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89 lines
2.9 KiB
Rust
89 lines
2.9 KiB
Rust
//! Some stuff used by rustc that doesn't have many dependencies
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//!
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//! Originally extracted from rustc::back, which was nominally the
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//! compiler 'backend', though LLVM is rustc's backend, so rustc_target
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//! is really just odds-and-ends relating to code gen and linking.
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//! This crate mostly exists to make rustc smaller, so we might put
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//! more 'stuff' here in the future. It does not have a dependency on
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//! LLVM.
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#![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
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#![feature(assert_matches)]
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#![feature(associated_type_bounds)]
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#![feature(exhaustive_patterns)]
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#![feature(let_else)]
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#![feature(min_specialization)]
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#![feature(never_type)]
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#![feature(rustc_attrs)]
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#![feature(step_trait)]
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use std::iter::FromIterator;
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use std::path::{Path, PathBuf};
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#[macro_use]
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extern crate rustc_macros;
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#[macro_use]
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extern crate tracing;
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pub mod abi;
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pub mod asm;
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pub mod json;
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pub mod spec;
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#[cfg(test)]
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mod tests;
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/// Requirements for a `StableHashingContext` to be used in this crate.
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/// This is a hack to allow using the `HashStable_Generic` derive macro
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/// instead of implementing everything in `rustc_middle`.
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pub trait HashStableContext {}
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/// The name of rustc's own place to organize libraries.
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///
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/// Used to be `rustc`, now the default is `rustlib`.
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const RUST_LIB_DIR: &str = "rustlib";
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/// Returns a `rustlib` path for this particular target, relative to the provided sysroot.
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///
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/// For example: `target_sysroot_path("/usr", "x86_64-unknown-linux-gnu")` =>
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/// `"lib*/rustlib/x86_64-unknown-linux-gnu"`.
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pub fn target_rustlib_path(sysroot: &Path, target_triple: &str) -> PathBuf {
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let libdir = find_libdir(sysroot);
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PathBuf::from_iter([
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Path::new(libdir.as_ref()),
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Path::new(RUST_LIB_DIR),
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Path::new(target_triple),
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])
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}
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/// The name of the directory rustc expects libraries to be located.
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fn find_libdir(sysroot: &Path) -> std::borrow::Cow<'static, str> {
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// FIXME: This is a quick hack to make the rustc binary able to locate
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// Rust libraries in Linux environments where libraries might be installed
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// to lib64/lib32. This would be more foolproof by basing the sysroot off
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// of the directory where `librustc_driver` is located, rather than
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// where the rustc binary is.
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// If --libdir is set during configuration to the value other than
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// "lib" (i.e., non-default), this value is used (see issue #16552).
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#[cfg(target_pointer_width = "64")]
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const PRIMARY_LIB_DIR: &str = "lib64";
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#[cfg(target_pointer_width = "32")]
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const PRIMARY_LIB_DIR: &str = "lib32";
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const SECONDARY_LIB_DIR: &str = "lib";
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match option_env!("CFG_LIBDIR_RELATIVE") {
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None | Some("lib") => {
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if sysroot.join(PRIMARY_LIB_DIR).join(RUST_LIB_DIR).exists() {
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PRIMARY_LIB_DIR.into()
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} else {
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SECONDARY_LIB_DIR.into()
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}
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}
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Some(libdir) => libdir.into(),
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}
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}
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