this post was submitted on 23 Jan 2025
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Auto debloat unused pub items from dependencies. (infosec.pub)
submitted 1 month ago* (last edited 1 month ago) by Doods@infosec.pub 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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[–] Doods@infosec.pub 1 points 1 month ago* (last edited 1 month ago) (4 children)

Yes, I am using both LTO and release mode, I can show you:

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

cargo build --release

[–] sgued@pouet.chapril.org 1 points 1 month ago (3 children)

@Doods I'm surprised you can gain that much with that already enabled!

[–] Doods@infosec.pub 2 points 1 month ago* (last edited 1 month ago) (2 children)

Should I bring it up to the 'min-sized-rust' working group or the forums or something?

[–] TehPers@beehaw.org 4 points 1 month ago (1 children)

Yes. This behavior seems strange, so either an explanation or investigation by a compiler dev seems like it would be helpful.

[–] Doods@infosec.pub 2 points 1 month ago

Just so you know I figured it out, re-read the post please.