define Append_Conditional
$(if $(strip $(foreach V,$(4),$(filter -D$(V),$(CFLAGS)))),, \
    $(if \
        $(if $(strip $(3)),,x)$(findstring $(foreach U,$(3),-D$(U)),$(foreach U,$(3),$(filter -D$(U),$(CFLAGS)))), \
            $(eval $(strip $(1)) += $(2)) \
    ) \
)
endef

define Dump_Var
	NUM=`echo "$(strip $($(1)))"|awk '{ print NF }'`; \
	if (( $${NUM} \> 1 )); then \
	    printf -- "-----------------------------------------------------------------\n"; \
	    printf "%-24s| %s\n" ". $(1)" `echo "$(strip $($(1)))"|cut -d' ' -f1|$(SED) 's/^ *//'`; \
	    for i in `echo "$(strip $($(1)))"|cut -d' ' -f2-`; do \
	        printf "%-24s| %s\n" "" "$${i}"; \
	    done; \
	    printf -- "-----------------------------------------------------------------\n"; \
	else \
	    printf "%-24s| %s\n" ". $(1)" "$(strip $($(1)))"; \
	fi;
endef

ifneq (,$(Q))
define Inspect_Env
endef
else
define Inspect_Env
	@printf -- "-----------------------------------------------------------------\n"
	@printf "%-20s| %s\n" ". BUILDING_TARGET" "$@"
	@printf -- "-----------------------------------------------------------------\n"
	@printf "%-20s| %s\n" ". BUILDING_DEPEND" "$(filter-out FORCE,$^)"
	@printf -- "-----------------------------------------------------------------\n"
	@$(foreach var,$(1),$(call Dump_Var,$(var)))
	@printf -- "-----------------------------------------------------------------\n"
endef
endif

# 31, red. 32, green. 33, yellow. 34, blue. 35, magenta. 36, cyan. 37, white.
define Brief_Log
( \
	if [ "$1" = "CC" ]; then \
	    if echo "$@"|grep -q "\.so$$"; then \
	        COLOR_MARK="\033[1;32m"; \
	    elif echo "$@"|grep -q "\.ko$$"; then \
	        COLOR_MARK="\033[1;35m"; \
	    else \
	        COLOR_MARK="\033[1;36m"; \
	    fi \
	elif [ "$1" = "AR" ]; then \
	    COLOR_MARK="\033[1;33m"; \
	elif [ "$1" = "LD" ]; then \
	    COLOR_MARK="\033[1;31m"; \
	elif [ "$1" = "ST" ]; then \
	    COLOR_MARK="\033[0;33m"; \
	fi; \
	if [ "$(PLAIN_LOG)" != "1" ]; then \
	    echo -ne "$${COLOR_MARK}"; \
	fi; \
	if [ "$2" = "" ]; then \
	    FIRST_DEP="$(firstword $(filter-out FORCE,$?))"; \
	    SPACE_BAR="                                   "; \
	    if [ "$${FIRST_DEP}" != "" ]; then \
	        FIRST_DEP="$$(basename $${FIRST_DEP})"; \
	    fi; \
	    printf "\r%-40s%s%s$(3)\n" "[$1] $$(echo -n "$$(basename $@)" | cut -c1-28)" "<= $${FIRST_DEP} $${SPACE_BAR}"; \
	else \
	    printf "\r%-40s%s%s$(3)\n" "[$1] $$(echo -n "$(2)" | cut -c1-28)" "<= $${FIRST_DEP} $${SPACE_BAR}"; \
	fi; \
	if [ "$3" != "..." ]; then \
	    for i in $(wordlist 2,150,$(filter-out FORCE,$?)); do \
	        if [ "$$(echo $${i}|cut -c1)" != "/" ]; then \
	            printf "%-40s%s$(3)\n" "" "   $$(basename $${i})"; \
	        fi \
	    done; \
	fi; \
	if [ "$(PLAIN_LOG)" != "1" ]; then \
	    echo -ne "\033[0m"; \
	fi; \
)
endef

define Copy_Headers
	$(Q) \
	if [ "$(strip $(1))" != "" ]; then \
	    mkdir -p $(2)/$(3); \
	    for hdr in $(1); do \
	        if [ ! -f $(2)/$(3)/$${hdr} ] || [ $${PWD}/$${hdr} -nt $(2)/$(3)/$${hdr} ]; then \
	            mkdir -p $(2)/$(3); \
	            cp -f $(TOP_DIR)/$(MODULE_NAME)/$${hdr} $(2)/$(3)/$$(basename $${hdr}); \
	        fi; \
	    done \
	fi
endef

define Update_Extra_Srcs
( \
	for ELEM in $(strip $(1)); do \
	    DST=$(OUTPUT_DIR)/$(2)/$$(basename $${ELEM}); \
	    if [ $${ELEM} -nt $${DST} ]; then \
	        cp -Lf $${ELEM} $${DST}; \
	    fi; \
	done \
)
endef

define Require_Build
( \
    SW=$$(grep -m 1 "^PKG_SWITCH_$(1) =" $(STAMP_BLD_VAR)|awk '{ print $$NF }'); \
    [ "$${SW}" != "y" ] && \
        echo "FALSE" && exit; set +x; \
\
    [ "$(LIBA_TARGET_$(1))" != "" ] && \
    $(foreach L,$(LIBA_TARGET_$(1)),[ -f $(IMPORT_VDRDIR)/$(PREBUILT_LIBDIR)/$(L) ] && ) \
            echo "FALSE" && exit; \
\
    [ "$(LIBSO_TARGET_$(1))" != "" ] && \
    [ -f $(IMPORT_VDRDIR)/$(PREBUILT_LIBDIR)/$(LIBSO_TARGET_$(1)) ] && \
            echo "FALSE" && exit; \
\
    echo "TRUE"; \
)
endef

