Makefile - platform/external/libtracefs - Git at Google

 # SPDX-License-Identifier: LGPL-2.1
 # libtracefs version
 TFS_VERSION = 0
 TFS_PATCHLEVEL = 1
 TFS_EXTRAVERSION = 0
 TRACEFS_VERSION = $(TFS_VERSION).$(TFS_PATCHLEVEL).$(TFS_EXTRAVERSION)

 export TFS_VERSION
 export TFS_PATCHLEVEL
 export TFS_EXTRAVERSION
 export TRACEFS_VERSION

 # taken from trace-cmd
 MAKEFLAGS += --no-print-directory

 # 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)
 $(call allow-override,PKG_CONFIG,pkg-config)

 EXT = -std=gnu99
 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))'

 LP64 := $(shell echo __LP64__ | ${CC} ${CFLAGS} -E -x c - | tail -n 1)
 ifeq ($(LP64), 1)
   libdir_relative_temp = lib64
 else
   libdir_relative_temp = lib
 endif

 libdir_relative ?= $(libdir_relative_temp)
 prefix ?= /usr/local
 bindir_relative = bin
 bindir = $(prefix)/$(bindir_relative)
 man_dir = $(prefix)/share/man
 man_dir_SQ = '$(subst ','\'',$(man_dir))'
 libdir = $(prefix)/$(libdir_relative)
 libdir_SQ = '$(subst ','\'',$(libdir))'
 includedir = $(prefix)/include/tracefs
 includedir_SQ = '$(subst ','\'',$(includedir))'
 pkgconfig_dir ?= $(word 1,$(shell $(PKG_CONFIG) 		\
 			--variable pc_path pkg-config | tr ":" " "))

 PKG_CONFIG_SOURCE_FILE = libtracefs.pc
 PKG_CONFIG_FILE := $(addprefix $(OUTPUT),$(PKG_CONFIG_SOURCE_FILE))

 LIBTRACEEVENT_INCLUDES = $(shell $(PKG_CONFIG) --cflags libtraceevent)
 LIBTRACEEVENT_LIBS = $(shell $(PKG_CONFIG) --libs libtraceevent)

 ifeq ("$(LIBTRACEEVENT_INCLUDES)","")
 $(error libtraceevent.so not installed)
 endif

 ifeq ($(prefix),/usr/local)
 etcdir ?= /etc
 else
 etcdir ?= $(prefix)/etc
 endif
 etcdir_SQ = '$(subst ','\'',$(etcdir))'

 export man_dir man_dir_SQ html_install html_install_SQ INSTALL
 export img_install img_install_SQ
 export DESTDIR DESTDIR_SQ

 # Shell quotes
 bindir_SQ = $(subst ','\'',$(bindir))
 bindir_relative_SQ = $(subst ','\'',$(bindir_relative))

 pound := \#

 HELP_DIR = -DHELP_DIR=$(html_install)
 HELP_DIR_SQ = '$(subst ','\'',$(HELP_DIR))'
 #' emacs highlighting gets confused by the above escaped quote.

 BASH_COMPLETE_DIR ?= $(etcdir)/bash_completion.d
 LD_SO_CONF_DIR ?= $(etcdir)/ld.so.conf.d
 TRACE_LD_FILE ?= trace.conf

 # copy a bit from Linux kbuild

 ifeq ("$(origin V)", "command line")
   VERBOSE = $(V)
 endif
 ifndef VERBOSE
   VERBOSE = 0
 endif

 SILENT := $(if $(findstring s,$(filter-out --%,$(MAKEFLAGS))),1)

 # $(call test-build, snippet, ret) -> ret if snippet compiles
 #                                  -> empty otherwise
 test-build = $(if $(shell sh -c 'echo "$(1)" | \
 	$(CC) -o /dev/null -c -x c - > /dev/null 2>&1 && echo y'), $2)

 # have flush/fua block layer instead of barriers?
 blk-flags := $(call test-build,$(BLK_TC_FLUSH_SOURCE),-DHAVE_BLK_TC_FLUSH)

 ifeq ("$(origin O)", "command line")

   saved-output := $(O)
   BUILD_OUTPUT := $(shell cd $(O) && /bin/pwd)
   $(if $(BUILD_OUTPUT),, \
     $(error output directory "$(saved-output)" does not exist))

 else
   BUILD_OUTPUT = $(CURDIR)
 endif

 srctree		:= $(if $(BUILD_SRC),$(BUILD_SRC),$(CURDIR))
 objtree		:= $(BUILD_OUTPUT)
 src		:= $(srctree)
 obj		:= $(objtree)
 bdir		:= $(obj)/lib/tracefs

 export prefix bindir src obj bdir

 LIBTRACEFS_STATIC = $(bdir)/libtracefs.a
 LIBTRACEFS_SHARED = $(bdir)/libtracefs.so.$(TRACEFS_VERSION)

