forked from Minki/linux
9efc779449
It's easy to have a mismatch of "intended to be public" vs really exposed API functions. While Makefile does check for this mismatch, if it actually occurs it's not trivial to determine which functions are accidentally exposed. This patch dumps out a diff showing what's not supposed to be exposed facilitating easier fixing. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
277 lines
8.5 KiB
Makefile
277 lines
8.5 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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BPF_VERSION = 0
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BPF_PATCHLEVEL = 0
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BPF_EXTRAVERSION = 3
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MAKEFLAGS += --no-print-directory
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ifeq ($(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 = $(V)
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endif
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ifndef VERBOSE
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VERBOSE = 0
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endif
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FEATURE_USER = .libbpf
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FEATURE_TESTS = libelf libelf-mmap bpf reallocarray cxx
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FEATURE_DISPLAY = libelf bpf
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INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/tools/arch/$(ARCH)/include/uapi -I$(srctree)/tools/include/uapi
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FEATURE_CHECK_CFLAGS-bpf = $(INCLUDES)
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check_feat := 1
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NON_CHECK_FEAT_TARGETS := clean TAGS tags cscope help
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ifdef MAKECMDGOALS
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ifeq ($(filter-out $(NON_CHECK_FEAT_TARGETS),$(MAKECMDGOALS)),)
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check_feat := 0
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endif
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endif
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ifeq ($(check_feat),1)
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ifeq ($(FEATURES_DUMP),)
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include $(srctree)/tools/build/Makefile.feature
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else
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include $(FEATURES_DUMP)
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endif
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endif
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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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VERSION = $(BPF_VERSION)
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PATCHLEVEL = $(BPF_PATCHLEVEL)
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EXTRAVERSION = $(BPF_EXTRAVERSION)
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OBJ = $@
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N =
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LIBBPF_VERSION = $(BPF_VERSION).$(BPF_PATCHLEVEL).$(BPF_EXTRAVERSION)
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LIB_TARGET = libbpf.a libbpf.so.$(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 := $(EXTRA_CFLAGS)
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else
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CFLAGS := -g -Wall
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endif
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ifeq ($(feature-libelf-mmap), 1)
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override CFLAGS += -DHAVE_LIBELF_MMAP_SUPPORT
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endif
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ifeq ($(feature-reallocarray), 0)
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override CFLAGS += -DCOMPAT_NEED_REALLOCARRAY
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endif
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# Append required CFLAGS
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override CFLAGS += $(EXTRA_WARNINGS)
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override CFLAGS += -Werror -Wall
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override CFLAGS += -fPIC
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override CFLAGS += $(INCLUDES)
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override CFLAGS += -fvisibility=hidden
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ifeq ($(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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BPF_IN := $(OUTPUT)libbpf-in.o
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VERSION_SCRIPT := libbpf.map
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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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GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN) | \
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awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {s++} END{print s}')
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VERSIONED_SYM_COUNT = $(shell readelf -s --wide $(OUTPUT)libbpf.so | \
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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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CXX_TEST_TARGET = $(OUTPUT)test_libbpf
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ifeq ($(feature-cxx), 1)
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CMD_TARGETS += $(CXX_TEST_TARGET)
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endif
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TARGETS = $(CMD_TARGETS)
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all: fixdep
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$(Q)$(MAKE) all_cmd
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all_cmd: $(CMD_TARGETS) check
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$(BPF_IN): force elfdep bpfdep
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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/netlink.h -a -f ../../../include/uapi/linux/netlink.h && ( \
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(diff -B ../../include/uapi/linux/netlink.h ../../../include/uapi/linux/netlink.h >/dev/null) || \
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echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/netlink.h' differs from latest version at 'include/uapi/linux/netlink.h'" >&2 )) || true
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@(test -f ../../include/uapi/linux/if_link.h -a -f ../../../include/uapi/linux/if_link.h && ( \
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(diff -B ../../include/uapi/linux/if_link.h ../../../include/uapi/linux/if_link.h >/dev/null) || \
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echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/if_link.h' differs from latest version at 'include/uapi/linux/if_link.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) $(build)=libbpf
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$(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)
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$(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN)
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$(QUIET_LINK)$(CC) --shared -Wl,-soname,libbpf.so.$(VERSION) \
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-Wl,--version-script=$(VERSION_SCRIPT) $^ -lelf -o $@
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@ln -sf $(@F) $(OUTPUT)libbpf.so
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@ln -sf $(@F) $(OUTPUT)libbpf.so.$(VERSION)
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$(OUTPUT)libbpf.a: $(BPF_IN)
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$(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^
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$(OUTPUT)test_libbpf: test_libbpf.cpp $(OUTPUT)libbpf.a
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$(QUIET_LINK)$(CXX) $(INCLUDES) $^ -lelf -o $@
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$(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
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check_abi: $(OUTPUT)libbpf.so
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@if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then \
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echo "Warning: Num of global symbols in $(BPF_IN)" \
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"($(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 $(OUTPUT)libbpf-in.o | \
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awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$8}'| \
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sort -u > $(OUTPUT)libbpf_global_syms.tmp; \
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readelf -s --wide $(OUTPUT)libbpf.so | \
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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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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) $1 $(if $3,-m $3,) '$(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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install_headers:
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$(call QUIET_INSTALL, headers) \
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$(call do_install,bpf.h,$(prefix)/include/bpf,644); \
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$(call do_install,libbpf.h,$(prefix)/include/bpf,644); \
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$(call do_install,btf.h,$(prefix)/include/bpf,644); \
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$(call do_install,libbpf_util.h,$(prefix)/include/bpf,644); \
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$(call do_install,xsk.h,$(prefix)/include/bpf,644);
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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
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### Cleaning rules
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config-clean:
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$(call QUIET_CLEAN, config)
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$(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null
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clean:
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$(call QUIET_CLEAN, libbpf) $(RM) $(TARGETS) $(CXX_TEST_TARGET) \
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*.o *~ *.a *.so *.so.$(VERSION) .*.d .*.cmd *.pc LIBBPF-CFLAGS
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$(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf
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PHONY += force elfdep bpfdep
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force:
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elfdep:
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@if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit 1 ; fi
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bpfdep:
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@if [ "$(feature-bpf)" != "1" ]; then echo "BPF API too old"; exit 1 ; fi
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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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