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+- Feature Name: N/A
+- Start Date: 2015-06-26
+- RFC PR: (leave this empty)
+- Rust Issue: (leave this empty)
+
+# Summary
+
+Tweak the `#![no_std]` attribute, add a new `#![no_core]` attribute, and
+pave the way for stabilizing the libcore library.
+
+# Motivation
+
+Currently all stable Rust programs must link to the standard library (libstd),
+and it is impossible to opt out of this. The standard library is not appropriate
+for use cases such as kernels, embedded development, or some various niche cases
+in userspace. For these applications Rust itself is appropriate, but the
+compiler does not provide a stable interface compiling in this mode.
+
+The standard distribution provides a library, libcore, which is "the essence of
+Rust" as it provides many language features such as iterators, slice methods,
+string methods, etc. The defining feature of libcore is that it has 0
+dependencies, unlike the standard library which depends on many I/O APIs, for
+example. The purpose of this RFC is to provide a stable method to access
+libcore.
+
+Applications which do not want to use libstd still want to use libcore 99% of
+the time, but unfortunately the current `#![no_std]` attribute does not do a
+great job in facilitating this. When moving into the realm of not using the
+standard library, the compiler should make the use case as ergonomic as
+possible, so this RFC proposes different behavior than today's `#![no_std]`.
+
+Finally, the standard library defines a number of language items which must be
+defined when libstd is not used. These language items are:
+
+* `panic_fmt`
+* `eh_personality`
+* `stack_exhausted`
+
+To be able to usefully leverage `#![no_std]` in stable Rust these lang items
+must be available in a stable fashion.
+
+# Detailed Design
+
+This RFC proposes a nuber of changes:
+
+* Tweak the `#![no_std]` attribute slightly.
+* Introduce a `#![no_core]` attribute.
+* Pave the way to stabilize the `core` module.
+
+## `no_std`
+
+The `#![no_std]` attribute currently provides two pieces of functionality:
+
+* The compiler no longer injects `extern crate std` at the top of a crate.
+* The prelude (`use std::prelude::v1::*`) is no longer injected at the top of
+  every module.
+
+This RFC proposes adding the following behavior to the `#![no_std]` attribute:
+
+* The compiler will inject `extern crate core` at the top of a crate.
+* The libcore prelude will be injected at the top of every module.
+
+Most uses of `#![no_std]` already want behavior along these lines as they want
+to use libcore, just not the standard library.
+
+## `no_core`
+
+A new attribute will be added to the compiler, `#![no_core]`, which serves two
+purposes:
+
+* This attribute implies the `#![no_std]` attribute (no std prelude/crate
+  injection).
+* This attribute will prevent core prelude/crate injection.
+
+Users of `#![no_std]` today who do *not* use libcore would migrate to moving
+this attribute instead of `#![no_std]`.
+
+## Stabilization of libcore
+
+This RFC does not yet propose a stabilization path for the contents of libcore,
+but it proposes readying to stabilize the name `core` for libcore, paving the
+way for the rest of the library to be stabilized. The exact method of
+stabilizing its contents will be determined with a future RFC or pull requests.
+
+## Stabilizing lang items
+
+As mentioned above, there are three separate lang items which are required by
+the libcore library to link correctly. These items are:
+
+* `panic_fmt`
+* `stack_exhausted`
+* `eh_personality`
+
+This RFC does **not** attempt to stabilize these lang items for a number of
+reasons:
+
+* The exact set of these lang items is somewhat nebulous and may change over
+  time.
+* The signatures of each of these lang items can either be platform-specific or
+  it's just "too weird" to stabilize.
+* These items are pretty obscure and it's not very widely known what they do or
+  how they should be implemented.
+
+Stabilization of these lang items (in any form) will be considered in a future
+RFC.
+
+# Drawbacks
+
+The current distribution provides precisely one library, the standard library,
+for general consumption of Rust programs. Adding a new one (libcore) is adding
+more surface area to the distribution (in addition to adding a new `#![no_core]`
+attribute). This surface area is greatly desired, however.
+
+When using `#![no_std]` the experience of Rust programs isn't always the best as
+there are some pitfalls that can be run into easily. For example, macros and
+plugins sometimes hardcode `::std` paths, but most ones in the standard
+distribution have been updated to use `::core` in the case that `#![no_std]` is
+present. Another example is that common utilities like vectors, pointers, and
+owned strings are not available without liballoc, which will remain an unstable
+library. This means that users of `#![no_std]` will have to reimplement all of
+this functionality themselves.
+
+This RFC does not yet pave a way forward for using `#![no_std]` and producing an
+executable because the `#[start]` item is required, but remains feature gated.
+This RFC just enables creation of Rust static or dynamic libraries which don't
+depend on the standard library in addition to Rust libraries (rlibs) which do
+not depend on the standard library.
+
+In stabilizing the `#![no_std]` attribute it's likely that a whole ecosystem of
+crates will arise which work with `#![no_std]`, but in theory all of these
+crates should also interoperate with the rest of the ecosystem using `std`.
+Unfortunately, however, there are known cases where this is not possible. For
+example if a macro is exported from a `#![no_std]` crate which references items
+from `core` it won't work by default with a `std` library.
+
+# Alternatives
+
+Most of the strategies taken in this RFC have some minor variations on what can
+happen:
+
+* The `#![no_std]` attribute could be stabilized as-is without adding a
+  `#![no_core]` attribute, requiring users to write `extern crate core` and
+  import the core prelude manually. The burden of adding `#![no_core]` to the
+  compiler, however, is seen as not-too-bad compared to the increase in
+  ergonomics of using `#![no_std]`.
+* Another stable crate could be provided by the distribution which provides
+  definitions of these lang items which are all wired to abort. This has the
+  downside of selecting a name for this crate, however, and also inflating the
+  crates in our distribution again.
+
+# Unresolved Questions
+
+* How important/common are `#![no_std]` executables? Should this RFC attempt to
+  stabilize that as well?
+* When a staticlib is emitted should the compiler *guarantee* that a
+  `#![no_std]` one will link by default? This precludes us from ever adding
+  future require language items for features like unwinding or stack exhaustion
+  by default. For example if a new security feature is added to LLVM and we'd
+  like to enable it by default, it may require that a symbol or two is defined
+  somewhere in the compilation.