Openwrt/rules.mk
Felix Fietkau 97258f5363 build: add ninja build tool and make it available for cmake
ninja is faster at building cmake packages than make, and according to reports
also more reliable at handling parallel builds
This commit includes a patch that adds GNU make jobserver support, in order to
allow more precise control over the number of parallel tasks

Enable parallel build by default for packages using ninja

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Rosen Penev <rosenp@gmail.com>
2021-06-12 10:46:39 +02:00

465 lines
14 KiB
Makefile

# SPDX-License-Identifier: GPL-2.0-only
#
# Copyright (C) 2006-2010 OpenWrt.org
# Copyright (C) 2016 LEDE Project
ifneq ($(__rules_inc),1)
__rules_inc=1
ifeq ($(DUMP),)
-include $(TOPDIR)/.config
endif
include $(TOPDIR)/include/debug.mk
include $(TOPDIR)/include/verbose.mk
ifneq ($(filter check,$(MAKECMDGOALS)),)
CHECK:=1
DUMP:=1
endif
export TMP_DIR:=$(TOPDIR)/tmp
export TMPDIR:=$(TMP_DIR)
qstrip=$(strip $(subst ",,$(1)))
#"))
empty:=
space:= $(empty) $(empty)
comma:=,
merge=$(subst $(space),,$(1))
confvar=$(shell echo '$(foreach v,$(1),$(v)=$(subst ','\'',$($(v))))' | $(MKHASH) md5)
strip_last=$(patsubst %.$(lastword $(subst .,$(space),$(1))),%,$(1))
paren_left = (
paren_right = )
chars_lower = a b c d e f g h i j k l m n o p q r s t u v w x y z
chars_upper = A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
define sep
endef
define newline
endef
__tr_list = $(join $(join $(1),$(foreach char,$(1),$(comma))),$(2))
__tr_head_stripped = $(subst $(space),,$(foreach cv,$(call __tr_list,$(1),$(2)),$$$(paren_left)subst$(cv)$(comma)))
__tr_head = $(subst $(paren_left)subst,$(paren_left)subst$(space),$(__tr_head_stripped))
__tr_tail = $(subst $(space),,$(foreach cv,$(1),$(paren_right)))
__tr_template = $(__tr_head)$$(1)$(__tr_tail)
$(eval toupper = $(call __tr_template,$(chars_lower),$(chars_upper)))
$(eval tolower = $(call __tr_template,$(chars_upper),$(chars_lower)))
version_abbrev = $(if $(if $(CHECK),,$(DUMP)),$(1),$(shell printf '%.8s' $(1)))
_SINGLE=export MAKEFLAGS=$(space);
CFLAGS:=
ARCH:=$(subst i486,i386,$(subst i586,i386,$(subst i686,i386,$(call qstrip,$(CONFIG_ARCH)))))
ARCH_PACKAGES:=$(call qstrip,$(CONFIG_TARGET_ARCH_PACKAGES))
BOARD:=$(call qstrip,$(CONFIG_TARGET_BOARD))
SUBTARGET:=$(call qstrip,$(CONFIG_TARGET_SUBTARGET))
TARGET_OPTIMIZATION:=$(call qstrip,$(CONFIG_TARGET_OPTIMIZATION))
