Parallelize clean rules using GNU make features

* Makefile.in: (submake_template): New definition.
(mostlyclean_dirs, clean_dirs, distclean_dirs, maintainer_clean_dirs):
New variables.
(mostlyclean, clean, distclean, bootstrap-clean, maintainer-clean)
(extraclean): Define using each subdirectory as a prequisite.

* lib/Makefile.am (bootstrap-clean):
* doc/emacs/Makefile.in (bootstrap-clean):
* doc/lispintro/Makefile.in (bootstrap-clean):
* doc/lispref/Makefile.in (bootstrap-clean):
* doc/misc/Makefile.in (bootstrap-clean):
* lib-src/Makefile.in (bootstrap-clean):
* lwlib/Makefile.in (bootstrap-clean):
* nextstep/Makefile.in (bootstrap-clean):
* nt/Makefile.in (bootstrap-clean):
* oldXMenu/Makefile.in (bootstrap-clean):
New rules, for symmetry/simplicity.

* lwlib/Makefile.in (mostlyclean, clean, distclean, maintainer-clean):
* oldXMenu/Makefile.in (mostlyclean, clean, distclean, maintainer-clean, tags):
Declare as PHONY.

2 files changed, 6 insertions, 2 deletions

diff --git a/lib-src/ChangeLog b/lib-src/ChangeLog
index 2586cfdd393..74cdf05177f 100644
--- a/lib-src/ChangeLog
+++ b/lib-src/ChangeLog
@@ -1,3 +1,7 @@
+2014-06-15  Glenn Morris  <rgm@gnu.org>
+
+        * Makefile.in (bootstrap-clean): New.
+
 2014-06-13  Glenn Morris  <rgm@gnu.org>
 
         * Makefile.in (../lib/libgnu.a):
diff --git a/lib-src/Makefile.in b/lib-src/Makefile.in
index c7183fe751e..2de64113921 100644
--- a/lib-src/Makefile.in
+++ b/lib-src/Makefile.in
@@ -255,7 +255,7 @@ $(DESTDIR)${archlibdir}: all
         fi
 
 .PHONY: install uninstall mostlyclean clean distclean maintainer-clean
-.PHONY: extraclean check tags
+.PHONY: bootstrap-clean extraclean check tags
 
 install: $(DESTDIR)${archlibdir}
         @echo
@@ -289,7 +289,7 @@ distclean: clean
         -rm -f TAGS
         -rm -f Makefile blessmail
 
-maintainer-clean: distclean
+bootstrap-clean maintainer-clean: distclean
         true
 
 extraclean: maintainer-clean