this post was submitted on 23 Jan 2025
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Auto debloat unused pub items from dependencies. (self.rust)
submitted 6 months ago* (last edited 6 months ago) by Doods to c/rust@programming.dev
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I shaved off 10 MiB from my binary in 2 hours!

I made a program using Macroquad, then I built it in release mode, the binary was 63 MiB in size.

So I used cargo vendor to have a better look at Macroquad and one of its dependencies, glam.

I then started to delete code, like, lots and lots of code(about 30_000 lines of code); none of it affected my main project, some of it became 'dead_code' just by removing the pub keyword.

The result is that my project was unaffected and the binary went down to 52 MiB.

Is there a way to automate removal of unneeded elements from dependencies? This is potentially huge.

EDIT: I FIGURED IT OUT!!!

My mistake was measuring the size of "target/release", I discovered that that folder contains many "unnecessary" files, like "deps", which greatly bloat the folder'r size, the actual size of my binary is 864K.

I am so relieved.

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[โ€“] KillTheMule@programming.dev 9 points 6 months ago (7 children)

Actually, dead code eliminination should do the trick, if you're compiling a binary at least (same for a library I think, but there could be re-exports there). Did you compile in release mode?

[โ€“] Doods 1 points 6 months ago

Yes I compiled in release mode, but manually removing pub function from dependencies was beneficial for some reason, I really don't want to have to do that.

My release profile:

[profile.release]
opt-level = 3
codegen-units = 1
panic = "abort"
strip = true
lto = true
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