 TRACE_LIBS = $(LIBTRACEEVENT_LIBS)

 export LIBS TRACE_LIBS
 export LIBTRACEFS_STATIC LIBTRACEFS_SHARED

 export Q SILENT VERBOSE EXT

 # Include the utils
 include scripts/utils.mk

 INCLUDES = -I$(src)/include
 INCLUDES += -I$(src)/include/tracefs

 include $(src)/scripts/features.mk

 # Set compile option CFLAGS if not set elsewhere
 CFLAGS ?= -g -Wall
 CPPFLAGS ?=
 LDFLAGS ?=

 CUNIT_INSTALLED := $(shell if (printf "$(pound)include <CUnit/Basic.h>\n void main(){CU_initialize_registry();}" | $(CC) -x c - -lcunit -o /dev/null >/dev/null 2>&1) ; then echo 1; else echo 0 ; fi)
 export CUNIT_INSTALLED

 export CFLAGS
 export INCLUDES

 # Required CFLAGS
 override CFLAGS += -D_GNU_SOURCE $(LIBTRACEEVENT_INCLUDES)

 # Append required CFLAGS
 override CFLAGS += $(INCLUDES)

 all: all_cmd

 LIB_TARGET  = libtracefs.a libtracefs.so.$(TRACEFS_VERSION)
 LIB_INSTALL = libtracefs.a libtracefs.so*
 LIB_INSTALL := $(addprefix $(bdir)/,$(LIB_INSTALL))

 TARGETS = $(LIBTRACEFS_SHARED) $(LIBTRACEFS_STATIC)

 all_cmd: $(TARGETS) $(PKG_CONFIG_FILE)

 libtracefs.a: $(LIBTRACEFS_STATIC)
 libtracefs.so: $(LIBTRACEFS_SHARED)

 libs:

 test: force $(LIBTRACEFS_STATIC)
 ifneq ($(CUNIT_INSTALLED),1)
 	$(error CUnit framework not installed, cannot build unit tests))
 endif
 	$(Q)$(MAKE) -C $(src)/utest $@

 define find_tag_files
 	find . -name '\.pc' -prune -o -name '*\.[ch]' -print -o -name '*\.[ch]pp' \
 		! -name '\.#' -print
 endef

 define do_make_pkgconfig_file
 	cp -f ${PKG_CONFIG_SOURCE_FILE}.template ${PKG_CONFIG_FILE};	\
 	sed -i "s|INSTALL_PREFIX|${1}|g" ${PKG_CONFIG_FILE}; 		\
 	sed -i "s|LIB_VERSION|${TRACEFS_VERSION}|g" ${PKG_CONFIG_FILE}; \
 	sed -i "s|LIB_DIR|${libdir}|g" ${PKG_CONFIG_FILE}; \
 	sed -i "s|HEADER_DIR|$(includedir)|g" ${PKG_CONFIG_FILE};
 endef

 $(PKG_CONFIG_FILE) : ${PKG_CONFIG_SOURCE_FILE}.template
 	$(Q) $(call do_make_pkgconfig_file,$(prefix))

 define do_install_pkgconfig_file
 	if [ -n "${pkgconfig_dir}" ]; then 					\
 		$(call do_install,$(PKG_CONFIG_FILE),$(pkgconfig_dir),644); 	\
 	else 									\
 		(echo Failed to locate pkg-config directory) 1>&2;		\
 	fi
 endef

 tags:	force
 	$(RM) tags
 	$(call find_tag_files) | xargs ctags --extra=+f --c-kinds=+px

