diff options
Diffstat (limited to 'Makefile')
| -rw-r--r-- | Makefile | 591 |
1 files changed, 591 insertions, 0 deletions
diff --git a/Makefile b/Makefile new file mode 100644 index 00000000..982514ba --- /dev/null +++ b/Makefile @@ -0,0 +1,591 @@ +# SPDX-License-Identifier: GPL-2.0 +# trace-cmd version +TC_VERSION = 3 +TC_PATCHLEVEL = 0 +TC_EXTRAVERSION = 3 +TRACECMD_VERSION = $(TC_VERSION).$(TC_PATCHLEVEL).$(TC_EXTRAVERSION) + +export TC_VERSION +export TC_PATCHLEVEL +export TC_EXTRAVERSION +export TRACECMD_VERSION + +LIBTC_VERSION = 1 +LIBTC_PATCHLEVEL = 1 +LIBTC_EXTRAVERSION = 3 +LIBTRACECMD_VERSION = $(LIBTC_VERSION).$(LIBTC_PATCHLEVEL).$(LIBTC_EXTRAVERSION) + +export LIBTC_VERSION +export LIBTC_PATCHLEVEL +export LIBTC_EXTRAVERSION +export LIBTRACECMD_VERSION + +VERSION_FILE = ltc_version.h + +LIBTRACEEVENT_MIN_VERSION = 1.5 +LIBTRACEFS_MIN_VERSION = 1.3 + +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) +$(call allow-override,LD_SO_CONF_PATH,/etc/ld.so.conf.d/) +$(call allow-override,LDCONFIG,ldconfig) + +export LD_SO_CONF_PATH LDCONFIG + +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 ','\'',$(man_dir))' +html_install_SQ = '$(subst ','\'',$(html_install))' +img_install_SQ = '$(subst ','\'',$(img_install))' +libdir = $(prefix)/$(libdir_relative) +libdir_SQ = '$(subst ','\'',$(libdir))' +includedir = $(prefix)/include +includedir_SQ = '$(subst ','\'',$(includedir))' +pkgconfig_dir ?= $(word 1,$(shell $(PKG_CONFIG) \ + --variable pc_path pkg-config | tr ":" " ")) + +etcdir ?= /etc +etcdir_SQ = '$(subst ','\'',$(etcdir))' + +export man_dir man_dir_SQ html_install html_install_SQ INSTALL +export img_install img_install_SQ libdir libdir_SQ includedir_SQ +export DESTDIR DESTDIR_SQ + +ifeq ($(prefix),$(HOME)) +plugin_tracecmd_dir = $(libdir)/trace-cmd/plugins +python_dir ?= $(libdir)/trace-cmd/python +var_dir = $(HOME)/.trace-cmd/ +else +python_dir ?= $(libdir)/trace-cmd/python +PLUGIN_DIR_TRACECMD = -DPLUGIN_TRACECMD_DIR="$(plugin_tracecmd_dir)" +PYTHON_DIR = -DPYTHON_DIR="$(python_dir)" +PLUGIN_DIR_TRACECMD_SQ = '$(subst ','\'',$(PLUGIN_DIR_TRACECMD))' +PYTHON_DIR_SQ = '$(subst ','\'',$(PYTHON_DIR))' +var_dir = /var +endif + +# Shell quotes +bindir_SQ = $(subst ','\'',$(bindir)) +bindir_relative_SQ = $(subst ','\'',$(bindir_relative)) +plugin_tracecmd_dir_SQ = $(subst ','\'',$(plugin_tracecmd_dir)) +python_dir_SQ = $(subst ','\'',$(python_dir)) + +pound := \# + +VAR_DIR = -DVAR_DIR="$(var_dir)" +VAR_DIR_SQ = '$(subst ','\'',$(VAR_DIR))' +var_dir_SQ = '$(subst ','\'',$(var_dir))' + +HELP_DIR = -DHELP_DIR=$(html_install) +HELP_DIR_SQ = '$(subst ','\'',$(HELP_DIR))' +#' emacs highlighting gets confused by the above escaped quote. + +BASH_COMPLETE_DIR ?= $(etcdir)/bash_completion.d + +export PLUGIN_DIR_TRACECMD +export PYTHON_DIR +export PYTHON_DIR_SQ +export plugin_tracecmd_dir_SQ +export python_dir_SQ +export var_dir + +# copy a bit from Linux kbuild + +ifeq ("$(origin V)", "command line") + VERBOSE = $(V) +endif +ifndef VERBOSE + VERBOSE = 0 +endif + +SILENT := $(if $(findstring s,$(filter-out --%,$(MAKEFLAGS))),1) + +SWIG_DEFINED := $(shell if command -v swig; then echo 1; else echo 0; fi) +ifeq ($(SWIG_DEFINED), 0) +BUILD_PYTHON := report_noswig +NO_PYTHON = 1 +endif + +ifndef NO_PYTHON +PYTHON := ctracecmd.so + +PYTHON_VERS ?