New GNU Make regression? Why some Makefile.inc's romstage-options get interpreted as Makefile targets?

While trying to build the ancient (<=4.11) versions of coreboot for
research purposes, I get

    CC         romstage/superio/winbond/common/early_init.o
    LINK       cbfs/fallback/romstage.debug
    OBJCOPY    cbfs/fallback/romstage.elf
make: *** No rule to make target '".car.data"', needed by
'build/coreboot.pre'.  Stop.

because of the following Makefile.inc line:

$(CONFIG_CBFS_PREFIX)/romstage-options := -S ".car.data"

If I comment out this line, I get "No rule to make target '-P'" because of

$(CONFIG_CBFS_PREFIX)/romstage-options += -P $(CONFIG_XIP_ROM_SIZE)

If I comment out this too, everything goes well until the final
coreboot.rom assembly stage, where a cbfstool prints "E: Encountered
illegal degenerate region name in -r list" and deletes my coreboot.rom

However, " $(CONFIG_CBFS_PREFIX)/romstage-options += --xip " is fine
and doesn't cause any problems...

Please tell, why these errors are happening now and not before? My
host's GNU make --version is 4.4.1, but I tried everything down to 4.3
and still can't properly get rid of these errors (unfortunately can't
use 4.2.1 because it gives a segmentation fault on new Linux)
-- 
Best regards, Mike Banon
Open Source Community Manager of 3mdeb - https://3mdeb.com/
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