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Rollup merge of #100532 - RalfJung:unwind-miri, r=Mark-Simulacrum

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unwind: don't build dependency when building for Miri

This is basically re-submitting https://github.com/rust-lang/rust/pull/94813.

In that PR there was a suggestion to instead have bootstrap set a `RUST_CHECK` env var and use that rather than doing something Miri-specific. However, such an env var would mean that when switching between `./x.py check` and `./x.py build`, the build script gets re-run each time, which doesn't seem good. So I think for now checking for Miri probably causes fewer problems.

r? ````@Mark-Simulacrum````
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Matthias Krüger 2022-08-17 12:32:53 +02:00 committed by GitHub
commit 56b02b2137
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8
library/unwind/build.rs
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@ -2,8 +2,14 @@ use std::env;
fn main() {
println!("cargo:rerun-if-changed=build.rs");
let target = env::var("TARGET").expect("TARGET was not set");
println!("cargo:rerun-if-env-changed=CARGO_CFG_MIRI");
if env::var_os("CARGO_CFG_MIRI").is_some() {
// Miri doesn't need the linker flags or a libunwind build.
return;
}
let target = env::var("TARGET").expect("TARGET was not set");
if target.contains("android") {
let build = cc::Build::new();