[hercules2020/nv-tegra/linux-4.4.git] /

# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
# Most of this file is copied from tools/lib/traceevent/Makefile

LIBBPF_VERSION := $(shell \
        grep -oE '^LIBBPF_([0-9.]+)' libbpf.map | \
        sort -rV | head -n1 | cut -d'_' -f2)
LIBBPF_MAJOR_VERSION := $(firstword $(subst ., ,$(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
# builds
ifndef building_out_of_srctree
srctree := $(patsubst %/,%,$(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 = 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 $(srctree)/tools/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))

OBJ             = $@
N               =

LIB_TARGET      = libbpf.a libbpf.so.$(LIBBPF_VERSION)
LIB_FILE        = libbpf.a libbpf.so*
PC_FILE         = libbpf.pc

# 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
override CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64

# flags specific for shared library
SHLIB_FLAGS := -DSHARED

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

SHARED_OBJDIR   := $(OUTPUT)sharedobjs/
STATIC_OBJDIR   := $(OUTPUT)staticobjs/
BPF_IN_SHARED   := $(SHARED_OBJDIR)libbpf-in.o
BPF_IN_STATIC   := $(STATIC_OBJDIR)libbpf-in.o
VERSION_SCRIPT  := libbpf.map

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 readelf -s --wide $(BPF_IN_SHARED) | \
                           cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' | \
                           awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$8}' | \
                           sort -u | wc -l)
VERSIONED_SYM_COUNT = $(shell readelf -s --wide $(OUTPUT)libbpf.so | \
                              grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l)

CMD_TARGETS = $(LIB_TARGET) $(PC_FILE) $(OUTPUT)test_libbpf

all: fixdep
        $(Q)$(MAKE) all_cmd

all_cmd: $(CMD_TARGETS) check

$(BPF_IN_SHARED): force elfdep bpfdep bpf_helper_defs.h
        @(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
        @(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
        $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(SHARED_OBJDIR) CFLAGS="$(CFLAGS) $(SHLIB_FLAGS)"

$(BPF_IN_STATIC): force elfdep bpfdep bpf_helper_defs.h
        $(Q)$(MAKE) $(build)=libbpf OUTPUT=$(STATIC_OBJDIR)

bpf_helper_defs.h: $(srctree)/include/uapi/linux/bpf.h
        $(Q)$(srctree)/scripts/bpf_helpers_doc.py --header              \
                --file $(srctree)/include/uapi/linux/bpf.h > bpf_helper_defs.h

$(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)

$(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN_SHARED)
        $(QUIET_LINK)$(CC) $(LDFLAGS) \
                --shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \
                -Wl,--version-script=$(VERSION_SCRIPT) $^ -lelf -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) $@; $(AR) rcs $@ $^

$(OUTPUT)test_libbpf: test_libbpf.c $(OUTPUT)libbpf.a
        $(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) $(INCLUDES) $^ -lelf -o $@

$(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_abi: $(OUTPUT)libbpf.so
        @if [ "$(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;              \
                readelf -s --wide $(BPF_IN_SHARED) |                     \
                    cut -d "@" -f1 | sed 's/_v[0-9]_[0-9]_[0-9].*//' |   \
                    awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$8}'|   \
                    sort -u > $(OUTPUT)libbpf_global_syms.tmp;           \
                readelf -s --wide $(OUTPUT)libbpf.so |                   \
                    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

define do_install_mkdir
        if [ ! -d '$(DESTDIR_SQ)$1' ]; then             \
                $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \
        fi
endef

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_TARGET)) \
                $(call do_install_mkdir,$(libdir_SQ)); \
                cp -fpR $(LIB_FILE) $(DESTDIR)$(libdir_SQ)

install_headers: bpf_helper_defs.h
        $(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); \
                $(call do_install,libbpf_util.h,$(prefix)/include/bpf,644); \
                $(call do_install,xsk.h,$(prefix)/include/bpf,644); \
                $(call do_install,bpf_helpers.h,$(prefix)/include/bpf,644); \
                $(call do_install,bpf_helper_defs.h,$(prefix)/include/bpf,644); \
                $(call do_install,bpf_tracing.h,$(prefix)/include/bpf,644); \
                $(call do_install,bpf_endian.h,$(prefix)/include/bpf,644); \
                $(call do_install,bpf_core_read.h,$(prefix)/include/bpf,644);

install_pkgconfig: $(PC_FILE)
        $(call QUIET_INSTALL, $(PC_FILE)) \
                $(call do_install,$(PC_FILE),$(libdir_SQ)/pkgconfig,644)

install: install_lib install_pkgconfig

### Cleaning rules

config-clean:
        $(call QUIET_CLEAN, config)
        $(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null

clean:
        $(call QUIET_CLEAN, libbpf) $(RM) -rf $(CMD_TARGETS) \
                *.o *~ *.a *.so *.so.$(LIBBPF_MAJOR_VERSION) .*.d .*.cmd \
                *.pc LIBBPF-CFLAGS bpf_helper_defs.h \
                $(SHARED_OBJDIR) $(STATIC_OBJDIR)
        $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf



PHONY += force elfdep bpfdep cscope tags
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

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: