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From: Szabolcs Nagy <nsz@port70.net>
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Subject: Re: Design idea for subarchs/abivariants
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* Rich Felker <dalias@aerifal.cx> [2012-11-28 14:26:18 -0500]:
> 2. Making bits/endian.h, bits/fenv.h, and any other bits headers that
> need to vary per-subarch into generated headers. I think this could be
> accomplished with a single rule for generating bits/%.h from
> bits/%.h.sh the way alltypes.h is generated now. The full
> $(ARCH)$(ENDIAN)$(SUBARCH) could be passed to the script as $1,
> allowing simple shell logic to choose the right version to output.

i'm not sure about having many generated headers..

it could be a single generated bits/config.h with

#define __FPU 1
#define __BYTEORDER 1234

and other bits/*.h could use these macros

this way the generator is probably simpler,
the drawback is that the cpp may need to do more
work if bits/*.h have many conditional #if __FPU etc