Yi Kong | d600cb0 | 2020-08-31 01:25:28 +0800 | [diff] [blame] | 1 | use std::env; |
Chih-Hung Hsieh | b93bfcb | 2020-10-26 13:16:59 -0700 | [diff] [blame] | 2 | use std::process::Command; |
| 3 | use std::str::{self, FromStr}; |
Yi Kong | d600cb0 | 2020-08-31 01:25:28 +0800 | [diff] [blame] | 4 | |
| 5 | fn main() { |
| 6 | // Decide ideal limb width for arithmetic in the float parser. Refer to |
| 7 | // src/lexical/math.rs for where this has an effect. |
| 8 | let target_arch = env::var("CARGO_CFG_TARGET_ARCH").unwrap(); |
| 9 | match target_arch.as_str() { |
| 10 | "aarch64" | "mips64" | "powerpc64" | "x86_64" => { |
| 11 | println!("cargo:rustc-cfg=limb_width_64"); |
| 12 | } |
| 13 | _ => { |
| 14 | println!("cargo:rustc-cfg=limb_width_32"); |
| 15 | } |
| 16 | } |
Chih-Hung Hsieh | b93bfcb | 2020-10-26 13:16:59 -0700 | [diff] [blame] | 17 | |
| 18 | let minor = match rustc_minor_version() { |
| 19 | Some(minor) => minor, |
| 20 | None => return, |
| 21 | }; |
| 22 | |
| 23 | // BTreeMap::get_key_value |
| 24 | // https://blog.rust-lang.org/2019/12/19/Rust-1.40.0.html#additions-to-the-standard-library |
| 25 | if minor < 40 { |
| 26 | println!("cargo:rustc-cfg=no_btreemap_get_key_value"); |
| 27 | } |
| 28 | |
| 29 | // BTreeMap::remove_entry |
| 30 | // https://blog.rust-lang.org/2020/07/16/Rust-1.45.0.html#library-changes |
| 31 | if minor < 45 { |
| 32 | println!("cargo:rustc-cfg=no_btreemap_remove_entry"); |
| 33 | } |
David LeGare | 2f2c465 | 2022-03-02 16:21:22 +0000 | [diff] [blame^] | 34 | |
| 35 | // BTreeMap::retain |
| 36 | // https://blog.rust-lang.org/2021/06/17/Rust-1.53.0.html#stabilized-apis |
| 37 | if minor < 53 { |
| 38 | println!("cargo:rustc-cfg=no_btreemap_retain"); |
| 39 | } |
Chih-Hung Hsieh | b93bfcb | 2020-10-26 13:16:59 -0700 | [diff] [blame] | 40 | } |
| 41 | |
| 42 | fn rustc_minor_version() -> Option<u32> { |
| 43 | let rustc = env::var_os("RUSTC")?; |
| 44 | let output = Command::new(rustc).arg("--version").output().ok()?; |
| 45 | let version = str::from_utf8(&output.stdout).ok()?; |
| 46 | let mut pieces = version.split('.'); |
| 47 | if pieces.next() != Some("rustc 1") { |
| 48 | return None; |
| 49 | } |
| 50 | let next = pieces.next()?; |
| 51 | u32::from_str(next).ok() |
Yi Kong | d600cb0 | 2020-08-31 01:25:28 +0800 | [diff] [blame] | 52 | } |