On Wed, Nov 17 2021, Mike Hommey wrote:

On Tue, Nov 16, 2021 at 01:00:21PM +0100, Ævar Arnfjörð Bjarmason wrote:

quoted

+### Remove GNU make implicit rules
+
+## This speeds things up since we don't need to look for and stat() a
+## "foo.c,v" every time a rule referring to "foo.c" is in play. See
+## "make -p -f/dev/null | grep ^%::'".
+%:: %,v
+%:: RCS/%,v
+%:: RCS/%
+%:: s.%
+%:: SCCS/s.%

`MAKEFLAGS += -r` should have the same effect (and more)

Yeah, I did try that. It's a much bigger hammer though, and throws out
all implicit rules, some of which we may use (I'm not sure). I've
updated the commit message to note this.

In terms of performance it doesn't seem to matter over the above more
narrow change.