export EXTRA_OPTIMIZATION:=$(filter-out -fno-plt,$(call qstrip,$(CONFIG_EXTRA_OPTIMIZATION)))
TARGET_SUFFIX=$(call qstrip,$(CONFIG_TARGET_SUFFIX))
BUILD_SUFFIX:=$(call qstrip,$(CONFIG_BUILD_SUFFIX))
SUBDIR:=$(patsubst $(TOPDIR)/%,%,${CURDIR})
BUILD_SUBDIR:=$(patsubst $(TOPDIR)/%,%,${CURDIR})
NPROC:=$(shell sysctl -n hw.ncpu 2>/dev/null || nproc)
export SHELL:=/usr/bin/env bash
IS_PACKAGE_BUILD := $(if $(filter package/%,$(BUILD_SUBDIR)),1)
OPTIMIZE_FOR_CPU=$(subst i386,i486,$(ARCH))
ifneq (,$(findstring $(ARCH) , aarch64 aarch64_be powerpc ))
FPIC:=-DPIC -fPIC
else
FPIC:=-DPIC -fpic
endif
HOST_FPIC:=-DPIC -fPIC
ARCH_SUFFIX:=$(call qstrip,$(CONFIG_CPU_TYPE))
GCC_ARCH:=
ifneq ($(ARCH_SUFFIX),)
ARCH_SUFFIX:=_$(ARCH_SUFFIX)
endif
ifneq ($(filter -march=armv%,$(TARGET_OPTIMIZATION)),)
GCC_ARCH:=$(patsubst -march=%,%,$(filter -march=armv%,$(TARGET_OPTIMIZATION)))
endif
ifdef CONFIG_HAS_SPE_FPU
TARGET_SUFFIX:=$(TARGET_SUFFIX)spe
endif
ifdef CONFIG_MIPS64_ABI
ifneq ($(CONFIG_MIPS64_ABI_O32),y)
ARCH_SUFFIX:=$(ARCH_SUFFIX)_$(call qstrip,$(CONFIG_MIPS64_ABI))
endif
endif
DEFAULT_SUBDIR_TARGETS:=clean download prepare compile update refresh prereq dist distcheck configure check check-depends
define DefaultTargets
$(foreach t,$(DEFAULT_SUBDIR_TARGETS) $(1),
.$(t):
$(t): .$(t)
.PHONY: $(t) .$(t)
)
endef
DL_DIR:=$(if $(call qstrip,$(CONFIG_DOWNLOAD_FOLDER)),$(call qstrip,$(CONFIG_DOWNLOAD_FOLDER)),$(TOPDIR)/dl)
OUTPUT_DIR:=$(if $(call qstrip,$(CONFIG_BINARY_FOLDER)),$(call qstrip,$(CONFIG_BINARY_FOLDER)),$(TOPDIR)/bin)
BIN_DIR:=$(OUTPUT_DIR)/targets/$(BOARD)/$(SUBTARGET)
INCLUDE_DIR:=$(TOPDIR)/include
SCRIPT_DIR:=$(TOPDIR)/scripts
BUILD_DIR_BASE:=$(TOPDIR)/build_dir
ifeq ($(CONFIG_EXTERNAL_TOOLCHAIN),)
GCCV:=$(call qstrip,$(CONFIG_GCC_VERSION))
LIBC:=$(call qstrip,$(CONFIG_LIBC))
REAL_GNU_TARGET_NAME=$(OPTIMIZE_FOR_CPU)-openwrt-linux$(if $(TARGET_SUFFIX),-$(TARGET_SUFFIX))
GNU_TARGET_NAME=$(OPTIMIZE_FOR_CPU)-openwrt-linux
DIR_SUFFIX:=_$(LIBC)$(if $(CONFIG_arm),_eabi)
BIN_DIR:=$(BIN_DIR)$(if $(CONFIG_USE_MUSL),,-$(LIBC))
TARGET_DIR_NAME = target-$(ARCH)$(ARCH_SUFFIX)$(DIR_SUFFIX)$(if $(BUILD_SUFFIX),_$(BUILD_SUFFIX))
TOOLCHAIN_DIR_NAME = toolchain-$(ARCH)$(ARCH_SUFFIX)_gcc-$(GCCV)$(DIR_SUFFIX)
else
ifeq ($(CONFIG_NATIVE_TOOLCHAIN),)
GNU_TARGET_NAME=$(call qstrip,$(CONFIG_TARGET_NAME))
else
GNU_TARGET_NAME=$(shell gcc -dumpmachine)
endif
