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be79505caf
API headers from libbpf should not be accessed directly from the library's source directory. Instead, they should be exported with "make install_headers". Let's make sure that runqslower installs the headers properly when building. We use a libbpf_hdrs target to mark the logical dependency on libbpf's headers export for a number of object files, even though the headers should have been exported at this time (since bpftool needs them, and is required to generate the skeleton or the vmlinux.h). When descending from a parent Makefile, the specific output directories for building the library and exporting the headers are configurable with BPFOBJ_OUTPUT and BPF_DESTDIR, respectively. This is in addition to OUTPUT, on top of which those variables are constructed by default. Also adjust the Makefile for the BPF selftests. We pass a number of variables to the "make" invocation, because we want to point runqslower to the (target) libbpf shared with other tools, instead of building its own version. In addition, runqslower relies on (target) bpftool, and we also want to pass the proper variables to its Makefile so that bpftool itself reuses the same libbpf. Signed-off-by: Quentin Monnet <quentin@isovalent.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20211007194438.34443-6-quentin@isovalent.com
93 lines
2.8 KiB
Makefile
93 lines
2.8 KiB
Makefile
# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
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include ../../scripts/Makefile.include
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OUTPUT ?= $(abspath .output)/
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BPFTOOL_OUTPUT := $(OUTPUT)bpftool/
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DEFAULT_BPFTOOL := $(BPFTOOL_OUTPUT)bpftool
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BPFTOOL ?= $(DEFAULT_BPFTOOL)
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LIBBPF_SRC := $(abspath ../../lib/bpf)
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BPFOBJ_OUTPUT := $(OUTPUT)libbpf/
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BPFOBJ := $(BPFOBJ_OUTPUT)libbpf.a
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BPF_DESTDIR := $(BPFOBJ_OUTPUT)
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BPF_INCLUDE := $(BPF_DESTDIR)/include
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INCLUDES := -I$(OUTPUT) -I$(BPF_INCLUDE) -I$(abspath ../../include/uapi)
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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 := $(if $(O),$(O)/vmlinux) \
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$(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux) \
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../../../vmlinux /sys/kernel/btf/vmlinux \
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/boot/vmlinux-$(KERNEL_REL)
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VMLINUX_BTF_PATH := $(or $(VMLINUX_BTF),$(firstword \
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$(wildcard $(VMLINUX_BTF_PATHS))))
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ifeq ($(V),1)
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Q =
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else
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Q = @
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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 libbpf_hdrs
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all: runqslower
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runqslower: $(OUTPUT)/runqslower
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clean:
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$(call QUIET_CLEAN, runqslower)
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$(Q)$(RM) -r $(BPFOBJ_OUTPUT) $(BPFTOOL_OUTPUT)
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$(Q)$(RM) $(OUTPUT)*.o $(OUTPUT)*.d
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$(Q)$(RM) $(OUTPUT)*.skel.h $(OUTPUT)vmlinux.h
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$(Q)$(RM) $(OUTPUT)runqslower
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$(Q)$(RM) -r .output
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libbpf_hdrs: $(BPFOBJ)
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$(OUTPUT)/runqslower: $(OUTPUT)/runqslower.o $(BPFOBJ)
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$(QUIET_LINK)$(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 | libbpf_hdrs
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$(OUTPUT)/runqslower.bpf.o: $(OUTPUT)/vmlinux.h runqslower.h | libbpf_hdrs
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$(OUTPUT)/%.skel.h: $(OUTPUT)/%.bpf.o | $(BPFTOOL)
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$(QUIET_GEN)$(BPFTOOL) gen skeleton $< > $@
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$(OUTPUT)/%.bpf.o: %.bpf.c $(BPFOBJ) | $(OUTPUT)
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$(QUIET_GEN)$(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 | $(OUTPUT)
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$(QUIET_CC)$(CC) $(CFLAGS) $(INCLUDES) -c $(filter %.c,$^) -o $@
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$(OUTPUT) $(BPFOBJ_OUTPUT) $(BPFTOOL_OUTPUT):
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$(QUIET_MKDIR)mkdir -p $@
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$(OUTPUT)/vmlinux.h: $(VMLINUX_BTF_PATH) | $(OUTPUT) $(BPFTOOL)
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ifeq ($(VMLINUX_H),)
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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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$(QUIET_GEN)$(BPFTOOL) btf dump file $(VMLINUX_BTF_PATH) format c > $@
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else
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$(Q)cp "$(VMLINUX_H)" $@
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endif
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$(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(BPFOBJ_OUTPUT)
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$(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC) OUTPUT=$(BPFOBJ_OUTPUT) \
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DESTDIR=$(BPFOBJ_OUTPUT) prefix= $(abspath $@) install_headers
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$(DEFAULT_BPFTOOL): $(BPFOBJ) | $(BPFTOOL_OUTPUT)
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$(Q)$(MAKE) $(submake_extras) -C ../bpftool OUTPUT=$(BPFTOOL_OUTPUT) \
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LIBBPF_OUTPUT=$(BPFOBJ_OUTPUT) \
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LIBBPF_DESTDIR=$(BPF_DESTDIR) CC=$(HOSTCC) LD=$(HOSTLD)
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