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Re: Add memcpy support for SPARC
On Thu, May 24, 2018 at 4:43 PM, Joel Sherrill <joel@rtems.org> wrote:
> On Thu, May 24, 2018, 2:19 PM Eric Blake <eblake@redhat.com> wrote:
>
>> 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.
>>
Regardless of the incompatibility question of CDDL with GPL, since
CDDL is not used anywhere in newlib, it would seem wise to avoid it.
(I don't trust any License that is longer than a page, regardless of
what anyone's lawyer says.)
>> > 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.
>>
>
> Ok. Since you and Corinna disagree, let's be safe. Do you have another
> source for an acceptablely licensed SPARC V7 mem* and str*?
>
My experience has been that netbsd has the best liberally licensed
sparc-v7 code base among general purpose OS (outside of Sun
derivatives). If you did not succeed there, you probably have to roll
your own.
Gedare