ab3c5ba987
This reverts commitb16181fe6a(#52913). This relands commitf73900ba16(#52885). Previously, the `gen_snapshot_arm64` and `gen_snapshot_x64` binaries used by the tool were all built for x64 architecture. As such, developers building apps with Flutter rely on Rosetta translation with every build. This refactors the gen_snapshot build rules on macOS hosts to consistently produce `gen_snapshot_arm64` and `gen_snapshot_x64` binaries with the target architecture of the build but with as universal binaries with both host architectures. ## arm64 host build Prior to this patch we emitted: * gen_snapshot_arm64 (arch: x64, target_arch: simarm64) After this patch, we emit: * artifacts_x64/gen_snapshot_arm64 (arch: x64, target_arch: simarm64) * artifacts_arm64/gen_snapshot_arm64 (arch: arm64, target_arch: arm64) * gen_snapshot_arm64 (universal binary composed of both of the above) ## x64 host build Prior to this patch we emitted: * gen_snapshot_x64 (arch: x64, target_arch: x64) After this patch, we emit: * artifacts_x64/gen_snapshot_x64 (arch: x64, target_arch: x64) * artifacts_arm64/gen_snapshot_x64 (arch: arm64, target_arch: simx64) * gen_snapshot_x64 (universal binary composed of both of the above) Note that host builds on macOS currently default to a host architecture of x64 (can be overridden via `--force-mac-arm64`) regardless of host architecture and thus, the build itself relies on Rosetta translation when invoked on Apple Silicon arm64 hardware. This is to ensure a consistent build in CI regardless of bot architecture. See:0d2b0cd0ed/tools/gn (L502-L505)Issue: https://github.com/flutter/flutter/issues/101138 Issue: https://github.com/flutter/flutter/issues/69157 Related issue: https://github.com/flutter/flutter/issues/103386 [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style