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

[Boris Kolpackov]

Follow-up Comment #6, bug #20501 (project make):

Actually adding -r to MAKEFLAGS does work. It just that -p still prints the
rules as if they were there. I use the following makefile fragment in our
build system to get rid of all built-in (suffix and pattern) rules:

# Remove all built-in rules.
#
.SUFFIXES:

ifeq ($(filter -r,$(MAKEFLAGS)),)
MAKEFLAGS += -r
endif

There was a thread on one of the GNU make mailing lists about this
interesting behavior some time ago.

As for adding -R, I think it is quite obvious why it does not work: make sets
built-in variables before it starts reading makefiles.

Boris

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