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 find_md5_reproducible=find $(wildcard $(1)) -type f $(patsubst -x,-and -not -path,$(DEP_FINDPARAMS) $(2)) -print0 | xargs -0 $(MKHASH) md5 | sort | $(MKHASH) md5
  16
  17 define rdep
  18   .PRECIOUS: $(2)
  19   .SILENT: $(2)_check
  20
  21   $(2): $(2)_check
  22   check-depends: $(2)_check
  23
  24 ifneq ($(wildcard $(2)),)
  25   $(2)_check::
  26         $(if $(3), \
  27                 $(call find_md5,$(1),$(4)) > $(3).1; \
  28                 { [ \! -f "$(3)" ] || diff $(3) $(3).1 >/dev/null; } && \
  29         ) \
  30         { \
  31                 [ -f "$(2)_check.1" ] && mv "$(2)_check.1" "$(2)_check"; \
  32             $(TOPDIR)/scripts/timestamp.pl $(DEP_FINDPARAMS) $(4) -n $(2) $(1) && { \
  33                         $(call debug_eval,$(SUBDIR),r,echo "No need to rebuild $(2)";) \
  34                         touch -r "$(2)" "$(2)_check"; \
  35                 } \
  36         } || { \
  37                 $(call debug_eval,$(SUBDIR),r,echo "Need to rebuild $(2)";) \
  38                 touch "$(2)_check"; \
  39         }
  40         $(if $(3), mv $(3).1 $(3))
  41 else
  42   $(2)_check::
  43         $(if $(3), rm -f $(3) $(3).1)
  44         $(call debug_eval,$(SUBDIR),r,echo "Target $(2) not built")
  45 endif
  46
  47 endef
  48
  49 ifeq ($(filter .%,$(MAKECMDGOALS)),$(if $(MAKECMDGOALS),$(MAKECMDGOALS),x))
  50   define rdep
  51     $(2): $(2)_check
  52   endef
  53 endif