include/prereq.mk

   1 #
   2 # Copyright (C) 2006-2015 OpenWrt.org
   3 #
   4 # This is free software, licensed under the GNU General Public License v2.
   5 # See /LICENSE for more information.
   6 #
   7
   8 ifneq ($(__prereq_inc),1)
   9 __prereq_inc:=1
  10
  11 prereq:
  12         if [ -f $(TMP_DIR)/.prereq-error ]; then \
  13                 echo; \
  14                 cat $(TMP_DIR)/.prereq-error; \
  15                 rm -f $(TMP_DIR)/.prereq-error; \
  16                 echo; \
  17                 false; \
  18         fi
  19
  20 .SILENT: prereq
  21 endif
  22
  23 PREREQ_PREV=
  24
  25 # 1: display name
  26 # 2: error message
  27 define Require
  28   export PREREQ_CHECK=1
  29   ifeq ($$(CHECK_$(1)),)
  30     prereq: prereq-$(1)
  31
  32     prereq-$(1): $(if $(PREREQ_PREV),prereq-$(PREREQ_PREV)) FORCE
  33                 printf "Checking '$(1)'... "
  34                 if $(NO_TRACE_MAKE) -f $(firstword $(MAKEFILE_LIST)) check-$(1) >/dev/null 2>/dev/null; then \
  35                         echo 'ok.'; \
  36                 else \
  37                         echo 'failed.'; \
  38                         echo "$(PKG_NAME): $(strip $(2))" >> $(TMP_DIR)/.prereq-error; \
  39                 fi
  40
  41     check-$(1): FORCE
  42           $(call Require/$(1))
  43     CHECK_$(1):=1
  44
  45     .SILENT: prereq-$(1) check-$(1)
  46     .NOTPARALLEL:
  47   endif
  48
  49   PREREQ_PREV=$(1)
  50 endef
  51
  52
  53 define RequireCommand
  54   define Require/$(1)
  55     which $(1)
  56   endef
  57
  58   $$(eval $$(call Require,$(1),$(2)))
  59 endef
  60
  61 define RequireHeader
  62   define Require/$(1)
  63     [ -e "$(1)" ]
  64   endef
  65
  66   $$(eval $$(call Require,$(1),$(2)))
  67 endef
  68
  69 define QuoteHostCommand
  70 '$(subst ','"'"',$(strip $(1)))'
  71 endef
  72
  73 # 1: display name
  74 # 2: failure message
  75 # 3: test
  76 define TestHostCommand
  77   define Require/$(1)
  78         ($(3)) >/dev/null 2>/dev/null
  79   endef
  80
  81   $$(eval $$(call Require,$(1),$(2)))
  82 endef
  83
  84 # 1: canonical name
  85 # 2: failure message
  86 # 3+: candidates
  87 define SetupHostCommand
  88   define Require/$(1)
  89         for cmd in $(call QuoteHostCommand,$(3)) $(call QuoteHostCommand,$(4)) \
  90                    $(call QuoteHostCommand,$(5)) $(call QuoteHostCommand,$(6)) \
  91                    $(call QuoteHostCommand,$(7)) $(call QuoteHostCommand,$(8)) \
  92                            $(call QuoteHostCommand,$(9)); do \
  93                 if [ -n "$$$$$$$$cmd" ]; then \
  94                         bin="$$$$$$$$(PATH="$(subst $(space),:,$(filter-out $(STAGING_DIR_HOST)/%,$(subst :,$(space),$(PATH))))" \
  95                                 which "$$$$$$$${cmd%% *}")"; \
  96                         if [ -x "$$$$$$$$bin" ] && eval "$$$$$$$$cmd" >/dev/null 2>/dev/null; then \
  97                                 mkdir -p "$(STAGING_DIR_HOST)/bin"; \
  98                                 ln -sf "$$$$$$$$bin" "$(STAGING_DIR_HOST)/bin/$(strip $(1))"; \
  99                                 exit 0; \
 100                         fi; \
 101                 fi; \
 102         done; \
 103         exit 1
 104   endef
 105
 106   $$(eval $$(call Require,$(1),$(if $(2),$(2),Missing $(1) command)))
 107 endef