Am 15.07.2015 um 17:10 schrieb Dilyan Palauzov:
http://lists.gnu.org/archive/html/bug-make/2015-07/msg00054.html
http://lists.gnu.org/archive/html/bug-make/2015-07/msg00055.html
and tell me, if this is make or Automake problem.
You've been told in the answer you already got that this is not,
actually, a "problem". You opted not to discuss that answer any
further, and just to echo the question elsewhere instead.
It's not make's job, much less automake's, to guess how long individual
production rules might take. The tree of dependencies is walked, that's it.