include/depends.mk

   1 #
   2 # Copyright (C) 2007 OpenWrt.org
   3 #
   4 # This is free software, licensed under the GNU General Public License v2.
   5 # See /LICENSE for more information.
   6 #
   7 # define a dependency on a subtree
   8 # parameters:
   9 #       1: directories/files
  10 #       2: directory dependency
  11 #       3: tempfile for file listings
  12 #       4: find options
  13
  14 DEP_FINDPARAMS := -x "*/.svn*" -x ".*" -x "*:*" -x "*\!*" -x "* *" -x "*\\\#*" -x "*/.*_check" -x "*/.*.swp" -x "*/.pkgdir*"
  15
  16 find_md5=find $(wildcard $(1)) -type f $(patsubst -x,-and -not -path,$(DEP_FINDPARAMS) $(2)) | mkhash md5
  17
  18 define rdep
  19   .PRECIOUS: $(2)
  20   .SILENT: $(2)_check
  21
  22   $(2): $(2)_check
  23   check-depends: $(2)_check
  24
  25 ifneq ($(wildcard $(2)),)
  26   $(2)_check::
  27         $(if $(3), \
  28                 $(call find_md5,$(1),$(4)) > $(3).1; \
  29                 { [ \! -f "$(3)" ] || diff $(3) $(3).1 >/dev/null; } && \
  30         ) \
  31         { \
  32                 [ -f "$(2)_check.1" ] && mv "$(2)_check.1"; \
  33             $(TOPDIR)/scripts/timestamp.pl $(DEP_FINDPARAMS) $(4) -n $(2) $(1) && { \
  34                         $(call debug_eval,$(SUBDIR),r,echo "No need to rebuild $(2)";) \
  35                         touch -r "$(2)" "$(2)_check"; \
  36                 } \
  37         } || { \
  38                 $(call debug_eval,$(SUBDIR),r,echo "Need to rebuild $(2)";) \
  39                 touch "$(2)_check"; \
  40         }
  41         $(if $(3), mv $(3).1 $(3))
  42 else
  43   $(2)_check::
  44         $(if $(3), rm -f $(3) $(3).1)
  45         $(call debug_eval,$(SUBDIR),r,echo "Target $(2) not built")
  46 endif
  47
  48 endef
  49
  50 ifeq ($(filter .%,$(MAKECMDGOALS)),$(if $(MAKECMDGOALS),$(MAKECMDGOALS),x))
  51   define rdep
  52     $(2): $(2)_check
  53   endef
  54 endif