can't cross build x86_64 mpv on a arm64 macOS

Important Information

- mpv version: git master
- Platform version: arm64 mac
- Meson version: latest

Reproduction Steps

My repo: https://github.com/eko5624/mpv-mac/tree/cross

failed log:
https://github.com/eko5624/mpv-mac/actions/runs/12462323821/job/34787841907

sucessed log:
https://github.com/eko5624/mpv-mac/actions/runs/12464492354/job/34788650939

workaround:

cd mpv
ln -s /PATH/TO/include/libplacebo libplacebo
ln -s /PATH/TO/include/libavutil libavutil
ln -s /PATH/TO/include/vulkan vulkan
ln -s /PATH/TO/include/vk_video vk_video

Expected Behavior

build without workaround

Actual Behavior

This is my env setting.

build env:

#!/hint/bash

DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
TOOLS="$DIR/tools"
PACKAGES="$DIR/packages"
WORKSPACE="$DIR/workspace"
mkdir -p "$TOOLS"
mkdir -p "$PACKAGES"
mkdir -p "$WORKSPACE"
PATH="${TOOLS}/bin:$PATH"
 
if [ "$ARCHS" == "x86_64" ]; then
  ARCH="x86_64"
  if [ "$(uname -m)" != "x86_64" ]; then
    BUILD_HOST="--host=x86_64-apple-darwin --target=x86_64-apple-macos11.0"
  else
    BUILD_HOST=""  
  fi  
elif [ "$ARCHS" == "arm64" ]; then
  ARCH="aarch64"
  if [ "$(uname -m)" != "arm64" ]; then
    BUILD_HOST="--host=aarch64-apple-darwin --target=arm64-apple-macos11.0"
    X265_CMAKEFLAGS="-DENABLE_NEON=OFF" #fix cross build x265 arm64 library on x86_64 macOS
  else  
    BUILD_HOST=""
  fi
fi

CC="clang"
CXX="clang++"
CPP="clang -E"
CXXCPP="clang++ -E"
MACOSX_TARGET="11.0"
MACOSX_DEPLOYMENT_TARGET="11.0"
SWIFT_FLAGS="-target $ARCHS-apple-macosx11.0"
SDKROOT="/Applications/Xcode_15.2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk"
XCTOOLCHAIN="/Applications/Xcode_15.2.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/"
CFLAGS="-arch $ARCHS -target $ARCHS-apple-macos11.0 -isysroot $SDKROOT -mmacosx-version-min=11.0 -I$WORKSPACE/include -Wno-int-conversion"
LDFLAGS="-arch $ARCHS -target $ARCHS-apple-macos11.0 -isysroot $SDKROOT -mmacosx-version-min=11.0 -L$WORKSPACE/lib -Wl,-ld_classic -framework CoreFoundation"
CXXFLAGS="$CFLAGS"
CPPFLAGS="$CFLAGS"
EXTRALIBS="-ldl -lpthread -lm -lz -lc++"

PKG_CONFIG="pkgconf --static"
PKG_CONFIG_PATH="$WORKSPACE/lib/pkgconfig"

LIBRARY_PATH="$WORKSPACE/lib"
C_INCLUDE_PATH="$WORKSPACE/include"
CPLUS_INCLUDE_PATH="${C_INCLUDE_PATH}"

CURL_RETRIES="--connect-timeout 60 --retry 5 --retry-delay 5"

# Speed up the process
# Env Var NUMJOBS overrides automatic detection
if [[ -n "$NUMJOBS" ]]; then
  MJOBS="$NUMJOBS"
elif [[ -f /proc/cpuinfo ]]; then
  MJOBS=$(grep -c processor /proc/cpuinfo)
elif [[ "$OSTYPE" == "darwin"* ]]; then
  MJOBS=$(sysctl -n machdep.cpu.thread_count)
  MACOS_LIBTOOL="$(which libtool)" # gnu libtool is installed in this script and need to avoid name conflict
else
  MJOBS=3
fi

messon_cross_x86_64.txt

[constants]
sdkroot = '/Applications/Xcode_15.2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk'

[host_machine]
system = 'darwin'
cpu_family = 'x86_64'
cpu = 'x86_64'
endian = 'little'

[binaries]
c = ['clang']
cpp = ['clang++']
objc = ['clang']
objcpp = ['clang++']
nm = ['nm']
ar = ['ar']
strings = ['strings']
ranlib = ['ranlib']
strip = ['strip']
pkg-config = ['pkgconf']

[built-in options]
c_args = ['-arch', 'x86_64', '-isysroot', sdkroot, '-mmacosx-version-min=11.0']
cpp_args = ['-arch', 'x86_64', '-isysroot', sdkroot, '-mmacosx-version-min=11.0', '-stdlib=libc++']
objc_args = ['-arch', 'x86_64', '-isysroot', sdkroot, '-mmacosx-version-min=11.0']
objcpp_args = ['-arch', 'x86_64', '-isysroot', sdkroot, '-mmacosx-version-min=11.0', '-stdlib=libc++']
c_link_args = ['-arch', 'x86_64', '-isysroot', sdkroot, '-mmacosx-version-min=11.0']
cpp_link_args = ['-arch', 'x86_64', '-isysroot', sdkroot, '-mmacosx-version-min=11.0']
objc_link_args = ['-arch', 'x86_64', '-isysroot', sdkroot, '-mmacosx-version-min=11.0']
objcpp_link_args = ['-arch', 'x86_64', '-isysroot', sdkroot, '-mmacosx-version-min=11.0']

