141 lines
4.9 KiB
Rust
141 lines
4.9 KiB
Rust
use std::env;
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use std::process::Command;
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use std::str::{self, FromStr};
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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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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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let target = env::var("TARGET").unwrap();
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let emscripten = target == "asmjs-unknown-emscripten" || target == "wasm32-unknown-emscripten";
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// std::collections::Bound was stabilized in Rust 1.17
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// but it was moved to core::ops later in Rust 1.26:
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// https://doc.rust-lang.org/core/ops/enum.Bound.html
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if minor < 26 {
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println!("cargo:rustc-cfg=no_ops_bound");
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if minor < 17 {
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println!("cargo:rustc-cfg=no_collections_bound");
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}
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}
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// core::cmp::Reverse stabilized in Rust 1.19:
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// https://doc.rust-lang.org/stable/core/cmp/struct.Reverse.html
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if minor < 19 {
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println!("cargo:rustc-cfg=no_core_reverse");
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}
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// CString::into_boxed_c_str and PathBuf::into_boxed_path stabilized in Rust 1.20:
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// https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
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// https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.into_boxed_path
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if minor < 20 {
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println!("cargo:rustc-cfg=no_de_boxed_c_str");
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println!("cargo:rustc-cfg=no_de_boxed_path");
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}
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// From<Box<T>> for Rc<T> / Arc<T> stabilized in Rust 1.21:
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// https://doc.rust-lang.org/std/rc/struct.Rc.html#impl-From<Box<T>>
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// https://doc.rust-lang.org/std/sync/struct.Arc.html#impl-From<Box<T>>
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if minor < 21 {
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println!("cargo:rustc-cfg=no_de_rc_dst");
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}
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// Duration available in core since Rust 1.25:
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// https://blog.rust-lang.org/2018/03/29/Rust-1.25.html#library-stabilizations
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if minor < 25 {
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println!("cargo:rustc-cfg=no_core_duration");
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}
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// 128-bit integers stabilized in Rust 1.26:
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// https://blog.rust-lang.org/2018/05/10/Rust-1.26.html
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//
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// Disabled on Emscripten targets before Rust 1.40 since
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// Emscripten did not support 128-bit integers until Rust 1.40
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// (https://github.com/rust-lang/rust/pull/65251)
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if minor < 26 || emscripten && minor < 40 {
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println!("cargo:rustc-cfg=no_integer128");
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}
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// Inclusive ranges methods stabilized in Rust 1.27:
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// https://github.com/rust-lang/rust/pull/50758
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// Also Iterator::try_for_each:
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// https://blog.rust-lang.org/2018/06/21/Rust-1.27.html#library-stabilizations
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if minor < 27 {
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println!("cargo:rustc-cfg=no_range_inclusive");
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println!("cargo:rustc-cfg=no_iterator_try_fold");
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}
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// Non-zero integers stabilized in Rust 1.28:
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// https://blog.rust-lang.org/2018/08/02/Rust-1.28.html#library-stabilizations
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if minor < 28 {
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println!("cargo:rustc-cfg=no_num_nonzero");
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}
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// Current minimum supported version of serde_derive crate is Rust 1.31.
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if minor < 31 {
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println!("cargo:rustc-cfg=no_serde_derive");
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}
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// TryFrom, Atomic types, non-zero signed integers, and SystemTime::checked_add
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// stabilized in Rust 1.34:
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// https://blog.rust-lang.org/2019/04/11/Rust-1.34.0.html#tryfrom-and-tryinto
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// https://blog.rust-lang.org/2019/04/11/Rust-1.34.0.html#library-stabilizations
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if minor < 34 {
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println!("cargo:rustc-cfg=no_core_try_from");
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println!("cargo:rustc-cfg=no_num_nonzero_signed");
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println!("cargo:rustc-cfg=no_systemtime_checked_add");
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}
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// Whitelist of archs that support std::sync::atomic module. Ideally we
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// would use #[cfg(target_has_atomic = "...")] but it is not stable yet.
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// Instead this is based on rustc's compiler/rustc_target/src/spec/*.rs.
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let has_atomic64 = target.starts_with("x86_64")
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|| target.starts_with("i686")
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|| target.starts_with("aarch64")
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|| target.starts_with("powerpc64")
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|| target.starts_with("sparc64")
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|| target.starts_with("mips64el")
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|| target.starts_with("riscv64");
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let has_atomic32 = has_atomic64 || emscripten;
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if minor < 34 || !has_atomic64 {
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println!("cargo:rustc-cfg=no_std_atomic64");
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}
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if minor < 34 || !has_atomic32 {
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println!("cargo:rustc-cfg=no_std_atomic");
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}
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}
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fn rustc_minor_version() -> Option<u32> {
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let rustc = match env::var_os("RUSTC") {
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Some(rustc) => rustc,
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None => return None,
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};
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let output = match Command::new(rustc).arg("--version").output() {
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Ok(output) => output,
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Err(_) => return None,
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};
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let version = match str::from_utf8(&output.stdout) {
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Ok(version) => version,
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Err(_) => return None,
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};
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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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let next = match pieces.next() {
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Some(next) => next,
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None => return None,
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};
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u32::from_str(next).ok()
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}
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