[PetkoKuzmanov]

Build ViroKit for the iOS Simulator

ViroKit only built for devices, so any app using Viro failed to link for the iOS Simulator. This adds a simulator build (arm64 and x86_64) and stages ViroKit into viro as ViroKit.xcframework, with a device slice and a simulator slice.

Changes

Simulator libraries. ViroKit links three libraries that had no arm64 simulator build:

• LinearMath (Bullet 2.87) and protobuf-lite 3.2.0: ios/build_ios_simulator_libs.sh builds them from source and adds the arm64 slices to the existing x86_64 archives. protobuf is built with -Dgoogle=google_public, the namespace ViroKit links against.
• GVR Audio: it's closed source, so ios/retag_for_simulator.py relabels its arm64 device objects as iOS Simulator objects, in Libraries/GVRAudioSDK/simulator. The relabelled objects have the same code, relocations, symbols and data as the device build; only the platform label differs.

Search paths. The simulator finds that GVR build first. The device libreactvisioncca.a is no longer on the search path used by every SDK, where the simulator link found it before its own build.

Staging. "Lipo Framework and Copy to Bridge" now builds viro/ios/dist/ViroRenderer/ViroKit.xcframework:

• It replaces only the slice of the platform it just built, so device and simulator builds can run in either order.
• It skips a simulator build that lacks arm64 or x86_64. An app's Release simulator build asks for both, and CocoaPods refuses a slice missing either.
• It runs after [CP] Copy Pods Resources, so the ARCore resource bundles are in every staged copy.
• It takes the framework's Info.plist as an input. On a build from clean, it used to copy the framework before the plist existed.
• The Jenkins phase makes its universal framework only when the two builds share no architecture.

ViroKit.podspec vendors the xcframework.

Testing

• Device and simulator Release builds of ViroKit, both from clean. Both slices are staged complete, each with its own Info.plist.
• The device slice's exported symbols match the committed ViroKit.framework. Apart from the GVR Audio library, the only difference between the device and simulator builds is ARCore's Core ML executor, which ARCore's own simulator build lacks.
• StudioGo (Release) links and runs in the iOS 27 simulator on the resulting xcframework, and its device build links.
• Not done: launching the device build on a phone.

Notes

• Arm64 simulator slices for Bullet Collision, Dynamics and SoftBody, freetype and reactvisioncca were already in ios/Libraries.
• The matching viro PR carries the rebuilt binaries.