= python +PYTHON_PKGCONFIG_VERS ?= $(PYTHON_VERS) + +# Can build python? +ifeq ($(shell sh -c "$(PKG_CONFIG) --cflags $(PYTHON_PKGCONFIG_VERS) > /dev/null 2>&1 && echo y"), y) + BUILD_PYTHON := $(PYTHON) + BUILD_PYTHON_WORKS := 1 +else + BUILD_PYTHON := report_nopythondev + NO_PYTHON = 1 +endif +endif # NO_PYTHON + +export BUILD_PYTHON_WORKS +export NO_PYTHON + +# $(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) + +UDIS86_AVAILABLE := $(call test-build,\#include <udis86.h>, y) +ifneq ($(strip $(UDIS86_AVAILABLE)), y) +NO_UDIS86 := 1 +endif + +ifndef NO_UDIS86 +# have udis86 disassembler library? +udis86-flags := -DHAVE_UDIS86 -ludis86 +udis86-ldflags := -ludis86 +endif # NO_UDIS86 + +define BLK_TC_FLUSH_SOURCE +#include <linux/blktrace_api.h> +int main(void) { return BLK_TC_FLUSH; } +endef + +# 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) + +PKG_CONFIG_SOURCE_FILE = libtracecmd.pc +PKG_CONFIG_FILE := $(addprefix $(BUILD_OUTPUT)/,$(PKG_CONFIG_SOURCE_FILE)) + +export pkgconfig_dir PKG_CONFIG_FILE + +export prefix bindir src obj + +LIBS = -ldl + +LIBTRACECMD_DIR = $(obj)/lib/trace-cmd +LIBTRACECMD_STATIC = $(LIBTRACECMD_DIR)/libtracecmd.a +LIBTRACECMD_SHARED = $(LIBTRACECMD_DIR)/libtracecmd.so.$(LIBTRACECMD_VERSION) +LIBTRACECMD_SHARED_VERSION = $(shell echo $(LIBTRACECMD_SHARED) | sed -e 's/\(\.so\.[0-9]*\).*/\1/') +LIBTRACECMD_SHARED_SO = $(shell echo $(LIBTRACECMD_SHARED) | sed -e 's/\(\.so\).*/\1/') + +export LIBTRACECMD_STATIC LIBTRACECMD_SHARED +export LIBTRACECMD_SHARED_VERSION LIBTRACECMD_SHARED_SO + +LIBTRACEEVENT=libtraceevent +LIBTRACEFS=libtracefs + +TEST_LIBTRACEEVENT = $(shell sh -c "$(PKG_CONFIG) --atleast-version $(LIBTRACEEVENT_MIN_VERSION) $(LIBTRACEEVENT) > /dev/null 2>&1 && echo y") +TEST_LIBTRACEFS = $(shell sh -c "$(PKG_CONFIG) --atleast-version $(LIBTRACEFS_MIN_VERSION) $(LIBTRACEFS) > /dev/null 2>&1 && echo y") + +ifeq ("$(TEST_LIBTRACEEVENT)", "y") +LIBTRACEEVENT_CFLAGS = $(shell sh -c "$(PKG_CONFIG) --cflags $(LIBTRACEEVENT)") +LIBTRACEEVENT_LDLAGS = $(shell sh -c "$(PKG_CONFIG) --libs $(LIBTRACEEVENT)") +else +.PHONY: warning +warning: + @echo "********************************************" + @echo "** NOTICE: libtraceevent version $(LIBTRACEEVENT_MIN_VERSION) or higher not found on system" + @echo "**" + @echo "** Consider installing the latest libtraceevent from your" + @echo "** distribution, or from source:" + @echo "**" + @echo "** https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/ " + @echo "**" + @echo "********************************************" +endif + +export LIBTRACEEVENT_CFLAGS LIBTRACEEVENT_LDLAGS + +ifeq ("$(TEST_LIBTRACEFS)", "y") +LIBTRACEFS_CFLAGS = $(shell sh -c "$(PKG_CONFIG) --cflags $(LIBTRACEFS)") +LIBTRACEFS_LDLAGS = $(shell sh -c "$(PKG_CONFIG) --libs $(LIBTRACEFS)") +else +.PHONY: warning +warning: + @echo "********************************************" + @echo "** NOTICE: libtracefs version $(LIBTRACEFS_MIN_VERSION) or