[Buildroot] support for SuperH

[Buildroot] support for SuperH

[Alex Song]

Hi,

Looks like buildroot supports SuperH, but I got
several errors when trying to use it.

1. When I select sh3, it tries to install the kernel
headers by "make ARCH=sh3 ...". But kernel only has
arch sh. I changed top level Config.in and made this
pass. 

2. Then duing building, it complains

make[1]: Entering directory
`/root/lab/buildroot-sh/buildroot/toolchain_build_sh/uClibc'
  CC libc/sysdeps/linux/sh/syscall.os
libc/sysdeps/linux/sh/syscall.c:11: error: conflicting
types for 'syscall'
./include/unistd.h:1014: error: previous declaration
of 'syscall' was here
make[2]: *** [libc/sysdeps/linux/sh/syscall.os] Error
1

   The syscall.c has 
long syscall(long sysnum,
             long arg1, long arg2, long arg3,
             long arg4, long arg5, long arg6)

   while unistd.h has 

extern long int syscall (long int __sysno, ...)
__THROW;

  Is there a fix? What is the correct way to build a
toolchain for sh?

Thanks a lot,

Alex




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