Using rustc as a library hits "can't find crate for std" error #11792
Description
The following is the parse, expand & analyse steps of the compiler (cribbed from rustdoc). Running on any non-#[no_std] file causes the following error:
rustc_lib_example.rs:1:1: 1:1 error: can't find crate for `std` rustc_lib_example.rs:1 #[feature(managed_boxes)]; ^ #[feature(managed_boxes)]; extern mod rustc; extern mod syntax; use std::os; use rustc::driver::{driver, session}; use rustc::metadata::creader::Loader; use syntax::diagnostic; /// Extract the expanded ast of a crate, along with the codemap which /// connects source code locations to the actual code. fn main() { let path = Path::new(os::args()[1]); let parsesess = syntax::parse::new_parse_sess(None); let input = driver::FileInput(path); let sessopts = @session::Options { binary: ~"example", .. (*session::basic_options()).clone() }; let diagnostic_handler = diagnostic::mk_handler(None); let span_diagnostic_handler = diagnostic::mk_span_handler(diagnostic_handler, parsesess.cm); let sess = driver::build_session_(sessopts, parsesess.cm, @diagnostic::DefaultEmitter as @diagnostic::Emitter, span_diagnostic_handler); let cfg = driver::build_configuration(sess); let crate = driver::phase_1_parse_input(sess, cfg.clone(), &input); let loader = &mut Loader::new(sess); let (crate, ast_map) = driver::phase_2_configure_and_expand(sess, cfg, loader, crate); driver::phase_3_run_analysis_passes(sess, &crate, ast_map); }This makes rustc completely unusable as a library for out-of-source-tree tools.