fc9e34f8de
Add missing dependency of $(BPFOBJ) to $(LIBBPF_SRC), so that running make
in runqslower/ will rebuild libbpf.a when there is change in libbpf/.
Fixes: 9c01546d26 ("tools/bpf: Add runqslower tool to tools/bpf")
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200204215037.2258698-1-songliubraving@fb.com
85 lines
2.3 KiB
Makefile
85 lines
2.3 KiB
Makefile
# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
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OUTPUT := .output
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CLANG ?= clang
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LLC ?= llc
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LLVM_STRIP ?= llvm-strip
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DEFAULT_BPFTOOL := $(OUTPUT)/sbin/bpftool
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BPFTOOL ?= $(DEFAULT_BPFTOOL)
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LIBBPF_SRC := $(abspath ../../lib/bpf)
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BPFOBJ := $(OUTPUT)/libbpf.a
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BPF_INCLUDE := $(OUTPUT)
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INCLUDES := -I$(BPF_INCLUDE) -I$(OUTPUT) -I$(abspath ../../lib)
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CFLAGS := -g -Wall
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# Try to detect best kernel BTF source
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KERNEL_REL := $(shell uname -r)
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VMLINUX_BTF_PATHS := /sys/kernel/btf/vmlinux /boot/vmlinux-$(KERNEL_REL)
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VMLINUX_BTF_PATH := $(or $(VMLINUX_BTF),$(firstword \
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$(wildcard $(VMLINUX_BTF_PATHS))))
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abs_out := $(abspath $(OUTPUT))
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ifeq ($(V),1)
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Q =
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msg =
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else
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Q = @
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msg = @printf ' %-8s %s%s\n' "$(1)" "$(notdir $(2))" "$(if $(3), $(3))";
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MAKEFLAGS += --no-print-directory
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submake_extras := feature_display=0
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endif
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.DELETE_ON_ERROR:
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.PHONY: all clean runqslower
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all: runqslower
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runqslower: $(OUTPUT)/runqslower
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clean:
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$(call msg,CLEAN)
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$(Q)rm -rf $(OUTPUT) runqslower
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$(OUTPUT)/runqslower: $(OUTPUT)/runqslower.o $(BPFOBJ)
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$(call msg,BINARY,$@)
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$(Q)$(CC) $(CFLAGS) $^ -lelf -lz -o $@
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$(OUTPUT)/runqslower.o: runqslower.h $(OUTPUT)/runqslower.skel.h \
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$(OUTPUT)/runqslower.bpf.o
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$(OUTPUT)/runqslower.bpf.o: $(OUTPUT)/vmlinux.h runqslower.h
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$(OUTPUT)/%.skel.h: $(OUTPUT)/%.bpf.o | $(BPFTOOL)
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$(call msg,GEN-SKEL,$@)
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$(Q)$(BPFTOOL) gen skeleton $< > $@
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$(OUTPUT)/%.bpf.o: %.bpf.c $(BPFOBJ) | $(OUTPUT)
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$(call msg,BPF,$@)
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$(Q)$(CLANG) -g -O2 -target bpf $(INCLUDES) \
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-c $(filter %.c,$^) -o $@ && \
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$(LLVM_STRIP) -g $@
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$(OUTPUT)/%.o: %.c | $(OUTPUT)
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$(call msg,CC,$@)
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$(Q)$(CC) $(CFLAGS) $(INCLUDES) -c $(filter %.c,$^) -o $@
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$(OUTPUT):
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$(call msg,MKDIR,$@)
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$(Q)mkdir -p $(OUTPUT)
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$(OUTPUT)/vmlinux.h: $(VMLINUX_BTF_PATH) | $(OUTPUT) $(BPFTOOL)
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$(call msg,GEN,$@)
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$(Q)if [ ! -e "$(VMLINUX_BTF_PATH)" ] ; then \
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echo "Couldn't find kernel BTF; set VMLINUX_BTF to" \
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"specify its location." >&2; \
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exit 1;\
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fi
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$(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF_PATH) format c > $@
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$(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(OUTPUT)
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$(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC) \
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OUTPUT=$(abspath $(dir $@))/ $(abspath $@)
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$(DEFAULT_BPFTOOL):
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$(Q)$(MAKE) $(submake_extras) -C ../bpftool \
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prefix= OUTPUT=$(abs_out)/ DESTDIR=$(abs_out) install
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