(libretools) Fix bugs in autothing.

Some of these are that I hadn't originally designed autothing v3 to work
with --warn-undefined-variables.

Others are just straight-up bugs from inadequate testing.

12 files changed, 67 insertions, 53 deletions

diff --git a/build-aux/Makefile.each.tail/00-var.mk b/build-aux/Makefile.each.tail/00-var.mk
index c2fd9d7..954defb 100644
--- a/build-aux/Makefile.each.tail/00-var.mk
+++ b/build-aux/Makefile.each.tail/00-var.mk
@@ -1,4 +1,4 @@
-# Copyright (C) 2016  Luke Shumaker
+# Copyright (C) 2016-2017  Luke Shumaker
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as published by
@@ -13,10 +13,10 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-mod.var.depends += quote write-ifchanged
+mod.var.depends += files quote write-ifchanged
 
 $(outdir)/.var.%: _var.FORCE
 	@printf '%s' $(call quote.shell,$($*)) | sed 's/^/#/' | $(WRITE_IFCHANGED) $@
 -include $(wildcard $(outdir)/.var.*)
 
-at.targets += $(addprefix $(outdir)/,.var.%)
+files.out.int += .var.*
diff --git a/build-aux/Makefile.each.tail/10-files.mk b/build-aux/Makefile.each.tail/10-files.mk
index 3bb3bc2..787a3bd 100644
--- a/build-aux/Makefile.each.tail/10-files.mk
+++ b/build-aux/Makefile.each.tail/10-files.mk
@@ -1,4 +1,4 @@
-# Copyright (C) 2015-2016  Luke Shumaker
+# Copyright (C) 2015-2017  Luke Shumaker
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as published by
@@ -41,17 +41,12 @@ _files.uninstall   = $(_files.sys)
 _files.mostlyclean = $(filter-out $(_files.out.slow) $(_files.out.cfg),$(_files.out))
 _files.clean       = $(filter-out                    $(_files.out.cfg),$(_files.out))
 _files.distclean   =                                                   $(_files.out)
-$(addprefix $(outdir)/,uninstall mostlyclean clean distclean): %: %-hook
-	$(RM)    -- $(sort $(filter-out %/,$(_files.$(@F))))
-	$(RM) -r -- $(sort $(filter     %/,$(_files.$(@F))))
-	$(RMDIR_P) -- $(sort $(dir $(_files.$(@F))))
-_files.maintainer-clean   = $(filter-out $(_files.src.cfg) $(_files.src.src),$(_files.src))
-_files.$(files.vcsclean)  = $(filter-out                   $(_files.src.src),$(_files.src))
-$(addprefix $(outdir)/,maintainer-clean $(files.vcsclean)): $(outdir)/%: $(outdir)/distclean $(outdir)/%-hook
-	@echo 'This command is intended for maintainers to use; it'
-	@echo 'deletes files that may need special tools to rebuild.'
-	$(RM)    -- $(sort $(filter-out %/,$(_files.$(@F))))
-	$(RM) -r -- $(sort $(filter     %/,$(_files.$(@F))))
-	$(RMDIR_P) -- $(sort $(dir $(_files.$(@F))))
+_files.maintainer-clean  = $(_files.distclean) $(filter-out $(_files.src.cfg) $(_files.src.src),$(_files.src))
+_files.$(files.vcsclean) = $(_files.distclean) $(filter-out                   $(_files.src.src),$(_files.src))
+$(addprefix $(outdir)/,uninstall mostlyclean clean distclean maintainer-clean $(files.vcsclean)): %: %-hook
+	$(call _files.XARGS,$(RM)    --,                  $(sort $(wildcard $(filter-out %/,$(_files.$(@F))))) )
+	$(call _files.XARGS,$(RM) -r --,                  $(sort $(wildcard $(filter     %/,$(_files.$(@F))))) )
+	$(call _files.XARGS,$(RMDIR_P) --,$(filter-out ./,$(sort $(wildcard $(dir           $(_files.$(@F)))))))
+$(addprefix $(outdir)/,maintainer-clean $(files.vcsclean)): _files.maintainer-clean-warning
 $(foreach t,uninstall mostlyclean clean distclean maintainer-clean $(files.vcsclean), $(outdir)/$t-hook)::
 .PHONY: $(foreach t,uninstall mostlyclean clean distclean maintainer-clean $(files.vcsclean), $(outdir)/$t-hook)
diff --git a/build-aux/Makefile.each.tail/10-nested.mk b/build-aux/Makefile.each.tail/10-nested.mk
index 5e5a40b..667ec6f 100644
--- a/build-aux/Makefile.each.tail/10-nested.mk
+++ b/build-aux/Makefile.each.tail/10-nested.mk
@@ -1,4 +1,4 @@
-# Copyright (C) 2016  Luke Shumaker
+# Copyright (C) 2016-2017  Luke Shumaker
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as published by
@@ -18,3 +18,4 @@ $(eval $(foreach _tmp.nested,$(nested.targets),\
 .PHONY: $(addprefix $(outdir)/,$(nested.targets))
 
