On Jan 5, 2017 9:03 AM, "Jonathan Wakely" <jwakely@fedoraproject.org> wrote:.

The main
difference would be installation/deployment. The idea would be that instead of
the 32-bit and 64-bit runtimes being installed directly in parallel on the base
system, they would instead be installed into effectively a chroot with its own
completely 32-bit runtime.

Which changes how software is built, surely.

Tom's use case is where you simply invoke "gcc -m32" on the base
system and (assuming the relevant 32-bit versions of the libs are
present in /usr/lib) it Just Works.

If the 32-bit headers and libs aren't present on the base system then
you have to change how the software is built.

The Linux kernel needs gcc -m32 to work for freestanding programs.

Linux's x86 test suite likes normal glibc programs built with gcc -m32 to work.