Potential of a compiler that creates the executable at once

[Dennis]

On Friday, 11 February 2022 at 06:33:20 UTC, Walter Bright wrote:
> Now suppose X.obj and Y.obj both define foo. Link with:
>
>     link X.obj Y.obj A.lib B.lib C.lib
>
> You get a message:
>
>     Multiple definition of "foo", found in X.obj and Y.obj

Don't rely on this when using DMD though, since it likes to place 
all functions in COMDATs, meaning the linker will just pick one 
`foo` instead of raising an error.

https://github.com/dlang/dmd/blob/a176f0359a07fa5a252518b512f3b085a43a77d8/src/dmd/backend/backconfig.d#L303
https://issues.dlang.org/show_bug.cgi?id=15342