 at.subdirs += $(nested.subdirs)
+at.targets += $(addprefix $(outdir)/,$(nested.targets))
diff --git a/build-aux/Makefile.each.tail/11-texinfo.mk b/build-aux/Makefile.each.tail/11-texinfo.mk
index 9491820..1ee5843 100644
--- a/build-aux/Makefile.each.tail/11-texinfo.mk
+++ b/build-aux/Makefile.each.tail/11-texinfo.mk
@@ -26,10 +26,6 @@ files.sys.html += $(foreach f,$(texinfo.docs), $(htmldir)/$f.html )
 files.sys.pdf  += $(foreach f,$(texinfo.docs), $(pdfdir)/$f.pdf   )
 files.sys.ps   += $(foreach f,$(texinfo.docs), $(psdir)/$f.ps     )
 
-$(outdir)/install:
-	$(POST_INSTALL)
-	$(foreach f,$(texinfo.docs),$(INSTALL_INFO) $(DESTDIR)$(infodir)/$f.info $(DESTDIR)$(infodir)/dir$(at.nl))
-
 $(outdir)/%.info: $(srcdir)/%.texi; $(MAKEINFO)  -o $(@D) $<
 $(outdir)/%.info: $(outdir)/%.texi; $(MAKEINFO)  -o $(@D) $<
 $(outdir)/%.dvi : $(srcdir)/%.texi; $(TEXI2DVI)  -o $(@D) $<
diff --git a/build-aux/Makefile.head.mk b/build-aux/Makefile.head.mk
index f4eb51d..6ac3d49 100644
--- a/build-aux/Makefile.head.mk
+++ b/build-aux/Makefile.head.mk
@@ -32,17 +32,19 @@ _at.relbase = $(strip                                                   \
 _at.relto = $(strip                                                     \
   $(if $(call _at.is_subdir,$1,$2),                                     \
        $(patsubst %/.,%,$(patsubst $(abspath $1)/%,%,$(abspath $2)/.)), \
-       ../$(call _at.relto,$(dir $1),$2)))
+       ../$(call _at.relto,$(dir $(abspath $1)),$2)))
 
 # These 3 functions only take one operand; we define public multi-operand
 # versions below.
-_at.path = $(strip                                                            \
-  $(if $(call _at.is_subdir,$(topoutdir),$1),                                 \
-       $(patsubst %/.,%,$(topoutdir)/$(call _at.relto,.,$1)),                 \
-       $(if $(call _at.is_subdir,$(topsrcdir),$1),                            \
-            $(patsubst %/.,%,$(topsrcdir)/$(call _at.relto,$(topsrcdir),$1)), \
-            $(abspath $1))))
-_at.out2src = $(call _at.path,$(if $(call _at.is_subdir,$(topoutdir),$1),$(topsrcdir)/$(call _at.path,$1),$1))
+_at.path = $(strip $(or                                                                                         \
+  $(if $(call _at.is_subdir,      .     ,$1),                              $(call _at.relto,      .     ,$1) ), \
+  $(if $(call _at.is_subdir,$(topoutdir),$1),$(patsubst %/.,%,$(topoutdir)/$(call _at.relto,$(topoutdir),$1))), \
+  $(if $(call _at.is_subdir,$(topsrcdir),$1),$(patsubst %/.,%,$(topsrcdir)/$(call _at.relto,$(topsrcdir),$1))), \
+  $(abspath $1)))
+_at.out2src = $(call _at.path,$(strip                  \
+  $(if $(call _at.is_subdir,$(topoutdir),$1),          \
+       $(topsrcdir)/$(call _at.relto,$(topoutdir),$1), \
+       $1)))
 _at.addprefix = $(call _at.path,$(if $(filter-out /%,$2),$1/$2,$2))
 
 _at.rest = $(wordlist 2,$(words $1),$1)
@@ -103,9 +105,7 @@ ifeq ($(call _at.is_subdir,$(topoutdir),$(outdir)),)
 $(error Autothing: not a subdirectory of topoutdir=$(topoutdir): $(outdir))
 endif
 
