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Add minimal cross-compilation support for Windows and AArch64 Linux #78

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merged 1 commit into from
Sep 27, 2022
Merged

Add minimal cross-compilation support for Windows and AArch64 Linux #78

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125 changes: 72 additions & 53 deletions boring-sys/build.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -141,72 +141,91 @@ const BORING_SSL_PATH: &str = "deps/boringssl";
fn get_boringssl_cmake_config() -> cmake::Config {
let arch = std::env::var("CARGO_CFG_TARGET_ARCH").unwrap();
let os = std::env::var("CARGO_CFG_TARGET_OS").unwrap();
let host = std::env::var("HOST").unwrap();
let target = std::env::var("TARGET").unwrap();
let pwd = std::env::current_dir().unwrap();

let mut boringssl_cmake = cmake::Config::new(BORING_SSL_PATH);

// Add platform-specific parameters.
match os.as_ref() {
"android" => {
// We need ANDROID_NDK_HOME to be set properly.
println!("cargo:rerun-if-env-changed=ANDROID_NDK_HOME");
let android_ndk_home = std::env::var("ANDROID_NDK_HOME")
.expect("Please set ANDROID_NDK_HOME for Android build");
let android_ndk_home = std::path::Path::new(&android_ndk_home);
for (name, value) in cmake_params_android() {
eprintln!("android arch={} add {}={}", arch, name, value);
boringssl_cmake.define(name, value);
}
let toolchain_file = android_ndk_home.join("build/cmake/android.toolchain.cmake");
let toolchain_file = toolchain_file.to_str().unwrap();
eprintln!("android toolchain={}", toolchain_file);
boringssl_cmake.define("CMAKE_TOOLCHAIN_FILE", toolchain_file);

// 21 is the minimum level tested. You can give higher value.
boringssl_cmake.define("ANDROID_NATIVE_API_LEVEL", "21");
boringssl_cmake.define("ANDROID_STL", "c++_shared");

boringssl_cmake
}

"ios" => {
for (name, value) in cmake_params_ios() {
eprintln!("ios arch={} add {}={}", arch, name, value);
boringssl_cmake.define(name, value);
if host != target {
// Add platform-specific parameters for cross-compilation.
match os.as_ref() {
"android" => {
// We need ANDROID_NDK_HOME to be set properly.
println!("cargo:rerun-if-env-changed=ANDROID_NDK_HOME");
let android_ndk_home = std::env::var("ANDROID_NDK_HOME")
.expect("Please set ANDROID_NDK_HOME for Android build");
let android_ndk_home = std::path::Path::new(&android_ndk_home);
for (name, value) in cmake_params_android() {
eprintln!("android arch={} add {}={}", arch, name, value);
boringssl_cmake.define(name, value);
}
let toolchain_file = android_ndk_home.join("build/cmake/android.toolchain.cmake");
let toolchain_file = toolchain_file.to_str().unwrap();
eprintln!("android toolchain={}", toolchain_file);
boringssl_cmake.define("CMAKE_TOOLCHAIN_FILE", toolchain_file);

// 21 is the minimum level tested. You can give higher value.
boringssl_cmake.define("ANDROID_NATIVE_API_LEVEL", "21");
boringssl_cmake.define("ANDROID_STL", "c++_shared");
}

// Bitcode is always on.
let bitcode_cflag = "-fembed-bitcode";

// Hack for Xcode 10.1.
let target_cflag = if arch == "x86_64" {
"-target x86_64-apple-ios-simulator"
} else {
""
};
"ios" => {
for (name, value) in cmake_params_ios() {
eprintln!("ios arch={} add {}={}", arch, name, value);
boringssl_cmake.define(name, value);
}

let cflag = format!("{} {}", bitcode_cflag, target_cflag);
// Bitcode is always on.
let bitcode_cflag = "-fembed-bitcode";

boringssl_cmake.define("CMAKE_ASM_FLAGS", &cflag);
boringssl_cmake.cflag(&cflag);
// Hack for Xcode 10.1.
let target_cflag = if arch == "x86_64" {
"-target x86_64-apple-ios-simulator"
} else {
""
};

boringssl_cmake
}
let cflag = format!("{} {}", bitcode_cflag, target_cflag);
boringssl_cmake.define("CMAKE_ASM_FLAGS", &cflag);
boringssl_cmake.cflag(&cflag);
}

_ => {
// Configure BoringSSL for building on 32-bit non-windows platforms.
if arch == "x86" && os != "windows" {
boringssl_cmake.define(
"CMAKE_TOOLCHAIN_FILE",
pwd.join(BORING_SSL_PATH)
.join("src/util/32-bit-toolchain.cmake")
.as_os_str(),
);
"windows" => {
if host.contains("windows") {
// BoringSSL's CMakeLists.txt isn't set up for cross-compiling using Visual Studio.
// Disable assembly support so that it at least builds.
boringssl_cmake.define("OPENSSL_NO_ASM", "YES");
}
}

boringssl_cmake
"linux" => match arch.as_str() {
"x86" => {
boringssl_cmake.define(
"CMAKE_TOOLCHAIN_FILE",
pwd.join(BORING_SSL_PATH)
.join("src/util/32-bit-toolchain.cmake")
.as_os_str(),
);
}
"aarch64" => {
boringssl_cmake.define(
"CMAKE_TOOLCHAIN_FILE",
pwd.join("cmake/aarch64-linux.cmake").as_os_str(),
);
}
_ => {
eprintln!(
"warning: no toolchain file configured by boring-sys for {}",
target
);
}
},

_ => {}
}
}

boringssl_cmake
}

/// Verify that the toolchains match https://csrc.nist.gov/CSRC/media/projects/cryptographic-module-validation-program/documents/security-policies/140sp3678.pdf
Expand Down
3 changes: 3 additions & 0 deletions boring-sys/cmake/aarch64-linux.cmake
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSTEM_PROCESSOR aarch64)
# Rely on environment variables to set the compiler and include paths.