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Support cross-compilation w/ detect_bsd() check

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Also assert that the code works as expected by asserting the result under known
BSD systems.
This commit is contained in:
Mahmoud Al-Qudsi 2023-05-05 18:38:52 -05:00
parent 220ffaeb65
commit 7d617d7d58
1 changed files with 18 additions and 12 deletions
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30
fish-rust/build.rs
View file

@ -1,5 +1,3 @@
use miette::miette;
fn main() -> miette::Result<()> {
cc::Build::new().file("src/compat.c").compile("libcompat.a");
@ -101,25 +99,33 @@ fn detect_features() {
("bsd", &detect_bsd),
] {
match detector() {
Err(e) => eprintln!("{feature} detect: {e}"),
Err(e) => eprintln!("ERROR: {feature} detect: {e}"),
Ok(true) => println!("cargo:rustc-cfg=feature=\"{feature}\""),
Ok(false) => (),
}
}
}
/// Detect if we're being compiled on a BSD-derived OS. Does not yet play nicely with
/// cross-compilation.
/// Detect if we're being compiled for a BSD-derived OS, allowing targeting code conditionally with
/// `#[cfg(feature = "bsd")]`.
///
/// Rust offers fine-grained conditional compilation per-os for the popular operating systems, but
/// doesn't necessarily include less-popular forks nor does it group them into families more
/// specific than "windows" vs "unix" so we can conditionally compile code for BSD systems.
fn detect_bsd() -> miette::Result<bool> {
let uname = std::process::Command::new("uname")
.output()
.map_err(|_| miette!("Error executing uname!"))?;
Ok(std::str::from_utf8(&uname.stdout)
.map(|s| s.to_ascii_lowercase())
.map(|s| s.contains("bsd"))
.unwrap_or(false))
// Instead of using `uname`, we can inspect the TARGET env variable set by Cargo. This lets us
// support cross-compilation scenarios.
let mut target = std::env::var("TARGET").unwrap();
if !target.chars().all(|c| c.is_ascii_lowercase()) {
target = target.to_ascii_lowercase();
}
let result = target.ends_with("bsd") || target.ends_with("dragonfly");
#[cfg(any(
target_os = "dragonfly",
target_os = "freebsd",
target_os = "netbsd",
target_os = "openbsd",
))]
assert!(result, "Target incorrectly detected as not BSD!");
Ok(result)
}