src/rust/cryptography-key-parsing/build.rs

// This file is dual licensed under the terms of the Apache License, Version
// 2.0, and the BSD License. See the LICENSE file in the root of this repository
// for complete details.

use std::env;

#[allow(clippy::unusual_byte_groupings)]
fn main() {
    // Without any rerun-if directives cargo reruns the build script (and
    // recompiles the crate) whenever any mtime in the package changes,
    // which defeats CI build caching. Everything below depends only on
    // this file and metadata from openssl-sys (which cargo tracks as a
    // dependency on its own).
    println!("cargo:rerun-if-changed=build.rs");

    if env::var("DEP_OPENSSL_LIBRESSL_VERSION_NUMBER").is_ok() {
        println!("cargo:rustc-cfg=CRYPTOGRAPHY_IS_LIBRESSL");
    }

    if env::var("DEP_OPENSSL_BORINGSSL").is_ok() {
        println!("cargo:rustc-cfg=CRYPTOGRAPHY_IS_BORINGSSL");
    }

    if env::var("DEP_OPENSSL_AWSLC").is_ok() {
        println!("cargo:rustc-cfg=CRYPTOGRAPHY_IS_AWSLC");
    }

    if let Ok(version) = env::var("DEP_OPENSSL_VERSION_NUMBER") {
        let version = u64::from_str_radix(&version, 16).unwrap();
        if version >= 0x3_05_00_00_0 {
            println!("cargo:rustc-cfg=CRYPTOGRAPHY_OPENSSL_350_OR_GREATER");
        }
    }

    if let Ok(vars) = env::var("DEP_OPENSSL_CONF") {
        for var in vars.split(',') {
            println!("cargo:rustc-cfg=CRYPTOGRAPHY_OSSLCONF=\"{var}\"");
        }
    }
}