Can't build XCFrameworks on intel mac (because of ARM requirements)

[matkatmusic]

I needed to be able to use libsodium in an iOS project that I'm working on, on my intel iMac.

I had to do some heavy edits to the apple-xcframework.sh file to be able to compile the x86-64 iOS Simulator xcframework of the library.

I think I might be helpful to end users if the apple-xcframework.sh file was split into scripts that build each part separately (macos, ios, watchos, tvos, visionos, ios-sim, watchOS-sim, tvOS-sim, visionOS-sim)

Here's the edited script I ended up with that built the x86-64 framework for the IOS-Simulator:

#! /bin/sh

export PREFIX="$(pwd)/libsodium-apple"
export IOS_SIMULATOR_X86_64_PREFIX="${PREFIX}/tmp/ios-simulator-x86_64"
export LOG_FILE="${PREFIX}/tmp/build_log"
export XCODEDIR="$(xcode-select -p)"

export IOS_VERSION_MIN=${IOS_VERSION_MIN-"9.0.0"}
export IOS_SIMULATOR_VERSION_MIN=${IOS_SIMULATOR_VERSION_MIN-$IOS_VERSION_MIN}

echo
echo "Warnings related to headers being present but not usable are due to functions"
echo "that didn't exist in the specified minimum iOS version level."
echo "They can be safely ignored."
echo
echo "Define the LIBSODIUM_FULL_BUILD environment variable to build the full"
echo "library (including all deprecated/undocumented/low-level functions)."
echo
echo "Define the LIBSODIUM_SKIP_SIMULATORS environment variable to skip building"
echo "the simulators libraries (iOS, watchOS, tvOS, visionOS simulators)."
echo

if [ -z "$LIBSODIUM_FULL_BUILD" ]; then
  export LIBSODIUM_ENABLE_MINIMAL_FLAG="--enable-minimal"
else
  export LIBSODIUM_ENABLE_MINIMAL_FLAG=""
fi

NPROCESSORS=$(getconf NPROCESSORS_ONLN 2>/dev/null || getconf _NPROCESSORS_ONLN 2>/dev/null)
PROCESSORS=${NPROCESSORS:-3}

swift_module_map() {
  echo 'module Clibsodium {'
  echo '    header "sodium.h"'
  echo '    export *'
  echo '}'
}

build_ios_simulator() {
  export BASEDIR="${XCODEDIR}/Platforms/iPhoneSimulator.platform/Developer"
  export PATH="${BASEDIR}/usr/bin:$BASEDIR/usr/sbin:$PATH"
  export SDK="${BASEDIR}/SDKs/iPhoneSimulator.sdk"


  ## x86_64 simulator
  export CFLAGS="-O3 -arch x86_64 -isysroot ${SDK} -mios-simulator-version-min=${IOS_SIMULATOR_VERSION_MIN}"
  export LDFLAGS="-arch x86_64 -isysroot ${SDK} -mios-simulator-version-min=${IOS_SIMULATOR_VERSION_MIN}"

  make distclean >/dev/null 2>&1
  ./configure --host=x86_64-apple-darwin23 --prefix="$IOS_SIMULATOR_X86_64_PREFIX" \
    ${LIBSODIUM_ENABLE_MINIMAL_FLAG}
  make -j${PROCESSORS} install || exit 1
}

mkdir -p "${PREFIX}/tmp"

if [ -z "$LIBSODIUM_SKIP_SIMULATORS" ]; then
  echo "Building for the iOS simulator..."
  build_ios_simulator >"$LOG_FILE" 2>&1 || exit 1
else
  echo "[Skipping the simulators]"
fi

echo "Adding the Clibsodium module map for Swift..."

find "$PREFIX" -name "include" -type d -print | while read -r f; do
  swift_module_map >"${f}/module.modulemap"
done

if [ -z "$LIBSODIUM_SKIP_SIMULATORS" ]; then
  echo "Bundling iOS simulators..."

  mkdir -p "${PREFIX}/ios-simulators/lib"
  cp -a "${IOS_SIMULATOR_X86_64_PREFIX}/include" "${PREFIX}/ios-simulators/"
  for ext in a; do
    LIBRARY_PATHS="$LIBRARY_PATHS ${IOS_SIMULATOR_X86_64_PREFIX}/lib/libsodium.${ext}"
    lipo -create \
      ${LIBRARY_PATHS} \
      -output "${PREFIX}/ios-simulators/lib/libsodium.${ext}" || exit 1
  done
fi

echo "Creating Clibsodium.xcframework..."

rm -rf "${PREFIX}/Clibsodium.xcframework"

XCFRAMEWORK_ARGS=""
if [ -z "$LIBSODIUM_SKIP_SIMULATORS" ]; then
  for f in ios-simulators; do
    XCFRAMEWORK_ARGS="${XCFRAMEWORK_ARGS} -library $(readlink -f ${PREFIX}/${f}/lib/libsodium.a)"
    XCFRAMEWORK_ARGS="${XCFRAMEWORK_ARGS} -headers $(readlink -f ${PREFIX}/${f}/include)"
  done
fi
xcodebuild -create-xcframework \
  ${XCFRAMEWORK_ARGS} \
  -output "${PREFIX}/Clibsodium.xcframework" >/dev/null

ls -ld -- "$PREFIX"
ls -l -- "$PREFIX"
ls -l -- "$PREFIX/Clibsodium.xcframework"

echo "Done!"

# Cleanup
rm -rf -- "$PREFIX/tmp"
make distclean >/dev/null

[jedisct1]

I'm using an Intel Mac, so there must be more to the story. What operating system and Xcode version are you actually using?

[matkatmusic]

HI @jedisct1

I'm using XCode 15.4 (15F31d) on MacOS Sonoma 14.5.
My intel mac is from 2020, a 27" 3.8ghz 8core i7.

The other thing was that I had to move the apple-xcframework.sh file up one folder level, because every time I ran it, the build_log file said:

./apple-xcframework.sh: line 82: ./configure: No such file or directory

Let me know if there is any more information you need to get that script working on another intel mac.

btw, libsodium is awesome, such a great and useful framework!

[jedisct1]

You don't need to move the script. Run it from the top-level directory: dist-build/apple-xcframework.sh.

Or grab the precompiled framework from swift-sodium, which is actually what this script was written for.