FilesExpand file tree

main

/

build.rs

Copy path

Blame

More file actions

Blame

More file actions

Latest commit

 

History

History

History

32 lines (31 loc) · 1.23 KB

main

/

build.rs

Copy path

Top

File metadata and controls

• Code
• Blame

32 lines (31 loc) · 1.23 KB

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

//! Link-time size knobs for the shipping binary.

//!

//! These lived in `.cargo/config.toml` as global `rustflags`. They are scoped

//! to the release binary instead: they only shrink the shipping artifact.

//! Every link uses the toolchain's default rust-lld (the rustc 1.98.1

//! `unknown relocation (1875)` DWARF bug that forced bfd onto dev/test links

//! is gone on the pinned nightly). Nothing unwinds in release (`panic =

//! "abort"` from the profile; QuickJS-ng uses setjmp/longjmp), so

//! `[profile.release] rustflags` disables unwind-table emission outright

//! (`force-unwind-tables=no`): the shipping binary carries no `.eh_frame`

//! bodies beyond the CRT startup objects' 48-byte CIE. No post-link step is

//! left; `cargo build --release` is the shipped artifact.

//!

//! Sizes and method: `docs/size.md`.

fn main() {

println!("cargo:rerun-if-changed=build.rs");

if std::env::var("PROFILE").as_deref() != Ok("release") {

return;

}

for arg in [

"-fuse-ld=lld",

"-Wl,--icf=all",

"-Wl,--build-id=none",

"-Wl,--gc-sections",

"-Wl,-O2",

"-Wl,-z,pack-relative-relocs",

"-Wl,--no-eh-frame-hdr",

] {

println!("cargo:rustc-link-arg-bins={arg}");

}

}