REAL_GNU_TARGET_NAME=$(GNU_TARGET_NAME)
LIBC:=$(call qstrip,$(CONFIG_LIBC))
TARGET_DIR_NAME:=target-$(GNU_TARGET_NAME)_$(LIBC)$(if $(BUILD_SUFFIX),_$(BUILD_SUFFIX))
TOOLCHAIN_DIR_NAME:=toolchain-$(GNU_TARGET_NAME)
endif
ifeq ($(or $(CONFIG_EXTERNAL_TOOLCHAIN),$(CONFIG_TARGET_uml)),)
ifeq ($(CONFIG_GCC_USE_IREMAP),y)
iremap = -iremap$(1):$(2)
else
iremap = -f$(if $(CONFIG_REPRODUCIBLE_DEBUG_INFO),file,macro)-prefix-map=$(1)=$(2)
endif
endif
PACKAGE_DIR:=$(BIN_DIR)/packages
PACKAGE_DIR_ALL:=$(TOPDIR)/staging_dir/packages/$(BOARD)
BUILD_DIR:=$(BUILD_DIR_BASE)/$(TARGET_DIR_NAME)
STAGING_DIR:=$(TOPDIR)/staging_dir/$(TARGET_DIR_NAME)
BUILD_DIR_TOOLCHAIN:=$(BUILD_DIR_BASE)/$(TOOLCHAIN_DIR_NAME)
TOOLCHAIN_DIR:=$(TOPDIR)/staging_dir/$(TOOLCHAIN_DIR_NAME)
STAMP_DIR:=$(BUILD_DIR)/stamp
STAMP_DIR_HOST=$(BUILD_DIR_HOST)/stamp
TARGET_ROOTFS_DIR?=$(if $(call qstrip,$(CONFIG_TARGET_ROOTFS_DIR)),$(call qstrip,$(CONFIG_TARGET_ROOTFS_DIR)),$(BUILD_DIR))
TARGET_DIR:=$(TARGET_ROOTFS_DIR)/root-$(BOARD)
STAGING_DIR_ROOT:=$(STAGING_DIR)/root-$(BOARD)
STAGING_DIR_IMAGE:=$(STAGING_DIR)/image
BUILD_LOG_DIR:=$(if $(call qstrip,$(CONFIG_BUILD_LOG_DIR)),$(call qstrip,$(CONFIG_BUILD_LOG_DIR)),$(TOPDIR)/logs)
PKG_INFO_DIR := $(STAGING_DIR)/pkginfo
BUILD_DIR_HOST:=$(if $(IS_PACKAGE_BUILD),$(BUILD_DIR_BASE)/hostpkg,$(BUILD_DIR_BASE)/host)
STAGING_DIR_HOST:=$(TOPDIR)/staging_dir/host
STAGING_DIR_HOSTPKG:=$(TOPDIR)/staging_dir/hostpkg
TARGET_PATH:=$(subst $(space),:,$(filter-out .,$(filter-out ./,$(subst :,$(space),$(PATH)))))
TARGET_INIT_PATH:=$(call qstrip,$(CONFIG_TARGET_INIT_PATH))
TARGET_INIT_PATH:=$(if $(TARGET_INIT_PATH),$(TARGET_INIT_PATH),/usr/sbin:/sbin:/usr/bin:/bin)
TARGET_CFLAGS:=$(TARGET_OPTIMIZATION)$(if $(CONFIG_DEBUG), -g3) $(call qstrip,$(CONFIG_EXTRA_OPTIMIZATION))
TARGET_CXXFLAGS = $(TARGET_CFLAGS)
TARGET_ASFLAGS_DEFAULT = $(TARGET_CFLAGS)
TARGET_ASFLAGS = $(TARGET_ASFLAGS_DEFAULT)
ifneq ($(CONFIG_EXTERNAL_TOOLCHAIN),)
LIBGCC_S_PATH=$(realpath $(wildcard $(call qstrip,$(CONFIG_LIBGCC_ROOT_DIR))/$(call qstrip,$(CONFIG_LIBGCC_FILE_SPEC))))
LIBGCC_S=$(if $(LIBGCC_S_PATH),-L$(dir $(LIBGCC_S_PATH)) -lgcc_s)
LIBGCC_A=$(realpath $(lastword $(wildcard $(dir $(LIBGCC_S_PATH))/gcc/*/*/libgcc.a)))
else
LIBGCC_A=$(lastword $(wildcard $(TOOLCHAIN_DIR)/lib/gcc/*/*/libgcc.a))
LIBGCC_S=$(if $(wildcard $(TOOLCHAIN_DIR)/lib/libgcc_s.so),-L$(TOOLCHAIN_DIR)/lib -lgcc_s,$(LIBGCC_A))
endif
