mirror of
https://github.com/torvalds/linux.git
synced 2024-11-29 23:51:37 +00:00
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)
|
|
# Most of this file is copied from tools/lib/traceevent/Makefile
|
|
|
|
RM ?= rm
|
|
srctree := $(realpath $(srctree))
|
|
|
|
VERSION_SCRIPT := libbpf.map
|
|
LIBBPF_VERSION := $(shell \
|
|
grep -oE '^LIBBPF_([0-9.]+)' $(VERSION_SCRIPT) | \
|
|
sort -rV | head -n1 | cut -d'_' -f2)
|
|
LIBBPF_MAJOR_VERSION := $(word 1,$(subst ., ,$(LIBBPF_VERSION)))
|
|
LIBBPF_MINOR_VERSION := $(word 2,$(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 = $(V)
|
|
endif
|
|
ifndef VERBOSE
|
|
VERBOSE = 0
|
|
endif
|
|
|
|
INCLUDES = -I$(or $(OUTPUT),.) \
|
|
-I$(srctree)/tools/include -I$(srctree)/tools/include/uapi
|
|
|
|
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 -O2
|
|
endif
|
|
|
|
# Append required CFLAGS
|
|
override CFLAGS += -std=gnu89
|
|
override CFLAGS += $(EXTRA_WARNINGS) -Wno-switch-enum
|
|
override CFLAGS += -Werror -Wall
|
|
override CFLAGS += $(INCLUDES)
|
|
override CFLAGS += -fvisibility=hidden
|
|
override CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
|
|
override CFLAGS += $(CLANG_CROSS_FLAGS)
|
|
|
|
# flags specific for shared library
|
|
SHLIB_FLAGS := -DSHARED -fPIC
|
|
|
|
ifeq ($(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
|
|
BPF_HELPER_DEFS := $(OUTPUT)bpf_helper_defs.h
|
|
BPF_GENERATED := $(BPF_HELPER_DEFS)
|
|
|
|
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].*//' | \
|
|
sed 's/\[.*\]//' | \
|
|
awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}' | \
|
|
sort -u | wc -l)
|
|
VERSIONED_SYM_COUNT = $(shell readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \
|
|
sed 's/\[.*\]//' | \
|
|
awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}' | \
|
|
grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l)
|
|
|
|
CMD_TARGETS = $(LIB_TARGET) $(PC_FILE)
|
|
|
|
all: fixdep
|
|
$(Q)$(MAKE) all_cmd
|
|
|
|
all_cmd: $(CMD_TARGETS) check
|
|
|
|
$(BPF_IN_SHARED): force $(BPF_GENERATED)
|
|
@(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/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 $(BPF_GENERATED)
|
|
$(Q)$(MAKE) $(build)=libbpf OUTPUT=$(STATIC_OBJDIR)
|
|
|
|
$(BPF_HELPER_DEFS): $(srctree)/tools/include/uapi/linux/bpf.h
|
|
$(QUIET_GEN)$(srctree)/scripts/bpf_doc.py --header \
|
|
--file $(srctree)/tools/include/uapi/linux/bpf.h > $(BPF_HELPER_DEFS)
|
|
|
|
$(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)
|
|
|
|
$(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN_SHARED) $(VERSION_SCRIPT)
|
|
$(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) \
|
|
--shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \
|
|
-Wl,--version-script=$(VERSION_SCRIPT) $< -lelf -lz -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) -f $@; $(AR) rcs $@ $^
|
|
|
|
$(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_version
|
|
|
|
check_abi: $(OUTPUT)libbpf.so $(VERSION_SCRIPT)
|
|
@if [ "$(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].*//' | \
|
|
sed 's/\[.*\]//' | \
|
|
awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}'| \
|
|
sort -u > $(OUTPUT)libbpf_global_syms.tmp; \
|
|
readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \
|
|
sed 's/\[.*\]//' | \
|
|
awk '/GLOBAL/ && /DEFAULT/ && !/UND|ABS/ {print $$NF}'| \
|
|
grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | \
|
