Commits on Aug 14, 2015

1. rustc: Allow changing the default allocator …

   This commit is an implementation of [RFC 1183][rfc] which allows swapping out
   the default allocator on nightly Rust. No new stable surface area should be
   added as a part of this commit.
   
   [rfc]: rust-lang/rfcs#1183
   
   Two new attributes have been added to the compiler:
   
   * `#![needs_allocator]` - this is used by liballoc (and likely only liballoc) to
     indicate that it requires an allocator crate to be in scope.
   * `#![allocator]` - this is a indicator that the crate is an allocator which can
     satisfy the `needs_allocator` attribute above.
   
   The ABI of the allocator crate is defined to be a set of symbols that implement
   the standard Rust allocation/deallocation functions. The symbols are not
   currently checked for exhaustiveness or typechecked. There are also a number of
   restrictions on these crates:
   
   * An allocator crate cannot transitively depend on a crate that is flagged as
     needing an allocator (e.g. allocator crates can't depend on liballoc).
   * There can only be one explicitly linked allocator in a final image.
   * If no allocator is explicitly requested one will be injected on behalf of the
     compiler. Binaries and Rust dylibs will use jemalloc by default where
     available and staticlibs/other dylibs will use the system allocator by
     default.
   
   Two allocators are provided by the distribution by default, `alloc_system` and
   `alloc_jemalloc` which operate as advertised.
   
   Closes rust-lang#27389

   

   alexcrichton committed Aug 14, 2015
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