Refactor the build system. Avoid recursive make.

This looks like a lot, but more things should "just work".

We have `make dist` now!

1 files changed, 58 insertions, 0 deletions

diff --git a/automake.head.mk b/automake.head.mk
new file mode 100644
index 0000000..a3c90fd
--- /dev/null
+++ b/automake.head.mk
@@ -0,0 +1,58 @@
+# Copyright (C) 2015-2016  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
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# 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/>.
+
+_am = am_
+
+_am_noslash = $(patsubst %/.,%,$(patsubst %/,%,$1))
+# These are all $(call _am_func,parent,child)
+#_am_relto = $(if $2,$(shell realpath -s --relative-to='$1' $2))
+_am_is_subdir = $(filter $(abspath $1)/%,$(abspath $2)/.)
+_am_relto_helper = $(if $(call _am_is_subdir,$1,$2),$(patsubst $1/%,%,$(addsuffix /.,$2)),$(addprefix ../,$(call _am_relto_helper,$(patsubst %/,%,$(dir $1)),$2)))
+_am_relto = $(call _am_noslash,$(call _am_relto_helper,$(call _am_noslash,$(abspath $1)),$(call _am_noslash,$(abspath $2))))
+# Note that _am_is_subdir says that a directory is a subdirectory of
+# itself.
+_am_path = $(call _am_relto,.,$1)
+
+## Declare the default target
+all: build
+.PHONY: all
+
+## Set topoutdir, outdir, and srcdir (assumes that topsrcdir is
+## already set, and that $(topoutdir)/config.mk has been included)
+ifeq ($(topoutdir),)
+topoutdir := $(call _am_path,$(dir $(lastword $(filter %/config.mk config.mk,$(MAKEFILE_LIST)))))
+endif
+   outdir := $(call _am_path,$(dir $(lastword $(filter-out %.mk,$(MAKEFILE_LIST)))))
+   srcdir := $(call _am_path,$(topsrcdir)/$(call _am_relto,$(topoutdir),$(outdir)))
+
+_am_included_makefiles := $(_am_included_makefiles) $(call _am_path,$(outdir)/Makefile)
+
+## Empty variables for use by the module
+$(_am)subdirs =
+$(_am)depdirs =
+
+$(_am)src_files =
+$(_am)gen_files =
+$(_am)cfg_files =
+$(_am)out_files =
+$(_am)sys_files =
+
+$(_am)clean_files =
+$(_am)slow_files =
+
+ifeq ($(_am_NO_ONCE),)
+include $(topsrcdir)/common.once.head.mk
+endif
+include $(topsrcdir)/common.each.head.mk