mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-17 04:49:33 +07:00
ab9e084821
Make global symbols in libbpf DSO hidden by default with
-fvisibility=hidden and export symbols that are part of ABI explicitly
with __attribute__((visibility("default"))).
This is common practice that should prevent from accidentally exporting
a symbol, that is not supposed to be a part of ABI what, in turn,
improves both libbpf developer- and user-experiences. See [1] for more
details.
Export control becomes more important since more and more projects use
libbpf.
The patch doesn't export a bunch of netlink related functions since as
agreed in [2] they'll be reworked. That doesn't break bpftool since
bpftool links libbpf statically.
[1] https://www.akkadia.org/drepper/dsohowto.pdf (2.2 Export Control)
[2] https://www.mail-archive.com/netdev@vger.kernel.org/msg251434.html
Signed-off-by: Andrey Ignatov <rdna@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
222 lines
6.3 KiB
Makefile
222 lines
6.3 KiB
Makefile
# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
|
|
# Most of this file is copied from tools/lib/traceevent/Makefile
|
|
|
|
BPF_VERSION = 0
|
|
BPF_PATCHLEVEL = 0
|
|
BPF_EXTRAVERSION = 1
|
|
|
|
MAKEFLAGS += --no-print-directory
|
|
|
|
ifeq ($(srctree),)
|
|
srctree := $(patsubst %/,%,$(dir $(CURDIR)))
|
|
srctree := $(patsubst %/,%,$(dir $(srctree)))
|
|
srctree := $(patsubst %/,%,$(dir $(srctree)))
|
|
#$(info Determined 'srctree' to be $(srctree))
|
|
endif
|
|
|
|
# Makefiles suck: This macro sets a default value of $(2) for the
|
|
# variable named by $(1), unless the variable has been set by
|
|
# environment or command line. This is necessary for CC and AR
|
|
# because make sets default values, so the simpler ?= approach
|
|
# won't work as expected.
|
|
define allow-override
|
|
$(if $(or $(findstring environment,$(origin $(1))),\
|
|
$(findstring command line,$(origin $(1)))),,\
|
|
$(eval $(1) = $(2)))
|
|
endef
|
|
|
|
# Allow setting CC and AR, or setting CROSS_COMPILE as a prefix.
|
|
$(call allow-override,CC,$(CROSS_COMPILE)gcc)
|
|
$(call allow-override,AR,$(CROSS_COMPILE)ar)
|
|
|
|
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 = lib64
|
|
else
|
|
libdir_relative = lib
|
|
endif
|
|
|
|
prefix ?= /usr/local
|
|
libdir = $(prefix)/$(libdir_relative)
|
|
man_dir = $(prefix)/share/man
|
|
man_dir_SQ = '$(subst ','\'',$(man_dir))'
|
|
|
|
export man_dir man_dir_SQ INSTALL
|
|
export DESTDIR DESTDIR_SQ
|
|
|
|
include ../../scripts/Makefile.include
|
|
|
|
# copy a bit from Linux kbuild
|
|
|
|
ifeq ("$(origin V)", "command line")
|
|
VERBOSE = $(V)
|
|
endif
|
|
ifndef VERBOSE
|
|
VERBOSE = 0
|
|
endif
|
|
|
|
FEATURE_USER = .libbpf
|
|
FEATURE_TESTS = libelf libelf-mmap bpf reallocarray
|
|
FEATURE_DISPLAY = libelf bpf
|
|
|
|
INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/tools/arch/$(ARCH)/include/uapi -I$(srctree)/tools/include/uapi
|
|
FEATURE_CHECK_CFLAGS-bpf = $(INCLUDES)
|
|
|
|
check_feat := 1
|
|
NON_CHECK_FEAT_TARGETS := clean TAGS tags cscope help
|
|
ifdef MAKECMDGOALS
|
|
ifeq ($(filter-out $(NON_CHECK_FEAT_TARGETS),$(MAKECMDGOALS)),)
|
|
check_feat := 0
|
|
endif
|
|
endif
|
|
|
|
ifeq ($(check_feat),1)
|
|
ifeq ($(FEATURES_DUMP),)
|
|
include $(srctree)/tools/build/Makefile.feature
|
|
else
|
|
include $(FEATURES_DUMP)
|
|
endif
|
|
endif
|
|
|
|
export prefix libdir src obj
|
|
|
|
# Shell quotes
|
|
libdir_SQ = $(subst ','\'',$(libdir))
|
|
libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
|
|
|
|
LIB_FILE = libbpf.a libbpf.so
|
|
|
|
VERSION = $(BPF_VERSION)
|
|
PATCHLEVEL = $(BPF_PATCHLEVEL)
|
|
EXTRAVERSION = $(BPF_EXTRAVERSION)
|
|
|
|
OBJ = $@
|
|
N =
|
|
|
|
LIBBPF_VERSION = $(BPF_VERSION).$(BPF_PATCHLEVEL).$(BPF_EXTRAVERSION)
|
|
|
|
# Set compile option CFLAGS
|
|
ifdef EXTRA_CFLAGS
|
|
CFLAGS := $(EXTRA_CFLAGS)
|
|
else
|
|
CFLAGS := -g -Wall
|
|
endif
|
|
|
|
ifeq ($(feature-libelf-mmap), 1)
|
|
override CFLAGS += -DHAVE_LIBELF_MMAP_SUPPORT
|
|
endif
|
|
|
|
ifeq ($(feature-reallocarray), 0)
|
|
override CFLAGS += -DCOMPAT_NEED_REALLOCARRAY
|
|
endif
|
|
|
|
# Append required CFLAGS
|
|
override CFLAGS += $(EXTRA_WARNINGS)
|
|
override CFLAGS += -Werror -Wall
|
|
override CFLAGS += -fPIC
|
|
override CFLAGS += $(INCLUDES)
|
|
override CFLAGS += -fvisibility=hidden
|
|
|
|
ifeq ($(VERBOSE),1)
