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/src/Makefile.in b/src/Makefile.in
index f96ebb2aeeb..97505b98687 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -649,32 +649,34 @@ extraclean: distclean
         -rm -f *~ \#*
 
 
-ETAGS = ../lib-src/etags
+ETAGS = ../lib-src/etags${EXEEXT}
 
-ctagsfiles1 = [xyzXYZ]*.[hc]
-ctagsfiles2 = [a-wA-W]*.[hc]
-ctagsfiles3 = [a-zA-Z]*.m
+${ETAGS}: FORCE
+        ${MAKE} -C ../lib-src $(notdir $@)
+
+ctagsfiles1 = $(wildcard ${srcdir}/*.[hc])
+ctagsfiles2 = $(wildcard ${srcdir}/*.m)
 
 ## FIXME? In out-of-tree builds, should TAGS be generated in srcdir?
 
 ## This does not need to depend on ../lisp and ../lwlib TAGS files,
 ## because etags "--include" only includes a pointer to the file,
 ## rather than the file contents.
-TAGS: $(srcdir)/$(ctagsfiles1) $(srcdir)/$(ctagsfiles2) $(srcdir)/$(ctagsfiles3)
-        "$(ETAGS)" --include=../lisp/TAGS --include=$(lwlibdir)/TAGS \
+TAGS: ${ETAGS} $(ctagsfiles1) $(ctagsfiles2)
+        ${ETAGS} --include=../lisp/TAGS --include=$(lwlibdir)/TAGS \
           --regex='{c}/[        ]*DEFVAR_[A-Z_  (]+"\([^"]+\)"/\1/' \
           --regex='{c}/[        ]*DEFVAR_[A-Z_  (]+"[^"]+",[    ]\([A-Za-z0-9_]+\)/\1/' \
-          $(srcdir)/$(ctagsfiles1) $(srcdir)/$(ctagsfiles2) \
+          $(ctagsfiles1) \
           --regex='{objc}/[     ]*DEFVAR_[A-Z_  (]+"\([^"]+\)"/\1/' \
           --regex='{objc}/[     ]*DEFVAR_[A-Z_  (]+"[^"]+",[    ]\([A-Za-z0-9_]+\)/\1/' \
-          $(srcdir)/$(ctagsfiles3)
+          $(ctagsfiles2)
 
 ## Arrange to make tags tables for ../lisp and ../lwlib,
 ## which the above TAGS file for the C files includes by reference.
-../lisp/TAGS:
+../lisp/TAGS: FORCE
         $(MAKE) -C ../lisp TAGS ETAGS="$(ETAGS)"
 
-$(lwlibdir)/TAGS:
+$(lwlibdir)/TAGS: FORCE
         $(MAKE) -C $(lwlibdir) TAGS ETAGS="$(ETAGS)"
 
 tags: TAGS ../lisp/TAGS $(lwlibdir)/TAGS