 TAGS:	force
 	$(RM) TAGS
 	$(call find_tag_files) | xargs etags

 cscope: force
 	$(RM) cscope*
 	$(call find_tag_files) | cscope -b -q

 install_libs: libs install_pkgconfig
 	$(Q)$(call do_install,$(LIBTRACEFS_SHARED),$(libdir_SQ)); \
 		cp -fpR $(LIB_INSTALL) $(DESTDIR)$(libdir_SQ)
 	$(Q)$(call do_install,$(src)/include/tracefs.h,$(includedir_SQ))
 	$(Q)$(call do_install_ld,$(TRACE_LD_FILE),$(LD_SO_CONF_DIR),$(libdir_SQ))

 install: install_libs

 install_pkgconfig: $(PKG_CONFIG_FILE)
 	$(Q)$(call , $(PKG_CONFIG_FILE)) \
 		$(call do_install_pkgconfig_file,$(prefix))

 doc:
 	$(MAKE) -C $(src)/Documentation all
 doc_gui:
 	$(MAKE) -C $(kshark-dir)/Documentation all


 doc_clean:
 	$(MAKE) -C $(src)/Documentation clean
 doc_gui_clean:
 	$(MAKE) -C $(kshark-dir)/Documentation clean

 install_doc:
 	$(MAKE) -C $(src)/Documentation install
 install_doc_gui:
 	$(MAKE) -C $(kshark-dir)/Documentation install

 PHONY += force
 force:

 # 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)

 DEFAULT_TARGET = $(LIBTRACEFS_STATIC)

 OBJS =
 OBJS += tracefs-utils.o
 OBJS += tracefs-instance.o
 OBJS += tracefs-events.o

 OBJS := $(OBJS:%.o=$(bdir)/%.o)
 DEPS := $(OBJS:$(bdir)/%.o=$(bdir)/.%.d)

 all: $(DEFAULT_TARGET)

 $(bdir):
 	@mkdir -p $(bdir)

 LIBS = -L$(obj)/lib/traceevent -ltraceevent

 $(LIBTRACEFS_STATIC): force
 	$(Q)mkdir -p $(bdir)
 	$(Q)$(MAKE) -C $(src)/src $@

 $(bdir)/libtracefs.so.$(TRACEFS_VERSION): force
 	$(Q)mkdir -p $(bdir)
 	$(Q)$(MAKE) -C $(src)/src $@

 clean:
 	$(MAKE) -C $(src)/utest clean
 	$(MAKE) -C $(src)/src clean
 	$(RM) $(TARGETS) $(bdir)/*.a $(bdir)/*.so $(bdir)/*.so.* $(bdir)/*.o $(bdir)/.*.d
 	$(RM) $(PKG_CONFIG_FILE)

 .PHONY: clean
	# SPDX-License-Identifier: LGPL-2.1
	# libtracefs version
	TFS_VERSION = 0
	TFS_PATCHLEVEL = 1
	TFS_EXTRAVERSION = 0
	TRACEFS_VERSION = $(TFS_VERSION).$(TFS_PATCHLEVEL).$(TFS_EXTRAVERSION)

	export TFS_VERSION
	export TFS_PATCHLEVEL
	export TFS_EXTRAVERSION
	export TRACEFS_VERSION

	# taken from trace-cmd
	MAKEFLAGS += --no-print-directory

	# 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)
	$(call allow-override,PKG_CONFIG,pkg-config)

	EXT = -std=gnu99
	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))'

	LP64 := $(shell echo __LP64__ \| ${CC} ${CFLAGS} -E -x c - \| tail -n 1)
	ifeq ($(LP64), 1)
	libdir_relative_temp = lib64
	else
	libdir_relative_temp = lib
	endif

	libdir_relative ?= $(libdir_relative_temp)
	prefix ?= /usr/local
	bindir_relative = bin
	bindir = $(prefix)/$(bindir_relative)
	man_dir = $(prefix)/share/man
	man_dir_SQ = '$(subst ','\'',$(man_dir))'
	libdir = $(prefix)/$(libdir_relative)
	libdir_SQ = '$(subst ','\'',$(libdir))'
	includedir = $(prefix)/include/tracefs
	includedir_SQ = '$(subst ','\'',$(includedir))'
	pkgconfig_dir ?= $(word 1,$(shell $(PKG_CONFIG) \
	--variable pc_path pkg-config \| tr ":" " "))

	PKG_CONFIG_SOURCE_FILE = libtracefs.pc
	PKG_CONFIG_FILE := $(addprefix $(OUTPUT),$(PKG_CONFIG_SOURCE_FILE))