-# Don't use at.out2src because we *know* that $(outdir) is inside $(topoutdir),
-# and has already had $(_at.path) called on it.
-srcdir := $(call _at.path,$(topsrcdir)/$(outdir))
+srcdir := $(call _at.out2src,$(outdir))
 ifeq ($(call _at.is_subdir,$(topsrcdir),$(srcdir)),)
 $(error Autothing: not a subdirectory of topsrcdir=$(topsrcdir): $(srcdir))
 endif
diff --git a/build-aux/Makefile.once.head/00-var.mk b/build-aux/Makefile.once.head/00-var.mk
index 1f50f21..7c9e6ff 100644
--- a/build-aux/Makefile.once.head/00-var.mk
+++ b/build-aux/Makefile.once.head/00-var.mk
@@ -1,4 +1,4 @@
-# Copyright (C) 2016  Luke Shumaker
+# Copyright (C) 2016-2017  Luke Shumaker
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as published by
@@ -20,14 +20,17 @@ define mod.var.doc
 # Outputs:
 #   Target            : `$(outdir)/.var.%`
 #   Directory variable: `at.targets`
+#   Directory variable: `var.`
 #
 # It's a well-known secret that many files generated by a Makefile vary with
 # the values of particular variables, but that GNU Make can't track these
 # dependencies.  Well, with some cleverness, it actually can!
 #
 # With this module, to depend on the value of a variable, depend on
-# `$(outdir)/.var.VARNAME`.
+# `$(outdir)/.var.VARNAME`, or `$(var.)VARNAME` for short.
 endef
 mod.var.doc := $(value mod.var.doc)
 
+var. = $(patsubst ./%,%,$(outdir)/.var.)
+
 .PHONY: _var.FORCE
diff --git a/build-aux/Makefile.once.head/10-dist.mk b/build-aux/Makefile.once.head/10-dist.mk
index 27b39ec..3621195 100644
--- a/build-aux/Makefile.once.head/10-dist.mk
+++ b/build-aux/Makefile.once.head/10-dist.mk
@@ -1,4 +1,4 @@
-# Copyright (C) 2015-2016  Luke Shumaker
+# Copyright (C) 2015-2017  Luke Shumaker
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as published by
@@ -50,6 +50,12 @@ define mod.dist.doc
 endef
 mod.dist.doc := $(value mod.dist.doc)
 
+PACKAGE_TARNAME ?=
+PACKAGE ?=
+PACKAGE_NAME ?=
+PACKAGE_VERSION ?=
+VERSION ?=
+
 # Developer configuration
 
 dist.exts ?= .tar.gz
diff --git a/build-aux/Makefile.once.head/10-files.mk b/build-aux/Makefile.once.head/10-files.mk
index f6fcf30..564f9d6 100644
--- a/build-aux/Makefile.once.head/10-files.mk
+++ b/build-aux/Makefile.once.head/10-files.mk
@@ -1,4 +1,4 @@
-# Copyright (C) 2015-2016  Luke Shumaker
+# Copyright (C) 2015-2017  Luke Shumaker
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as published by
@@ -26,15 +26,15 @@ define mod.files.doc
 #   - Global variable    : `files.default  ?= all`
 #   - Global variable    : `files.vcsclean ?= files.vcsclean`
 #   - Global variable    : `files.generate ?= files.generate`
-#   - Directory variable : `files.src.src`
-#   - Directory variable : `files.src.int`
-#   - Directory variable : `files.src.cfg`
-#   - Directory variable : `files.src.gen`
-#   - Directory variable : `files.out.slow`
-#   - Directory variable : `files.out.int`
-#   - Directory variable : `files.out.cfg`
-#   - Directory variable : `files.out.$(files.groups)` (well, $(addprefix...))
-#   - Directory variable : `files.sys.$(files.groups)` (well, $(addprefix...))
+#   - Directory variable : `files.src.src`  # Sources
+#   - Directory variable : `files.src.int`  # Intermediates; deletable
+#   - Directory variable : `files.src.cfg`  # Outputs needed to run ./configure
+#   - Directory variable : `files.src.gen`  # Other outputs
+#   - Directory variable : `files.out.slow` # Things to exclude from `make mostlyclean`
+#   - Directory variable : `files.out.int`  # Intermediates
+#   - Directory variable : `files.out.cfg`  # Outputs created by ./configure
+#   - Directory variable : `files.out.$(group)` for `group` in `$(files.groups)`
+#   - Directory variable : `files.sys.$(group)` for `group` in `$(files.groups)`
 # Outputs:
 #   - Global variable    : `nested.targets`
 #   - Global variable    : `at.targets`
@@ -43,7 +43,7 @@ define mod.files.doc
 #   - Directory variable : `files.out`
 #   - Directory variable : `files.sys`
 #   - Creative .PHONY targets:
-#     - `$(outdir)/$(files.generate))`
+#     - `$(outdir)/$(files.generate)`
 #     - `$(outdir)/$(group)` for `group` in `$(files.groups)`
 #     - `$(outdir)/install`
 #     - `$(outdir)/install-$(group)` for `group` in `$(filter-out $(files.default),$(files.groups))`
@@ -59,6 +59,10 @@ define mod.files.doc
 # Basic `*` wildcards are supported.  Use `*`, not `%`; it will automatically
 # substitute `*`->`%` where appropriate.
 #
+# Each of the destructive targets depends on `$(target)-hook`, which
+# is defined to be a "double-colon rule" allowing you to add your own
+# code.
+#
 # TODO: prose documentation
 endef
 mod.files.doc := $(value mod.files.doc)
@@ -76,7 +80,7 @@ nested.targets += install installdirs
 nested.targets += $(foreach g,$(files.groups),$g)
 nested.targets += $(foreach g,$(filter-out $(files.default),$(files.groups)),install-$g install-$gdirs)
 # Standard destructive PHONY targets
-nested.targets += uninstall mostlyclean clean distclean maintainer-clean
+nested.targets += uninstall mostlyclean clean distclean maintainer-clean $(files.vcsclean)
 