|
|
Q =
|
|
else
|
|
Q = @
|
|
endif
|
|
|
|
# Disable command line variables (CFLAGS) override from top
|
|
# level Makefile (perf), otherwise build Makefile will get
|
|
# the same command line setup.
|
|
MAKEOVERRIDES=
|
|
|
|
all:
|
|
|
|
export srctree OUTPUT CC LD CFLAGS V
|
|
include $(srctree)/tools/build/Makefile.include
|
|
|
|
BPF_IN := $(OUTPUT)libbpf-in.o
|
|
LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))
|
|
|
|
CMD_TARGETS = $(LIB_FILE)
|
|
|
|
TARGETS = $(CMD_TARGETS)
|
|
|
|
all: fixdep all_cmd
|
|
|
|
all_cmd: $(CMD_TARGETS)
|
|
|
|
$(BPF_IN): force elfdep bpfdep
|
|
@(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/netlink.h -a -f ../../../include/uapi/linux/netlink.h && ( \
|
|
(diff -B ../../include/uapi/linux/netlink.h ../../../include/uapi/linux/netlink.h >/dev/null) || \
|
|
echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/netlink.h' differs from latest version at 'include/uapi/linux/netlink.h'" >&2 )) || true
|
|
@(test -f ../../include/uapi/linux/if_link.h -a -f ../../../include/uapi/linux/if_link.h && ( \
|
|
(diff -B ../../include/uapi/linux/if_link.h ../../../include/uapi/linux/if_link.h >/dev/null) || \
|
|
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
|
|
$(Q)$(MAKE) $(build)=libbpf
|
|
|
|
$(OUTPUT)libbpf.so: $(BPF_IN)
|
|
$(QUIET_LINK)$(CC) --shared $^ -o $@
|
|
|
|
$(OUTPUT)libbpf.a: $(BPF_IN)
|
|
$(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^
|
|
|
|
define do_install
|
|
if [ ! -d '$(DESTDIR_SQ)$2' ]; then \
|
|
$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
|
|
fi; \
|
|
$(INSTALL) $1 $(if $3,-m $3,) '$(DESTDIR_SQ)$2'
|
|
endef
|
|
|
|
install_lib: all_cmd
|
|
$(call QUIET_INSTALL, $(LIB_FILE)) \
|
|
$(call do_install,$(LIB_FILE),$(libdir_SQ))
|
|
|
|
install_headers:
|
|
$(call QUIET_INSTALL, headers) \
|
|
$(call do_install,bpf.h,$(prefix)/include/bpf,644); \
|
|
$(call do_install,libbpf.h,$(prefix)/include/bpf,644);
|
|
$(call do_install,btf.h,$(prefix)/include/bpf,644);
|
|
|
|
install: install_lib
|
|
|
|
### Cleaning rules
|
|
|
|
config-clean:
|
|
$(call QUIET_CLEAN, config)
|
|
$(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null
|
|
|
|
clean:
|
|
$(call QUIET_CLEAN, libbpf) $(RM) *.o *~ $(TARGETS) *.a *.so .*.d .*.cmd \
|
|
$(RM) LIBBPF-CFLAGS
|
|
$(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf
|
|
|
|
|
|
|
|
PHONY += force elfdep bpfdep
|
|
force:
|
|
|
|
elfdep:
|
|
@if [ "$(feature-libelf)" != "1" ]; then echo "No libelf found"; exit 1 ; fi
|
|
|
|
bpfdep:
|
|
@if [ "$(feature-bpf)" != "1" ]; then echo "BPF API too old"; exit 1 ; fi
|
|
|
|
# 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)
|