gcc-3.1.1: make bootstrap fails on Darwin/Altivec

[Kaspar Fischer <fischerk at inf dot ethz dot ch>]

Dear everybody,
I'm trying to build gcc-3.1.1 on MacOS 10.1.5 (PowerBook G4).  I am not 
an expert, so please excuse me if I am doing something silly.

I started with

   ../gcc-3.1.1/configure --prefix=/usr/local/gcc-3.1.1 --enable-altivec 
--enable-languages=c,c++

followed by 'make bootstrap'.  The latter failed as follows:

...
./xgcc -B./ -B/usr/local/gcc-3.1.1/powerpc-apple-darwin5.5/bin/ -isystem 
/usr/local/gcc-3.1.1/powerpc-apple-darwin5.5/include -isystem 
/usr/local/gcc-3.1.1/powerpc-apple-darwin5.5/sys-include -O2  
-DIN_GCC    -W -Wall -Wwrite-strings -Wstrict-prototypes 
-Wmissing-prototypes -isystem ./include   -g  -DIN_LIBGCC2 
-D__GCC_FLOAT_NOT_NEEDED  -I. -I. -I../../gcc-3.1.1/gcc 
-I../../gcc-3.1.1/gcc/. -I../../gcc-3.1.1/gcc/config 
-I../../gcc-3.1.1/gcc/../include -fexceptions -c 
../../gcc-3.1.1/gcc/unwind-dw2.c -o libgcc/./unwind-dw2.o
../../gcc-3.1.1/gcc/unwind-dw2.c: In function `extract_cie_info':
../../gcc-3.1.1/gcc/unwind-dw2.c:226: warning: implicit declaration of 
function `strlen'
../../gcc-3.1.1/gcc/unwind-dw2.c: In function `uw_frame_state_for':
../../gcc-3.1.1/gcc/unwind-dw2.c:899: warning: implicit declaration of 
function `memset'
../../gcc-3.1.1/gcc/unwind-dw2.c: In function `uw_install_context_1':
../../gcc-3.1.1/gcc/unwind-dw2.c:1181: warning: implicit declaration of 
function `memcpy'
/var/tmp//ccWKPvXc.s:3286:vector instruction is optional for the PowerPC 
(not allowed without -force_cpusubtype_ALL option)
/var/tmp//ccWKPvXc.s:3289:vector instruction is optional for the PowerPC 
(not allowed without -force_cpusubtype_ALL option)
...
/var/tmp//ccWKPvXc.s:4088:vector instruction is optional for the PowerPC 
(not allowed without -force_cpusubtype_ALL option)
make[3]: *** [libgcc/./unwind-dw2.o] Error 1
make[2]: *** [stmp-multilib] Error 2
make[1]: *** [stage1_build] Error 2
make: *** [bootstrap] Error 2

I guess there is something wrong with the assembler because the problem 
arises in a .s-file.  Can somebody help me?

Thanks a lot,
Kaspar