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tools/bpftool: Fix cross-build
The bpftool build first creates an intermediate binary, executed on the host, to generate skeletons required by the final build. When cross-building bpftool for an architecture different from the host, the intermediate binary should be built using the host compiler (gcc) and the final bpftool using the cross compiler (e.g. aarch64-linux-gnu-gcc). Generate the intermediate objects into the bootstrap/ directory using the host toolchain. Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20201110164310.2600671-4-jean-philippe@linaro.org
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@ -19,24 +19,37 @@ BPF_DIR = $(srctree)/tools/lib/bpf/
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ifneq ($(OUTPUT),)
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LIBBPF_OUTPUT = $(OUTPUT)/libbpf/
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LIBBPF_PATH = $(LIBBPF_OUTPUT)
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BOOTSTRAP_OUTPUT = $(OUTPUT)/bootstrap/
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else
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LIBBPF_OUTPUT =
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LIBBPF_PATH = $(BPF_DIR)
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BOOTSTRAP_OUTPUT = $(CURDIR)/bootstrap/
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endif
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LIBBPF = $(LIBBPF_PATH)libbpf.a
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LIBBPF_BOOTSTRAP_OUTPUT = $(BOOTSTRAP_OUTPUT)libbpf/
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LIBBPF_BOOTSTRAP = $(LIBBPF_BOOTSTRAP_OUTPUT)libbpf.a
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BPFTOOL_VERSION ?= $(shell make -rR --no-print-directory -sC ../../.. kernelversion)
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$(LIBBPF_OUTPUT):
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$(LIBBPF_OUTPUT) $(BOOTSTRAP_OUTPUT) $(LIBBPF_BOOTSTRAP_OUTPUT):
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$(QUIET_MKDIR)mkdir -p $@
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$(LIBBPF): FORCE | $(LIBBPF_OUTPUT)
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$(Q)$(MAKE) -C $(BPF_DIR) OUTPUT=$(LIBBPF_OUTPUT) $(LIBBPF_OUTPUT)libbpf.a
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$(LIBBPF_BOOTSTRAP): FORCE | $(LIBBPF_BOOTSTRAP_OUTPUT)
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$(Q)$(MAKE) -C $(BPF_DIR) OUTPUT=$(LIBBPF_BOOTSTRAP_OUTPUT) \
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ARCH= CC=$(HOSTCC) LD=$(HOSTLD) $@
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$(LIBBPF)-clean: $(LIBBPF_OUTPUT)
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$(call QUIET_CLEAN, libbpf)
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$(Q)$(MAKE) -C $(BPF_DIR) OUTPUT=$(LIBBPF_OUTPUT) clean >/dev/null
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$(LIBBPF_BOOTSTRAP)-clean: $(LIBBPF_BOOTSTRAP_OUTPUT)
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$(call QUIET_CLEAN, libbpf-bootstrap)
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$(Q)$(MAKE) -C $(BPF_DIR) OUTPUT=$(LIBBPF_BOOTSTRAP_OUTPUT) clean >/dev/null
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prefix ?= /usr/local
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bash_compdir ?= /usr/share/bash-completion/completions
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@ -94,6 +107,7 @@ CFLAGS += -DCOMPAT_NEED_REALLOCARRAY
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endif
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LIBS = $(LIBBPF) -lelf -lz
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LIBS_BOOTSTRAP = $(LIBBPF_BOOTSTRAP) -lelf -lz
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ifeq ($(feature-libcap), 1)
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CFLAGS += -DUSE_LIBCAP
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LIBS += -lcap
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@ -120,9 +134,9 @@ CFLAGS += -DHAVE_LIBBFD_SUPPORT
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SRCS += $(BFD_SRCS)
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endif
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BPFTOOL_BOOTSTRAP := $(if $(OUTPUT),$(OUTPUT)bpftool-bootstrap,./bpftool-bootstrap)
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BPFTOOL_BOOTSTRAP := $(BOOTSTRAP_OUTPUT)bpftool
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BOOTSTRAP_OBJS = $(addprefix $(OUTPUT),main.o common.o json_writer.o gen.o btf.o)
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BOOTSTRAP_OBJS = $(addprefix $(BOOTSTRAP_OUTPUT),main.o common.o json_writer.o gen.o btf.o)
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OBJS = $(patsubst %.c,$(OUTPUT)%.o,$(SRCS)) $(OUTPUT)disasm.o
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VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux) \
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@ -169,12 +183,16 @@ $(OUTPUT)disasm.o: $(srctree)/kernel/bpf/disasm.c
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$(OUTPUT)feature.o: | zdep
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$(BPFTOOL_BOOTSTRAP): $(BOOTSTRAP_OBJS) $(LIBBPF)
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$(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(BOOTSTRAP_OBJS) $(LIBS)
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$(BPFTOOL_BOOTSTRAP): $(BOOTSTRAP_OBJS) $(LIBBPF_BOOTSTRAP)
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$(QUIET_LINK)$(HOSTCC) $(CFLAGS) $(LDFLAGS) -o $@ $(BOOTSTRAP_OBJS) \
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$(LIBS_BOOTSTRAP)
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$(OUTPUT)bpftool: $(OBJS) $(LIBBPF)
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$(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(OBJS) $(LIBS)
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$(BOOTSTRAP_OUTPUT)%.o: %.c | $(BOOTSTRAP_OUTPUT)
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$(QUIET_CC)$(HOSTCC) $(CFLAGS) -c -MMD -o $@ $<
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$(OUTPUT)%.o: %.c
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$(QUIET_CC)$(CC) $(CFLAGS) -c -MMD -o $@ $<
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@ -182,11 +200,11 @@ feature-detect-clean:
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$(call QUIET_CLEAN, feature-detect)
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$(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null
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clean: $(LIBBPF)-clean feature-detect-clean
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clean: $(LIBBPF)-clean $(LIBBPF_BOOTSTRAP)-clean feature-detect-clean
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$(call QUIET_CLEAN, bpftool)
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$(Q)$(RM) -- $(OUTPUT)bpftool $(OUTPUT)*.o $(OUTPUT)*.d
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$(Q)$(RM) -- $(BPFTOOL_BOOTSTRAP) $(OUTPUT)*.skel.h $(OUTPUT)vmlinux.h
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$(Q)$(RM) -r -- $(OUTPUT)libbpf/
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$(Q)$(RM) -- $(OUTPUT)*.skel.h $(OUTPUT)vmlinux.h
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$(Q)$(RM) -r -- $(LIBBPF_OUTPUT) $(BOOTSTRAP_OUTPUT)
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$(call QUIET_CLEAN, core-gen)
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$(Q)$(RM) -- $(OUTPUT)FEATURE-DUMP.bpftool
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$(Q)$(RM) -r -- $(OUTPUT)feature/
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