OpenWrt – Rev 1

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#
# Copyright (C) 2006-2015 OpenWrt.org
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#

ifneq ($(__prereq_inc),1)
__prereq_inc:=1

prereq:
        if [ -f $(TMP_DIR)/.prereq-error ]; then \
                echo; \
                cat $(TMP_DIR)/.prereq-error; \
                rm -f $(TMP_DIR)/.prereq-error; \
                echo; \
                false; \
        fi

.SILENT: prereq
endif

PREREQ_PREV=

# 1: display name
# 2: error message
define Require
  export PREREQ_CHECK=1
  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) >/dev/null 2>/dev/null; then \
                        echo 'ok.'; \
                else \
                        echo 'failed.'; \
                        echo "$(PKG_NAME): $(strip $(2))" >> $(TMP_DIR)/.prereq-error; \
                fi

    check-$(1): FORCE
          $(call Require/$(1))
    CHECK_$(1):=1

    .SILENT: prereq-$(1) check-$(1)
    .NOTPARALLEL:
  endif

  PREREQ_PREV=$(1)
endef


define RequireCommand
  define Require/$(1)
    which $(1)
  endef

  $$(eval $$(call Require,$(1),$(2)))
endef

define RequireHeader
  define Require/$(1)
    [ -e "$(1)" ]
  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/$(1)
        [ -f "$(STAGING_DIR_HOST)/bin/$(strip $(1))" ] && exit 0; \
        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 "$$$$$$$$cmd" ]; then \
                        bin="$$$$$$$$(PATH="$(subst $(space),:,$(filter-out $(STAGING_DIR_HOST)/%,$(subst :,$(space),$(PATH))))" \
                                which "$$$$$$$${cmd%% *}")"; \
                        if [ -x "$$$$$$$$bin" ] && eval "$$$$$$$$cmd" >/dev/null 2>/dev/null; then \
                                mkdir -p "$(STAGING_DIR_HOST)/bin"; \
                                ln -sf "$$$$$$$$bin" "$(STAGING_DIR_HOST)/bin/$(strip $(1))"; \
                                exit 0; \
                        fi; \
                fi; \
        done; \
        exit 1
  endef

  $$(eval $$(call Require,$(1),$(if $(2),$(2),Missing $(1) command)))
endef