41 lines
1.4 KiB
Rust
41 lines
1.4 KiB
Rust
use std::env;
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#[cfg(miri)]
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compile_error!("`miri` cfg should not be set in build script");
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fn not_in_miri() -> i32 {
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// Inline assembly definitely does not work in Miri.
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let mut dummy = 42;
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unsafe {
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std::arch::asm!("/* {} */", in(reg) &mut dummy);
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}
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return dummy;
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}
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fn main() {
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not_in_miri();
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// Cargo calls `miri --print=cfg` to populate the `CARGO_CFG_*` env vars.
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// Make sure that the "miri" flag is set.
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assert!(env::var_os("CARGO_CFG_MIRI").is_some(), "cargo failed to tell us about `--cfg miri`");
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println!("cargo:rerun-if-changed=build.rs");
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println!("cargo:rerun-if-env-changed=MIRITESTVAR");
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println!("cargo:rustc-env=MIRITESTVAR=testval");
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// Test that autocfg works. This invokes RUSTC.
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let a = autocfg::new();
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assert!(a.probe_sysroot_crate("std"));
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assert!(!a.probe_sysroot_crate("doesnotexist"));
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assert!(a.probe_rustc_version(1, 0));
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assert!(!a.probe_rustc_version(2, 0));
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assert!(a.probe_type("i128"));
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assert!(!a.probe_type("doesnotexist"));
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assert!(a.probe_trait("Send"));
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assert!(!a.probe_trait("doesnotexist"));
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assert!(a.probe_path("std::num"));
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assert!(!a.probe_path("doesnotexist"));
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assert!(a.probe_constant("i32::MAX"));
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assert!(!a.probe_constant("doesnotexist"));
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assert!(a.probe_expression("Box::new(0)"));
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assert!(!a.probe_expression("doesnotexist"));
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}
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