Avoid having a directory as a prerequisite in doc Makefiles.

It does not play well with time-stamping.

* doc/misc/Makefile.in ($(infodir)): Delete rule.
(mkinfodir): New.  Use it in all the info rules, rather than depending
on infodir.

* doc/lispref/Makefile.in ($(infodir)): Delete rule.
(mkinfodir): New.
($(infodir)/elisp): Use $mkinfodir instead of infodir.

* doc/lispintro/Makefile.in ($(infodir)): Delete rule.
(mkinfodir): New.
($(infodir)/eintr): Use $mkinfodir instead of infodir.

* doc/emacs/Makefile.in ($(infodir)): Delete rule.
(mkinfodir): New.
($(infodir)/emacs): Use $mkinfodir instead of infodir.

2 files changed, 10 insertions, 4 deletions

diff --git a/doc/lispref/ChangeLog b/doc/lispref/ChangeLog
index 8a3242a6859..262c3bc4826 100644
--- a/doc/lispref/ChangeLog
+++ b/doc/lispref/ChangeLog
@@ -1,5 +1,11 @@
 2010-10-09  Glenn Morris  <rgm@gnu.org>
 
+        * Makefile.in ($(infodir)): Delete rule.
+        (mkinfodir): New.
+        ($(infodir)/elisp): Use $mkinfodir instead of infodir.
+
+2010-10-09  Glenn Morris  <rgm@gnu.org>
+
         * Makefile.in (emacsdir): New variable.
         (MAKEINFO): Add -I $emacsdir.
         (dist): Copy emacsver.texi.
diff --git a/doc/lispref/Makefile.in b/doc/lispref/Makefile.in
index 4336a25d5ee..e5786bfd5f2 100644
--- a/doc/lispref/Makefile.in
+++ b/doc/lispref/Makefile.in
@@ -96,6 +96,8 @@ srcs = \
   $(srcdir)/gpl.texi \
   $(srcdir)/doclicense.texi
 
+mkinfodir = @test -d ${infodir} || mkdir ${infodir} || test -d ${infodir}
+
 .PHONY: info dvi pdf
 
 # The info file is named `elisp'.
@@ -103,10 +105,8 @@ info: $(infodir)/elisp
 dvi: elisp.dvi
 pdf: elisp.pdf
 
-$(infodir):
-        mkdir $@ || test -d $@
-
-$(infodir)/elisp: $(infodir) $(srcs)
+$(infodir)/elisp: $(srcs)
+        $(mkinfodir)
         cd $(srcdir); $(MAKEINFO) -I. -I$(texinfodir) elisp.texi -o $@
 
 elisp.dvi: $(srcs)