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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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RM ?= rmsrctree := $(realpath $(srctree))
VERSION_SCRIPT := libbpf.mapLIBBPF_VERSION := $(shell \ grep -oE '^LIBBPF_([0-9.]+)' $(VERSION_SCRIPT) | \ sort -rV | head -n1 | cut -d'_' -f2)LIBBPF_MAJOR_VERSION := $(word 1,$(subst ., ,$(LIBBPF_VERSION)))LIBBPF_MINOR_VERSION := $(word 2,$(subst ., ,$(LIBBPF_VERSION)))
MAKEFLAGS += --no-print-directory
# This will work when bpf is built in tools env. where srctree# isn't set and when invoked from selftests build, where srctree# is a ".". building_out_of_srctree is undefined for in srctree# buildsifndef building_out_of_srctreesrctree := $(patsubst %/,%,$(dir $(CURDIR)))srctree := $(patsubst %/,%,$(dir $(srctree)))srctree := $(patsubst %/,%,$(dir $(srctree)))#$(info Determined 'srctree' to be $(srctree))endif
INSTALL = install
# Use DESTDIR for installing into a different root directory.# This is useful for building a package. The program will be# installed in this directory as if it was the root directory.# Then the build tool can move it later.DESTDIR ?=DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
include $(srctree)/tools/scripts/Makefile.arch
ifeq ($(LP64), 1) libdir_relative = lib64else libdir_relative = libendif
prefix ?= /usr/locallibdir = $(prefix)/$(libdir_relative)man_dir = $(prefix)/share/manman_dir_SQ = '$(subst ','\'',$(man_dir))'
export man_dir man_dir_SQ INSTALLexport DESTDIR DESTDIR_SQ
# Defer assigning EXTRA_CFLAGS to CFLAGS until after including# tools/scripts/Makefile.include, as it may add flags to EXTRA_CFLAGS.ifdef EXTRA_CFLAGS CFLAGS :=else CFLAGS := -g -O2endif
include $(srctree)/tools/scripts/Makefile.include
# copy a bit from Linux kbuild
INCLUDES = -I$(or $(OUTPUT),.) \ -I$(srctree)/tools/include -I$(srctree)/tools/include/uapi \ -I$(srctree)/tools/arch/$(SRCARCH)/include
export prefix libdir src obj
# Shell quoteslibdir_SQ = $(subst ','\'',$(libdir))libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
OBJ = $@N =
LIB_TARGET = libbpf.a libbpf.so.$(LIBBPF_VERSION)LIB_FILE = libbpf.a libbpf.so*PC_FILE = libbpf.pc
# Append required CFLAGSoverride CFLAGS += -std=gnu89override CFLAGS += $(EXTRA_WARNINGS) -Wno-switch-enumoverride CFLAGS += -Werror -Walloverride CFLAGS += $(INCLUDES)override CFLAGS += -fvisibility=hiddenoverride CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64override CFLAGS += $(EXTRA_CFLAGS)
# flags specific for shared librarySHLIB_FLAGS := -DSHARED -fPIC
# Disable command line variables (CFLAGS) override from top# level Makefile (perf), otherwise build Makefile will get# the same command line setup.MAKEOVERRIDES=
all:
OUTPUT ?= ./OUTPUT := $(abspath $(OUTPUT))/export srctree OUTPUT CC LD CFLAGS Vinclude $(srctree)/tools/build/Makefile.include
SHARED_OBJDIR := $(OUTPUT)sharedobjs/STATIC_OBJDIR := $(OUTPUT)staticobjs/BPF_IN_SHARED := $(SHARED_OBJDIR)libbpf-in.oBPF_IN_STATIC := $(STATIC_OBJDIR)libbpf-in.oBPF_HELPER_DEFS := $(OUTPUT)bpf_helper_defs.hBPF_GENERATED := $(BPF_HELPER_DEFS)
LIB_TARGET := $(addprefix $(OUTPUT),$(LIB_TARGET))LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))PC_FILE := $(addprefix $(OUTPUT),$(PC_FILE))
TAGS_PROG := $(if $(shell which etags 2>/dev/null),etags,ctags)
