ffs problem in windows64

[Christian Franke]

Christian Franke wrote:
> This segfaults if gcc -fno-builtin option is used:
>   ffs(0x80000000)
>
> These work:
>   ffs(0xc0000000)
>   ffs(0x40000000)
>
> Likely a subtle problem in table based ffs() implementation in 
> winsup/cygwin/syscalls.cc if only upper bit is set. The newlib version 
> of ffs() works.
>

https://cygwin.com/ml/cygwin-patches/2014-q3/msg00014.html


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