ifeq ($(CONFIG_ARCH_64BIT),y)
LIB_SUFFIX:=64
endif
ifndef DUMP
ifeq ($(CONFIG_EXTERNAL_TOOLCHAIN),)
-include $(TOOLCHAIN_DIR)/info.mk
export GCC_HONOUR_COPTS:=0
TARGET_CROSS:=$(if $(TARGET_CROSS),$(TARGET_CROSS),$(OPTIMIZE_FOR_CPU)-openwrt-linux$(if $(TARGET_SUFFIX),-$(TARGET_SUFFIX))-)
TARGET_CFLAGS+= -fhonour-copts -Wno-error=unused-but-set-variable -Wno-error=unused-result
TARGET_CPPFLAGS+= -I$(TOOLCHAIN_DIR)/usr/include
ifeq ($(CONFIG_USE_MUSL),y)
TARGET_CPPFLAGS+= -I$(TOOLCHAIN_DIR)/include/fortify
endif
TARGET_CPPFLAGS+= -I$(TOOLCHAIN_DIR)/include
TARGET_LDFLAGS+= -L$(TOOLCHAIN_DIR)/usr/lib -L$(TOOLCHAIN_DIR)/lib
TARGET_PATH:=$(TOOLCHAIN_DIR)/bin:$(TARGET_PATH)
else
ifeq ($(CONFIG_NATIVE_TOOLCHAIN),)
TARGET_CROSS:=$(call qstrip,$(CONFIG_TOOLCHAIN_PREFIX))
TOOLCHAIN_ROOT_DIR:=$(call qstrip,$(CONFIG_TOOLCHAIN_ROOT))
TOOLCHAIN_BIN_DIRS:=$(patsubst ./%,$(TOOLCHAIN_ROOT_DIR)/%,$(call qstrip,$(CONFIG_TOOLCHAIN_BIN_PATH)))
TOOLCHAIN_INC_DIRS:=$(patsubst ./%,$(TOOLCHAIN_ROOT_DIR)/%,$(call qstrip,$(CONFIG_TOOLCHAIN_INC_PATH)))
TOOLCHAIN_LIB_DIRS:=$(patsubst ./%,$(TOOLCHAIN_ROOT_DIR)/%,$(call qstrip,$(CONFIG_TOOLCHAIN_LIB_PATH)))
ifneq ($(TOOLCHAIN_BIN_DIRS),)
TARGET_PATH:=$(subst $(space),:,$(TOOLCHAIN_BIN_DIRS)):$(TARGET_PATH)
endif
ifneq ($(TOOLCHAIN_INC_DIRS),)
TARGET_CPPFLAGS+= $(patsubst %,-I%,$(TOOLCHAIN_INC_DIRS))
endif
ifneq ($(TOOLCHAIN_LIB_DIRS),)
TARGET_LDFLAGS+= $(patsubst %,-L%,$(TOOLCHAIN_LIB_DIRS))
endif
TARGET_PATH:=$(TOOLCHAIN_DIR)/bin:$(TARGET_PATH)
endif
endif
endif
TARGET_PATH_PKG:=$(STAGING_DIR)/host/bin:$(STAGING_DIR_HOSTPKG)/bin:$(TARGET_PATH)
ifeq ($(CONFIG_SOFT_FLOAT),y)
SOFT_FLOAT_CONFIG_OPTION:=--with-float=soft
ifeq ($(CONFIG_arm),y)
TARGET_CFLAGS+= -mfloat-abi=soft
else
TARGET_CFLAGS+= -msoft-float
endif
else
SOFT_FLOAT_CONFIG_OPTION:=
ifeq ($(CONFIG_arm),y)
TARGET_CFLAGS+= -mfloat-abi=hard
endif
endif
export PATH:=$(TARGET_PATH)
export STAGING_DIR STAGING_DIR_HOST STAGING_DIR_HOSTPKG
export SH_FUNC:=. $(INCLUDE_DIR)/shell.sh;
PKG_CONFIG:=$(STAGING_DIR_HOST)/bin/pkg-config
export PKG_CONFIG
HOSTCC:=gcc
HOSTCXX:=g++
HOST_CPPFLAGS:=-I$(STAGING_DIR_HOST)/include $(if $(IS_PACKAGE_BUILD),-I$(STAGING_DIR_HOSTPKG)/include -I$(STAGING_DIR)/host/include)
HOST_CFLAGS:=-O2 $(HOST_CPPFLAGS)
HOST_LDFLAGS:=-L$(STAGING_DIR_HOST)/lib $(if $(IS_PACKAGE_BUILD),-L$(STAGING_DIR_HOSTPKG)/lib -L$(STAGING_DIR)/host/lib)
ifeq ($(CONFIG_EXTERNAL_TOOLCHAIN),)
