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Update licensing to MIT AND Apache-2.0 WITH LLVM-exception
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Currently, Cargo.toml specifies Apache-2.0 OR MIT, but LICENSE.txt
describes MIT OR NCSA. compiler-builtins is derived from LLVM's
compiler-rt. LICENSE.txt correctly reflects the state of compiler-rt
prior to relicensing on 2019-01-19, during which time software was
available for use under either MIT or the University of Illinois NCSA
license. After relicensing, however, compiler-rt is available for use
only under Apache-2.0 with the LLVM exception; this is not reflected
anywhere in the repository.

Update the SPDX license identifier to `MIT AND Apache-2.0 WITH
LLVM-exception AND (MIT OR Apache-2.0)`. Each AND portion covers
something specific:

* Apache-2.0 WITH LLVM-exception: this covers work that is derived from
  the LLVM repository since after the LLVM relicensing.
* MIT: This covers work that is derived from LLVM before the LLVM
  relicensing (under MIT OR NCSA), as well as the vendored `libm`
  components.
* MIT AND Apache-2.0: This ensures that any contributions to this
  repository, in addition to meeting the above required licenses, is
  also released for use under the Rust-standard Apache-2.0 with no LLVM
  exception.

See also the parallel license update in rust-lang/libm [1].

Fixes: #307
Closes: #511
Link: https://rust-lang.zulipchat.com/#narrow/channel/335408-foundation/topic/Request.20for.20legal.20team.20input.20on.20crate.20licensing
Link: rust-lang/libm#317 [1]
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tgross35 committed Oct 26, 2024
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2 changes: 1 addition & 1 deletion Cargo.toml
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authors = ["Jorge Aparicio <japaricious@gmail.com>"]
name = "compiler_builtins"
version = "0.1.135"
license = "MIT/Apache-2.0"
license = "MIT AND Apache-2.0 WITH LLVM-exception AND (MIT OR Apache-2.0)"
readme = "README.md"
repository = "https://github.com/rust-lang/compiler-builtins"
homepage = "https://github.com/rust-lang/compiler-builtins"
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317 changes: 248 additions & 69 deletions LICENSE.txt
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==============================================================================
compiler-builtins License
==============================================================================
compiler-builtins as a whole is available for use under both the MIT license
and the Apache-2.0 license with the LLVM exception (MIT AND Apache-2.0 WITH
LLVM-exception).

The compiler-builtins crate is dual licensed under both the University of
Illinois "BSD-Like" license and the MIT license. As a user of this code you may
choose to use it under either license. As a contributor, you agree to allow
your code to be used under both.
As a contributor, you agree that your code can be used under either the MIT
license, or the Apache-2.0 license, or the Apache-2.0 license with the LLVM
exception.

Full text of the relevant licenses is included below.
Text of the relevant licenses is provided below:

==============================================================================
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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Portions of this software are derived from third-party works licensed under
terms compatible with the above Apache-2.0 WITH LLVM-exception AND MIT
license:

* compiler-builtins is derived from LLVM's compiler-rt (https://llvm.org/).
Work derived from compiler-rt prior to 2019-01-19 is usable under the MIT
license, with the following copyright:

Copyright (c) 2009-2016 by the contributors listed in CREDITS.TXT

The relevant CREDITS.TXT is located at
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* Work derived from compiler-rt after 2019-01-19 is usable under the
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* The bundled `math` module is from rust-lang/libm, usable under the MIT
license. See https://github.com/rust-lang/libm for details.

Additionally, some source files may contain comments with specific copyrights
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