Use Automake recipes from Guile.

* build-aux/guile-rules.am: Delete file.
* build-aux/guile.am: New file.
* .gitignore: Do not ignore it.
* Makefile.am: Adapt variable names to the new file.

.gitignore

@@ -9,7 +9,7 @@
 !/build-aux/git-version-gen
 !/build-aux/gitlab-ci.yml
 !/build-aux/gitlog-to-changelog
-!/build-aux/guile-rules.am
+!/build-aux/guile.am
 !/build-aux/pre-inst-env.in
 /config.log
 /config.status

Makefile.am

@@ -1,4 +1,4 @@
-include $(top_srcdir)/build-aux/guile-rules.am
+include $(top_srcdir)/build-aux/guile.am
 
 EXTRA_DIST +=                                   \
   .dir-locals.el                                \
@@ -11,7 +11,7 @@ EXTRA_DIST +=                                   \
 # Modules and scripts
 #####################
 
-GUILE_MODULES =                                 \
+SOURCES =                                       \
   gash/built-ins/break.scm                      \
   gash/built-ins/cd.scm                         \
   gash/built-ins/colon.scm                      \
@@ -57,8 +57,8 @@ bin_SCRIPTS =                                   \
 
 do_subst = sed                                  \
   -e 's,[@]GUILE[@],$(GUILE),g'                 \
-  -e 's,[@]MODDIR[@],$(guilemoduledir),g'       \
-  -e 's,[@]GODIR[@],$(guileobjectdir),g'
+  -e 's,[@]MODDIR[@],$(moddir),g'               \
+  -e 's,[@]GODIR[@],$(ccachedir),g'
 
 scripts/gash: scripts/gash.in Makefile
 	mkdir -p scripts

build-aux/guile-rules.am

@@ -1,26 +0,0 @@
-guilemoduledir=$(datadir)/guile/site/$(GUILE_EFFECTIVE_VERSION)
-guileobjectdir=$(libdir)/guile/$(GUILE_EFFECTIVE_VERSION)/site-ccache
-
-GUILE_OBJECTS = $(GUILE_MODULES:%.scm=%.go)
-
-nobase_guilemodule_DATA = $(GUILE_MODULES)
-nobase_guileobject_DATA = $(GUILE_OBJECTS)
-
-# Make sure source files are installed first, so that the mtime of
-# installed compiled files is greater than that of installed source
-# files.  See
-# <http://lists.gnu.org/archive/html/guile-devel/2010-07/msg00125.html>
-# for details.
-guile_install_go_files = install-nobase_nodist_guileobjectDATA
-$(guile_install_go_files): install-nobase_dist_guilemoduleDATA
-
-GUILE_WARNINGS = -Wunbound-variable -Warity-mismatch -Wformat
-SUFFIXES = .scm .go
-.scm.go:
-	$(AM_V_GEN) GUILE_AUTO_COMPILE=0 \
-	    $(top_builddir)/pre-inst-env \
-	    $(GUILD) compile $(GUILE_WARNINGS) -o "$@" "$<"
-
-EXTRA_DIST = $(GUILE_MODULES)
-
-CLEANFILES = $(GUILE_OBJECTS)

build-aux/guile.am

@@ -0,0 +1,60 @@
+# Gash --- Guile As SHell
+# Copyright © 2019 Timothy Sample <samplet@ngyro.com>
+#
+# This file was adapted from the 'am/guilec' file shipped with GNU
+# Guile version 2.2.4.  Unfortunately that file does not contain a
+# copyright notice.  Looking at Guile's Git commit history, it looks
+# like the notice should read:
+#
+# Copyright 2008-2012, 2016 Free Software Foundation, Inc.
+#
+# This file is part of Gash.
+#
+# Gash is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or (at
+# your option) any later version.
+#
+# Gash 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Gash.  If not, see <http://www.gnu.org/licenses/>.
+
+GOBJECTS = $(SOURCES:%.scm=%.go)
+
+GUILE_WARNINGS =                                                \
+  -Wunbound-variable                                            \
+  -Wmacro-use-before-definition                                 \
+  -Warity-mismatch                                              \
+  -Wformat
+
+moddir = $(datadir)/guile/$(GUILE_EFFECTIVE_VERSION)/$(modpath)
+nobase_mod_DATA = $(SOURCES) $(NOCOMP_SOURCES)
+ccachedir = $(libdir)/guile/$(GUILE_EFFECTIVE_VERSION)/ccache/$(modpath)
+nobase_ccache_DATA = $(GOBJECTS)
+EXTRA_DIST = $(SOURCES) $(NOCOMP_SOURCES)
+
+CLEANFILES = $(GOBJECTS)
+
+# Make sure source files are installed first, so that the mtime of
+# installed compiled files is greater than that of installed source
+# files.  See
+# <http://lists.gnu.org/archive/html/guile-devel/2010-07/msg00125.html>
+# for details.
+guile_install_go_files = install-nobase_ccacheDATA
+$(guile_install_go_files): install-nobase_modDATA
+
+AM_V_GUILEC = $(AM_V_GUILEC_@AM_V@)
+AM_V_GUILEC_ = $(AM_V_GUILEC_@AM_DEFAULT_V@)
+AM_V_GUILEC_0 = @echo "  GUILEC" $@;
+
+SUFFIXES = .scm .go
+
+.scm.go:
+	$(AM_V_GUILEC)GUILE_AUTO_COMPILE=0      \
+	$(top_builddir)/pre-inst-env            \
+	$(GUILD) compile $(GUILE_WARNINGS)      \
+	         -o "$@" "$<"