Dead Code Elimination

[Richard (Rikki) Andrew Cattermole]

On 19/10/2026 4:33 AM, libxmoc wrote:
> I noticed that dmd doesn't do DCE, my executable is quite large for what 
> it does. Any plan to add that? I tried to do it myself, a simple bool in 
> DSymbol + a visitor (yoinked it from the unused import PR) to scan 
> things, and it shrank build time by ~15% and executable went down to 
> 3.5mb from 5.5mb.
> 
> Surely someone smarter than me could do even better.

Doesn't surprise me.

DCE can only work on shared libraries, executables, and local to object 
file symbols (mostly private but also not limited to that i.e. 
ModuleInfo must emit).

The way dmd has traditionally handled it is to emit static libraries and 
let the linker deal with it.