Follow-up Comment #1, bug #64107 (project make):
$ ls
makefile
$ cat makefile
$(info 0 CC=$(CC), $$(origin CC) = $(origin CC), makeflags = $(MAKEFLAGS))
MAKEFLAGS:=R
$(info 1 CC=$(CC), $$(origin CC) = $(origin CC), makeflags = $(MAKEFLAGS))
CC ?= gcc
$(info 2 CC=$(CC), $$(origin CC) = $(origin CC), makeflags = $(MAKEFLAGS))
all:; $(info 3 CC=$(CC), $$(origin CC) = $(origin CC) makeflags =
$(MAKEFLAGS))
$ make-4.4
0 CC=cc, $(origin CC) = default, makeflags =
1 CC=cc, $(origin CC) = default, makeflags = R
2 CC=cc, $(origin CC) = default, makeflags = R
3 CC=, $(origin CC) = undefined makeflags = rR
make-4.4: 'all' is up to date.
$
We can see here that after -R was set in MAKEFLAGS, CC still had value cc,
until build time.
Similarly, -r was missing from makeflags until build time.
This fails conditional assignment like
MAKEFLAGS:=R
CC ?= gcc
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