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Implement RFC3137 trim-paths sysroot changes - take 2 This PR is a continuation of https://github.com/rust-lang/rust/pull/118149. Nothing really changed, except for https://github.com/rust-lang/rust/pull/129408 which I was able to trigger locally. Original description: > Implement parts of #111540 > > Right now, backtraces into sysroot always shows /rustc/$hash in diagnostics, e.g. > > ``` > thread 'main' panicked at 'hello world', map-panic.rs:2:50 > stack backtrace: > 0: std::panicking::begin_panic > at /rustc/a55dd71d5fb0ec5a6a3a9e8c27b2127ba491ce52/library/std/src/panicking.rs:616:12 > 1: map_panic::main::{{closure}} > at ./map-panic.rs:2:50 > 2: core::option::Option<T>::map > at /rustc/a55dd71d5fb0ec5a6a3a9e8c27b2127ba491ce52/library/core/src/option.rs:929:29 > 3: map_panic::main > at ./map-panic.rs:2:30 > 4: core::ops::function::FnOnce::call_once > at /rustc/a55dd71d5fb0ec5a6a3a9e8c27b2127ba491ce52/library/core/src/ops/function.rs:248:5 > note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace. > ``` > > [RFC 3127 said](https://rust-lang.github.io/rfcs/3127-trim-paths.html#changing-handling-of-sysroot-path-in-rustc) > > > We want to change this behaviour such that, when rust-src source files can be discovered, the virtual path is discarded and therefore the local path will be embedded, unless there is a --remap-path-prefix that causes this local path to be remapped in the usual way. > > This PR implements this behaviour. When `rust-src` is present at compile time, rustc replaces /rustc/$hash with a real path into local rust-src with best effort. To sanitise this, users must explicitly supply `--remap-path-prefix=<path to rust-src>=foo`. cc `@cbeuw` Fix #105907 Fix #85463 try-job: dist-x86_64-linux try-job: x86_64-msvc try-job: dist-x86_64-msvc try-job: armhf-gnu |
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