[RFC] Update minimum make version to 3.81

[Mike Frysinger]

On 24 Jun 2016 18:31, Florian Weimer wrote:
> On 06/24/2016 06:10 PM, Mike Frysinger wrote:
> > On 24 Jun 2016 13:24, Florian Weimer wrote:
> >> On 06/11/2016 12:27 AM, Roland McGrath wrote:
> >>> eval is a pretty horrible feature and I'd probably object to introducing
> >>> any uses of it into libc's makefiles.  We already have lots of things that
> >>> might have been done that way, but are instead done with generated makefiles.
> >>
> >> I would like to put this into malloc/Makefile:
> >>
> >> $(foreach t,$(tests),$(eval CFLAGS-$t.c += -DTEST_NO_MALLOPT))
> >>
> >> What's the alternative for adding a -D flag to every test compilation in
> >> a subdirectory?
> >
> > maybe something like (untested):
> > CPPFLAGS += $(if $(filter $(@F),$(tests)),-DTEST_NO_MALLOPT)
> 
> Hmm, right.  It's relying on the delayed expansion.  Not sure how this 
> is less evil, though.  It also has at least quadratic run-time behavior.

what about using target-specific variables and relying on inheritance [1] ?
does this work ?
$(tests): CPPFLAGS += ...

[1] https://www.gnu.org/software/make/manual/html_node/Target_002dspecific.html
-mike
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