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e2bad142bb
Commit25b146c5b8("kbuild: allow Kbuild to start from any directory") exported abs_srctree and abs_objtree to avoid recomputation after the sub-make. However, this approach turned out to be fragile. Commit5fa94ceb79("kbuild: set correct abs_srctree and abs_objtree for package builds") moved them above "ifneq ($(sub_make_done),1)", eliminating the need for exporting them. These are only needed in the top Makefile. If an absolute path is required in sub-directories, you can use $(abspath ) or $(realpath ) as needed. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
307 lines
11 KiB
Makefile
307 lines
11 KiB
Makefile
# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
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# Most of this file is copied from tools/lib/traceevent/Makefile
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RM ?= rm
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srctree := $(realpath $(srctree))
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VERSION_SCRIPT := libbpf.map
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LIBBPF_VERSION := $(shell \
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grep -oE '^LIBBPF_([0-9.]+)' $(VERSION_SCRIPT) | \
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sort -rV | head -n1 | cut -d'_' -f2)
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LIBBPF_MAJOR_VERSION := $(word 1,$(subst ., ,$(LIBBPF_VERSION)))
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LIBBPF_MINOR_VERSION := $(word 2,$(subst ., ,$(LIBBPF_VERSION)))
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MAKEFLAGS += --no-print-directory
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# This will work when bpf is built in tools env. where srctree
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# isn't set and when invoked from selftests build, where srctree
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# is a ".". building_out_of_srctree is undefined for in srctree
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# builds
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ifndef building_out_of_srctree
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srctree := $(patsubst %/,%,$(dir $(CURDIR)))
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srctree := $(patsubst %/,%,$(dir $(srctree)))
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srctree := $(patsubst %/,%,$(dir $(srctree)))
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#$(info Determined 'srctree' to be $(srctree))
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endif
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INSTALL = install
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# Use DESTDIR for installing into a different root directory.
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# This is useful for building a package. The program will be
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# installed in this directory as if it was the root directory.
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# Then the build tool can move it later.
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DESTDIR ?=
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DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
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include $(srctree)/tools/scripts/Makefile.arch
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ifeq ($(LP64), 1)
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libdir_relative = lib64
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else
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libdir_relative = lib
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endif
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prefix ?= /usr/local
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libdir = $(prefix)/$(libdir_relative)
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man_dir = $(prefix)/share/man
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man_dir_SQ = '$(subst ','\'',$(man_dir))'
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export man_dir man_dir_SQ INSTALL
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export DESTDIR DESTDIR_SQ
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include $(srctree)/tools/scripts/Makefile.include
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# copy a bit from Linux kbuild
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ifeq ("$(origin V)", "command line")
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VERBOSE = $(V)
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endif
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ifndef VERBOSE
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VERBOSE = 0
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endif
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INCLUDES = -I$(or $(OUTPUT),.) \
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-I$(srctree)/tools/include -I$(srctree)/tools/include/uapi
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export prefix libdir src obj
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# Shell quotes
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libdir_SQ = $(subst ','\'',$(libdir))
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libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
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OBJ = $@
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N =
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LIB_TARGET = libbpf.a libbpf.so.$(LIBBPF_VERSION)
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LIB_FILE = libbpf.a libbpf.so*
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PC_FILE = libbpf.pc
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# Set compile option CFLAGS
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ifdef EXTRA_CFLAGS
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CFLAGS := $(EXTRA_CFLAGS)
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else
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CFLAGS := -g -O2
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endif
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# Append required CFLAGS
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override CFLAGS += -std=gnu89
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override CFLAGS += $(EXTRA_WARNINGS) -Wno-switch-enum
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override CFLAGS += -Werror -Wall
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override CFLAGS += $(INCLUDES)
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override CFLAGS += -fvisibility=hidden
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override CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
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override CFLAGS += $(CLANG_CROSS_FLAGS)
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# flags specific for shared library
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SHLIB_FLAGS := -DSHARED -fPIC
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ifeq ($(VERBOSE),1)
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Q =
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else
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Q = @
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endif
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# Disable command line variables (CFLAGS) override from top
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# level Makefile (perf), otherwise build Makefile will get
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# the same command line setup.
