I tried to build m6811 cross compiler (3.4.0 20040217 prerelease).
Here is a compile error msg. I will upload e_sqrt.i

/home/namsh/c/gnu/gcc/gcc/xgcc -B/home/namsh/c/gnu/gcc/gcc/ -nostdinc
-B/home/namsh/c/gnu/gcc/m6811-elf/mshort/newlib/ -isystem
/home/namsh/c/gnu/gcc/m6811-elf/mshort/newlib/targ-include -isystem
/home/namsh/c/gnu/CVS-gcc/gcc/newlib/libc/include -B/usr/GNUHCS/m6811-elf/bin/
-B/usr/GNUHCS/m6811-elf/lib/ -isystem /usr/GNUHCS/m6811-elf/include -isystem
/usr/GNUHCS/m6811-elf/sys-include  -mshort -DPACKAGE=\"newlib\"
-DVERSION=\"1.12.0\"  -I. -I../../../../../../CVS-gcc/gcc/newlib/libm/math 
-I../../../../../../CVS-gcc/gcc/newlib/libm/math/../common
-DPREFER_SIZE_OVER_SPEED -Os -mrelax -DNO_EXEC -DABORT_PROVIDED -DSMALL_MEMORY
-DMISSING_SYSCALL_NAMES -fno-builtin    -O2 -O2 -static  -g -Os -c
../../../../../../CVS-gcc/gcc/newlib/libm/math/e_sqrt.c
../../../../../../CVS-gcc/gcc/newlib/libm/math/e_sqrt.c: In function
`__ieee754_sqrt':
../../../../../../CVS-gcc/gcc/newlib/libm/math/e_sqrt.c:193: error: unable to
find a register to spill in class `A_OR_D_REGS'
../../../../../../CVS-gcc/gcc/newlib/libm/math/e_sqrt.c:193: error: this is the
insn:
(insn:HI 469 468 470 34
../../../../../../CVS-gcc/gcc/newlib/libm/math/e_sqrt.c:191 (parallel [
            (set (subreg:SI (reg/v:DI 117 [ iw_u ]) 4)
                (lshiftrt:SI (reg/v:SI 61 [ q1 ])
                    (const_int 1 [0x1])))
            (clobber (scratch:HI))
        ]) 129 {*lshrsi3_const1} (insn_list 468 (nil))
    (expr_list:REG_DEAD (reg/v:SI 61 [ q1 ])
        (expr_list:REG_UNUSED (scratch:HI)
            (nil))))
../../../../../../CVS-gcc/gcc/newlib/libm/math/e_sqrt.c:193: confused by earlier
errors, bailing out