Errors in compiling gcc4.8.5 using gcc8.1.1

[C.J.]

Dear specialists,

I tried to compile gcc 4.8.5 using gcc 8.1.1.
First I added some lines to gcc-4.8.5/gcc/cp/cfns.{gperf,h} as somewhere
suggests.
   19 #ifdef __GNUC__
   20 __inline
   21 #endif
   22 static unsigned int hash (const char *, unsigned int);
   23 #ifdef __GNUC__
   24 __inline
   25 #ifdef __GNUC_STDC_INLINE__
   26 __attribute__ ((__gnu_inline__))
   27 #endif
   28 #endif
   29 const char * libc_name_p (const char *, unsigned int);

Then I run "./configure --prefix=/home/rx/program/gcc-4.8.5/build
--with-gmp=/home/rx/program/gmp-6.1.0
--with-mpfr=/home/rx/program/mpfr-3.1.4 --disable-multilib
--enable-languages=c,c++,fortran --disable-stage1-checking"
But, there are still some errors as below.

Fixed:  X11/Xw32defs.h
Applying io_quotes_use            to sys/mount.h
Applying io_quotes_use            to sys/raw.h
Cleaning up unneeded directories:
fixincludes is done
echo timestamp > stmp-fixinc
make[3]: Leaving directory
'/home/rx/program/gcc-4.8.5/host-x86_64-unknown-linux-gnu/gcc'
make[2]: *** [Makefile:4157: all-stage1-gcc] Error 2
make[2]: Leaving directory '/home/rx/program/gcc-4.8.5'
make[1]: *** [Makefile:19785: stage1-bubble] Error 2
make[1]: Leaving directory '/home/rx/program/gcc-4.8.5'
make: *** [Makefile:886: all] Error 2

Am I still missing something? Thank you.

Regards,
Jianhao