See Design Doc: https://flutter.dev/go/macos-intel-deprecation

Stage 0: Announce planned reduction of support

• Print a warning when building on a Intel machine that support will be unavailable in a future release #188330
• Print a warning when building a macOS app that supports both Intel and ARM and guide to enable feature flag #188333

Stage 1: Remove Rosetta requirement

• ☂️ [macOS] Support building engine on Apple Silicon without Rosetta #103386
• Investigate and eliminate Rosetta requirement from gen_snapshot #188386

Stage 2: Reduce support by removing Intel bots from CI

• Remove Intel test builders that already run on ARM #189295
• Migrate flutter/flutter CI x86 builds to ARM #189144
• When building a macOS app with Xcode 27+, default to build ARM-only #189136
• Remove tool_host_cross_arch_tests test shard #189302
• Running Mac framework_tests* on arm64 Macs flakes with "Skia Gold received an unapproved image in post-submit" #119880

Stage 3: Stop building Intel variants for XCFrameworks and binaries

• Remove Intel builds from engine
• Remove Intel builds for ios-usb-dependencies
• Provide tool warnings/errors if attempting to build on or target Intel machine
• Optional: Change artifact cache path from darwin-x64 to darwin-arm64 for Android and macOS