On Monday, 19 September 2016 at 14:04:03 UTC, Andrei Alexandrescu wrote:

Interesting. What happens e.g. if one makes a change to a function whose generated code is somewhere in the middle of the object file? If it doesn't alter the call graph, doesn't the new .o file share a common prefix with the old one?

Only if the TOC is unchanged.
There are a lot of common sections in the same order but with different offsets.
we would need some binary patching method.

But I am unaware of file-systems supporting this.
Microsofts incremental linking mechnism makes use of thunks so it can avoid changing the header iirc.

But all of this needs codegen to adept.

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