Commits on May 31, 2023

1. Make x test --dry-run less verbose …

   Previously, this would print a message for each doctest, which was quite
   verbose:
   ```
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/exploit-mitigations.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/instrument-coverage.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/json.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/linker-plugin-lto.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/lints/groups.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/lints/index.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/lints/levels.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/platform-support/aarch64-apple-ios-sim.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/platform-support/aarch64-nintendo-switch-freestanding.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/platform-support/apple-watchos.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/platform-support/armeb-unknown-linux-gnueabi.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/platform-support/armv4t-none-eabi.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/platform-support/armv5te-none-eabi.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/platform-support/armv6k-nintendo-3ds.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/platform-support/armv7-sony-vita-newlibeabihf.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/platform-support/armv7-unknown-linux-uclibceabi.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/platform-support/armv7-unknown-linux-uclibceabihf.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/platform-support/esp-idf.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/platform-support/fuchsia.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/platform-support/kmc-solid.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/platform-support/loongarch-linux.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/platform-support/m68k-unknown-linux-gnu.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/platform-support/mipsel-sony-psx.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/platform-support/nto-qnx.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/platform-support/openbsd.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/platform-support/openharmony.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/platform-support/riscv32imac-unknown-xous-elf.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/platform-support/unknown-uefi.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/platform-support/wasm64-unknown-unknown.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/platform-support/x86_64-fortanix-unknown-sgx.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/platform-support/x86_64-unknown-none.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/profile-guided-optimization.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/target-tier-policy.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/targets/custom.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/targets/index.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/tests/index.md
   doc tests for: /home/jyn/src/rust/src/doc/rustc/src/what-is-rustc.md
   ```

   

   jyn514 committed May 31, 2023
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2. Fix x test --stage 2 core when download-rustc is enabled …

   This works by building std from source unconditionally instead of downloading it, for library tests only.
   
   This was somewhat complicated because of the following requirements:
   1. Unconditionally downloading libstd breaks `x test std`, because `coretests` requires the std loaded from the sysroot to match the std that's currently being tested.
   2. Unconditionally rebuilding libstd breaks `x test ui-fulldeps librustdoc`, because anything loading `rustc_private` needs to use the same libstd that rustc was built with.
   
   Break the knot by introducing a new `stage2-test-sysroot`, used only for testing `std` itself. This
   holds a freshly compiled std, while `stage2` and `ci-rustc-sysroot` still hold the downloaded std.
   
   This also extends the existing `cp_filtered` in Sysroot to apply to the `rust-std` component, not just the `rustc-dev` component.

   

   jyn514 committed May 31, 2023
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