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MAKEOVERRIDES=
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all:
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export srctree OUTPUT CC LD CFLAGS V
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include $(srctree)/tools/build/Makefile.include
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SHARED_OBJDIR := $(OUTPUT)sharedobjs/
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STATIC_OBJDIR := $(OUTPUT)staticobjs/
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BPF_IN_SHARED := $(SHARED_OBJDIR)libbpf-in.o
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BPF_IN_STATIC := $(STATIC_OBJDIR)libbpf-in.o
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BPF_HELPER_DEFS := $(OUTPUT)bpf_helper_defs.h
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BPF_GENERATED := $(BPF_HELPER_DEFS)
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LIB_TARGET := $(addprefix $(OUTPUT),$(LIB_TARGET))
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LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))
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PC_FILE := $(addprefix $(OUTPUT),$(PC_FILE))
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TAGS_PROG := $(if $(shell which etags 2>/dev/null),etags,ctags)
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GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN_SHARED) | \
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cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \
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sed 's/\[.*\]//' | \
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awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}' | \
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sort -u | wc -l)
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VERSIONED_SYM_COUNT = $(shell readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \
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sed 's/\[.*\]//' | \
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awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}' | \
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grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l)
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CMD_TARGETS = $(LIB_TARGET) $(PC_FILE)
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all: fixdep
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$(Q)$(MAKE) all_cmd
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all_cmd: $(CMD_TARGETS) check
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$(BPF_IN_SHARED): force $(BPF_GENERATED)
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@(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \
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(diff -B ../../include/uapi/linux/bpf.h ../../../include/uapi/linux/bpf.h >/dev/null) || \
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echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'" >&2 )) || true
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@(test -f ../../include/uapi/linux/bpf_common.h -a -f ../../../include/uapi/linux/bpf_common.h && ( \
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(diff -B ../../include/uapi/linux/bpf_common.h ../../../include/uapi/linux/bpf_common.h >/dev/null) || \
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echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf_common.h' differs from latest version at 'include/uapi/linux/bpf_common.h'" >&2 )) || true
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@(test -f ../../include/uapi/linux/if_xdp.h -a -f ../../../include/uapi/linux/if_xdp.h && ( \
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(diff -B ../../include/uapi/linux/if_xdp.h ../../../include/uapi/linux/if_xdp.h >/dev/null) || \
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echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/if_xdp.h' differs from latest version at 'include/uapi/linux/if_xdp.h'" >&2 )) || true
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$(Q)$(MAKE) $(build)=libbpf OUTPUT=$(SHARED_OBJDIR) CFLAGS="$(CFLAGS) $(SHLIB_FLAGS)"
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$(BPF_IN_STATIC): force $(BPF_GENERATED)
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$(Q)$(MAKE) $(build)=libbpf OUTPUT=$(STATIC_OBJDIR)
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$(BPF_HELPER_DEFS): $(srctree)/tools/include/uapi/linux/bpf.h
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$(QUIET_GEN)$(srctree)/scripts/bpf_doc.py --header \
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--file $(srctree)/tools/include/uapi/linux/bpf.h > $(BPF_HELPER_DEFS)
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$(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)
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$(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN_SHARED) $(VERSION_SCRIPT)
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$(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) \
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--shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \
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-Wl,--version-script=$(VERSION_SCRIPT) $< -lelf -lz -o $@
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@ln -sf $(@F) $(OUTPUT)libbpf.so
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@ln -sf $(@F) $(OUTPUT)libbpf.so.$(LIBBPF_MAJOR_VERSION)
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$(OUTPUT)libbpf.a: $(BPF_IN_STATIC)
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$(QUIET_LINK)$(RM) -f $@; $(AR) rcs $@ $^
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$(OUTPUT)libbpf.pc:
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$(QUIET_GEN)sed -e "s|@PREFIX@|$(prefix)|" \
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-e "s|@LIBDIR@|$(libdir_SQ)|" \
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-e "s|@VERSION@|$(LIBBPF_VERSION)|" \
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< libbpf.pc.template > $@
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check: check_abi check_version
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check_abi: $(OUTPUT)libbpf.so $(VERSION_SCRIPT)
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@if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then \
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echo "Warning: Num of global symbols in $(BPF_IN_SHARED)" \
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"($(GLOBAL_SYM_COUNT)) does NOT match with num of" \
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"versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \
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"Please make sure all LIBBPF_API symbols are" \
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"versioned in $(VERSION_SCRIPT)." >&2; \
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readelf -s --wide $(BPF_IN_SHARED) | \
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cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \
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sed 's/\[.*\]//' | \
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awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}'| \
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sort -u > $(OUTPUT)libbpf_global_syms.tmp; \
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readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \
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sed 's/\[.*\]//' | \
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awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}'| \
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grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | \
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sort -u > $(OUTPUT)libbpf_versioned_syms.tmp; \
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diff -u $(OUTPUT)libbpf_global_syms.tmp \
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$(OUTPUT)libbpf_versioned_syms.tmp; \
