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  41 Date: Thu, 13 Feb 2014 02:10:27 -0500\r
  42 From: Austin Clements <amdragon@MIT.EDU>\r
  43 To: Tomi Ollila <tomi.ollila@iki.fi>\r
  44 Subject: Re: [PATCH 1/1] emacs: always write emacs/.eldeps when the target is\r
  45         remade\r
  46 Message-ID: <20140213071026.GX4375@mit.edu>\r
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  81 \r
  82 Quoth Tomi Ollila on Jan 25 at 12:21 pm:\r
  83 > So that the target is newer than its prerequisites.\r
  84 > ---\r
  85 >  emacs/Makefile.local | 3 +--\r
  86 >  1 file changed, 1 insertion(+), 2 deletions(-)\r
  87 > \r
  88 > diff --git a/emacs/Makefile.local b/emacs/Makefile.local\r
  89 > index 42bfbd9..d5d402e 100644\r
  90 > --- a/emacs/Makefile.local\r
  91 > +++ b/emacs/Makefile.local\r
  92 > @@ -32,8 +32,7 @@ emacs_bytecode = $(emacs_sources:.el=.elc)\r
  93 >  ifeq ($(HAVE_EMACS),1)\r
  94 >  $(dir)/.eldeps: $(dir)/Makefile.local $(dir)/make-deps.el $(emacs_sources)\r
  95 >       $(call quiet,EMACS) --directory emacs -batch -l make-deps.el \\r
  96 > -             -f batch-make-deps $(emacs_sources) > $@.tmp && \\r
  97 > -             (cmp -s $@.tmp $@ || mv $@.tmp $@)\r
  98 > +             -f batch-make-deps $(emacs_sources) > $@.tmp && mv $@.tmp $@\r
  99 >  -include $(dir)/.eldeps\r
 100 >  endif\r
 101 >  CLEAN+=$(dir)/.eldeps $(dir)/.eldeps.tmp\r
 102 \r
 103 Is this just so the rule doesn't get run again on the next make\r
 104 invocation (unless, of course, a dependent changed)?\r
 105 \r
 106 Interestingly, if any of the dependents have changed, but in ways that\r
 107 don't affect .eldeps, this change will make the build more expensive\r
 108 because it will trigger a make restart after .eldeps is updated.\r