Obsolete GDB's m32r support

[Frank Ch. Eigler]

cagney wrote:

> [...] This target does not use GDB's multi-arch framework and all
> such targets are either being obsoleted or multi-arched.  [...]

Can you summarize the technical reasons for this dichotomy of
outcomes?  In what way does the presence of old targets pose a
technical challenge to more modern multiarch'd ones?  In other words,
what technical reasons exist to not allow old targets to stick around
as they are?


- FChE