mpv.sh

#!/bin/bash
set -e

cd "$(dirname "$0")" && cd ..
set -a; source build.env; source ver.sh; set +a

cd $PACKAGES
git clone https://github.com/mpv-player/mpv.git

export CFLAGS="$CFLAGS -Wno-error=deprecated -Wno-error=deprecated-declarations"
export LDFLAGS="$LDFLAGS -Wl,-no_compact_unwind"
cd mpv
#git reset --hard 23843b4aa594dc8c885575f3d237cde3c29398a2
#export TOOLCHAINS=$(/usr/libexec/PlistBuddy -c "Print :CFBundleIdentifier" /Library/Developer/Toolchains/swift-latest.xctoolchain/Info.plist)
if [[ ("$(uname -m)" == "arm64") && ("$ARCHS" == "x86_64") ]] || [[ ("$(uname -m)" == "x86_64") && ("$ARCHS" == "arm64") ]]; then
  ln -s $WORKSPACE/include/libplacebo libplacebo
  ln -s $WORKSPACE/include/libavutil libavutil
  ln -s $WORKSPACE/include/vulkan vulkan
  ln -s $WORKSPACE/include/vk_video vk_video
fi  
meson setup build \
  --buildtype=release \
  --cross-file="$DIR/meson_$ARCHS.txt" \
  -Dwrap_mode=nodownload \
  -Db_lto=true \
  -Db_lto_mode=thin \
  -Dobjc_args="-Wno-error=deprecated -Wno-error=deprecated-declarations" \
  -Dlibmpv=true \
  -Dvulkan=enabled \
  -Diconv=enabled \
  -Dmanpage-build=disabled \
  -Dswift-flags="${SWIFT_FLAGS}"
meson compile -C build
#meson compile -C build macos-bundle

# get latest commit sha
short_sha=$(git rev-parse --short HEAD)
echo $short_sha > build/SHORT_SHA

# bundle mpv
cp -r TOOLS/osxbundle/mpv.app build
cp build/mpv build/mpv.app/Contents/MacOS
cp $WORKSPACE/lib/libluajit-5.1.2.dylib build/mpv.app/Contents/MacOS/lib
#cp $WORKSPACE/lib/libvapoursynth-script.0.dylib build/mpv.app/Contents/MacOS/lib
mkdir -p build/mpv.app/Contents/Frameworks
mkdir -p build/mpv.app/Contents/Resources/vulkan/icd.d
cp $WORKSPACE/lib/libMoltenVK.dylib build/mpv.app/Contents/Frameworks
cp $WORKSPACE/share/vulkan/icd.d/MoltenVK_icd.json build/mpv.app/Contents/Resources/vulkan/icd.d
sed -i "" 's|../../../lib/libMoltenVK.dylib|../../../Frameworks/libMoltenVK.dylib|g' build/mpv.app/Contents/Resources/vulkan/icd.d/MoltenVK_icd.json

mpv_deps=($(otool -L $PACKAGES/mpv/build/mpv.app/Contents/MacOS/mpv | grep -e '\t' | grep -Ev "\/usr\/lib|\/System|@rpath" | awk '{ print $1 }'))
for f in "${mpv_deps[@]}"; do
  sudo install_name_tool -id "@executable_path/lib/$(basename $f)" "build/mpv.app/Contents/MacOS/lib/$(basename $f)"
  sudo install_name_tool -change "$f" "@executable_path/lib/$(basename $f)" build/mpv.app/Contents/MacOS/mpv
done

# setting rpath
rpaths=($(otool -l build/mpv.app/Contents/MacOS/mpv | grep -A2 LC_RPATH | grep path | awk '{ print $2 }'))
for f in "${rpaths[@]}"; do
  sudo install_name_tool -delete_rpath $f build/mpv.app/Contents/MacOS/mpv
done
sudo install_name_tool -add_rpath @executable_path/lib build/mpv.app/Contents/MacOS/mpv


# Codesign mpv.app
codesign --deep -fs - build/mpv.app

cd $DIR
# Zip mpv.app and mpv config files
mkdir mpv
git clone https://github.com/eko5624/mpv-config.git
mv mpv-config/macos_config mpv
cp -r $PACKAGES/mpv/build/mpv.app mpv
cp $PACKAGES/mpv/build/SHORT_SHA mpv
zip -r mpv-$ARCHS-git-$short_sha.zip mpv/*

# Zip libmpv
mkdir -p libmpv/include
cp $PACKAGES/mpv/build/libmpv.2.dylib libmpv
cp $PACKAGES/mpv/build/mpv.app/Contents/MacOS/lib/*.dylib libmpv
cp $PACKAGES/mpv/libmpv/client.h libmpv/include
cp $PACKAGES/mpv/libmpv/stream_cb.h libmpv/include
cp $PACKAGES/mpv/libmpv/render.h libmpv/include
cp $PACKAGES/mpv/libmpv/render_gl.h libmpv/include
zip -r libmpv-$ARCHS-$short_sha.zip libmpv/*

# Zip ffmpeg
mkdir ffmpeg
cp $WORKSPACE/bin/ffmpeg ffmpeg
mv $WORKSPACE/SHORT_SHA ffmpeg
ffmpeg_sha=$(cat ffmpeg/SHORT_SHA)
zip -r ffmpeg-$ARCHS-$ffmpeg_sha.zip ffmpeg/*

Log File

logs_32369201623.zip

I carefully read all instruction and confirm that I did the following:

• I tested with the latest mpv version to validate that the issue is not already fixed.
• I provided all required information including system and mpv version.
• I produced the log file with the exact same set of parameters, and conditions used in "Reproduction Steps".
• I produced the log file while the behaviors described in "Actual Behavior" were actively observed.
• I attached the full, untruncated log file.

Start with mpv.sh and meson_cross_x86_64.txt, then compare the linked failed and successful build logs to identify why the cross-build needs the header symlinks. Verify the result by running the documented x86_64 build on arm64 macOS without those symlinks; done means the build completes without the workaround.