On Sunday, 22 May 2016 at 21:22:30 UTC, Richard Delorme wrote:
A question: why singleobj is not activated by a -Ox options?

It changes compiler behaviour – only a single object file is produced. Historically, the default behaviour was used by some people/build systems for incremental compilation.

However, since incremental compilation only works when exactly the same (sub)sets of commands are invoked every time these days, -singleobj should arguably be on by default, at least when producing an executable.

This is actually what ldmd2 does already, but we should probably take the plunge and break backwards compatibility to enable it for the main driver too. I can't think of a scenario where you wouldn't want to be using it.

 — David

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