Factor out and update the usual Guile rules.

* build-aux/guile-rules.am: New file.
* .gitignore: Do not ignore it.
* Makefile.am: Include it, remove the rules it replaces, update
changed variable names, and use appending for 'EXTRA_DIST' and
'CLEANFILES'.

.gitignore

@@ -9,6 +9,7 @@
 !/build-aux/git-version-gen
 !/build-aux/gitlab-ci.yml
 !/build-aux/gitlog-to-changelog
+!/build-aux/guile-rules.am
 !/build-aux/pre-inst-env.in
 /config.log
 /config.status

Makefile.am

@@ -1,24 +1,4 @@
-moddir=$(datadir)/guile/site/$(GUILE_EFFECTIVE_VERSION)
-godir=$(libdir)/guile/$(GUILE_EFFECTIVE_VERSION)/ccache
-
-GOBJECTS = $(MODULES:%.scm=%.go)
-
-nobase_mod_DATA = $(MODULES) $(NOCOMP_SOURCES)
-nobase_go_DATA = $(GOBJECTS)
-
-# Make sure source files are installed first, so that the mtime of
-# installed compiled files is greater than that of installed source
-# files.  See
-# <http://lists.gnu.org/archive/html/guile-devel/2010-07/msg00125.html>
-# for details.
-guile_install_go_files = install-nobase_nodist_guileobjectDATA
-$(guile_install_go_files): install-nobase_dist_guilemoduleDATA
-
-GUILE_WARNINGS = -Wunbound-variable -Warity-mismatch -Wformat
-SUFFIXES = .scm .go
-.scm.go:
-	$(AM_V_GEN)$(top_builddir)/pre-inst-env \
-	    $(GUILE_TOOLS) compile $(GUILE_WARNINGS) -o "$@" "$<"
+include $(top_srcdir)/build-aux/guile-rules.am
 
 TEST_EXTENSIONS = .scm .sh
 SCM_LOG_COMPILER = $(top_builddir)/pre-inst-env $(GUILE)
@@ -60,7 +40,7 @@ gen-ChangeLog:
 	mv $(distdir)/ChangeLog-t $(distdir)/ChangeLog
 
 
-MODULES =                                       \
+GUILE_MODULES =                                 \
   gash/built-ins/break.scm                      \
   gash/built-ins/cd.scm                         \
   gash/built-ins/colon.scm                      \
@@ -104,8 +84,8 @@ bin_SCRIPTS =                                   \
 
 do_subst = sed                                  \
   -e 's,[@]GUILE[@],$(GUILE),g'                 \
-  -e 's,[@]MODDIR[@],$(moddir),g'               \
-  -e 's,[@]GODIR[@],$(godir),g'
+  -e 's,[@]MODDIR[@],$(guilemoduledir),g'       \
+  -e 's,[@]GODIR[@],$(guileobjectdir),g'
 
 scripts/gash: scripts/gash.in Makefile
 	$(do_subst) < $(srcdir)/scripts/gash.in > scripts/gash
@@ -246,11 +226,10 @@ XFAIL_TESTS =                                   \
 BROKEN_TESTS =                                  \
   tests/50-redirect-merge.sh
 
-EXTRA_DIST =                                    \
+EXTRA_DIST +=                                   \
   scripts/gash.in
 
-CLEANFILES =                                    \
-  $(GOBJECTS)                                   \
+CLEANFILES +=                                   \
   $(bin_SCRIPTS)                                \
   $(FULL_TESTS:tests/%.sh=tests/%.log)          \
   $(FULL_TESTS:tests/%.sh=tests/%.trs)          \

build-aux/guile-rules.am

@@ -0,0 +1,25 @@
+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:
+	$(AM_V_GEN)$(top_builddir)/pre-inst-env \
+	    $(GUILD) compile $(GUILE_WARNINGS) -o "$@" "$<"
+
+EXTRA_DIST = $(GUILE_MODULES)
+
+CLEANFILES = $(GUILE_OBJECTS)