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RustをmacOS上でLinuxのバイナリにクロスコンパイルする

Last updated at 2023-03-09Posted at 2023-03-07

この記事ではmacOS上でRustをLinuxのバイナリにクロスコンパイルする方法を説明します。

まずx86_64-unknown-linux-gnuパッケージをbrewでインストールします。

brew install SergioBenitez/osxct/x86_64-unknown-linux-gnu

aarch64の場合はこっち

brew tap messense/macos-cross-toolchains
brew install aarch64-unknown-linux-gnu

つぎにrustにtargetを追加します。

rustup target add x86_64-unknown-linux-gnu

# aarch64
rustup target add aarch64-unknown-linux-gnu

そして ~/.cargo/config.toml`にlinkerの設定を追加します。

~/.cargo/config.toml

[target.x86_64-unknown-linux-gnu]
linker = "x86_64-unknown-linux-gnu-gcc"

# aarch64
# [target.aarch64-unknown-linux-gnu]
# linker = "aarch64-unknown-linux-gnu-gcc"

OpenSSLライブラリの設定

適当なディレクトリを作ります。

mkdir ~/rust/lib && cd ~/rust/lib

OpenSSLライブラリを取得して展開します。

curl -O https://debian.sipwise.com/debian-security/pool/main/o/openssl/libssl-dev_1.1.1d-0+deb10u6_amd64.deb
ar p libssl-dev_1.1.1d-0+deb10u6_amd64.deb data.tar.xz | tar xvf -
rm -rf libssl-dev_1.1.1d-0+deb10u6_amd64.deb

Aarch64の場合はこっち

curl -O https://debian.ignum.cz/debian-security/pool/main/o/openssl/libssl-dev_1.1.1d-0+deb10u6_arm64.deb
ar p libssl-dev_1.1.1d-0+deb10u6_arm64.deb data.tar.xz | tar xvf -
rm -rf libssl-dev_1.1.1d-0+deb10u6_arm64.deb

ビルド用環境変数の設定

export LIB_OPENSSL_DIR=~/rust/lib

# Linker for the target platform
# (cc can also be updated using .cargo/config)
export TARGET_CC="x86_64-unknown-linux-gnu-gcc"

# Library headers to link against
export TARGET_CFLAGS="-I ${LIB_OPENSSL_DIR}/usr/include/x86_64-linux-gnu -isystem ${LIB_OPENSSL_DIR}/usr/include"
# Libraries (shared objects) to link against
export LD_LIBRARY_PATH="${LIB_OPENSSL_DIR}/usr/lib/x86_64-linux-gnu;${LIB_OPENSSL_DIR}/lib/x86_64-linux-gnu"

# openssl-sys specific build flags
export OPENSSL_DIR="${LIB_OPENSSL_DIR}/usr/"
export OPENSSL_LIB_DIR="${LIB_OPENSSL_DIR}/usr/lib/x86_64-linux-gnu/"

# Aarch64
#!/bin/sh

export LIB_OPENSSL_DIR=$(pwd)/build

# Linker for the target platform
# (cc can also be updated using .cargo/config)
export TARGET_CC="aarch64-unknown-linux-gnu-gcc"

# Library headers to link against
export TARGET_CFLAGS="-I ${LIB_OPENSSL_DIR}/usr/include/aarch64-linux-gnu -isystem ${LIB_OPENSSL_DIR}/usr/include"
# Libraries (shared objects) to link against
export LD_LIBRARY_PATH="${LIB_OPENSSL_DIR}/usr/lib/aarch64-linux-gnu;${LIB_OPENSSL_DIR}/lib/aarch64-linux-gnu"

# openssl-sys specific build flags
export OPENSSL_DIR="${LIB_OPENSSL_DIR}/usr/"
export OPENSSL_LIB_DIR="${LIB_OPENSSL_DIR}/usr/lib/aarch64-linux-gnu/"

export CC_Aarch64_unknown_linux_gnu=aarch64-unknown-linux-gnu-gcc
export CXX_Aarch64_unknown_linux_gnu=aarch64-unknown-linux-gnu-g++
export AR_Aarch64_unknown_linux_gnu=aarch64-unknown-linux-gnu-ar
export CARGO_TARGET_Aarch64_UNKNOWN_LINUX_GNU_LINKER=aarch64-unknown-linux-gnu-gcc

ビルド

最後にビルドを実行します。

cargo build --target=x86_64-unknown-linux-gnu

# aarch64
cargo build --target=aarch64-unknown-linux-gnu

コンパイル結果

下記ディレクトリにバイナリが出力されています。

target/x86_64-unknown-linux-gnu/debug/hoge

# aarch64
target/aarch64-unknown-linux-gnu/debug/hoge

fileコマンドでちゃんとELFになっているか確認してみます。

file target/x86_64-unknown-linux-gnu/debug/hoge

# aarch64
file target/aarch64-unknown-linux-gnu/debug/hoge

target/x86_64-unknown-linux-gnu/debug/h: ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 3.2.0, with debug_info, not stripped

なってますね!!😄

参考

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