autotargets.mk - mozsearch

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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)

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)