define Build_Depends
( \
    set -o pipefail && \
    for i in $(DEPENDS_$(1)); do \
        STAMP=$(STAMP_DIR)/$$(echo $${i}|$(SED) 's:/:~:g').build.done; \
        if [ -f $${STAMP} ]; then \
            continue; \
        fi; \
        $(MAKE) --no-print-directory $${i} \
            $(if $(Q),,2>&1|tee -a $(OUTPUT_DIR)/$${i}/$(COMPILE_LOG)) \
            $(if $(Q),,2>&1|tee -a $(OUTPUT_DIR)/$(COMPILE_LOG)); \
        RETVAL=$$?; \
        if [ $${RETVAL} != 0 ]; then \
            exit $${RETVAL}; \
        fi; \
    done \
\
)
endef

#
#	    ($(foreach d,$(COMP_LIB_COMPONENTS), \
#
#	        $(RECURSIVE_MAKE) pre-build target-$(d) && \
#	        $(MAKE) --no-print-directory -C $(OUTPUT_DIR)/$(d) $(LIBA_TARGET_$(d)) \
#	            $(if $(Q),,2>&1|tee -a $(OUTPUT_DIR)/$(d)/$(COMPILE_LOG)) \
#	            $(if $(Q),,2>&1|tee -a $(OUTPUT_DIR)/$(COMPILE_LOG)) \
#	        ; \
#
#	        if [ $$? != 0 ]; then \
#
# KEEP SEPA-LIBS:
#
# rm -f $(SYSROOT_LIB)/$(firstword $(LIBA_TARGET_$(d))) $(SYSROOT_LIB)/$(firstword $(LIBSO_TARGET_$(d))) 2>/dev/null; \
#

ifdef COMP_LIB
define Build_CompLib
( \
    if  [ "$(strip $(1))" = "FORCE" ] || \
        [ "$$(echo $(LDFLAGS_$(strip $(1)))|grep -wo -- '-l$(COMP_LIB_NAME)')" != "" ]; then \
    ( \
        $(foreach d,$(COMP_LIB_COMPONENTS), \
            [ -f $(STAMP_DIR)/$(subst /,~,$(d)).build.done ] || \
            set -o pipefail && \
            $(MAKE) --no-print-directory -C $(OUTPUT_DIR)/$(d) $(firstword $(LIBA_TARGET_$(d))) $(firstword $(LIBSO_TARGET_$(d))) && set +x; \
            RETVAL=$$?; \
            if [ $${RETVAL} != 0 ]; then \
                exit $${RETVAL}; \
            fi; \
        ) \
    ); \
    if  [ ! -f $(SYSROOT_LIB)/$(COMP_LIB) ]; then \
        $(call Info_CompLib,$(COMP_LIB_NAME),$(COMP_LIB_OBJS)); \
    fi; \
    $(call Finalize_CompLib,$(COMP_LIB_OBJS),$(SYSROOT_LIB),$(COMP_LIB_NAME)); \
    fi \
)
endef
else
define Build_CompLib
true
endef
endif

define Relative_TcPath
( \
    case $(1) in \
        xtensa-lx106-elf-gcc ) \
            echo "gcc-xtensa-lx106-linux/main/bin" ;; \
        arm-none-eabi-gcc ) \
            echo "gcc-arm-none-eabi-linux/main/bin" ;; \
    esac \
)
endef

define Gitrepo_TcPath
( \
    case $(1) in \
        xtensa-lx106-elf-gcc ) \
            echo "gcc-xtensa-lx106-linux" ;; \
        arm-none-eabi-gcc ) \
            echo "gcc-arm-none-eabi-linux" ;; \
    esac \
)
endef

define CompLib_Map
$(eval \
    COMP_LIB_COMPONENTS += \
        $(if \
            $(filter y,$($(strip $(1)))),$(foreach M,$(strip $(2)),$(if $(filter $(strip $(M)),$(COMP_LIB_COMPONENTS)),,$(strip $(M)))) \
        ) \
)
endef

OMIT_GOALS := distclean clean env help config reconfig menuconfig

ifeq (,$(filter $(OMIT_GOALS),$(MAKECMDGOALS)))
define Conflict_Relation
$(if $(filter y,$($(strip $(1)))), \
    $(if $(filter y,$($(strip $(2)))), \
        $(error INVALID CONFIG: '$(strip $(1)) = $($(strip $(1)))' conflicts with '$(strip $(2)) = $($(strip $(2)))' at same time!), \
    ), \
)
endef

define Present1_Relation
$(if $(filter n,$($(strip $(1)))), \
    $(if $(filter n,$($(strip $(2)))), \
        $(error INVALID CONFIG: '$(strip $(1)) = $($(strip $(1)))' conflicts with '$(strip $(2)) = $($(strip $(2)))' at same time!), \
    ), \
)
endef

define Requires_Relation
$(if $(filter y,$($(strip $(1)))), \
    $(if $(filter y,$($(strip $(2)))),, \
        $(error INVALID CONFIG: '$(strip $(2)) = $($(strip $(2)))' breaks dependency since '$(strip $(1)) = $($(strip $(1)))'!), \
    ), \
)
endef

else    # ifeq (,$(filter $(OMIT_GOALS),$(MAKECMDGOALS)))

define Conflict_Relation
endef

define Present1_Relation
endef

define Requires_Relation
endef

endif   # ifeq (,$(filter $(OMIT_GOALS),$(MAKECMDGOALS)))