| # 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 = $(V) |
| endif |
| ifndef VERBOSE |
| VERBOSE = 0 |
| endif |
| |
| FEATURE_USER = .libbpf |
| FEATURE_TESTS = libelf libelf-mmap bpf reallocarray cxx |
| FEATURE_DISPLAY = libelf bpf |
| |
| INCLUDES = -I. -I$(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)) |
| VERSION_SCRIPT := libbpf.map |
| |
| CMD_TARGETS = $(LIB_FILE) |
| |
| CXX_TEST_TARGET = $(OUTPUT)test_libbpf |
| |
| ifeq ($(feature-cxx), 1) |
| CMD_TARGETS += $(CXX_TEST_TARGET) |
| endif |
| |
| 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 -Wl,--version-script=$(VERSION_SCRIPT) \ |
| $^ -o $@ |
| |
| $(OUTPUT)libbpf.a: $(BPF_IN) |
| $(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^ |
| |
| $(OUTPUT)test_libbpf: test_libbpf.cpp $(OUTPUT)libbpf.a |
| $(QUIET_LINK)$(CXX) $^ -lelf -o $@ |
| |
| define do_install |
| if [ ! -d '$(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) $(TARGETS) $(CXX_TEST_TARGET) \ |
| *.o *~ *.a *.so .*.d .*.cmd 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) |