4a824275b9
We have previously always relied upon an external tool, `ar`, to modify archives that the compiler produces (staticlibs, rlibs, etc). This approach, however, has a number of downsides: * Spawning a process is relatively expensive for small compilations * Encoding arguments across process boundaries often incurs unnecessary overhead or lossiness. For example `ar` has a tough time dealing with files that have the same name in archives, and the compiler copies many files around to ensure they can be passed to `ar` in a reasonable fashion. * Most `ar` programs found do **not** have the ability to target arbitrary platforms, so this is an extra tool which needs to be found/specified when cross compiling. The LLVM project has had a tool called `llvm-ar` for quite some time now, but it wasn't available in the standard LLVM libraries (it was just a standalone program). Recently, however, in LLVM 3.7, this functionality has been moved to a library and is now accessible by consumers of LLVM via the `writeArchive` function. This commit migrates our archive bindings to no longer invoke `ar` by default but instead make a library call to LLVM to do various operations. This solves all of the downsides listed above: * Archive management is now much faster, for example creating a "hello world" staticlib is now 6x faster (50ms => 8ms). Linking dynamic libraries also recently started requiring modification of rlibs, and linking a hello world dynamic library is now 2x faster. * The compiler is now one step closer to "hassle free" cross compilation because no external tool is needed for managing archives, LLVM does the right thing! This commit does not remove support for calling a system `ar` utility currently. We will continue to maintain compatibility with LLVM 3.5 and 3.6 looking forward (so the system LLVM can be used wherever possible), and in these cases we must shell out to a system utility. All nightly builds of Rust, however, will stop needing a system `ar`.
191 lines
4.5 KiB
Rust
191 lines
4.5 KiB
Rust
// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! The Rust compiler.
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//!
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//! # Note
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//!
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//! This API is completely unstable and subject to change.
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// Do not remove on snapshot creation. Needed for bootstrap. (Issue #22364)
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#![cfg_attr(stage0, feature(custom_attribute))]
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#![crate_name = "rustc"]
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#![unstable(feature = "rustc_private")]
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#![staged_api]
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#![crate_type = "dylib"]
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#![crate_type = "rlib"]
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#![doc(html_logo_url = "http://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
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html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
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html_root_url = "http://doc.rust-lang.org/nightly/")]
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#![feature(append)]
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#![feature(associated_consts)]
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#![feature(box_patterns)]
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#![feature(box_syntax)]
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#![feature(clone_from_slice)]
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#![feature(collections)]
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#![feature(const_fn)]
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#![feature(duration)]
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#![feature(duration_span)]
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#![feature(dynamic_lib)]
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#![feature(enumset)]
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#![feature(fs_canonicalize)]
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#![feature(hash_default)]
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#![feature(hashmap_hasher)]
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#![feature(into_cow)]
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#![feature(iter_cmp)]
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#![feature(iter_arith)]
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#![feature(libc)]
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#![feature(map_in_place)]
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#![feature(num_bits_bytes)]
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#![feature(path_ext)]
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#![feature(quote)]
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#![feature(range_inclusive)]
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#![feature(ref_slice)]
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#![feature(rustc_diagnostic_macros)]
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#![feature(rustc_private)]
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#![feature(scoped_tls)]
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#![feature(slice_bytes)]
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#![feature(slice_extras)]
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#![feature(slice_patterns)]
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#![feature(slice_position_elem)]
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#![feature(staged_api)]
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#![feature(str_char)]
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#![feature(str_match_indices)]
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#![feature(vec_push_all)]
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#![feature(wrapping)]
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#![feature(cell_extras)]
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#![feature(page_size)]
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#![cfg_attr(test, feature(test))]
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#![allow(trivial_casts)]
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extern crate arena;
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extern crate flate;
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extern crate fmt_macros;
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extern crate getopts;
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extern crate graphviz;
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extern crate libc;
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extern crate rustc_llvm;
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extern crate rustc_back;
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extern crate rustc_data_structures;
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extern crate serialize;
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extern crate rbml;
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extern crate collections;
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#[macro_use] extern crate log;
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#[macro_use] extern crate syntax;
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#[macro_use] #[no_link] extern crate rustc_bitflags;
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extern crate serialize as rustc_serialize; // used by deriving
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#[cfg(test)]
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extern crate test;
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pub use rustc_llvm as llvm;
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#[macro_use]
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mod macros;
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// NB: This module needs to be declared first so diagnostics are
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// registered before they are used.
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pub mod diagnostics;
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pub mod back {
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pub use rustc_back::abi;
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pub use rustc_back::arm;
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pub use rustc_back::mips;
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pub use rustc_back::mipsel;
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pub use rustc_back::rpath;
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pub use rustc_back::svh;
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pub use rustc_back::target_strs;
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pub use rustc_back::x86;
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pub use rustc_back::x86_64;
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}
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pub mod ast_map;
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pub mod middle {
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pub mod astconv_util;
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pub mod astencode;
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pub mod cast;
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pub mod cfg;
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pub mod check_const;
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pub mod check_static_recursion;
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pub mod check_loop;
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pub mod check_match;
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pub mod check_rvalues;
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pub mod const_eval;
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pub mod dataflow;
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pub mod dead;
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pub mod def;
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pub mod dependency_format;
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pub mod effect;
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pub mod entry;
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pub mod expr_use_visitor;
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pub mod fast_reject;
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pub mod free_region;
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pub mod intrinsicck;
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pub mod infer;
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pub mod implicator;
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pub mod lang_items;
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pub mod liveness;
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pub mod mem_categorization;
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pub mod pat_util;
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pub mod privacy;
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pub mod reachable;
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pub mod region;
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pub mod recursion_limit;
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pub mod resolve_lifetime;
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pub mod stability;
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pub mod subst;
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pub mod traits;
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pub mod ty;
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pub mod ty_fold;
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pub mod ty_match;
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pub mod ty_relate;
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pub mod ty_walk;
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pub mod weak_lang_items;
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}
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pub mod metadata;
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pub mod session;
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pub mod plugin;
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pub mod lint;
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pub mod util {
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pub use rustc_back::sha2;
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pub mod common;
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pub mod ppaux;
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pub mod nodemap;
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pub mod lev_distance;
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pub mod num;
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pub mod fs;
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}
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pub mod lib {
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pub use llvm;
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}
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// A private module so that macro-expanded idents like
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// `::rustc::lint::Lint` will also work in `rustc` itself.
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//
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// `libstd` uses the same trick.
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#[doc(hidden)]
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mod rustc {
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pub use lint;
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}
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// Build the diagnostics array at the end so that the metadata includes error use sites.
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__build_diagnostic_array! { librustc, DIAGNOSTICS }
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