higher not found on system" + @echo "**" + @echo "** Consider installing the latest libtracefs from your" + @echo "** distribution, or from source:" + @echo "**" + @echo "** https://git.kernel.org/pub/scm/libs/libtrace/libtracefs.git/ " + @echo "**" + @echo "********************************************" +endif + +export LIBTRACEFS_CFLAGS LIBTRACEFS_LDLAGS + +TRACE_LIBS = -L$(LIBTRACECMD_DIR) -ltracecmd \ + $(LIBTRACEEVENT_LDLAGS) $(LIBTRACEFS_LDLAGS) + +export LIBS TRACE_LIBS +export LIBTRACECMD_DIR +export Q SILENT VERBOSE EXT + +# Include the utils +include scripts/utils.mk + +INCLUDES = -I$(src)/include -I$(src)/../../include +INCLUDES += -I$(src)/include/trace-cmd +INCLUDES += -I$(src)/lib/trace-cmd/include +INCLUDES += -I$(src)/lib/trace-cmd/include/private +INCLUDES += -I$(src)/tracecmd/include +INCLUDES += $(LIBTRACEEVENT_CFLAGS) +INCLUDES += $(LIBTRACEFS_CFLAGS) + +include $(src)/features.mk + +# Set compile option CFLAGS if not set elsewhere +CFLAGS ?= -g -Wall +CPPFLAGS ?= +LDFLAGS ?= + +ifndef NO_VSOCK +VSOCK_DEFINED := $(shell if (echo "$(pound)include <linux/vm_sockets.h>" | $(CC) -E - >/dev/null 2>&1) ; then echo 1; else echo 0 ; fi) +else +VSOCK_DEFINED := 0 +endif + +export VSOCK_DEFINED +ifeq ($(VSOCK_DEFINED), 1) +CFLAGS += -DVSOCK +endif + +PERF_DEFINED := $(shell if (echo "$(pound)include <linux/perf_event.h>" | $(CC) -E - >/dev/null 2>&1) ; then echo 1; else echo 0 ; fi) +export PERF_DEFINED +ifeq ($(PERF_DEFINED), 1) +CFLAGS += -DPERF +endif + +ZLIB_INSTALLED := $(shell if (printf "$(pound)include <zlib.h>\n void main(){deflateInit(NULL, Z_BEST_COMPRESSION);}" | $(CC) -o /dev/null -x c - -lz >/dev/null 2>&1) ; then echo 1; else echo 0 ; fi) +ifeq ($(ZLIB_INSTALLED), 1) +export ZLIB_INSTALLED +CFLAGS += -DHAVE_ZLIB +$(info Have zlib compression support) +endif + +TEST_LIBZSTD = $(shell sh -c "$(PKG_CONFIG) --atleast-version 1.4.0 libzstd > /dev/null 2>&1 && echo y") + +ifeq ("$(TEST_LIBZSTD)", "y") +LIBZSTD_CFLAGS = $(shell sh -c "$(PKG_CONFIG) --cflags libzstd") +LIBZSTD_LDLAGS = $(shell sh -c "$(PKG_CONFIG) --libs libzstd") +CFLAGS += -DHAVE_ZSTD +ZSTD_INSTALLED=1 +$(info Have ZSTD compression support) +else +$(info *************************************************************) +$(info ZSTD package not found, best compression algorithm not in use) +$(info *************************************************************) +endif + +export LIBZSTD_CFLAGS LIBZSTD_LDLAGS ZSTD_INSTALLED + +CUNIT_INSTALLED := $(shell if (printf "$(pound)include <CUnit/Basic.h>\n void main(){CU_initialize_registry();}" | $(CC) -o /dev/null -x c - -lcunit >/dev/null 2>&1) ; then echo 1; else echo 0 ; fi) +export CUNIT_INSTALLED + +export CFLAGS +export INCLUDES + +# Required CFLAGS +override CFLAGS += -D_GNU_SOURCE + +ifndef NO_PTRACE +ifneq ($(call try-cc,$(SOURCE_PTRACE),),y) + NO_PTRACE = 1 + override CFLAGS += -DWARN_NO_PTRACE +endif +endif + +ifdef NO_PTRACE +override CFLAGS += -DNO_PTRACE +endif + +ifndef NO_AUDIT +ifneq ($(call try-cc,$(SOURCE_AUDIT),-laudit),y) + NO_AUDIT = 1 + override CFLAGS += -DWARN_NO_AUDIT +endif +endif + +ifdef NO_AUDIT +override