Re: as for Calc and the math library

[Suhail Singh <suhailsingh247@gmail.com>]

Eli Zaretskii <eliz@gnu.org> writes:

> The way we do it when loading modules requires the _loaded_ library to
> declare itself compatible, by exporting a symbol of a certain name.
> That is an action by the library we load, not by the Lisp program
> which loads it.

Thank you for elaborating. In the context of Emacs, having a claim of
GPL compatibility is not sufficient; it also matters who is making such
a claim and asserting compliance with the license terms.

IIUC, the claim has to be made either by the library itself (the case of
modules), or by the Emacs maintainers (the case of an allow-list).
However, a claim made by the user (or a repackager) of a library is
insufficient.  Is my understanding correct?

To test my understanding of the above, as a counterfactual, if there was
a standardized way by which libraries identified their license (perhaps
by exporting a pre-determined symbol containing something like an SPDX
license identifier), that too would have been acceptable as long as
emacs-ffi checked against an allow-list of compatible-with-GPL-licenses.
Is that correct?

-- 
Suhail