[engine,build] Fix Fuchsia RBE build#177865
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This pull request updates the Fuchsia build configuration to fix issues with Remote Build Execution (RBE). The main changes include explicitly listing the __config_site file as a build input for RBE workers and removing now-unnecessary target_triple and sysroot flags from the toolchain definition, as these are handled by the Fuchsia build configs. Additionally, compiler commands are updated to use -MMD instead of -MD for dependency generation, which is a good improvement.
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As in the Dart build here: https://github.com/dart-lang/sdk/blame/fc8b3d79277c55f613423e125f49c80643d2498a/build/toolchain/fuchsia/fuchsia_toolchain.gni#L24 For unknown reasons, the `__config_site` file has to be explicitly listed as an input to the build to ensure it is available in the RBE workers. This PR also cleans up unnecessary flags from the Fuchsia toolchain definition. The target triple and sysroot flags are already injected into the compiler flags by the Fuchsia build configs. linux_fuchsia presub ran in 16 minutes.
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As in the Dart build here:
https://github.com/dart-lang/sdk/blame/fc8b3d79277c55f613423e125f49c80643d2498a/build/toolchain/fuchsia/fuchsia_toolchain.gni#L24
For unknown reasons, the
__config_sitefile has to be explicitly listed as an input to the build to ensure it is available in the RBE workers.This PR also cleans up unnecessary flags from the Fuchsia toolchain definition. The target triple and sysroot flags are already injected into the compiler flags by the Fuchsia build configs.
linux_fuchsia presub ran in 16 minutes.