Re: Flag --no-builtin-rules etc. just for this makefile (no flag inheritance)

[R. Diez]

> It can be verified with a minimal Makefile that "make --print-data-base"
> shows an absence of built-in rules if MAKEFLAGS += --no-builtin-rules is
> present, and likewise that --no-builtin-variables causes the variables
> to disappear.
> [...]

Well, let's verify it then:

Contents of file "makefile":

  MAKEFLAGS += --no-builtin-variables

  $(info CC: $(CC))

Commands I used to test this scenario:

  $ make --version
  GNU Make 4.3
  Built for x86_64-pc-linux-gnu

  $ echo "The value of CC is: $CC"
  The value of CC is:

  $ make --file makefile
  CC: cc
  make: *** No targets. Stop.

  $ make --file makefile  --no-builtin-variables
  CC:
  make: *** No targets. Stop.

So it looks like "MAKEFLAGS += --no-builtin-variables" is not working,  is it?

Note that --no-builtin-rules does work. I meant that adding --no-builtin-variables to MAKEFLAGS does not automatically enable --no-builtin-rules, as 
it does when --no-builtin-variables is specified on the command line (as documented).

Regards,
  rdiez