[uml-user] 64-bit UML with 32-bit root

[Mark M. L. <mar...@te...>]

The (unofficial?) FAQ at http://uml.devloop.org.uk/faq.html implies that 
it is possible to build UML on a 64-bit system to run a 32-bit guest.

The best that I can manage on e.g. Debian "Jessie" x86-64 is to use 
make ARCH=um SUBARCH=i386  which results in a 32-bit ELF to presumably 
run a 32-bit guest. Prerequisites appear to be the multiarch-support 
  and gcc-multiarch packages.

Is it possible to build UML as a 64-bit binary, but to run a 32-bit 
guest? What I'd like to be able to do is to put it on a system which has 
no multiarch stuff, i.e. to completely sequester the 32-bit libraries 
etc. within the guest filesystem.

[Background: I used UML fairly heavily in the 2.4 era, but I'm a 
comparative newcomer to x86-64. I'm trying to avoid overuse of 
multi-arch stuff.]

-- 
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk

[Opinions above are the author's, not those of his employers or colleagues]