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47 lines
1.4 KiB
47 lines
1.4 KiB
use std::env;
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use std::process::Command;
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use std::str::{self, FromStr};
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fn main() {
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// Decide ideal limb width for arithmetic in the float parser. Refer to
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// src/lexical/math.rs for where this has an effect.
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let target_arch = env::var("CARGO_CFG_TARGET_ARCH").unwrap();
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match target_arch.as_str() {
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"aarch64" | "mips64" | "powerpc64" | "x86_64" => {
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println!("cargo:rustc-cfg=limb_width_64");
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}
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_ => {
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println!("cargo:rustc-cfg=limb_width_32");
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}
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}
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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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// BTreeMap::get_key_value
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// https://blog.rust-lang.org/2019/12/19/Rust-1.40.0.html#additions-to-the-standard-library
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if minor < 40 {
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println!("cargo:rustc-cfg=no_btreemap_get_key_value");
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}
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// BTreeMap::remove_entry
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// https://blog.rust-lang.org/2020/07/16/Rust-1.45.0.html#library-changes
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if minor < 45 {
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println!("cargo:rustc-cfg=no_btreemap_remove_entry");
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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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let next = pieces.next()?;
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u32::from_str(next).ok()
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}
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