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, 5 insertions, 2 deletions

diff --git a/lib-src/Makefile.in b/lib-src/Makefile.in
index 2b65cb2e1a9..b666508e593 100644
--- a/lib-src/Makefile.in
+++ b/lib-src/Makefile.in
@@ -345,9 +345,12 @@ extraclean: maintainer-clean
 check:
 	@echo "We don't have any tests for the lib-src/ directory yet."
 
+tagsfiles = $(wildcard ${srcdir}/*.[ch])
+
+.PHONY: tags
 tags: TAGS
-TAGS: etags${EXEEXT}
-	etags *.[ch]
+TAGS: etags${EXEEXT} ${tagsfiles}
+	./etags ${tagsfiles}
 
 ../lib/libgnu.a: $(config_h)
 	$(MAKE) -C ../lib all