 # User configuration
 
@@ -85,3 +89,12 @@ DESTDIR ?=
 RM      ?= rm -f
 RMDIR_P ?= rmdir -p --ignore-fail-on-non-empty
 TRUE    ?= true
+
+# Utility functions
+
+_files.XARGS = $(if $(strip $2),$1 $(strip $2))
+
+_files.maintainer-clean-warning:
+	@echo 'This command is intended for maintainers to use; it'
+	@echo 'deletes files that may need special tools to rebuild.'
+.PHONY: _files.maintainer-clean-warning
diff --git a/build-aux/Makefile.once.head/00-gitfiles.mk b/build-aux/Makefile.once.head/10-gitfiles.mk
index 8566a7f..8566a7f 100644
--- a/build-aux/Makefile.once.head/00-gitfiles.mk
+++ b/build-aux/Makefile.once.head/10-gitfiles.mk
diff --git a/build-aux/Makefile.once.head/10-gnuconf.mk b/build-aux/Makefile.once.head/10-gnuconf.mk
index e24dfa1..87baa14 100644
--- a/build-aux/Makefile.once.head/10-gnuconf.mk
+++ b/build-aux/Makefile.once.head/10-gnuconf.mk
@@ -30,6 +30,9 @@ define mod.gnuconf.doc
 endef
 mod.gnuconf.doc := $(value mod.gnuconf.doc)
 
+PACKAGE_TARNAME ?=
+PACKAGE ?=
+PACKAGE_NAME ?=
 gnuconf.pkgname ?= $(firstword $(PACKAGE_TARNAME) $(PACKAGE) $(PACKAGE_NAME))
 ifeq ($(gnuconf.pkgname),)
 $(error Autothing module: gnuconf: gnuconf.pkgname must be set)
diff --git a/build-aux/Makefile.once.head/10-nested.mk b/build-aux/Makefile.once.head/10-nested.mk
index 4f181a9..d903d53 100644
--- a/build-aux/Makefile.once.head/10-nested.mk
+++ b/build-aux/Makefile.once.head/10-nested.mk
@@ -1,4 +1,4 @@
-# Copyright (C) 2016  Luke Shumaker
+# Copyright (C) 2016-2017  Luke Shumaker
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as published by
@@ -21,6 +21,7 @@ define mod.nested.doc
 # Outputs:
 #   - .PHONY Targets     : `$(addprefix $(outdir)/,$(nested.targets))`
 #   - Variable           : `at.subdirs`
+#   - Variable           : `at.targets`
 #
 # The Autothing `at.subdirs` slates a subdirectory's Makefile for inclusion,
 # but doesn't help with recursive targets like `all`, `install`, or `clean`,
diff --git a/build-aux/Makefile.once.head/10-texinfo.mk b/build-aux/Makefile.once.head/10-texinfo.mk
index aac2c28..d24852d 100644
--- a/build-aux/Makefile.once.head/10-texinfo.mk
+++ b/build-aux/Makefile.once.head/10-texinfo.mk
@@ -29,17 +29,13 @@ define mod.texinfo.doc
 #   - Directory variable : `files.out.{dvi,html,pdf,ps}`
 #   - Directory variable : `files.sys.{dvi,html,pdf,ps,all}`
 #   - .PHONY target      : `$(outdir)/info`
-#   - .PHONY target      : `$(outdir)/install` (see below)
 #   - Target             : `$(outdir)/%.info`
 #   - Target             : `$(outdir)/%.dvi`
 #   - target             : `$(outdir)/%.html`
 #   - target             : `$(outdir)/%.pdf`
 #   - Target             : `$(outdir)/%.ps`
 #
-# The module counts on the `$(outdir)/install` target being defined by
-# `files`, but not having a rule that executes once the dependencies
-# have been taken care of; it adds a "post-install" rule to add the
-# info files to the index.
+# TODO: prose documentation
 endef
 mod.texinfo.doc := $(value mod.texinfo.doc)