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rm $(OUTPUT)libbpf_global_syms.tmp \
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$(OUTPUT)libbpf_versioned_syms.tmp; \
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exit 1; \
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fi
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HDR_MAJ_VERSION := $(shell grep -oE '^$(pound)define LIBBPF_MAJOR_VERSION ([0-9]+)$$' libbpf_version.h | cut -d' ' -f3)
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HDR_MIN_VERSION := $(shell grep -oE '^$(pound)define LIBBPF_MINOR_VERSION ([0-9]+)$$' libbpf_version.h | cut -d' ' -f3)
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check_version: $(VERSION_SCRIPT) libbpf_version.h
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@if [ "$(HDR_MAJ_VERSION)" != "$(LIBBPF_MAJOR_VERSION)" ]; then \
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echo "Error: libbpf major version mismatch detected: " \
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"'$(HDR_MAJ_VERSION)' != '$(LIBBPF_MAJOR_VERSION)'" >&2; \
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exit 1; \
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fi
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@if [ "$(HDR_MIN_VERSION)" != "$(LIBBPF_MINOR_VERSION)" ]; then \
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echo "Error: libbpf minor version mismatch detected: " \
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"'$(HDR_MIN_VERSION)' != '$(LIBBPF_MINOR_VERSION)'" >&2; \
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exit 1; \
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fi
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define do_install_mkdir
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if [ ! -d '$(DESTDIR_SQ)$1' ]; then \
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$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \
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fi
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endef
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define do_install
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if [ ! -d '$(DESTDIR_SQ)$2' ]; then \
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$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
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fi; \
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$(INSTALL) $(if $3,-m $3,) $1 '$(DESTDIR_SQ)$2'
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endef
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install_lib: all_cmd
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$(call QUIET_INSTALL, $(LIB_TARGET)) \
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$(call do_install_mkdir,$(libdir_SQ)); \
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cp -fpR $(LIB_FILE) $(DESTDIR)$(libdir_SQ)
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SRC_HDRS := bpf.h libbpf.h btf.h libbpf_common.h libbpf_legacy.h \
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bpf_helpers.h bpf_tracing.h bpf_endian.h bpf_core_read.h \
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skel_internal.h libbpf_version.h usdt.bpf.h
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GEN_HDRS := $(BPF_GENERATED)
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INSTALL_PFX := $(DESTDIR)$(prefix)/include/bpf
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INSTALL_SRC_HDRS := $(addprefix $(INSTALL_PFX)/, $(SRC_HDRS))
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INSTALL_GEN_HDRS := $(addprefix $(INSTALL_PFX)/, $(notdir $(GEN_HDRS)))
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$(INSTALL_SRC_HDRS): $(INSTALL_PFX)/%.h: %.h
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$(call QUIET_INSTALL, $@) \
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$(call do_install,$<,$(prefix)/include/bpf,644)
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$(INSTALL_GEN_HDRS): $(INSTALL_PFX)/%.h: $(OUTPUT)%.h
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$(call QUIET_INSTALL, $@) \
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$(call do_install,$<,$(prefix)/include/bpf,644)
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install_headers: $(BPF_GENERATED) $(INSTALL_SRC_HDRS) $(INSTALL_GEN_HDRS)
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$(call QUIET_INSTALL, libbpf_headers)
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install_pkgconfig: $(PC_FILE)
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$(call QUIET_INSTALL, $(PC_FILE)) \
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$(call do_install,$(PC_FILE),$(libdir_SQ)/pkgconfig,644)
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install: install_lib install_pkgconfig install_headers
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clean:
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$(call QUIET_CLEAN, libbpf) $(RM) -rf $(CMD_TARGETS) \
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*~ .*.d .*.cmd LIBBPF-CFLAGS $(BPF_GENERATED) \
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$(SHARED_OBJDIR) $(STATIC_OBJDIR) \
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$(addprefix $(OUTPUT), \
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*.o *.a *.so *.so.$(LIBBPF_MAJOR_VERSION) *.pc)
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PHONY += force cscope tags check check_abi check_version
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force:
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cscope:
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ls *.c *.h > cscope.files
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cscope -b -q -I $(srctree)/include -f cscope.out
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tags:
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$(RM) -f TAGS tags
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ls *.c *.h | xargs $(TAGS_PROG) -a
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# Declare the contents of the .PHONY variable as phony. We keep that
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# information in a variable so we can use it in if_changed and friends.
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.PHONY: $(PHONY)
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# Delete partially updated (corrupted) files on error
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.DELETE_ON_ERROR:
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help:
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@echo 'libbpf common targets:'
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@echo ' HINT: use "V=1" to enable verbose build'
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@echo ' all - build libraries and pkgconfig'
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@echo ' clean - remove all generated files'
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@echo ' check - check ABI and version info'
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@echo ''
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@echo 'libbpf install targets:'
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@echo ' HINT: use "prefix"(defaults to "/usr/local") or "DESTDIR" (defaults to "/")'
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@echo ' to adjust target destination, e.g. "make prefix=/usr/local install"'
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@echo ' install - build and install all headers, libraries and pkgconfig'
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@echo ' install_headers - install only headers to include/bpf'
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@echo ''
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@echo 'libbpf make targets:'
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@echo ' tags - use ctags to make tag information for source code browsing'
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@echo ' cscope - use cscope to make interactive source code browsing database'
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