samples/sockmap/Makefile

   1 # kbuild trick to avoid linker error. Can be omitted if a module is built.
   2 obj- := dummy.o
   3
   4 # List of programs to build
   5 hostprogs-y := sockmap
   6
   7 # Libbpf dependencies
   8 LIBBPF := ../../tools/lib/bpf/bpf.o
   9
  10 HOSTCFLAGS += -I$(objtree)/usr/include
  11 HOSTCFLAGS += -I$(srctree)/tools/lib/
  12 HOSTCFLAGS += -I$(srctree)/tools/testing/selftests/bpf/
  13 HOSTCFLAGS += -I$(srctree)/tools/lib/ -I$(srctree)/tools/include
  14 HOSTCFLAGS += -I$(srctree)/tools/perf
  15
  16 sockmap-objs := ../bpf/bpf_load.o $(LIBBPF) sockmap_user.o
  17
  18 # Tell kbuild to always build the programs
  19 always := $(hostprogs-y)
  20 always += sockmap_kern.o
  21
  22 HOSTLOADLIBES_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
  26 LLC ?= llc
  27 CLANG ?= clang
  28
  29 # Trick to allow make to be run from this directory
  30 all:
  31         $(MAKE) -C ../../ $(CURDIR)/
  32
  33 clean:
  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
  43 clean-files += syscall_nrs.h
  44
  45 FORCE:
  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
  51 verify_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
  59 verify_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 $@