Rollup merge of #86856 - jyn514:x.py-less-verbose, r=Mark-Simulacrum
Make x.py less verbose on failures
- Don't print the exact command run by rustbuild unless `--verbose` is set.
This is almost always unhelpful, since it's just cargo with a lot of
arguments (and you can't replicate it anyway unless you have the environment variables, which aren't printed by default).
- Don't print "Build completed unsuccessfully" unless --verbose is set.
You can already tell the build failed by the errors above, and the
time isn't particularly helpful.
- Don't print the full path to bootstrap. This is useless to everyone,
even including when working on x.py itself. You can still opt-in to
this being shown with `--verbose`, since it will throw an exception.
Before:
```
error[E0432]: unresolved import `x`
--> library/std/src/lib.rs:343:5
|
343 | use x;
| ^ no external crate `x`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0432`.
error: could not compile `std`
To learn more, run the command again with --verbose.
command did not execute successfully: "/home/joshua/rustc4/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "check" "--target" "x86_64-unknown-linux-gnu" "-Zbinary-dep-depinfo" "-j" "8" "--release" "--features" "panic-unwind backtrace" "--manifest-path" "/home/joshua/rustc4/library/test/Cargo.toml" "--message-format" "json-render-diagnostics"
expected success, got: exit status: 101
failed to run: /home/joshua/rustc4/build/bootstrap/debug/bootstrap check
Build completed unsuccessfully in 0:00:13
```
After:
```
error[E0432]: unresolved import `x`
--> library/std/src/lib.rs:343:5
|
343 | use x;
| ^ no external crate `x`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0432`.
error: could not compile `std`
To learn more, run the command again with --verbose.
```
cc https://github.com/rust-lang/rust/issues/86854, https://github.com/rust-lang/rust/pull/86022
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