Re: Add memcpy support for SPARC

[Eric Blake <eblake at redhat dot com>]

On 05/24/2018 02:09 PM, Aditya Upadhyay wrote:
> Hi Developers,
>
> Is this ok to add memcpy implementation from Open Solaries?
>
> https://bitbucket.org/a3217055/illumos-gate-import/src/741592a55c4c9746705ce0fd9232f5acded43ed0/usr/src/lib/libc/sparc/gen/memcpy.s?at=default&fileviewer=file-view-default

That uses the CDDL license.  Nothing else in newlib does.

The FSF claims CDDL and GPL are incompatible; others refute this claim 
(such as 
https://opensource.stackexchange.com/questions/2094/are-cddl-and-gpl-really-incompatible), 
but I'm not a lawyer to say who is right.  At any rate, given the 
controversy, my gut feel is that you should NOT copy any CDDL code into 
newlib, unless YOU provide the lawyers to back up your claim.

> If yes, then Could you please tell us rules about modifying the
> Licance of third party code?

I _do_ know that you CANNOT modify the existing license on ANY file that 
you are importing from a third party, since you are not the license 
holder (some permissive licenses allow you to relicense code under a 
more restrictive license of your choice, which is different from 
modifying the existing license - but I doubt CDDL falls into that 
category).  And of course, using that code without copying the license 
statement is a bad idea.

So that probably means using OpenSolaris code as your base point is a 
bad idea.

--
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
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