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Add minimal cross-compilation support for Windows and AArch64 Linux 

Cross-compiling to AArch64 Linux can be done with a CMake toolchain
file, along with setting the correct compiler and include paths in the
environment.

Cross-compiling from X64 Windows to ARM64 Windows doesn't look at the
toolchain at all, because CMake + Visual Studio can already
cross-compile. Unfortunately, the Visual Studio CMake generator
doesn't set CMAKE_SYSTEM_PROCESSOR, which is what the BoringSSL
CMakeLists.txt is looking at to choose the architecture. For now,
disable the use of assembly when cross-compiling on Windows (assuming
that the Visual Studio generator will be used there).
This commit is contained in:
Jordan Rose 2022-06-22 13:27:13 -07:00
parent ccc0128cba
commit 3bbb1b94b6
2 changed files with 75 additions and 53 deletions
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125
boring-sys/build.rs
View File

@ -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);
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);
// 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);
// 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";
"ios" => {
for (name, value) in cmake_params_ios() {
eprintln!("ios arch={} add {}={}", arch, name, value);
boringssl_cmake.define(name, value);
}
// Hack for Xcode 10.1.
let target_cflag = if arch == "x86_64" {
"-target x86_64-apple-ios-simulator"
} else {
""
};
// Bitcode is always on.
let bitcode_cflag = "-fembed-bitcode";
let cflag = format!("{} {}", bitcode_cflag, target_cflag);
// Hack for Xcode 10.1.
let target_cflag = if arch == "x86_64" {
"-target x86_64-apple-ios-simulator"
} else {
""
};
boringssl_cmake.define("CMAKE_ASM_FLAGS", &cflag);
boringssl_cmake.cflag(&cflag);
boringssl_cmake
}
_ => {
// 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(),
);
let cflag = format!("{} {}", bitcode_cflag, target_cflag);
boringssl_cmake.define("CMAKE_ASM_FLAGS", &cflag);
boringssl_cmake.cflag(&cflag);
}
boringssl_cmake
"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");
}
}
"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

3
boring-sys/cmake/aarch64-linux.cmake Normal file
View File

@ -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.