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-rw-r--r--config/makefiles/autotargets.mk94
1 files changed, 94 insertions, 0 deletions
diff --git a/config/makefiles/autotargets.mk b/config/makefiles/autotargets.mk
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+# -*- makefile -*-
+# vim:set ts=8 sw=8 sts=8 noet:
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
+#
+
+ifndef INCLUDED_AUTOTARGETS_MK #{
+
+# Conditional does not wrap the entire file so multiple
+# includes will be able to accumulate dependencies.
+
+###########################################################################
+# AUTO_DEPS - A list of deps/targets drived from other macros.
+###########################################################################
+
+MKDIR ?= mkdir -p
+TOUCH ?= touch
+
+# declare for local use, rules.mk may not have been loaded
+space = $(NULL) $(NULL)
+
+# Deps will be considered intermediate when used as a pre-requisite for
+# wildcard targets. Inhibit their removal, mkdir -p is a standalone op.
+.PRECIOUS: %/.mkdir.done
+
+#########################
+##---] FUNCTIONS [---##
+#########################
+
+# Squeeze can be overzealous, restore root for abspath
+getPathPrefix =$(if $(filter /%,$(1)),/)
+
+# Squeeze '//' from the path, easily created by string functions
+_slashSqueeze =$(foreach val,$(getargv),$(call getPathPrefix,$(val))$(subst $(space),/,$(strip $(subst /,$(space),$(val)))))
+
+# Squeeze extraneous directory slashes from the path
+# o protect embedded spaces within the path
+# o replace //+ sequences with /
+slash_strip = \
+ $(strip \
+ $(subst <--[**]-->,$(space),\
+ $(call _slashSqueeze,\
+ $(subst $(space),<--[**]-->,$(1))\
+ )))
+
+# Extract directory path from a dependency file.
+mkdir_stem =$(foreach val,$(getargv),$(subst /.mkdir.done,$(NULL),$(val)))
+
+## Generate timestamp file for threadsafe directory creation
+mkdir_deps =$(foreach dir,$(getargv),$(call slash_strip,$(dir)/.mkdir.done))
+
+#######################
+##---] TARGETS [---##
+#######################
+
+%/.mkdir.done: # mkdir -p -p => mkdir -p
+ $(subst $(space)-p,$(null),$(MKDIR)) -p '$(dir $@)'
+# Make the timestamp old enough for not being a problem with symbolic links
+# targets depending on it. Use Jan 3, 1980 to accomodate any timezone where
+# 198001010000 would translate to something older than FAT epoch.
+ @$(TOUCH) -t 198001030000 '$@'
+
+# A handful of makefiles are attempting "mkdir dot".
+# tbpl/valgrind builds are using this target
+# https://bugzilla.mozilla.org/show_bug.cgi?id=837754
+.mkdir.done:
+ @echo 'WARNING: $(MKDIR) -dot- requested by $(MAKE) -C $(CURDIR) $(MAKECMDGOALS)'
+ @$(TOUCH) -t 198001030000 '$@'
+
+INCLUDED_AUTOTARGETS_MK = 1
+endif #}
+
+
+## Accumulate deps and cleanup
+ifneq (,$(GENERATED_DIRS))
+ GENERATED_DIRS := $(strip $(sort $(GENERATED_DIRS)))
+ tmpauto :=$(call mkdir_deps,GENERATED_DIRS)
+ GENERATED_DIRS_DEPS +=$(tmpauto)
+ GARBAGE_DIRS +=$(GENERATED_DIRS)
+endif
+
+#################################################################
+# One ring/dep to rule them all:
+# config/rules.mk::all target is available by default
+# Add $(AUTO_DEPS) as an explicit target dependency when needed.
+#################################################################
+
+AUTO_DEPS +=$(GENERATED_DIRS_DEPS)
+AUTO_DEPS := $(strip $(sort $(AUTO_DEPS)))
+
+# Complain loudly if deps have not loaded so getargv != $(NULL)
+$(call requiredfunction,getargv)