include/depends.mk

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 #
   3 # Copyright (C) 2007-2020 OpenWrt.org
   4
   5 # define a dependency on a subtree
   6 # parameters:
   7 #       1: directories/files
   8 #       2: directory dependency
   9 #       3: tempfile for file listings
  10 #       4: find options
  11
  12 DEP_FINDPARAMS := -x "*/.svn*" -x ".*" -x "*:*" -x "*\!*" -x "* *" -x "*\\\#*" -x "*/.*_check" -x "*/.*.swp" -x "*/.pkgdir*"
  13
  14 find_md5=find $(wildcard $(1)) -type f $(patsubst -x,-and -not -path,$(DEP_FINDPARAMS) $(2)) -printf "%p%T@\n" | sort | mkhash md5
  15
  16 define rdep
  17   .PRECIOUS: $(2)
  18   .SILENT: $(2)_check
  19
  20   $(2): $(2)_check
  21   check-depends: $(2)_check
  22
  23 ifneq ($(wildcard $(2)),)
  24   $(2)_check::
  25         $(if $(3), \
  26                 $(call find_md5,$(1),$(4)) > $(3).1; \
  27                 { [ \! -f "$(3)" ] || diff $(3) $(3).1 >/dev/null; } && \
  28         ) \
  29         { \
  30                 [ -f "$(2)_check.1" ] && mv "$(2)_check.1"; \
  31             $(TOPDIR)/scripts/timestamp.pl $(DEP_FINDPARAMS) $(4) -n $(2) $(1) && { \
  32                         $(call debug_eval,$(SUBDIR),r,echo "No need to rebuild $(2)";) \
  33                         touch -r "$(2)" "$(2)_check"; \
  34                 } \
  35         } || { \
  36                 $(call debug_eval,$(SUBDIR),r,echo "Need to rebuild $(2)";) \
  37                 touch "$(2)_check"; \
  38         }
  39         $(if $(3), mv $(3).1 $(3))
  40 else
  41   $(2)_check::
  42         $(if $(3), rm -f $(3) $(3).1)
  43         $(call debug_eval,$(SUBDIR),r,echo "Target $(2) not built")
  44 endif
  45
  46 endef
  47
  48 ifeq ($(filter .%,$(MAKECMDGOALS)),$(if $(MAKECMDGOALS),$(MAKECMDGOALS),x))
  49   define rdep
  50     $(2): $(2)_check
  51   endef
  52 endif