114 lines
3.5 KiB
Rust
114 lines
3.5 KiB
Rust
use std::env::var;
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use std::io::Write;
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fn main() {
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// I/O safety is stabilized in Rust 1.63.
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if has_io_safety() {
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use_feature("io_safety_is_in_std")
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}
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// Work around
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// https://github.com/rust-lang/rust/issues/103306.
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use_feature_or_nothing("wasi_ext");
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// Rust 1.56 and earlier don't support panic in const fn.
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if has_panic_in_const_fn() {
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use_feature("panic_in_const_fn")
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}
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// Don't rerun this on changes other than build.rs, as we only depend on
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// the rustc version.
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println!("cargo:rerun-if-changed=build.rs");
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}
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fn use_feature_or_nothing(feature: &str) {
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if has_feature(feature) {
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use_feature(feature);
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}
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}
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fn use_feature(feature: &str) {
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println!("cargo:rustc-cfg={}", feature);
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}
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/// Test whether the rustc at `var("RUSTC")` supports the given feature.
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fn has_feature(feature: &str) -> bool {
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let out_dir = var("OUT_DIR").unwrap();
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let rustc = var("RUSTC").unwrap();
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let target = var("TARGET").unwrap();
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let mut child = std::process::Command::new(rustc)
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.arg("--crate-type=rlib") // Don't require `main`.
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.arg("--emit=metadata") // Do as little as possible but still parse.
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.arg("--target")
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.arg(target)
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.arg("--out-dir")
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.arg(out_dir) // Put the output somewhere inconsequential.
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.arg("-") // Read from stdin.
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.stdin(std::process::Stdio::piped()) // Stdin is a pipe.
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.spawn()
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.unwrap();
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writeln!(child.stdin.take().unwrap(), "#![feature({})]", feature).unwrap();
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child.wait().unwrap().success()
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}
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/// Test whether the rustc at `var("RUSTC")` supports panic in `const fn`.
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fn has_panic_in_const_fn() -> bool {
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let out_dir = var("OUT_DIR").unwrap();
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let rustc = var("RUSTC").unwrap();
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let target = var("TARGET").unwrap();
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let mut child = std::process::Command::new(rustc)
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.arg("--crate-type=rlib") // Don't require `main`.
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.arg("--emit=metadata") // Do as little as possible but still parse.
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.arg("--target")
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.arg(target)
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.arg("--out-dir")
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.arg(out_dir) // Put the output somewhere inconsequential.
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.arg("-") // Read from stdin.
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.stdin(std::process::Stdio::piped()) // Stdin is a pipe.
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.spawn()
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.unwrap();
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writeln!(child.stdin.take().unwrap(), "const fn foo() {{ panic!() }}").unwrap();
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child.wait().unwrap().success()
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}
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/// Test whether the rustc at `var("RUSTC")` supports the I/O safety feature.
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fn has_io_safety() -> bool {
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let out_dir = var("OUT_DIR").unwrap();
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let rustc = var("RUSTC").unwrap();
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let target = var("TARGET").unwrap();
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let mut child = std::process::Command::new(rustc)
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.arg("--crate-type=rlib") // Don't require `main`.
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.arg("--emit=metadata") // Do as little as possible but still parse.
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.arg("--target")
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.arg(target)
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.arg("--out-dir")
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.arg(out_dir) // Put the output somewhere inconsequential.
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.arg("-") // Read from stdin.
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.stdin(std::process::Stdio::piped()) // Stdin is a pipe.
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.spawn()
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.unwrap();
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writeln!(
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child.stdin.take().unwrap(),
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"\
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#[cfg(unix)]\n\
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use std::os::unix::io::OwnedFd as Owned;\n\
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#[cfg(target_os = \"wasi\")]\n\
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use std::os::wasi::io::OwnedFd as Owned;\n\
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#[cfg(windows)]\n\
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use std::os::windows::io::OwnedHandle as Owned;\n\
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\n\
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pub type Success = Owned;\n\
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"
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)
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.unwrap();
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child.wait().unwrap().success()
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}
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