|
sort -u > $(OUTPUT)libbpf_versioned_syms.tmp; \
|
|
diff -u $(OUTPUT)libbpf_global_syms.tmp \
|
|
$(OUTPUT)libbpf_versioned_syms.tmp; \
|
|
rm $(OUTPUT)libbpf_global_syms.tmp \
|
|
$(OUTPUT)libbpf_versioned_syms.tmp; \
|
|
exit 1; \
|
|
fi
|
|
|
|
HDR_MAJ_VERSION := $(shell grep -oE '^$(pound)define LIBBPF_MAJOR_VERSION ([0-9]+)$$' libbpf_version.h | cut -d' ' -f3)
|
|
HDR_MIN_VERSION := $(shell grep -oE '^$(pound)define LIBBPF_MINOR_VERSION ([0-9]+)$$' libbpf_version.h | cut -d' ' -f3)
|
|
|
|
check_version: $(VERSION_SCRIPT) libbpf_version.h
|
|
@if [ "$(HDR_MAJ_VERSION)" != "$(LIBBPF_MAJOR_VERSION)" ]; then \
|
|
echo "Error: libbpf major version mismatch detected: " \
|
|
"'$(HDR_MAJ_VERSION)' != '$(LIBBPF_MAJOR_VERSION)'" >&2; \
|
|
exit 1; \
|
|
fi
|
|
@if [ "$(HDR_MIN_VERSION)" != "$(LIBBPF_MINOR_VERSION)" ]; then \
|
|
echo "Error: libbpf minor version mismatch detected: " \
|
|
"'$(HDR_MIN_VERSION)' != '$(LIBBPF_MINOR_VERSION)'" >&2; \
|
|
exit 1; \
|
|
fi
|
|
|
|
define do_install_mkdir
|
|
if [ ! -d '$(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) $(if $3,-m $3,) $1 '$(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)
|
|
|
|
SRC_HDRS := bpf.h libbpf.h btf.h libbpf_common.h libbpf_legacy.h \
|
|
bpf_helpers.h bpf_tracing.h bpf_endian.h bpf_core_read.h \
|
|
skel_internal.h libbpf_version.h usdt.bpf.h
|
|
GEN_HDRS := $(BPF_GENERATED)
|
|
|
|
INSTALL_PFX := $(DESTDIR)$(prefix)/include/bpf
|
|
INSTALL_SRC_HDRS := $(addprefix $(INSTALL_PFX)/, $(SRC_HDRS))
|
|
INSTALL_GEN_HDRS := $(addprefix $(INSTALL_PFX)/, $(notdir $(GEN_HDRS)))
|
|
|
|
$(INSTALL_SRC_HDRS): $(INSTALL_PFX)/%.h: %.h
|
|
$(call QUIET_INSTALL, $@) \
|
|
$(call do_install,$<,$(prefix)/include/bpf,644)
|
|
|
|
$(INSTALL_GEN_HDRS): $(INSTALL_PFX)/%.h: $(OUTPUT)%.h
|
|
$(call QUIET_INSTALL, $@) \
|
|
$(call do_install,$<,$(prefix)/include/bpf,644)
|
|
|
|
install_headers: $(BPF_GENERATED) $(INSTALL_SRC_HDRS) $(INSTALL_GEN_HDRS)
|
|
$(call QUIET_INSTALL, libbpf_headers)
|
|
|
|
install_pkgconfig: $(PC_FILE)
|
|
$(call QUIET_INSTALL, $(PC_FILE)) \
|
|
$(call do_install,$(PC_FILE),$(libdir_SQ)/pkgconfig,644)
|
|
|
|
install: install_lib install_pkgconfig install_headers
|
|
|
|
clean:
|
|
$(call QUIET_CLEAN, libbpf) $(RM) -rf $(CMD_TARGETS) \
|
|
*~ .*.d .*.cmd LIBBPF-CFLAGS $(BPF_GENERATED) \
|
|
$(SHARED_OBJDIR) $(STATIC_OBJDIR) \
|
|
$(addprefix $(OUTPUT), \
|
|
*.o *.a *.so *.so.$(LIBBPF_MAJOR_VERSION) *.pc)
|
|
|
|
PHONY += force cscope tags check check_abi check_version
|
|
force:
|
|
|
|
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:
|
|
|
|
help:
|
|
@echo 'libbpf common targets:'
|
|
@echo ' HINT: use "V=1" to enable verbose build'
|
|
@echo ' all - build libraries and pkgconfig'
|
|
@echo ' clean - remove all generated files'
|
|
@echo ' check - check ABI and version info'
|
|
@echo ''
|
|
@echo 'libbpf install targets:'
|
|
@echo ' HINT: use "prefix"(defaults to "/usr/local") or "DESTDIR" (defaults to "/")'
|
|
@echo ' to adjust target destination, e.g. "make prefix=/usr/local install"'
|
|
@echo ' install - build and install all headers, libraries and pkgconfig'
|
|
@echo ' install_headers - install only headers to include/bpf'
|
|
@echo ''
|
|
@echo 'libbpf make targets:'
|
|
@echo ' tags - use ctags to make tag information for source code browsing'
|
|
@echo ' cscope - use cscope to make interactive source code browsing database'
|