Re: License analysis for static linking

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* Björn Persson:

> Florian Weimer wrote:
>> I could be persuaded by an argument along these lines: The Rust and Go
>> cases are different because for its Rust and Go dependencies, there
>> would not be a trace in the installed system of the licenses of those
>> source-only dependencies.
>
> That can also be the case with static libraries in other languages, and
> so-called header-only libraries in C++. I always found it strange that
> the license field policy singles out Rust, as I don't see how static
> Rust libraries are legally different from other static libraries.

Right.

> In cases where a library (in C or whatever) is packaged in both shared
> and static forms, installing a statically linked program won't pull in
> any library package. The shared library package with the license may or
> may not be present depending on what else is installed.

Yes, but that doesn't apply to the three libraries I listed.

>> The situation with glibc, libgcc and libstdc++ is different because they
>> are also installed separately, so their license information is always
>> part of the installation.
>
> Because the statically linked code is only a part of the library, and
> the rest of the library is dynamically linked and thus pulled in as a
> package with a license field? It seems to me that that argument would
> also apply to inlined subroutines, generics, templates and similar code
> snippets that get compiled into the using program. I believe many shared
> libraries have such inlined snippets, and my impression is that they're
> usually not reflected in the license field of programs that use the
> library.

Yes, that would be effective licensing analysis, and it would need
toolchain support for correctness and efficiency.

Thanks,
Florian
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