Rust OpenSSL Cross Compile for Linux on Mac M1

rust-cross-compile-openssl.md

Install the toolchain

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

this should get installed in:

/opt/homebrew/Cellar/x86_64-unknown-linux-gnu/

Installing the macOS OpenSSL - if not already installed

brew install openssl@1.1

this should get installed in:

/opt/homebrew/Cellar/openssl@1.1/

Download the OpenSSL Source

cd /tmp
wget https://www.openssl.org/source/openssl-1.1.1s.tar.gz
tar xvf openssl-1.1.1s.tar.gz
cd openssl-1.1.1s

Configure for Intel x86_64

CC="x86_64-unknown-linux-gnu-gcc -fPIE -pie" \
CXX="x86_64-unknown-linux-gnu-g++" \
AS="x86_64-unknown-linux-gnu-as" \
AR="x86_64-unknown-linux-gnu-ar" \
NM="x86_64-unknown-linux-gnu-nm" \
RANLIB="x86_64-unknown-linux-gnu-gcc-ranlib" \
LD="x86_64-unknown-linux-gnu-ld" \
STRIP="x86_64-unknown-linux-gnu-strip" \
./Configure linux-x86_64 no-shared no-async --prefix=/opt/homebrew/Cellar/openssl\@1.1/1.1.1s/x86_64-linux-gnu  --openssldir=/opt/homebrew/Cellar/openssl\@1.1/1.1.1s/x86_64-linux-gnu

Configure for aarch64

CC="aarch64-unknown-linux-gnu-gcc -fPIE -pie" \
CXX="aarch64-unknown-linux-gnu-g++" \
AS="aarch64-unknown-linux-gnu-as" \
AR="aarch64-unknown-linux-gnu-ar" \
NM="aarch64-unknown-linux-gnu-nm" \
RANLIB="aarch64-unknown-linux-gnu-gcc-ranlib" \
LD="aarch64-unknown-linux-gnu-ld" \
STRIP="aarch64-unknown-linux-gnu-strip" \
./Configure linux-aarch64 no-shared no-async --prefix=/opt/homebrew/Cellar/openssl\@1.1/1.1.1s/aarch64-linux-gnu  --openssldir=/opt/homebrew/Cellar/openssl\@1.1/1.1.1s/aarch64-linux-gnu

Make

make -j12

Install

make install

Now you should have a linux x86_64 version of openssl installed in:

/opt/homebrew/Cellar/openssl@1.1/1.1.1n/x86_64-linux-gnu

OR for aarch 64

/opt/homebrew/Cellar/openssl@1.1/1.1.1n/aarch64-linux-gnu

Rust Cross compile in Mac for linux

Now if you want to cross compile for linux on your mac m1 using rust with openssl or openss-sys

Cargo.toml - as much as possible try to use "vendored" feature in openssl - that way the openssl will not become

a dependancy on the target system

OPENSSL_INCLUDE_DIR=`brew --prefix openssl@1.1`/x86_64-linux-gnu/include OPENSSL_LIB_DIR=`brew --prefix openssl@1.1`/x86_64-linux-gnu/lib  OPENSSL_STATIC=1 cargo b --release --target x86_64-unknown-linux-gnu

for aarch64

OPENSSL_INCLUDE_DIR=`brew --prefix openssl@1.1`/aarch64-linux-gnu/include OPENSSL_LIB_DIR=`brew --prefix openssl@1.1`/aarch64-linux-gnu/lib  OPENSSL_STATIC=1 cargo b --release --target aarch64-unknown-linux-gnu

if you want to strip the executable:

x86_64-unknown-linux-gnu-strip target/release/<file>

for aarch64

aarch64-unknown-linux-gnu-strip target/release/<file>