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Alex Crichton fce4a174b9 Implement LTO 
This commit implements LTO for rust leveraging LLVM's passes. What this means
is:

* When compiling an rlib, in addition to insdering foo.o into the archive, also
  insert foo.bc (the LLVM bytecode) of the optimized module.

* When the compiler detects the -Z lto option, it will attempt to perform LTO on
  a staticlib or binary output. The compiler will emit an error if a dylib or
  rlib output is being generated.

* The actual act of performing LTO is as follows:

    1. Force all upstream libraries to have an rlib version available.
    2. Load the bytecode of each upstream library from the rlib.
    3. Link all this bytecode into the current LLVM module (just using llvm
       apis)
    4. Run an internalization pass which internalizes all symbols except those
       found reachable for the local crate of compilation.
    5. Run the LLVM LTO pass manager over this entire module

    6a. If assembling an archive, then add all upstream rlibs into the output
        archive. This ignores all of the object/bitcode/metadata files rust
        generated and placed inside the rlibs.
    6b. If linking a binary, create copies of all upstream rlibs, remove the
        rust-generated object-file, and then link everything as usual.

As I have explained in #10741, this process is excruciatingly slow, so this is
*not* turned on by default, and it is also why I have decided to hide it behind
a -Z flag for now. The good news is that the binary sizes are about as small as
they can be as a result of LTO, so it's definitely working.

Closes #10741
Closes #10740
2013-12-09 14:41:49 -08:00
doc rewrite part of the tutorial 2013-12-04 16:55:03 -05:00
man remove the rusti command 2013-10-16 22:54:38 -04:00
mk Register new snapshots 2013-12-07 23:02:39 -08:00
src Implement LTO 2013-12-09 14:41:49 -08:00
.gitattributes drop the linenoise library 2013-10-16 22:57:51 -04:00
.gitignore Link rustllvm statically, and distribute a static snapshot 2013-12-06 20:51:17 -08:00
.gitmodules Point gyp submodule toward github 2013-10-25 20:23:53 -07:00
.mailmap .mailmap: tolerate different names, emails in shortlog 2013-06-05 23:26:00 +05:30
AUTHORS.txt Update AUTHORS.txt 2013-09-24 16:26:27 -07:00
configure Make the ccache-free case look like the ccache case. 2013-12-02 19:25:14 +01:00
CONTRIBUTING.md syntax: Add the Bug Report HOWTO URL to the ICE message 2013-10-21 12:11:24 -07:00
COPYRIGHT add gitattributes and fix whitespace issues 2013-05-03 20:01:42 -04:00
LICENSE-APACHE Update license, add license boilerplate to most files. Remainder will follow. 2012-12-03 17:12:14 -08:00
LICENSE-MIT tidy version numbers and copyright dates 2013-04-01 16:15:49 -07:00
Makefile.in Register new snapshots 2013-12-07 23:02:39 -08:00
README.md Update version numbers to 0.8 2013-09-21 16:25:08 -07:00
RELEASES.txt remove the rusti command 2013-10-16 22:54:38 -04:00

README.md

The Rust Programming Language

This is a compiler for Rust, including standard libraries, tools and documentation.

Quick Start

Windows

  1. Download and use the installer.
  2. Read the tutorial.
  3. Enjoy!

Note: Windows users should read the detailed getting started notes on the wiki. Even when using the binary installer the Windows build requires a MinGW installation, the precise details of which are not discussed here.

Linux / OS X

  1. Install the prerequisites (if not already installed)

    • g++ 4.4 or clang++ 3.x
    • python 2.6 or later (but not 3.x)
    • perl 5.0 or later
    • gnu make 3.81 or later
    • curl

  2. Download and build Rust You can either download a tarball or build directly from the repo.

    To build from the tarball do:

     $ curl -O http://static.rust-lang.org/dist/rust-0.8.tar.gz
 $ tar -xzf rust-0.8.tar.gz
 $ cd rust-0.8

    Or to build from the repo do:

     $ git clone https://github.com/mozilla/rust.git
 $ cd rust

    Now that you have Rust's source code, you can configure and build it:

     $ ./configure
 $ make && make install

    You may need to use sudo make install if you do not normally have permission to modify the destination directory. The install locations can be adjusted by passing a --prefix argument to configure. Various other options are also supported, pass --help for more information on them.

    When complete, make install will place several programs into /usr/local/bin: rustc, the Rust compiler; rustdoc, the API-documentation tool, and rustpkg, the Rust package manager and build system.

  3. Read the tutorial.

  4. Enjoy!

Notes

Since the Rust compiler is written in Rust, it must be built by a precompiled "snapshot" version of itself (made in an earlier state of development). As such, source builds require a connection to the Internet, to fetch snapshots, and an OS that can execute the available snapshot binaries.

Snapshot binaries are currently built and tested on several platforms:

  • Windows (7, Server 2008 R2), x86 only
  • Linux (various distributions), x86 and x86-64
  • OSX 10.6 ("Snow Leopard") or greater, x86 and x86-64

You may find that other platforms work, but these are our "tier 1" supported build environments that are most likely to work.

Rust currently needs about 1.8G of RAM to build without swapping; if it hits swap, it will take a very long time to build.

There is lots more documentation in the wiki.

License

Rust is primarily distributed under the terms of both the MIT license and the Apache License (Version 2.0), with portions covered by various BSD-like licenses.

See LICENSE-APACHE, LICENSE-MIT, and COPYRIGHT for details.