Build tweaks related to tags files.

* lib-src/Makefile.in (tagsfiles): New variable.
(TAGS): Also depend on the source files.  Use our own etags program.
* lisp/Makefile.in (ETAGS): Add EXEEXT.
(lisptagsfiles1, lisptagsfiles2, lisptagsfiles3, lisptagsfiles4):
Remove.
(tagsfiles): New, replacing lisptagsfiles1 etc.
Remove irrelevant source files here rather than in the TAGS rule.
(${ETAGS}): New rule.
(TAGS): Also depend on the etags executable.
* lwlib/Makefile.in (EXEEXT): New, set by configure.
(ETAGS): Add EXEEXT.
(${ETAGS}): New rule.
(ctagsfiles): Use "wildcard".
(TAGS): Also depend on the etags executable.
* nt/Makefile.in (ETAGS, tagsfiles): New variables.
(${ETAGS}): New rule.
(TAGS): Fix dependencies.
* oldXMenu/Makefile.in (EXEEXT): New, set by configure.
(ETAGS): New variable, replacing $TAGS.  Use our own etags program.
Remove "-t" argument.
(${ETAGS}): New rule.
(tagsfiles): New variable.
(TAGS): New rule, with proper dependencies.
* src/Makefile.in (ETAGS): Add EXEEXT.  Add a build rule.
(ctagsfiles1, ctagsfiles2): Use "wildcard".
(ctagsfiles3): Remove.
(TAGS): Depend on etags.
(../lisp/TAGS, $(lwlibdir)/TAGS): Let the rules in the relevant
directories decide if updates are needed.

1 files changed, 12 insertions, 10 deletions

diff --git a/lisp/Makefile.in b/lisp/Makefile.in
index 3d0c95dcb5e..5f72e6ce23e 100644
--- a/lisp/Makefile.in
+++ b/lisp/Makefile.in
@@ -220,26 +220,28 @@ update-authors:
 	$(emacs) -L "$(top_srcdir)/admin" -l authors \
 	  -f batch-update-authors "$(top_srcdir)/etc/AUTHORS" "$(top_srcdir)"
 
+FORCE:
+.PHONY: FORCE
 
-ETAGS = ../lib-src/etags
+tagsfiles = $(shell find ${srcdir} -name '*.el')
+tagsfiles := $(filter-out ${srcdir}/%loaddefs.el,${tagsfiles})
+tagsfiles := $(filter-out ${srcdir}/ldefs-boot.el,${tagsfiles})
+tagsfiles := $(filter-out ${srcdir}/eshell/esh-groups.el,${tagsfiles})
 
-lisptagsfiles1 = $(srcdir)/*.el
-lisptagsfiles2 = $(srcdir)/*/*.el
-lisptagsfiles3 = $(srcdir)/*/*/*.el
-lisptagsfiles4 = $(srcdir)/*/*/*/*.el
+ETAGS = ../lib-src/etags${EXEEXT}
+
+${ETAGS}: FORCE
+	${MAKE} -C ../lib-src $(notdir $@)
 
 ## The ls | sed | xargs is to stop the command line getting too long
 ## on MS Windows, when the MSYS Bash passes it to a MinGW compiled
 ## etags.  It might be better to use find in a similar way to
 ## compile-main.  But maybe this is not even necessary any more now
 ## that this uses relative filenames.
-TAGS: $(lisptagsfiles1) $(lisptagsfiles2) $(lisptagsfiles3) $(lisptagsfiles4)
+TAGS: ${ETAGS} ${tagsfiles}
 	rm -f $@
 	touch $@
-	ls $(lisptagsfiles1) $(lisptagsfiles2) \
-	   $(lisptagsfiles3) $(lisptagsfiles4) | \
-	    sed -e '/loaddefs/d; /\/ldefs-boot/d; /esh-groups\.el/d' | \
-	    xargs $(XARGS_LIMIT) "$(ETAGS)" -a -o $@
+	ls ${tagsfiles} | xargs $(XARGS_LIMIT) "${ETAGS}" -a -o $@
 
 
 # The src/Makefile.in has its own set of dependencies and when they decide