[bug #20501] "MAKEFLAGS += -rR" doesn't turn off default suffix rules, variables

[Hendrik de Goede]

Follow-up Comment #7, bug #20501 (project make):

Does it matter that the built-in variables get set before reading makefiles?
I hope not.
I think the people involved in this project are clever enough to unset a
'default' variable if the make flag -R is encountered.

I mean, the 'origin' function in makefiles can determine just that, if its
value is default or not, so there must be some functionality in the sources to
determine so. I guess there's also some sort of functionality to loop through
all the defined variables.

Combine the two and what do you get?
Exactly what it should do... well, at least what I suggested :)

The documentation should then be updated to state that -r should come before
any rule, and -R before any inbuilt variable gets a conditional assignment
(the ?= assignment).

As for -r working properly, that's great, but then -p should be fixed.

p.s. The 'ifeq ($(filter -r,$(MAKEFLAGS)),)' isn't really needed, -r won't
get added twice.

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