1*9ac870c9SJerome Forissier# Cleaning directories generated during a previous build, 2*9ac870c9SJerome Forissier# a failed previous build or even no previous build. 3*9ac870c9SJerome Forissier# Track build directories through 'cleanfiles'. 4*9ac870c9SJerome Forissier 5*9ac870c9SJerome Forissierdefine _enum-parent-dirs 6*9ac870c9SJerome Forissier$(if $(1),$(1) $(if $(filter / ./,$(dir $(1))),,$(call enum-parent-dirs,$(dir $(1)))),) 7*9ac870c9SJerome Forissierendef 8*9ac870c9SJerome Forissier 9*9ac870c9SJerome Forissierdefine enum-parent-dirs 10*9ac870c9SJerome Forissier$(call _enum-parent-dirs,$(patsubst %/,%,$(1))) 11*9ac870c9SJerome Forissierendef 12*9ac870c9SJerome Forissier 13*9ac870c9SJerome Forissierdefine _reverse 14*9ac870c9SJerome Forissier$(if $(1),$(call _reverse,$(wordlist 2,$(words $(1)),$(1)))) $(firstword $(1)) 15*9ac870c9SJerome Forissierendef 16*9ac870c9SJerome Forissier 17*9ac870c9SJerome Forissier# Returns the list of all existing output directories up to $(O) including all 18*9ac870c9SJerome Forissier# intermediate levels, in depth first order so that rmdir can process them in 19*9ac870c9SJerome Forissier# order. May return an empty string. 20*9ac870c9SJerome Forissier# Example: if cleanfiles is "foo/a/file1 foo/b/c/d/file2" and O=foo, this will 21*9ac870c9SJerome Forissier# return "foo/b/c/d foo/b/c foo/b foo/a" (assuming all exist). 22*9ac870c9SJerome Forissierdefine cleandirs-for-rmdir 23*9ac870c9SJerome Forissier$(wildcard $(addprefix $(O)/,$(call _reverse,$(sort 24*9ac870c9SJerome Forissier $(foreach d,$(patsubst $(O)/%,%,$(dir $(cleanfiles))), 25*9ac870c9SJerome Forissier $(call enum-parent-dirs,$(d))))))) 26*9ac870c9SJerome Forissierendef 27