Embedded white space in out-of-tree module full pathname

[Mason]

Hello,

I'd like some confirmation that this is either not supported, or that
I'm doing something obviously wrong. (Kernel 3.14 if it matters.)

Suppose the source code for an out-of-tree kernel module is stored e.g.
in "/tmp/foo bar/module" (note the embedded space in the path name)

Here is the Makefile template I'm using. (Maybe it's wrong.)

/tmp/foo bar/module$ cat Makefile
KDIR          ?= /home/mason/linux-3.14
ARCH          ?= arm
CROSS_COMPILE ?= arm-none-linux-gnueabi-

obj-m += mytest.o

all:
	make -C $(KDIR) M="$$PWD"

clean:
	make -C $(KDIR) M="$$PWD" clean

/tmp/foo bar/module$ make
make -C /home/mason/linux-3.14 M="$PWD"
make[1]: Entering directory `/home/mason/linux-3.14'
scripts/Makefile.build:44: /tmp/foo/Makefile: No such file or directory
make[2]: *** No rule to make target `/tmp/foo/Makefile'.  Stop.
make[1]: *** [_module_/tmp/foo] Error 2
make[1]: Leaving directory `/home/mason/linux-3.14'
make: *** [all] Error 2


Does the kernel build system support building an out-of-tree module whose
full pathname contains embedded white space, like in my example?

Do I have an obvious mistake in my Makefile?

Regards.
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