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Fix build.rs to support cross-compiling to cygwin (#11512)

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2719ae4 adds a special cfg for cygwin to avoid annoying warnings. As cygwin target is usually cross-compiled, cfg! is not enough to detect the correct target. This PR uses CARGO_CFG_TARGET_OS env var instead.
This commit is contained in:
Yuyi Wang
2025-05-19 16:27:04 +08:00
committed by GitHub
parent 01560bf195
commit 223b98f2ff
1 changed files with 2 additions and 2 deletions
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4
build.rs
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@@ -143,9 +143,9 @@ fn detect_apple(_: &Target) -> Result<bool, Box<dyn Error>> {
Ok(cfg!(any(target_os = "ios", target_os = "macos")))
}
#[allow(unexpected_cfgs)]
fn detect_cygwin(_: &Target) -> Result<bool, Box<dyn Error>> {
Ok(cfg!(target_os = "cygwin"))
// Cygwin target is usually cross-compiled.
Ok(std::env::var("CARGO_CFG_TARGET_OS").unwrap() == "cygwin")
}
/// Detect if we're being compiled for a BSD-derived OS, allowing targeting code conditionally with