CFLAGS += -DNO_AUDIT +else +LIBS += -laudit +endif + +# Append required CFLAGS +override CFLAGS += $(INCLUDES) $(VAR_DIR) +override CFLAGS += $(PLUGIN_DIR_TRACECMD_SQ) +override CFLAGS += $(udis86-flags) $(blk-flags) +override LDFLAGS += $(udis86-ldflags) + +CMD_TARGETS = trace-cmd $(BUILD_PYTHON) + +### +# Default we just build trace-cmd +# +# If you want all libraries, then do: make libs +### + +all: all_cmd plugins show_other_make + +all_cmd: $(CMD_TARGETS) + +BUILD_PREFIX := $(BUILD_OUTPUT)/build_prefix + +$(BUILD_PREFIX): force + $(Q)$(call build_prefix,$(prefix)) + +$(PKG_CONFIG_FILE) : ${PKG_CONFIG_SOURCE_FILE}.template $(BUILD_PREFIX) $(VERSION_FILE) + $(Q) $(call do_make_pkgconfig_file,$(prefix)) + +trace-cmd: force $(LIBTRACECMD_STATIC) \ + force $(obj)/lib/trace-cmd/plugins/tracecmd_plugin_dir + $(Q)$(MAKE) -C $(src)/tracecmd $(obj)/tracecmd/$@ + +$(LIBTRACECMD_STATIC): force + $(Q)$(MAKE) -C $(src)/lib/trace-cmd $@ + +$(LIBTRACECMD_SHARED): force + $(Q)$(MAKE) -C $(src)/lib/trace-cmd libtracecmd.so + +libtracecmd.a: $(LIBTRACECMD_STATIC) +libtracecmd.so: $(LIBTRACECMD_SHARED) + +libs: $(LIBTRACECMD_SHARED) $(PKG_CONFIG_FILE) + +VERSION = $(LIBTC_VERSION) +PATCHLEVEL = $(LIBTC_PATCHLEVEL) +EXTRAVERSION = $(LIBTC_EXTRAVERSION) + +define make_version.h + (echo '/* This file is automatically generated. Do not modify. */'; \ + echo \#define VERSION_CODE $(shell \ + expr $(VERSION) \* 256 + $(PATCHLEVEL)); \ + echo '#define EXTRAVERSION ' $(EXTRAVERSION); \ + echo '#define VERSION_STRING "'$(VERSION).$(PATCHLEVEL).$(EXTRAVERSION)'"'; \ + ) > $1 +endef + +define update_version.h + ($(call make_version.h, $@.tmp); \ + if [ -r $@ ] && cmp -s $@ $@.tmp; then \ + rm -f $@.tmp; \ + else \ + echo ' UPDATE $@'; \ + mv -f $@.tmp $@; \ + fi); +endef + +$(VERSION_FILE): force + $(Q)$(call update_version.h) + +gui: force + @echo "***************************" + @echo " KernelShark has moved!" + @echo " Please use its new home at https://git.kernel.org/pub/scm/utils/trace-cmd/kernel-shark.git/" + @echo "***************************" + +test: force $(LIBTRACECMD_STATIC) +ifneq ($(CUNIT_INSTALLED),1) + $(error CUnit framework not installed, cannot build unit tests)) +endif + $(Q)$(MAKE) -C $(src)/utest $@ + +plugins_tracecmd: force $(obj)/lib/trace-cmd/plugins/tracecmd_plugin_dir + $(Q)$(MAKE) -C $(src)/lib/trace-cmd/plugins + +plugins: plugins_tracecmd + +$(obj)/lib/trace-cmd/plugins/tracecmd_plugin_dir: force + $(Q)$(MAKE) -C $(src)/lib/trace-cmd/plugins $@ + +show_other_make: + @echo "Note: to build man pages, type \"make doc\"" + @echo " to build unit tests, type \"make test\"" + +PHONY += show_other_make + +define find_tag_files + find . -name '\.pc' -prune -o -name '*\.[ch]' -print -o -name '*\.[ch]pp' \ + ! -name '\.