TARGET_AR:=$(TARGET_CROSS)gcc-ar
TARGET_RANLIB:=$(TARGET_CROSS)gcc-ranlib
TARGET_NM:=$(TARGET_CROSS)gcc-nm
else
TARGET_AR:=$(TARGET_CROSS)ar
TARGET_RANLIB:=$(TARGET_CROSS)ranlib
TARGET_NM:=$(TARGET_CROSS)nm
endif
BUILD_KEY=$(TOPDIR)/key-build
FAKEROOT:=$(STAGING_DIR_HOST)/bin/fakeroot
TARGET_CC:=$(TARGET_CROSS)gcc
TARGET_CXX:=$(TARGET_CROSS)g++
KPATCH:=$(SCRIPT_DIR)/patch-kernel.sh
SED:=$(STAGING_DIR_HOST)/bin/sed -i -e
ESED:=$(STAGING_DIR_HOST)/bin/sed -E -i -e
MKHASH:=$(STAGING_DIR_HOST)/bin/mkhash
# MKHASH is used in /scripts, so we export it here.
export MKHASH
CP:=cp -fpR
LN:=ln -sf
XARGS:=xargs -r
BASH:=bash
TAR:=tar
FIND:=find
PATCH:=patch
PYTHON:=python
INSTALL_BIN:=install -m0755
INSTALL_SUID:=install -m4755
INSTALL_DIR:=install -d -m0755
INSTALL_DATA:=install -m0644
INSTALL_CONF:=install -m0600
TARGET_CC_NOCACHE:=$(TARGET_CC)
TARGET_CXX_NOCACHE:=$(TARGET_CXX)
HOSTCC_NOCACHE:=$(HOSTCC)
HOSTCXX_NOCACHE:=$(HOSTCXX)
export TARGET_CC_NOCACHE
export TARGET_CXX_NOCACHE
export HOSTCC_NOCACHE
export HOSTCXX_NOCACHE
ifneq ($(CONFIG_CCACHE),)
TARGET_CC:= ccache_cc
TARGET_CXX:= ccache_cxx
HOSTCC:= ccache $(HOSTCC)
HOSTCXX:= ccache $(HOSTCXX)
export CCACHE_BASEDIR:=$(TOPDIR)
export CCACHE_DIR:=$(if $(call qstrip,$(CONFIG_CCACHE_DIR)),$(call qstrip,$(CONFIG_CCACHE_DIR)),$(TOPDIR)/.ccache)
export CCACHE_COMPILERCHECK:=%compiler% -dumpmachine; %compiler% -dumpversion
endif
TARGET_CONFIGURE_OPTS = \
AR="$(TARGET_AR)" \
AS="$(TARGET_CC) -c $(TARGET_ASFLAGS)" \
LD=$(TARGET_CROSS)ld \
NM="$(TARGET_NM)" \
CC="$(TARGET_CC)" \
GCC="$(TARGET_CC)" \
CXX="$(TARGET_CXX)" \
RANLIB="$(TARGET_RANLIB)" \
STRIP=$(TARGET_CROSS)strip \
OBJCOPY=$(TARGET_CROSS)objcopy \
OBJDUMP=$(TARGET_CROSS)objdump \
SIZE=$(TARGET_CROSS)size
# strip an entire directory
ifneq ($(CONFIG_NO_STRIP),)
RSTRIP:=:
STRIP:=:
else
ifneq ($(CONFIG_USE_STRIP),)
STRIP:=$(TARGET_CROSS)strip $(call qstrip,$(CONFIG_STRIP_ARGS))
else
ifneq ($(CONFIG_USE_SSTRIP),)
STRIP:=$(STAGING_DIR_HOST)/bin/sstrip $(call qstrip,$(CONFIG_SSTRIP_ARGS))
endif
endif
RSTRIP= \
export CROSS="$(TARGET_CROSS)" \
$(if $(PKG_BUILD_ID),KEEP_BUILD_ID=1) \
$(if $(CONFIG_KERNEL_KALLSYMS),NO_RENAME=1) \
$(if $(CONFIG_KERNEL_PROFILING),KEEP_SYMBOLS=1); \
NM="$(TARGET_CROSS)nm" \
STRIP="$(STRIP)" \
STRIP_KMOD="$(SCRIPT_DIR)/strip-kmod.sh" \
PATCHELF="$(STAGING_DIR_HOST)/bin/patchelf" \
$(SCRIPT_DIR)/rstrip.sh
endif
NINJA = \
MAKEFLAGS="$(MAKE_JOBSERVER)" \
$(STAGING_DIR_HOST)/bin/ninja \
$(if $(findstring c,$(OPENWRT_VERBOSE)),-v) \
$(if $(MAKE_JOBSERVER),,-j1)
ifeq ($(CONFIG_IPV6),y)
DISABLE_IPV6:=
else
DISABLE_IPV6:=--disable-ipv6
endif
TAR_OPTIONS:=-xf -
ifeq ($(CONFIG_BUILD_LOG),y)
BUILD_LOG:=1
endif
export BISON_PKGDATADIR:=$(STAGING_DIR_HOST)/share/bison
export M4:=$(STAGING_DIR_HOST)/bin/m4
define shvar
V_$(subst .,_,$(subst -,_,$(subst /,_,$(1))))
endef
define shexport
export $(call shvar,$(1))=$$(call $(1))
