LICENSE.txt

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).

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.

Text of the relevant licenses is provided below:

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MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
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                                 Apache License
                           Version 2.0, January 2004
                        http://www.apache.org/licenses/

    TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION

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---- LLVM Exceptions to the Apache 2.0 License ----

As an exception, if, as a result of your compiling your source code, portions
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In addition, if you combine or link compiled forms of this Software with
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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
  https://github.com/llvm/llvm-project/blob/main/compiler-rt/CREDITS.TXT.

* Work derived from compiler-rt after 2019-01-19 is usable under the
  Apache-2.0 license with the LLVM exception.

* 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
or licenses.