72 lines
2.4 KiB
Rust
72 lines
2.4 KiB
Rust
use std::env;
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use std::fs;
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use std::path::PathBuf;
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use std::process::Command;
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use std::str;
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const PRIVATE: &str = "\
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#[doc(hidden)]
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pub mod __private$$ {
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#[doc(hidden)]
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pub use crate::private::*;
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}
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use serde_core::__private$$ as serde_core_private;
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";
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// The rustc-cfg strings below are *not* public API. Please let us know by
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// opening a GitHub issue if your build environment requires some way to enable
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// these cfgs other than by executing our build script.
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fn main() {
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println!("cargo:rerun-if-changed=build.rs");
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if env::var_os("DOCS_RS").is_some() {
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println!("cargo:rustc-cfg=no_serde_core");
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}
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let out_dir = PathBuf::from(env::var_os("OUT_DIR").unwrap());
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let patch_version = env::var("CARGO_PKG_VERSION_PATCH").unwrap();
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let module = PRIVATE.replace("$$", &patch_version);
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fs::write(out_dir.join("private.rs"), module).unwrap();
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let minor = match rustc_minor_version() {
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Some(minor) => minor,
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None => return,
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};
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if minor >= 77 {
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println!("cargo:rustc-check-cfg=cfg(feature, values(\"result\"))");
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println!("cargo:rustc-check-cfg=cfg(no_core_cstr)");
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println!("cargo:rustc-check-cfg=cfg(no_core_error)");
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println!("cargo:rustc-check-cfg=cfg(no_core_net)");
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println!("cargo:rustc-check-cfg=cfg(no_core_num_saturating)");
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println!("cargo:rustc-check-cfg=cfg(no_diagnostic_namespace)");
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println!("cargo:rustc-check-cfg=cfg(no_serde_core)");
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println!("cargo:rustc-check-cfg=cfg(no_serde_derive)");
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println!("cargo:rustc-check-cfg=cfg(no_std_atomic)");
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println!("cargo:rustc-check-cfg=cfg(no_std_atomic64)");
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println!("cargo:rustc-check-cfg=cfg(no_target_has_atomic)");
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}
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// Current minimum supported version of serde_derive crate is Rust 1.61.
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if minor < 61 {
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println!("cargo:rustc-cfg=no_serde_derive");
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}
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// Support for the `#[diagnostic]` tool attribute namespace
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// https://blog.rust-lang.org/2024/05/02/Rust-1.78.0.html#diagnostic-attributes
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if minor < 78 {
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println!("cargo:rustc-cfg=no_diagnostic_namespace");
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}
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}
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fn rustc_minor_version() -> Option<u32> {
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let rustc = env::var_os("RUSTC")?;
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let output = Command::new(rustc).arg("--version").output().ok()?;
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let version = str::from_utf8(&output.stdout).ok()?;
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let mut pieces = version.split('.');
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if pieces.next() != Some("rustc 1") {
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return None;
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}
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pieces.next()?.parse().ok()
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}
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