endef
# Execute commands under flock
# $(1) => The shell expression.
# $(2) => The lock name. If not given, the global lock will be used.
ifneq ($(wildcard $(STAGING_DIR_HOST)/bin/flock),)
define locked
SHELL= \
flock \
$(TMP_DIR)/.$(if $(2),$(strip $(2)),global).flock \
-c '$(subst ','\'',$(1))'
endef
else
locked=$(1)
endif
# Recursively copy paths into another directory, purge dangling
# symlinks before.
# $(1) => File glob expression
# $(2) => Destination directory
define file_copy
for src_dir in $(sort $(foreach d,$(wildcard $(1)),$(dir $(d)))); do \
( cd $$src_dir; find -type f -or -type d ) | \
( cd $(2); while :; do \
read FILE; \
[ -z "$$FILE" ] && break; \
[ -L "$$FILE" ] || continue; \
echo "Removing symlink $(2)/$$FILE"; \
rm -f "$$FILE"; \
done; ); \
done; \
$(CP) $(1) $(2)
endef
# Calculate sha256sum of any plain file within a given directory
# $(1) => Input directory
# $(2) => If set, recurse into subdirectories
define sha256sums
(cd $(1); find . $(if $(2),,-maxdepth 1) -type f -not -name 'sha256sums' -printf "%P\n" | sort | \
xargs -r $(MKHASH) -n sha256 | sed -ne 's!^\(.*\) \(.*\)$$!\1 *\2!p' > sha256sums)
endef
# file extension
ext=$(word $(words $(subst ., ,$(1))),$(subst ., ,$(1)))
# Count Git commits of a package
# $(1) => if non-empty: count commits since last ": [uU]pdate to " or ": [bB]ump to " in commit message
define commitcount
$(shell \
if git log -1 >/dev/null 2>/dev/null; then \
if [ -n "$(1)" ]; then \
last_bump="$$(git log --pretty=format:'%h %s' . | \
grep --max-count=1 -e ': [uU]pdate to ' -e ': [bB]ump to ' | \
cut -f 1 -d ' ')"; \
fi; \
if [ -n "$$last_bump" ]; then \
echo -n $$(($$(git rev-list --count "$$last_bump..HEAD" .) + 1)); \
else \
git rev-list --count HEAD .; \
fi; \
else \
secs="$$(($(SOURCE_DATE_EPOCH) % 86400))"; \
date="$$(date --utc --date="@$(SOURCE_DATE_EPOCH)" "+%y%m%d")"; \
printf '%s.%05d' "$$date" "$$secs"; \
fi; \
)
endef
abi_version_str = $(subst -,,$(subst _,,$(subst .,,$(1))))
COMMITCOUNT = $(if $(DUMP),0,$(call commitcount))
AUTORELEASE = $(if $(DUMP),0,$(call commitcount,1))
all:
FORCE: ;
.PHONY: FORCE
check: FORCE
@true
val.%:
@$(if $(filter undefined,$(origin $*)),\
echo "$* undefined" >&2, \
echo '$(subst ','"'"',$($*))' \
)
var.%:
@$(if $(filter undefined,$(origin $*)),\
echo "$* undefined" >&2, \
echo "$*='"'$(subst ','"'\"'\"'"',$($*))'"'" \
)
endif #__rules_inc