Re: [PATCH 1/1] emacs: always write emacs/.eldeps when the target is remade

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+Date: Thu, 13 Feb 2014 02:10:27 -0500\r
+From: Austin Clements <amdragon@MIT.EDU>\r
+To: Tomi Ollila <tomi.ollila@iki.fi>\r
+Subject: Re: [PATCH 1/1] emacs: always write emacs/.eldeps when the target is\r
+       remade\r
+Message-ID: <20140213071026.GX4375@mit.edu>\r
+References: <1390645309-2326-1-git-send-email-tomi.ollila@iki.fi>\r
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+\r
+Quoth Tomi Ollila on Jan 25 at 12:21 pm:\r
+> So that the target is newer than its prerequisites.\r
+> ---\r
+>  emacs/Makefile.local | 3 +--\r
+>  1 file changed, 1 insertion(+), 2 deletions(-)\r
+> \r
+> diff --git a/emacs/Makefile.local b/emacs/Makefile.local\r
+> index 42bfbd9..d5d402e 100644\r
+> --- a/emacs/Makefile.local\r
+> +++ b/emacs/Makefile.local\r
+> @@ -32,8 +32,7 @@ emacs_bytecode = $(emacs_sources:.el=.elc)\r
+>  ifeq ($(HAVE_EMACS),1)\r
+>  $(dir)/.eldeps: $(dir)/Makefile.local $(dir)/make-deps.el $(emacs_sources)\r
+>      $(call quiet,EMACS) --directory emacs -batch -l make-deps.el \\r
+> -            -f batch-make-deps $(emacs_sources) > $@.tmp && \\r
+> -            (cmp -s $@.tmp $@ || mv $@.tmp $@)\r
+> +            -f batch-make-deps $(emacs_sources) > $@.tmp && mv $@.tmp $@\r
+>  -include $(dir)/.eldeps\r
+>  endif\r
+>  CLEAN+=$(dir)/.eldeps $(dir)/.eldeps.tmp\r
+\r
+Is this just so the rule doesn't get run again on the next make\r
+invocation (unless, of course, a dependent changed)?\r
+\r
+Interestingly, if any of the dependents have changed, but in ways that\r
+don't affect .eldeps, this change will make the build more expensive\r
+because it will trigger a make restart after .eldeps is updated.\r