Re: Can I use CRoaring library in Git?

[Kaartic Sivaraam <kaartic.sivaraam@gmail.com>]

On 16-07-2022 21:56, Abhradeep Chakraborty wrote:
> On Sat, Jul 16, 2022 at 7:50 PM Ævar Arnfjörð Bjarmason
> <avarab@gmail.com> wrote:
>>
>> Another possibility is to get the library to dual-license itself,
>> running "git shortlog -sn" on it it seems it's mainly written by one
>> contributor, with a relatively short tail of others, perhaps they'd be
>> willing to dual-license at the prospect of having git use it?
> 
> Kaartic suggested the same and it seems better than the previous one.
> 
> As a side note, the current EWAH implementation is also relicensed[1]
> to make it compatible with Git. As these two are mainly written by the
> same person, I think he will help us this time also.
>

The EWAH case is a bit different. The original EWAH implementation
[ewah-cpp] was in C++. It was then ported to C [ewah-c] by Git
contributors [ewah-git]. The ported version has been relicensed under
GPLv2 with Deniel Lemire's permission.

The case with CRoaring is that the implementation already exists in C
[croaring] and that is the one which is licensed under Apache V2. I'm
not sure how relicensing works for already existing code.

I suppose we could enquire Daniel Lemire about using the Apache licensed
code for Git. Let's hope for the best.


[[ References ]]

[ewah-cpp]: https://github.com/lemire/EWAHBoolArray

[ewah-c]: https://github.com/vmg/libewok
 [ewah-git]: The initial commit of 'ewah' directory mentions the
    relicensing:

    e1273106f6 (ewah: compressed bitmap implementation, 2013-11-14)

[croaring]: https://github.com/RoaringBitmap/CRoaring

> Thanks!
> 
> [1]  https://github.blog/2015-09-22-counting-objects/#footnote-1

--
Sivaraam