GLOBAL_SYM_COUNT = $(shell $(HOSTREADELF) -s --wide $(BPF_IN_SHARED) | \ cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \ sed 's/\[.*\]//' | \ awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}' | \ sort -u | wc -l)VERSIONED_SYM_COUNT = $(shell $(HOSTREADELF) --dyn-syms --wide $(OUTPUT)libbpf.so | \ sed 's/\[.*\]//' | \ awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}' | \ grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l)
CMD_TARGETS = $(LIB_TARGET) $(PC_FILE)
all: fixdep $(Q)$(MAKE) all_cmd
all_cmd: $(CMD_TARGETS) check
$(SHARED_OBJDIR) $(STATIC_OBJDIR): $(Q)mkdir -p $@
$(BPF_IN_SHARED): force $(BPF_GENERATED) | $(SHARED_OBJDIR) @(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \ (diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \ echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true @(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \ (diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \ echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf_common.h' differs from latest version at 'include/uapi/linux/bpf_common.h'" >&2 )) || true @(test -f ../../include/uapi/linux/if_xdp.h -a -f ../../../include/uapi/linux/if_xdp.h && ( \ (diff -B ../../include/uapi/linux/if_xdp.h ../../../include/uapi/linux/if_xdp.h >/dev/null) || \ echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/if_xdp.h' differs from latest version at 'include/uapi/linux/if_xdp.h'" >&2 )) || true $(SILENT_MAKE) -C $(srctree)/tools/build CFLAGS= LDFLAGS= OUTPUT=$(SHARED_OBJDIR) $(SHARED_OBJDIR)fixdep $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(SHARED_OBJDIR) CFLAGS="$(CFLAGS) $(SHLIB_FLAGS)"
$(BPF_IN_STATIC): force $(BPF_GENERATED) | $(STATIC_OBJDIR) $(SILENT_MAKE) -C $(srctree)/tools/build CFLAGS= LDFLAGS= OUTPUT=$(STATIC_OBJDIR) $(STATIC_OBJDIR)fixdep $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(STATIC_OBJDIR)
$(BPF_HELPER_DEFS): $(srctree)/tools/include/uapi/linux/bpf.h $(QUIET_GEN)$(srctree)/scripts/bpf_doc.py --header \ --file $(srctree)/tools/include/uapi/linux/bpf.h > $(BPF_HELPER_DEFS)
$(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)
$(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN_SHARED) $(VERSION_SCRIPT) $(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) \ --shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \ -Wl,--version-script=$(VERSION_SCRIPT) $< -lelf -lz -o $@ @ln -sf $(@F) $(OUTPUT)libbpf.so @ln -sf $(@F) $(OUTPUT)libbpf.so.$(LIBBPF_MAJOR_VERSION)
$(OUTPUT)libbpf.a: $(BPF_IN_STATIC) $(QUIET_LINK)$(RM) -f $@; $(AR) rcs $@ $^
$(OUTPUT)libbpf.pc: $(QUIET_GEN)sed -e "s|@PREFIX@|$(prefix)|" \ -e "s|@LIBDIR@|$(libdir_SQ)|" \ -e "s|@VERSION@|$(LIBBPF_VERSION)|" \ < libbpf.pc.template > $@
check: check_abi check_version
check_abi: $(OUTPUT)libbpf.so $(VERSION_SCRIPT) @if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then \ echo "Warning: Num of global symbols in $(BPF_IN_SHARED)" \ "($(GLOBAL_SYM_COUNT)) does NOT match with num of" \ "versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \ "Please make sure all LIBBPF_API symbols are" \ "versioned in $(VERSION_SCRIPT)." >&2; \ $(HOSTREADELF) -s --wide $(BPF_IN_SHARED) | \ cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \ sed 's/\[.*\]//' | \ awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}'| \ sort -u > $(OUTPUT)libbpf_global_syms.tmp; \ $(HOSTREADELF) --dyn-syms --wide $(OUTPUT)libbpf.so | \ sed 's/\[.*\]//' | \ awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}'| \ grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | \ sort -u > $(OUTPUT)libbpf_versioned_syms.tmp; \ diff -u $(OUTPUT)libbpf_global_syms.tmp \ $(OUTPUT)libbpf_versioned_syms.tmp; \ rm $(OUTPUT)libbpf_global_syms.tmp \ $(OUTPUT)libbpf_versioned_syms.tmp; \ exit 1; \ fi
