include/prereq.mk

   1 #
   2 # Copyright (C) 2006 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 prereq:
   9         if [ -f $(TMP_DIR)/.prereq-error ]; then \
  10                 echo; \
  11                 cat $(TMP_DIR)/.prereq-error; \
  12                 rm -f $(TMP_DIR)/.prereq-error; \
  13                 echo; \
  14                 false; \
  15         fi
  16
  17 .SILENT: prereq
  18
  19 define Require
  20   export PREREQ_CHECK=1
  21   ifeq ($$(CHECK_$(1)),)
  22     prereq: prereq-$(1)
  23
  24     prereq-$(1): FORCE
  25                 echo -n "Checking '$(1)'... "
  26                 if $(NO_TRACE_MAKE) -f $(firstword $(MAKEFILE_LIST)) check-$(1) >/dev/null 2>/dev/null; then \
  27                         echo 'ok.'; \
  28                 else \
  29                         echo 'failed.'; \
  30                         echo -e "$(strip $(2))" | perl -ne 's/\\\s*/\n/g,print' >> $(TMP_DIR)/.prereq-error; \
  31                 fi
  32
  33     check-$(1): FORCE
  34           $(call Require/$(1))
  35     CHECK_$(1):=1
  36
  37     .SILENT: prereq-$(1) check-$(1)
  38   endif
  39 endef
  40
  41
  42 define RequireCommand
  43   define Require/$(1)
  44     which $(1)
  45   endef
  46
  47   $$(eval $$(call Require,$(1),$(2)))
  48 endef
  49