sgx_urts/build.rs

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// to you under the Apache License, Version 2.0 (the
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// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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// under the License..

use std::env;

fn main() -> Result<(), &'static str> {
    println!("cargo:rerun-if-env-changed=SGX_MODE");
    println!("cargo:rerun-if-changed=build.rs");

    if cfg!(all(feature = "sim", feature = "hyper")) {
        println!("cargo:warning=feature \"sim\" and feature \"hyper\", only one or neither of them can be enabled.");
        return Err("Defined feature is illegal.");
    }

    let mode = env::var("SGX_MODE").unwrap_or_else(|_| "HW".to_string());
    match mode.as_ref() {
        "SIM" | "SW" => println!("cargo:rustc-cfg=feature=\"sim\""),
        "HYPER" => println!("cargo:rustc-cfg=feature=\"hyper\""),
        _ => (),
    }
    Ok(())
}