	LIBTRACEEVENT_INCLUDES = $(shell $(PKG_CONFIG) --cflags libtraceevent)
	LIBTRACEEVENT_LIBS = $(shell $(PKG_CONFIG) --libs libtraceevent)

	ifeq ("$(LIBTRACEEVENT_INCLUDES)","")
	$(error libtraceevent.so not installed)
	endif

	ifeq ($(prefix),/usr/local)
	etcdir ?= /etc
	else
	etcdir ?= $(prefix)/etc
	endif
	etcdir_SQ = '$(subst ','\'',$(etcdir))'

	export man_dir man_dir_SQ html_install html_install_SQ INSTALL
	export img_install img_install_SQ
	export DESTDIR DESTDIR_SQ

	# Shell quotes
	bindir_SQ = $(subst ','\'',$(bindir))
	bindir_relative_SQ = $(subst ','\'',$(bindir_relative))

	pound := \#

	HELP_DIR = -DHELP_DIR=$(html_install)
	HELP_DIR_SQ = '$(subst ','\'',$(HELP_DIR))'
	#' emacs highlighting gets confused by the above escaped quote.

	BASH_COMPLETE_DIR ?= $(etcdir)/bash_completion.d
	LD_SO_CONF_DIR ?= $(etcdir)/ld.so.conf.d
	TRACE_LD_FILE ?= trace.conf

	# copy a bit from Linux kbuild

	ifeq ("$(origin V)", "command line")
	VERBOSE = $(V)
	endif
	ifndef VERBOSE
	VERBOSE = 0
	endif

	SILENT := $(if $(findstring s,$(filter-out --%,$(MAKEFLAGS))),1)

	# $(call test-build, snippet, ret) -> ret if snippet compiles
	# -> empty otherwise
	test-build = $(if $(shell sh -c 'echo "$(1)" \| \
	$(CC) -o /dev/null -c -x c - > /dev/null 2>&1 && echo y'), $2)

	# have flush/fua block layer instead of barriers?
	blk-flags := $(call test-build,$(BLK_TC_FLUSH_SOURCE),-DHAVE_BLK_TC_FLUSH)

	ifeq ("$(origin O)", "command line")

	saved-output := $(O)
	BUILD_OUTPUT := $(shell cd $(O) && /bin/pwd)
	$(if $(BUILD_OUTPUT),, \
	$(error output directory "$(saved-output)" does not exist))

	else
	BUILD_OUTPUT = $(CURDIR)
	endif

	srctree := $(if $(BUILD_SRC),$(BUILD_SRC),$(CURDIR))
	objtree := $(BUILD_OUTPUT)
	src := $(srctree)
	obj := $(objtree)
	bdir := $(obj)/lib/tracefs

	export prefix bindir src obj bdir

	LIBTRACEFS_STATIC = $(bdir)/libtracefs.a
	LIBTRACEFS_SHARED = $(bdir)/libtracefs.so.$(TRACEFS_VERSION)

	TRACE_LIBS = $(LIBTRACEEVENT_LIBS)

	export LIBS TRACE_LIBS
	export LIBTRACEFS_STATIC LIBTRACEFS_SHARED

	export Q SILENT VERBOSE EXT

	# Include the utils
	include scripts/utils.mk

	INCLUDES = -I$(src)/include
	INCLUDES += -I$(src)/include/tracefs

	include $(src)/scripts/features.mk

	# Set compile option CFLAGS if not set elsewhere
	CFLAGS ?= -g -Wall
	CPPFLAGS ?=
	LDFLAGS ?=

	CUNIT_INSTALLED := $(shell if (printf "$(pound)include <CUnit/Basic.h>\n void main(){CU_initialize_registry();}" \| $(CC) -x c - -lcunit -o /dev/null >/dev/null 2>&1) ; then echo 1; else echo 0 ; fi)
	export CUNIT_INSTALLED

	export CFLAGS
	export INCLUDES

	# Required CFLAGS
	override CFLAGS += -D_GNU_SOURCE $(LIBTRACEEVENT_INCLUDES)

	# Append required CFLAGS
	override CFLAGS += $(INCLUDES)

	all: all_cmd

	LIB_TARGET = libtracefs.a libtracefs.so.$(TRACEFS_VERSION)
	LIB_INSTALL = libtracefs.a libtracefs.so*
	LIB_INSTALL := $(addprefix $(bdir)/,$(LIB_INSTALL))

