[bfin] Make bfin-uclinux more like linux target

[Bernd Schmidt]

Jie Zhang wrote:
> Mainly this patch includes common linux.h for bfin-uclinux target. It 
> also removes redundant macros from bfin target files. It fixes several 
> C99 builtin function tests for bfin-uclinux-gcc:
> 
> Tests that now work, but didn't before:
> 
> gcc.dg/builtins-20.c (test for excess errors)
> gcc.dg/torture/builtin-convert-1.c  -O1  (test for excess errors)
[...]

I have no objection in principle, but I don't think I've seen a good 
explanation yet why this fixes any testsuite failures?


Bernd
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