ooops, m4 is already part of the host tools
[oweals/openwrt.git] / 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 "*.svn*" -x "*:*" -x "*\!*" -x "* *" -x "*\\\#*" -x "*/.*_check"
15
16 find_md5=find $(1) -type f $(patsubst -x,-and -not -path,$(DEP_FINDPARAMS) $(2)) | md5s
17
18 define rdep
19   .PRECIOUS: $(2)
20   .SILENT: $(2)_check
21
22   $(2): $(2)_check
23   $(2)_check::
24         if [ -f "$(2)" ]; then \
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                 $(if $(3), rm -f $(3) $(3).1;) \
42                 $(call debug_eval,$(SUBDIR),r,echo "Target $(2) not built";) \
43                 true; \
44         fi
45
46 endef
47