Cross-compile Servo from Linux to OS X

servo-cross-mac

#!/bin/bash
#TODO: you will need to manually get an OS X SDK.

set -e

# Install the proper Rust nightly with rustup, and add the OSX target.
rustup install nightly-`cat rust-nightly-date`
rustup override add nightly-`cat rust-nightly-date`
rustup target install x86_64-apple-darwin

# Configure Servo to use system rust.
cat > .servobuild <<EOF
[tools]
system-rust = true
system-cargo = true
rustc-with-gold = false

[build]
mode = "dev"
EOF

# Get a cross-toolchain.
# This is the toolchain Firefox cross-mac builds use.
mkdir -p toolchain
cd toolchain
curl https://raw.githubusercontent.com/mozilla/build-tooltool/master/tooltool.py > tooltool.py
curl https://hg.mozilla.org/mozilla-central/raw-file/default/browser/config/tooltool-manifests/macosx64/cross-releng.manifest > cross-releng.manifest
python tooltool.py -m cross-releng.manifest fetch cctools.tar.gz clang.tar.xz

# The clang from tooltool needs this.
export LD_LIBRARY_PATH=`pwd`/clang/lib

# Create wrapper scripts for clang/clang++
# If cargo would accept linker arguments in .cargo/config this wouldn't
# be necessary.

cat > mac-cc <<EOF
#!/bin/sh
exec ${PWD}/clang/bin/clang -mmacosx-version-min=10.7 -target x86_64-apple-darwin10 -mlinker-version=136 -B ${PWD}/cctools/bin -isysroot ${PWD}/MacOSX10.7.sdk \$*
EOF

cat > mac-c++ <<EOF
#!/bin/sh
exec ${PWD}/clang/bin/clang++ -mmacosx-version-min=10.7 -target x86_64-apple-darwin10 -mlinker-version=136 -B ${PWD}/cctools/bin -isysroot ${PWD}/MacOSX10.7.sdk \$*
EOF

chmod +x mac-cc mac-c++
export PATH=$PATH:`pwd`

echo "Copy an OS X 10.7 SDK to ${PWD}/MacOSX10.7.sdk, then press ENTER."
read
if test ! -d "${PWD}/MacOSX10.7.sdk"; then
  echo "Didn't find an SDK at ${PWD}/MacOSX10.7.sdk"
  exit 1
fi

cd ..

# Point cargo at the cross-toolchain.
cat > .cargo/config <<EOF
[target.x86_64-apple-darwin]
linker = "${PWD}/toolchain/mac-cc"
ar = "${PWD}/toolchain/cctools/bin/x86_64-apple-darwin10-ar"
EOF

# Create a cmake toolchain for some build deps to use.
cat > cmake-toolchain <<EOF
set( CMAKE_AR "${PWD}/toolchain/cctools/bin/x86_64-apple-darwin10-ar" CACHE PATH "archive" )
set( CMAKE_RANLIB "${PWD}/toolchain/cctools/bin/x86_64-apple-darwin10-ranlib" CACHE PATH "archive" )
EOF

# Build it.
HOST_CC=gcc HOST_CXX=g++ \
CC=mac-cc CXX=mac-c++ CPP="mac-cc -E" \
AR="${PWD}/toolchain/cctools/bin/x86_64-apple-darwin10-ar" \
RANLIB="${PWD}/toolchain/cctools/bin/x86_64-apple-darwin10-ranlib" \
TOOLCHAIN_PREFIX="${PWD}/toolchain/cctools/bin/x86_64-apple-darwin10-" \
CMAKE_TOOLCHAIN_FILE="${PWD}/cmake-toolchain" \
./mach build --target x86_64-apple-darwin