Per option CFLAGS?

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Hi Kai, Sam.

I have a single file foo.c that I want to generate two (ALSA) modules from, snd-foo2000.ko and snd-foo2001.ko, by compiling with either FOO2000 or FOO2001 defined.
I can do this, and ALSA does this a few times, by providing dummy foo2000.c
and foo2001.c files, like:
=== foo2000.c
#define FOO2000
#include "foo.c"

and a regular Makefile

foo2000-objs := foo2000.o
foo2001-objs := foo2001.o

obj-$(CONFIG_SND_FOO2000) += snd-foo2000.o
obj-$(CONFIG_SND_F002001) += snd-foo2001.o

That #include is a little lame though. Is there a nicer way? I noticed the per-file CFLAGS, but given that it's one source file for both, that doesn't fit.
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