License of xcharconv_ryu.h header

[garazdawi]

Hello!

I would like some clarification about what the the license of https://github.com/microsoft/STL/blob/main/stl/inc/xcharconv_ryu.h is. The comments on the top lists both Apache-2.0 WITH LLVM-exception and BSL-1.0, but the SPDX-License-Identifier is only Apache-2.0 WITH LLVM-exception.

So my question is whether the code in that file is licenses under Apache-2.0 WITH LLVM-exception OR BSL-1.0 or Apache-2.0 WITH LLVM-exception AND BSL-1.0? Or are the snippets that are licensed under Boost and other under Apache W LLVM? I've assumes that it is Apache-2.0 W LLVM OR BSL-1.0 as that is what Ulf Adams original uses, but it would be good to make that clear.

The reason I'm asking these very boring questions is because we (The Erlang/OTP project ) are in the process of cleaning up/restructuring our own license handling and we have a version of your __to_chars in our code base and want to know what licenses apply.

[StephanTLavavej]

I'll create a PR to update this.

[StephanTLavavej]

Upon thinking about this further, I believe that AND is the correct operator for us. (Note that I am not a lawyer, or a cat.)

Upstream Ryu is dual-licensed under Apache 2.0 (notably without the LLVM Exception) or Boost 1.0. (This OR is very clear in the project's README, even though it isn't written in SPDX syntax.) We chose to use it under the Boost Software License due to its explicit lack of attribution requirements when shipping compiled software to end users (who don't even know what a C++ Standard Library is).

Our Ryu-derived source code (extensively altered by me and later maintenance) must continue to comply with the BSL-1.0, but we also want Apache 2.0 with the LLVM Exception to cover the codebase (which has the same kind of attribution exemption). The AND operator should reflect this. We believe the licenses are highly compatible so complying with both simultaneously is easy.

[garazdawi]

Your reasoning sounds good to me, but I am not a lawyer either and have many times been surprised that logic and laws don’t always agree :)

We did originally set the license to AND to be conservative before asking you.