HDR_MAJ_VERSION := $(shell grep -oE '^$(pound)define LIBBPF_MAJOR_VERSION ([0-9]+)$$' libbpf_version.h | cut -d' ' -f3)HDR_MIN_VERSION := $(shell grep -oE '^$(pound)define LIBBPF_MINOR_VERSION ([0-9]+)$$' libbpf_version.h | cut -d' ' -f3)
check_version: $(VERSION_SCRIPT) libbpf_version.h @if [ "$(HDR_MAJ_VERSION)" != "$(LIBBPF_MAJOR_VERSION)" ]; then \ echo "Error: libbpf major version mismatch detected: " \ "'$(HDR_MAJ_VERSION)' != '$(LIBBPF_MAJOR_VERSION)'" >&2; \ exit 1; \ fi @if [ "$(HDR_MIN_VERSION)" != "$(LIBBPF_MINOR_VERSION)" ]; then \ echo "Error: libbpf minor version mismatch detected: " \ "'$(HDR_MIN_VERSION)' != '$(LIBBPF_MINOR_VERSION)'" >&2; \ exit 1; \ fi
define do_install_mkdir if [ ! -d '$(DESTDIR_SQ)$1' ]; then \ $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \ fiendef
define do_install if [ ! -d '$(DESTDIR_SQ)$2' ]; then \ $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \ fi; \ $(INSTALL) $(if $3,-m $3,) $1 '$(DESTDIR_SQ)$2'endef
install_lib: all_cmd $(call QUIET_INSTALL, $(LIB_TARGET)) \ $(call do_install_mkdir,$(libdir_SQ)); \ cp -fpR $(LIB_FILE) $(DESTDIR)$(libdir_SQ)
SRC_HDRS := bpf.h libbpf.h btf.h libbpf_common.h libbpf_legacy.h \ bpf_helpers.h bpf_tracing.h bpf_endian.h bpf_core_read.h \ skel_internal.h libbpf_version.h usdt.bpf.hGEN_HDRS := $(BPF_GENERATED)
INSTALL_PFX := $(DESTDIR)$(prefix)/include/bpfINSTALL_SRC_HDRS := $(addprefix $(INSTALL_PFX)/, $(SRC_HDRS))INSTALL_GEN_HDRS := $(addprefix $(INSTALL_PFX)/, $(notdir $(GEN_HDRS)))
$(INSTALL_SRC_HDRS): $(INSTALL_PFX)/%.h: %.h $(call QUIET_INSTALL, $@) \ $(call do_install,$<,$(prefix)/include/bpf,644)
$(INSTALL_GEN_HDRS): $(INSTALL_PFX)/%.h: $(OUTPUT)%.h $(call QUIET_INSTALL, $@) \ $(call do_install,$<,$(prefix)/include/bpf,644)
install_headers: $(BPF_GENERATED) $(INSTALL_SRC_HDRS) $(INSTALL_GEN_HDRS) $(call QUIET_INSTALL, libbpf_headers)
install_pkgconfig: $(PC_FILE) $(call QUIET_INSTALL, $(PC_FILE)) \ $(call do_install,$(PC_FILE),$(libdir_SQ)/pkgconfig,644)
install: install_lib install_pkgconfig install_headers
clean: fixdep-clean $(call QUIET_CLEAN, libbpf) $(RM) -rf $(CMD_TARGETS) \ *~ .*.d .*.cmd LIBBPF-CFLAGS $(BPF_GENERATED) \ $(SHARED_OBJDIR) $(STATIC_OBJDIR) \ $(addprefix $(OUTPUT), \ *.o *.a *.so *.so.$(LIBBPF_MAJOR_VERSION) *.pc)
PHONY += force cscope tags check check_abi check_versionforce:
cscope: ls *.c *.h > cscope.files cscope -b -q -I $(srctree)/include -f cscope.out
tags: $(RM) -f TAGS tags ls *.c *.h | xargs $(TAGS_PROG) -a
# Declare the contents of the .PHONY variable as phony. We keep that# information in a variable so we can use it in if_changed and friends..PHONY: $(PHONY)
# Delete partially updated (corrupted) files on error.DELETE_ON_ERROR:
help: @echo 'libbpf common targets:' @echo ' HINT: use "V=1" to enable verbose build' @echo ' all - build libraries and pkgconfig' @echo ' clean - remove all generated files' @echo ' check - check ABI and version info' @echo '' @echo 'libbpf install targets:' @echo ' HINT: use "prefix"(defaults to "/usr/local") or "DESTDIR" (defaults to "/")' @echo ' to adjust target destination, e.g. "make prefix=/usr/local install"' @echo ' install - build and install all headers, libraries and pkgconfig' @echo ' install_headers - install only headers to include/bpf' @echo '' @echo 'libbpf make targets:' @echo ' tags - use ctags to make tag information for source code browsing' @echo ' cscope - use cscope to make interactive source code browsing database'