servo/ports/servoshell/build.rs

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */

use std::error::Error;
use std::fs::File;
use std::io::Write;
use std::path::Path;
use std::process::Command;

fn git_sha() -> Result<String, String> {
    let output = Command::new("git")
        .args(["rev-parse", "--short", "HEAD"])
        // on macos mach sets DYLD_LIBRARY_PATH since it is needed for unit-tests, but it
        // causes git to fail, so we remove it for the git invocation.
        .env_remove("DYLD_LIBRARY_PATH")
        .output()
        .map_err(|e| e.to_string())?;
    if output.status.success() {
        let hash = String::from_utf8(output.stdout).map_err(|e| e.to_string())?;
        Ok(hash.trim().to_owned())
    } else {
        let stderr = String::from_utf8(output.stderr).map_err(|e| e.to_string())?;
        Err(stderr)
    }
}

fn main() -> Result<(), Box<dyn Error>> {
    println!("cargo::rustc-check-cfg=cfg(servo_production)");
    println!("cargo::rustc-check-cfg=cfg(servo_do_not_use_in_production)");
    // Cargo does not expose the profile name to crates or their build scripts,
    // but we can extract it from OUT_DIR and set a custom cfg() ourselves.
    let out = std::env::var("OUT_DIR")?;
    let out = Path::new(&out);
    let krate = out.parent().unwrap();
    let build = krate.parent().unwrap();
    let profile = build
        .parent()
        .unwrap()
        .file_name()
        .unwrap()
        .to_string_lossy();
    if profile == "production" || profile.starts_with("production-") {
        println!("cargo:rustc-cfg=servo_production");
    } else {
        println!("cargo:rustc-cfg=servo_do_not_use_in_production");
    }

    // Note: We can't use `#[cfg(windows)]`, since that would check the host platform
    // and not the target platform
    let target_os = std::env::var("CARGO_CFG_TARGET_OS").unwrap();

    if target_os == "windows" {
        #[cfg(windows)]
        {
            let mut res = winres::WindowsResource::new();
            res.set_icon("../../resources/servo.ico");
            res.set_manifest_file("platform/windows/servo.exe.manifest");
            res.compile().unwrap();
        }
        #[cfg(not(windows))]
        panic!("Cross-compiling to windows is currently not supported");
    } else if target_os == "macos" {
        println!("cargo:rerun-if-changed=platform/macos/count_threads.c");
        cc::Build::new()
            .file("platform/macos/count_threads.c")
            .compile("count_threads");
    } else if target_os == "android" {
        // FIXME: We need this workaround since jemalloc-sys still links
        // to libgcc instead of libunwind, but Android NDK 23c and above
        // don't have libgcc. We can't disable jemalloc for Android as
        // in 64-bit aarch builds, the system allocator uses tagged
        // pointers by default which causes the assertions in SM & mozjs
        // to fail. See https://github.com/servo/servo/issues/32175.
        let mut libgcc = File::create(out.join("libgcc.a")).unwrap();
        libgcc.write_all(b"INPUT(-lunwind)").unwrap();
        println!("cargo:rustc-link-search=native={}", out.display());
    }

    match git_sha() {
        Ok(hash) => println!("cargo:rustc-env=GIT_SHA={}", hash),
        Err(error) => {
            println!(
                "cargo:warning=Could not generate git version information: {:?}",
                error
            );
            println!("cargo:rustc-env=GIT_SHA=nogit");
        },
    }

    // On MacOS, all dylib dependencies are shipped along with the binary
    // in the "/lib" directory. Setting the rpath here, allows the dynamic
    // linker to locate them. See `man dyld` for more info.
    if target_os == "macos" {
        println!("cargo:rustc-link-arg=-Wl,-rpath,@executable_path/lib/");
    }
    Ok(())
}