for TOOL in $^ ; do \
53 if ! (which -- "$${TOOL}" > /dev/null 2>&1); then \
54 echo "*** ERROR: Cannot find LLVM tool $${TOOL}" ;\
55 exit 1; \
56 else true; fi; \
57 done
58
59verify_target_bpf: verify_cmds
60 @if ! (${LLC} -march=bpf -mattr=help > /dev/null 2>&1); then \
61 echo "*** ERROR: LLVM (${LLC}) does not support 'bpf' target" ;\
62 echo " NOTICE: LLVM version >= 3.7.1 required" ;\
63 exit 2; \
64 else true; fi
65
66$(src)/*.c: verify_target_bpf
67
68# asm/sysreg.h - inline assembly used by it is incompatible with llvm.
69# But, there is no easy way to fix it, so just exclude it since it is
70# useless for BPF samples.
71$(obj)/%.o: $(src)/%.c
72 $(CLANG) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(EXTRA_CFLAGS) -I$(obj) \
73 -D__KERNEL__ -D__ASM_SYSREG_H -Wno-unused-value -Wno-pointer-sign \
74 -Wno-compare-distinct-pointer-types \
75 -Wno-gnu-variable-sized-type-not-at-end \
76 -Wno-address-of-packed-member -Wno-tautological-compare \
77 -Wno-unknown-warning-option \
78 -O2 -emit-llvm -c $< -o -| $(LLC) -march=bpf -filetype=obj -o $@