How to pass rustflags to artifact dependency binary? - rust

Question

I want to find a way to pass rustflags to artifact dependency bin.
Below is the story.
I write my toy OS currently, and using artifact dependency because this is suggested at rust-osdev/bootloader repositiory(descriptions are Booting section of this README) and I thought this is a useful way. However, I find that this way seems not to pass rustflags I attached in .cargo/config.toml in my kernel workspace like below.
[build]
target = "x86_64-unknown-none"
rustflags = ["-C", "relocation-model=static", "-C", "link-arg=-no-pie"]
[unstable]
build-std = ["core", "compiler_builtins"]
build-std-features = ["compiler-builtins-mem"]
In above config, I expect that kernel elf type is EXEC, but actually, that type is DYN, i.e. I got PIE Elf file even though I write static and no pie flags.
I tried some patterns like below.
run cargo build directly in kernel workspace directory
set invalid rustflags like link-args=hoge and run cargo build in root project directory
As a result
non pie elf (Elf type is EXEC) is created with no errors.
no errors appeared while compile even if I run cargo clean before build.
That's why, I suspect the rustflags I wrote in .cargo/config.toml does not work when its workspace is treated as binary artifact dependency.
Reproduction code is here.
If there is a way to pass rustflags, please teach me.

Answer 1

Add your build.rs in workspace, <project root path>/<kernel workspace name>/build.rs in my case, and put script like below in it.
fn main() {
println!("cargo:rust-link-arg=-no-pie");
}