#' -print +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_plugins_tracecmd: force + $(Q)$(MAKE) -C $(src)/lib/trace-cmd/plugins install_plugins + +install_plugins: install_plugins_tracecmd + +install_python: force + $(Q)$(MAKE) -C $(src)/python $@ + +install_bash_completion: force + $(Q)$(call do_install_data,$(src)/tracecmd/trace-cmd.bash,$(BASH_COMPLETE_DIR)) + +install_cmd: all_cmd install_plugins install_python install_bash_completion + $(Q)$(call do_install,$(obj)/tracecmd/trace-cmd,$(bindir_SQ)) + +install: install_cmd + @echo "Note: to install man pages, type \"make install_doc\"" + +install_gui: force + @echo "Nothing to do here." + @echo " Have you tried https://git.kernel.org/pub/scm/utils/trace-cmd/kernel-shark.git/" + +install_libs: libs + $(Q)$(MAKE) -C $(src)/lib/trace-cmd/ $@ + +doc: + $(MAKE) -C $(src)/Documentation all + +doc_clean: + $(MAKE) -C $(src)/Documentation clean + +install_doc: + $(MAKE) -C $(src)/Documentation install + +clean: + $(RM) *.o *~ *.a *.so .*.d + $(RM) tags TAGS cscope* $(PKG_CONFIG_SOURCE_FILE) $(VERSION_FILE) + $(MAKE) -C $(src)/lib/trace-cmd clean + $(MAKE) -C $(src)/lib/trace-cmd/plugins clean + $(MAKE) -C $(src)/utest clean + $(MAKE) -C $(src)/python clean + $(MAKE) -C $(src)/tracecmd clean + +define build_uninstall_script + $(Q)mkdir $(BUILD_OUTPUT)/tmp_build + $(Q)$(MAKE) -C $(src) DESTDIR=$(BUILD_OUTPUT)/tmp_build O=$(BUILD_OUTPUT) $1 > /dev/null + $(Q)find $(BUILD_OUTPUT)/tmp_build ! -type d -printf "%P\n" > $(BUILD_OUTPUT)/build_$2 + $(Q)$(RM) -rf $(BUILD_OUTPUT)/tmp_build +endef + +build_uninstall: $(BUILD_PREFIX) + $(call build_uninstall_script,install,uninstall) + +$(BUILD_OUTPUT)/build_uninstall: build_uninstall + +build_libs_uninstall: $(BUILD_PREFIX) + $(call build_uninstall_script,install_libs,libs_uninstall) + +$(BUILD_OUTPUT)/build_libs_uninstall: build_libs_uninstall + +define uninstall_file + if [ -f $(DESTDIR)/$1 -o -h $(DESTDIR)/$1 ]; then \ + $(call print_uninstall,$(DESTDIR)/$1)$(RM) $(DESTDIR)/$1; \ + fi; +endef + +uninstall: $(BUILD_OUTPUT)/build_uninstall + @$(foreach file,$(shell cat $(BUILD_OUTPUT)/build_uninstall),$(call uninstall_file,$(file))) + +uninstall_libs: $(BUILD_OUTPUT)/build_libs_uninstall + @$(foreach file,$(shell cat $(BUILD_OUTPUT)/build_libs_uninstall),$(call uninstall_file,$(file))) + +##### PYTHON STUFF ##### + +report_noswig: force + $(Q)echo + $(Q)echo " NO_PYTHON forced: swig not installed, not compiling python plugins" + $(Q)echo + +report_nopythondev: force + $(Q)echo + $(Q)echo " python-dev is not installed, not compiling python plugins" + $(Q)echo + +ifndef NO_PYTHON +PYTHON_INCLUDES = `$(PKG_CONFIG) --cflags $(PYTHON_PKGCONFIG_VERS)` +PYTHON_LDFLAGS = `$(PKG_CONFIG) --libs $(PYTHON_PKGCONFIG_VERS)` \ + $(shell $(PYTHON_VERS)-config --ldflags) +PYGTK_CFLAGS = `$(PKG_CONFIG) --cflags pygtk-2.0` +else +PYTHON_INCLUDES = +PYTHON_LDFLAGS = +PYGTK_CFLAGS = +endif + +export PYTHON_INCLUDES +export PYTHON_LDFLAGS +export PYGTK_CFLAGS + +ctracecmd.so: force $(LIBTRACECMD_STATIC) + $(Q)$(MAKE) -C $(src)/python $@ + +PHONY += python +python: $(PYTHON) + + +dist: + git archive --format=tar --prefix=trace-cmd-$(TRACECMD_VERSION)/ HEAD \ + > ../trace-cmd-$(TRACECMD_VERSION).tar + cat ../trace-cmd-$(TRACECMD_VERSION).tar | \ + bzip2 -c9 > ../trace-cmd-$(TRACECMD_VERSION).tar.bz2 + cat ../trace-cmd-$(TRACECMD_VERSION).tar | \ + xz -e -c8 > ../trace-cmd-$(TRACECMD_VERSION).tar.xz + +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) |