Building with -m32/-m31 support without multilibs

[Florian Weimer <fweimer@xxxxxxxxxx>]

I have a 64-bit GNU/Linux system (x86-64 or s390x) and want to build GCC 
with -m32 or -m31 support in the compiler.  However, I do not have glibc 
for i386 or s390 installed, only the native (64-bit) version.  This 
means that I need to build with --disable-multilib.

Is there still a way to get -m32 or -m31 support in the compiler, for 
compiling and linking with -nostdlib?

Thanks,
Florian