【Unity】Xcode 15 でビルドできるようにするエディタ拡張

ソースコード

using UnityEditor;
using UnityEditor.Callbacks;
using UnityEditor.iOS.Xcode;

namespace Kogane.Internal
{
    /// <summary>
    /// Xcode 15 でビルドできるようにするエディタ拡張
    /// Xcode の Build Settings の「Other Linker Flags」に「-ld_classic」を設定することでビルドできるようにする
    ///
    /// https://forum.unity.com/threads/project-wont-build-using-xode15-release-candidate.1491761/
    ///
    /// https://developer.apple.com/documentation/xcode-release-notes/xcode-15-release-notes
    /// > Known Issues
    /// > Binaries using symbols with a weak definition crash at runtime on iOS 14/macOS 12 or older.
    /// > This impacts primarily C++ projects due to their extensive use of weak symbols. (114813650) (FB13097713)
    /// >
    /// > Workaround: Bump the minimum deployment target to iOS 15, macOS 12, watchOS 8 or tvOS 15, or add -Wl,
    /// > -ld_classic to the OTHER_LDFLAGS build setting.
    /// </summary>
    internal static class FixXcode15BuildOnPostProcessBuild
    {
        //================================================================================
        // 関数(static)
        //================================================================================
        /// <summary>
        /// ビルド完了時に呼び出されます
        /// </summary>
        [PostProcessBuild]
        private static void OnPostProcessBuild
        (
            BuildTarget buildTarget,
            string      pathToBuiltProject
        )
        {
            if ( buildTarget != BuildTarget.iOS ) return;

            var projectPath = PBXProject.GetPBXProjectPath( pathToBuiltProject );
            var project     = new PBXProject();

            project.ReadFromFile( projectPath );

            var targetGuid = project.GetUnityMainTargetGuid();

            project.AddBuildProperty( targetGuid, "OTHER_LDFLAGS", "-ld_classic" );
            project.WriteToFile( projectPath );
        }
    }
}

補足

Binaries using symbols with a weak definition crash at runtime on iOS 14/macOS 12 or older. This impacts primarily C++ projects due to their extensive use of weak symbols. (114813650) (FB13097713)

Workaround: Bump the minimum deployment target to iOS 15, macOS 12, watchOS 8 or tvOS 15, or add -Wl,-ld_classic to the OTHER_LDFLAGS build setting.

Weak symbol imports are linked as non-weak imports, when used from LTO object files. (115521975) (FB13171424)

Workaround: Add -Wl,-weak_reference_mismatches,weak or -Wl,-ld_classic options to the OTHER_LDFLAGS build setting.

Xcode 15 の既知の問題の回避策として、
OTHER_LDFLAGS に ld_classic を追加するように紹介されている

参考サイト様