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  • # SPDX-License-Identifier: GPL-2.0-only
    
    # Copyright (C) 2006-2020 OpenWrt.org
    
    ifneq ($(__prereq_inc),1)
    __prereq_inc:=1
    
    
    prereq:
    
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    	if [ -f $(TMP_DIR)/.prereq-error ]; then \
    
    		cat $(TMP_DIR)/.prereq-error; \
    
    		echo; \
    		false; \
    	fi
    
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    PREREQ_PREV=
    
    # 1: display name
    # 2: error message
    
    define Require
    
      ifeq ($$(CHECK_$(1)),)
        prereq: prereq-$(1)
    
    
        prereq-$(1): $(if $(PREREQ_PREV),prereq-$(PREREQ_PREV)) FORCE
    
    		printf "Checking '$(1)'... "
    
    		if $(NO_TRACE_MAKE) -f $(firstword $(MAKEFILE_LIST)) check-$(1) PATH="$(ORIG_PATH)" >/dev/null 2>/dev/null; then \
    
    			echo 'ok.'; \
    
    		elif $(NO_TRACE_MAKE) -f $(firstword $(MAKEFILE_LIST)) check-$(1) PATH="$(ORIG_PATH)" >/dev/null 2>/dev/null; then \
    
    		else \
    			echo 'failed.'; \
    
    			echo "$(PKG_NAME): $(strip $(2))" >> $(TMP_DIR)/.prereq-error; \
    
    		fi
    
        check-$(1): FORCE
    	  $(call Require/$(1))
        CHECK_$(1):=1
    
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        .SILENT: prereq-$(1) check-$(1)
    
    endef
    
    
    define RequireCommand
      define Require/$(1)
    
        command -v $(1)
    
      endef
    
      $$(eval $$(call Require,$(1),$(2)))
    endef
    
    
    define RequireHeader
      define Require/$(1)
        [ -e "$(1)" ]
      endef
    
      $$(eval $$(call Require,$(1),$(2)))
    endef
    
    
    # 1: header to test
    # 2: failure message
    # 3: optional compile time test
    # 4: optional link library test (example -lncurses)
    define RequireCHeader
      define Require/$(1)
        echo 'int main(int argc, char **argv) { $(3); return 0; }' | gcc -include $(1) -x c -o $(TMP_DIR)/a.out - $(4)
      endef
    
      $$(eval $$(call Require,$(1),$(2)))
    endef
    
    
    define QuoteHostCommand
    '$(subst ','"'"',$(strip $(1)))'
    endef
    
    # 1: display name
    # 2: failure message
    # 3: test
    define TestHostCommand
      define Require/$(1)
    	($(3)) >/dev/null 2>/dev/null
      endef
    
      $$(eval $$(call Require,$(1),$(2)))
    endef
    
    # 1: canonical name
    # 2: failure message
    # 3+: candidates
    define SetupHostCommand
      define Require/$(1)
    
    	mkdir -p "$(STAGING_DIR_HOST)/bin"; \
    
    	for cmd in $(call QuoteHostCommand,$(3)) $(call QuoteHostCommand,$(4)) \
    	           $(call QuoteHostCommand,$(5)) $(call QuoteHostCommand,$(6)) \
    
    	           $(call QuoteHostCommand,$(7)) $(call QuoteHostCommand,$(8)) \
    
    	           $(call QuoteHostCommand,$(9)) $(call QuoteHostCommand,$(10)) \
    	           $(call QuoteHostCommand,$(11)) $(call QuoteHostCommand,$(12)); do \
    
    		if [ -n "$$$$$$$$cmd" ]; then \
    
    			bin="$$$$$$$$(command -v "$$$$$$$${cmd%% *}")"; \
    
    			if [ -x "$$$$$$$$bin" ] && eval "$$$$$$$$cmd" >/dev/null 2>/dev/null; then \
    
    				case "$$$$$$$$(ls -dl -- $(STAGING_DIR_HOST)/bin/$(strip $(1)))" in \
    
    					"-"* | \
    					*" -> $$$$$$$$bin"* | \
    					*" -> "[!/]*) \
    
    						[ -x "$(STAGING_DIR_HOST)/bin/$(strip $(1))" ] && exit 0 \
    						;; \
    
    				ln -sf "$$$$$$$$bin" "$(STAGING_DIR_HOST)/bin/$(strip $(1))"; \
    
    			fi; \
    		fi; \
    	done; \
    	exit 1
      endef
    
      $$(eval $$(call Require,$(1),$(if $(2),$(2),Missing $(1) command)))
    endef