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Alex Crichton authored
This commit adds support to the build system to execute test suites that cannot run natively but can instead run inside of a QEMU emulator. A proof-of-concept builder was added for the `arm-unknown-linux-gnueabihf` target to show off how this might work. In general the architecture is to have a server running inside of the emulator which a local client connects to. The protocol between the server/client supports compiling tests on the host and running them on the target inside the emulator. Closes #33114
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