DMD, LDC, and GDC compilers and 32/64 bit

[Joseph Rushton Wakeling via digitalmars-d-ldc]

On Sunday, 18 June 2017 at 17:42:13 UTC, David Nadlinger wrote:
> Both -m32 and -m64 are available on any host with LDC. However, 
> usually you wouldn't find 64 bit standard libraries with a 32 
> bit build – not because of any technical reason, but just 
> because multilib setups in that direction are far less 
> useful/common.

Beyond 32/64 bit, does this also affect practical support for 
other target architectures (e.g. ARM)?

Can you in any case point to some guidelines on how best to build 
LDC so as to have the maximum possible target support 
library-wise?  It would be good to try to ensure the snap package 
supports this.