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

[Hendrik de Goede]

Follow-up Comment #1, bug #20501 (project make):

I'm using GNU make 3.81 through cygwin on Windows XP.

The -rR flags are not the only ones not working as expected (expected by me
at least), the option -S doesn't work as well.
However, when running a subsequent call from the Makefile, they all work just
fine.
The flags '--no-print-directory', '-s' and '--warn-undefined-variables'
function properly immediately.

The main problem I'm having with this is that we use various .mk files which
can be included from the Makefile. I want to set defaults for the programs,
flags and such (like CC ?= gcc) in those .mk files. But this 'bug' prevents me
from doing so, as CC already gets a default value.



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