Fix "make TAGS" on MS-Windows.

 lisp/Makefile.in (TAGS TAGS-LISP): Pass the (long) list of *.el files
 through xargs, to avoid failure due to MS-Windows limitations on
 command-line length.

 src/Makefile.in (ctagsfiles1, ctagsfiles2): Don't include *.m files.
 (ctagsfiles3): New variable, includes only *.m files.
 (TAGS): Use an explicit language name in the regular expressions,
 to avoid transformation of '/SOMETHING' by MSYS to
 'c:\MSYS\SOMETHING'.

2 files changed, 9 insertions, 2 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 898bf2615fa..50e4647b438 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,9 @@
+2013-06-07  Eli Zaretskii  <eliz@gnu.org>
+
+        * Makefile.in (TAGS TAGS-LISP): Pass the (long) list of *.el files
+        through xargs, to avoid failure due to MS-Windows limitations on
+        command-line length.
+
 2013-06-06  Glenn Morris  <rgm@gnu.org>
 
         * font-lock.el (lisp-font-lock-keywords-2):
diff --git a/lisp/Makefile.in b/lisp/Makefile.in
index 4884213daeb..61449b66c9b 100644
--- a/lisp/Makefile.in
+++ b/lisp/Makefile.in
@@ -209,8 +209,9 @@ update-authors:
         $(emacs) -l authors -f batch-update-authors $(top_srcdir)/etc/AUTHORS $(top_srcdir)
 
 TAGS TAGS-LISP: $(lisptagsfiles1) $(lisptagsfiles2) $(lisptagsfiles3) $(lisptagsfiles4)
-        els=`echo $(lisptagsfiles1) $(lisptagsfiles2) $(lisptagsfiles3) $(lisptagsfiles4) | sed -e "s,$(lisp)/[^ ]*loaddefs[^ ]*,," -e "s,$(lisp)/ldefs-boot[^ ]*,,"`; \
-        ${ETAGS} -o $@ $$els
+        rm -f $@; touch $@; \
+         echo $(lisptagsfiles1) $(lisptagsfiles2) $(lisptagsfiles3) $(lisptagsfiles4) | sed -e "s,$(lisp)/[^ ]*loaddefs[^ ]*,," -e "s,$(lisp)/ldefs-boot[^ ]*,," | \
+        xargs $(XARGS_LIMIT) ${ETAGS} -a -o $@
 
 # The src/Makefile.in has its own set of dependencies and when they decide
 # that one Lisp file needs to be re-compiled, we had better recompile it as