26 lines
673 B
Rust
26 lines
673 B
Rust
#![feature(asm)]
|
|
|
|
use std::env;
|
|
|
|
#[cfg(miri)]
|
|
compile_error!("`miri` cfg should not be set in build script");
|
|
|
|
fn not_in_miri() -> i32 {
|
|
// Inline assembly definitely does not work in Miri.
|
|
let mut dummy = 42;
|
|
unsafe {
|
|
asm!("/* {} */", in(reg) &mut dummy);
|
|
}
|
|
return dummy;
|
|
}
|
|
|
|
fn main() {
|
|
not_in_miri();
|
|
// Cargo calls `miri --print=cfg` to populate the `CARGO_CFG_*` env vars.
|
|
// Make sure that the "miri" flag is set.
|
|
assert!(env::var_os("CARGO_CFG_MIRI").is_some());
|
|
println!("cargo:rerun-if-changed=build.rs");
|
|
println!("cargo:rerun-if-env-changed=MIRITESTVAR");
|
|
println!("cargo:rustc-env=MIRITESTVAR=testval");
|
|
}
|