Re: [PATCH] mk: don't escape '#' for `grep`

[Florian Weimer <fw@deneb.enyo.de>]

* Alejandro Colomar:

> Could you please try to find out the cause of the actual problem?  Maybe
> there's a fix that doesn't involve reverting that patch.  Or maybe
> there's a bug in some tool, and we can report it.

NEWS in GNU make explains this:

* WARNING: Backward-incompatibility!
  Number signs (#) appearing inside a macro reference or function invocation
  no longer introduce comments and should not be escaped with backslashes:
  thus a call such as:
    foo := $(shell echo '#')
  is legal.  Previously the number sign needed to be escaped, for example:
    foo := $(shell echo '\#')
  Now this latter will resolve to "\#".  If you want to write makefiles
  portable to both versions, assign the number sign to a variable:
    H := \#
    foo := $(shell echo '$H')
  This was claimed to be fixed in 3.81, but wasn't, for some reason.
  To detect this change search for 'nocomment' in the .FEATURES variable.

Applying the $H suggestion seems harmless enough, although this make
change seems to be fairly problematic in general.