79 lines
2.3 KiB
Makefile
79 lines
2.3 KiB
Makefile
# kbuild trick to avoid linker error. Can be omitted if a module is built.
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obj- := dummy.o
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# List of programs to build
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hostprogs-y := sockmap
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# Libbpf dependencies
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LIBBPF := ../../tools/lib/bpf/bpf.o
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HOSTCFLAGS += -I$(objtree)/usr/include
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HOSTCFLAGS += -I$(srctree)/tools/lib/
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HOSTCFLAGS += -I$(srctree)/tools/testing/selftests/bpf/
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HOSTCFLAGS += -I$(srctree)/tools/lib/ -I$(srctree)/tools/include
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HOSTCFLAGS += -I$(srctree)/tools/perf
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sockmap-objs := ../bpf/bpf_load.o $(LIBBPF) sockmap_user.o
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# Tell kbuild to always build the programs
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always := $(hostprogs-y)
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always += sockmap_kern.o
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HOSTLOADLIBES_sockmap += -lelf -lpthread
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# Allows pointing LLC/CLANG to a LLVM backend with bpf support, redefine on cmdline:
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# make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang
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LLC ?= llc
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CLANG ?= clang
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# Trick to allow make to be run from this directory
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all:
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$(MAKE) -C ../../ $(CURDIR)/
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clean:
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$(MAKE) -C ../../ M=$(CURDIR) clean
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@rm -f *~
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$(obj)/syscall_nrs.s: $(src)/syscall_nrs.c
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$(call if_changed_dep,cc_s_c)
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$(obj)/syscall_nrs.h: $(obj)/syscall_nrs.s FORCE
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$(call filechk,offsets,__SYSCALL_NRS_H__)
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clean-files += syscall_nrs.h
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FORCE:
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# Verify LLVM compiler tools are available and bpf target is supported by llc
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.PHONY: verify_cmds verify_target_bpf $(CLANG) $(LLC)
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verify_cmds: $(CLANG) $(LLC)
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@for TOOL in $^ ; do \
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if ! (which -- "$${TOOL}" > /dev/null 2>&1); then \
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echo "*** ERROR: Cannot find LLVM tool $${TOOL}" ;\
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exit 1; \
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else true; fi; \
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done
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verify_target_bpf: verify_cmds
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@if ! (${LLC} -march=bpf -mattr=help > /dev/null 2>&1); then \
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echo "*** ERROR: LLVM (${LLC}) does not support 'bpf' target" ;\
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echo " NOTICE: LLVM version >= 3.7.1 required" ;\
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exit 2; \
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else true; fi
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$(src)/*.c: verify_target_bpf
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# asm/sysreg.h - inline assembly used by it is incompatible with llvm.
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# But, there is no easy way to fix it, so just exclude it since it is
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# useless for BPF samples.
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$(obj)/%.o: $(src)/%.c
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$(CLANG) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(EXTRA_CFLAGS) -I$(obj) \
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-D__KERNEL__ -D__ASM_SYSREG_H -Wno-unused-value -Wno-pointer-sign \
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-Wno-compare-distinct-pointer-types \
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-Wno-gnu-variable-sized-type-not-at-end \
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-Wno-address-of-packed-member -Wno-tautological-compare \
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-Wno-unknown-warning-option \
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-O2 -emit-llvm -c $< -o -| $(LLC) -march=bpf -filetype=obj -o $@
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