Build universal (x86_64 + arm64) x264 libraries on an intel x86 Mac

build_universal.sh

#!/bin/bash
#
# build-universal.sh
#
# Compile a universal x264 binary on OS X (intel).
#
# Requires nasm.  Install with homebrew: 'brew install nasm'
#

CONFIGURE_OPTS='--enable-shared --enable-static'
X86_64_TARGET='-target x86_64-apple-macos10.12'
X86_64_HOST='x86_64-apple-darwin10'
ARM64_TARGET='--target=arm64-apple-macos'
ARM64_HOST='arm64-apple-darwin20.3.0'

LIB_DIR='/usr/local/lib'
OUTPUT_FILES='libx264.a libx264.dylib'

rm -rf x86_64 arm64

# Compile x86_64 first
make clean && ./configure ${CONFIGURE_OPTS} --host="${X86_64_HOST}" --extra-cflags="${X86_64_TARGET}" && make && DESTDIR=x86_64/ make install

# Compile arm64
make clean && ./configure ${CONFIGURE_OPTS} --host="${ARM64_HOST}" --extra-cflags="${ARM64_TARGET}" --extra-asflags="${ARM64_TARGET}" --extra-ldflags="${ARM64_TARGET}" && make && DESTDIR=arm64/ make install

# Create a universal binary
rm -r universal/
mkdir -p universal/${LIB_DIR}
echo "Output Files Placed in universal/"
for FILE in ${OUTPUT_FILES}; do
  echo ${FILE}
  lipo -create -output universal/${LIB_DIR}/${FILE} x86_64/${LIB_DIR}/${FILE} arm64/${LIB_DIR}/${FILE}
  lipo -archs universal/${LIB_DIR}/${FILE}
done