號你可以通過欺騙船貨流入告訴你他們中的一些。如果將以下爲build script:
use std::env;
fn main() {
for (key, value) in env::vars() {
if key.starts_with("CARGO_CFG_") {
println!("{}: {:?}", key, value);
}
}
panic!("stop and dump stdout");
}
...這將顯示cfg
標誌貨物是知道的。 panic!
只是一個讓Cargo實際顯示輸出而不是隱藏它的簡單方法。作爲參考,這將產生輸出看起來是這樣的:
Compiling dump-cfg v0.1.0 (file:///F:/Programming/Rust/sandbox/cargo-test/dump-cfg)
error: failed to run custom build command for `dump-cfg v0.1.0 (file:///F:/Programming/Rust/sandbox/cargo-test/dump-cfg)`
process didn't exit successfully: `F:\Programming\Rust\sandbox\cargo-test\dump-cfg\target\debug\build\dump-cfg-8b04f9ac3818f82a\build-script-build` (exit code: 101)
--- stdout
CARGO_CFG_TARGET_POINTER_WIDTH: "64"
CARGO_CFG_TARGET_ENV: "msvc"
CARGO_CFG_TARGET_OS: "windows"
CARGO_CFG_TARGET_ENDIAN: "little"
CARGO_CFG_TARGET_FAMILY: "windows"
CARGO_CFG_TARGET_ARCH: "x86_64"
CARGO_CFG_TARGET_HAS_ATOMIC: "16,32,64,8,ptr"
CARGO_CFG_TARGET_FEATURE: "sse,sse2"
CARGO_CFG_WINDOWS: ""
CARGO_CFG_TARGET_VENDOR: "pc"
CARGO_CFG_DEBUG_ASSERTIONS: ""
--- stderr
thread 'main' panicked at 'stop', build.rs:9
note: Run with `RUST_BACKTRACE=1` for a backtrace.
您可以提取你想從這個列表中的值,並將其轉儲到一個生成的源文件,然後可以導入(使用#[path]
或include!
)放入包裝的來源。
您可能會發現此問題相關:https://github.com/rust-lang/rust/issues/48823 –