Root/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
14DEP_FINDPARAMS := -x "*/.svn*" -x ".*" -x "*:*" -x "*\!*" -x "* *" -x "*\\\#*" -x "*/.*_check" -x "*/.*.swp"
15
16find_md5=$(SH_FUNC) find $(1) -type f $(patsubst -x,-and -not -path,$(DEP_FINDPARAMS) $(2)) | md5s
17
18define rdep
19  .PRECIOUS: $(2)
20  .SILENT: $(2)_check
21
22  $(2): $(2)_check
23
24ifneq ($(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"; \
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))
41else
42  $(2)_check::
43    $(if $(3), rm -f $(3) $(3).1)
44    $(call debug_eval,$(SUBDIR),r,echo "Target $(2) not built")
45endif
46
47endef
48
49

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