	TARGETS = $(LIBTRACEFS_SHARED) $(LIBTRACEFS_STATIC)

	all_cmd: $(TARGETS) $(PKG_CONFIG_FILE)

	libtracefs.a: $(LIBTRACEFS_STATIC)
	libtracefs.so: $(LIBTRACEFS_SHARED)

	libs:

	test: force $(LIBTRACEFS_STATIC)
	ifneq ($(CUNIT_INSTALLED),1)
	$(error CUnit framework not installed, cannot build unit tests))
	endif
	$(Q)$(MAKE) -C $(src)/utest $@

	define find_tag_files
	find . -name '\.pc' -prune -o -name '\.[ch]' -print -o -name '\.[ch]pp' \
	! -name '\.#' -print
	endef

	define do_make_pkgconfig_file
	cp -f ${PKG_CONFIG_SOURCE_FILE}.template ${PKG_CONFIG_FILE}; \
	sed -i "s\|INSTALL_PREFIX\|${1}\|g" ${PKG_CONFIG_FILE}; \
	sed -i "s\|LIB_VERSION\|${TRACEFS_VERSION}\|g" ${PKG_CONFIG_FILE}; \
	sed -i "s\|LIB_DIR\|${libdir}\|g" ${PKG_CONFIG_FILE}; \
	sed -i "s\|HEADER_DIR\|$(includedir)\|g" ${PKG_CONFIG_FILE};
	endef

	$(PKG_CONFIG_FILE) : ${PKG_CONFIG_SOURCE_FILE}.template
	$(Q) $(call do_make_pkgconfig_file,$(prefix))

	define do_install_pkgconfig_file
	if [ -n "${pkgconfig_dir}" ]; then \
	$(call do_install,$(PKG_CONFIG_FILE),$(pkgconfig_dir),644); \
	else \
	(echo Failed to locate pkg-config directory) 1>&2; \
	fi
	endef

	tags: force
	$(RM) tags
	$(call find_tag_files) \| xargs ctags --extra=+f --c-kinds=+px

	TAGS: force
	$(RM) TAGS
	$(call find_tag_files) \| xargs etags

	cscope: force
	$(RM) cscope*
	$(call find_tag_files) \| cscope -b -q

	install_libs: libs install_pkgconfig
	$(Q)$(call do_install,$(LIBTRACEFS_SHARED),$(libdir_SQ)); \
	cp -fpR $(LIB_INSTALL) $(DESTDIR)$(libdir_SQ)
	$(Q)$(call do_install,$(src)/include/tracefs.h,$(includedir_SQ))
	$(Q)$(call do_install_ld,$(TRACE_LD_FILE),$(LD_SO_CONF_DIR),$(libdir_SQ))

	install: install_libs

	install_pkgconfig: $(PKG_CONFIG_FILE)
	$(Q)$(call , $(PKG_CONFIG_FILE)) \
	$(call do_install_pkgconfig_file,$(prefix))

	doc:
	$(MAKE) -C $(src)/Documentation all
	doc_gui:
	$(MAKE) -C $(kshark-dir)/Documentation all


	doc_clean:
	$(MAKE) -C $(src)/Documentation clean
	doc_gui_clean:
	$(MAKE) -C $(kshark-dir)/Documentation clean

	install_doc:
	$(MAKE) -C $(src)/Documentation install
	install_doc_gui:
	$(MAKE) -C $(kshark-dir)/Documentation install

	PHONY += force
	force:

	# 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)

	DEFAULT_TARGET = $(LIBTRACEFS_STATIC)

	OBJS =
	OBJS += tracefs-utils.o
	OBJS += tracefs-instance.o
	OBJS += tracefs-events.o

	OBJS := $(OBJS:%.o=$(bdir)/%.o)
	DEPS := $(OBJS:$(bdir)/%.o=$(bdir)/.%.d)

	all: $(DEFAULT_TARGET)

	$(bdir):
	@mkdir -p $(bdir)

	LIBS = -L$(obj)/lib/traceevent -ltraceevent

	$(LIBTRACEFS_STATIC): force
	$(Q)mkdir -p $(bdir)
	$(Q)$(MAKE) -C $(src)/src $@

	$(bdir)/libtracefs.so.$(TRACEFS_VERSION): force
	$(Q)mkdir -p $(bdir)
	$(Q)$(MAKE) -C $(src)/src $@

	clean:
	$(MAKE) -C $(src)/utest clean
	$(MAKE) -C $(src)/src clean
	$(RM) $(TARGETS) $(bdir)/.a $(bdir)/.so $(bdir)/.so. $(bdir)/.o $(bdir)/..d
	$(RM) $(PKG_CONFIG_FILE)

	.PHONY: clean