Commit 9778cfdf authored by Taeung Song's avatar Taeung Song Committed by Daniel Borkmann
Browse files

samples/bpf: Add BTF build flags to Makefile 



To smoothly test BTF supported binary on samples/bpf,
let samples/bpf/Makefile probe llc, pahole and
llvm-objcopy for BPF support and use them
like tools/testing/selftests/bpf/Makefile
changed from the commit c0fa1b6c ("bpf: btf:
Add BTF tests").

Signed-off-by: default avatarTaeung Song <treeze.taeung@gmail.com>
Acked-by: default avatarMartin KaFai Lau <kafai@fb.com>
Reviewed-by: default avatarJakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
parent 598135e7

samples/bpf/Makefile

+16 −1
Original line number Diff line number Diff line
@@ -195,6 +195,8 @@ HOSTLOADLIBES_xdpsock += -pthread 
#  make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang

LLC ?= llc

CLANG ?= clang

LLVM_OBJCOPY ?= llvm-objcopy

BTF_PAHOLE ?= pahole



# Detect that we're cross compiling and use the cross compiler

ifdef CROSS_COMPILE
@@ -202,6 +204,16 @@ HOSTCC = $(CROSS_COMPILE)gcc 
CLANG_ARCH_ARGS = -target $(ARCH)

endif



BTF_LLC_PROBE := $(shell $(LLC) -march=bpf -mattr=help 2>&1 | grep dwarfris)

BTF_PAHOLE_PROBE := $(shell $(BTF_PAHOLE) --help 2>&1 | grep BTF)

BTF_OBJCOPY_PROBE := $(shell $(LLVM_OBJCOPY) --help 2>&1 | grep -i 'usage.*llvm')



ifneq ($(and $(BTF_LLC_PROBE),$(BTF_PAHOLE_PROBE),$(BTF_OBJCOPY_PROBE)),)

	EXTRA_CFLAGS += -g

	LLC_FLAGS += -mattr=dwarfris

	DWARF2BTF = y

endif



# Trick to allow make to be run from this directory

all:

	$(MAKE) -C ../../ $(CURDIR)/ BPF_SAMPLES_PATH=$(CURDIR)
@@ -260,4 +272,7 @@ $(obj)/%.o: $(src)/%.c 
		-Wno-gnu-variable-sized-type-not-at-end \

		-Wno-address-of-packed-member -Wno-tautological-compare \

		-Wno-unknown-warning-option $(CLANG_ARCH_ARGS) \

		-O2 -emit-llvm -c $< -o -| $(LLC) -march=bpf -filetype=obj -o $@
 
		-O2 -emit-llvm -c $< -o -| $(LLC) -march=bpf $(LLC_FLAGS) -filetype=obj -o $@

ifeq ($(DWARF2BTF),y)

	$(BTF_PAHOLE) -J $@

endif

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