9298bd8197
rustdoc: Fix ICE report The ICE report in rustdoc was confusing because it was returning an argument parse error: ``` thread 'rustc' panicked at 'aborting due to `-Z treat-err-as-bug=1`', compiler/rustc_errors/src/lib.rs:1212:27 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace error: internal compiler error: unexpected panic error: Unrecognized option: 'crate-version' ``` This is because the ICE reporter was trying to parse the arguments as rustc, not rustdoc. Since an argument error is a fatal error, it was early-exiting with the argument error due to unwinding. This changes it to be a more primitive scan of the arguments. The arguments being checked are pretty simple, and only have a small handful of forms that are easy to check for. It now looks like this: ``` thread 'rustc' panicked at 'aborting due to `-Z treat-err-as-bug=1`', compiler/rustc_errors/src/lib.rs:1212:27 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace error: internal compiler error: unexpected panic note: the compiler unexpectedly panicked. this is a bug. note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md note: rustc 1.59.0-dev running on x86_64-apple-darwin note: compiler flags: --crate-type lib -Z treat-err-as-bug note: some of the compiler flags provided by cargo are hidden query stack during panic: end of query stack ``` It still says `rustc`, but I can live with that.
The driver crate is effectively the "main" function for the rust
compiler. It orchestrates the compilation process and "knits together"
the code from the other crates within rustc. This crate itself does
not contain any of the "main logic" of the compiler (though it does
have some code related to pretty printing or other minor compiler
options).
For more information about how the driver works, see the rustc dev guide.