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Re: framework

From: Saso Kiselkov
Subject: Re: framework
Date: Fri, 28 Aug 2009 09:30:02 +0200
User-agent: Thunderbird (X11/20090817)

Hm, right, I had forgotten about that one.


David Chisnall wrote:
On 27 Aug 2009, at 11:12, Saso Kiselkov wrote:

In other words, you'll have to use GPL for your app. Remember, that GPL linking requirements only work from library -> app, i.e. if you link to a GPL library, your app has to become GPL. If, however, your app is GPL and you link to a non-compatible/proprietary library, that doesn't force the library to become GPL. As an example, consider compiling a GPL app against Solaris' proprietary libc - that doesn't force the libc to become GPL. That means, you don't have to remove the NVIDIA Cg dependency if you don't want to.

This is not the case. You may link a GPL'd application against Solaris' or Windows' libc because there is an explicit exemption in the GPL for system libraries. From clause 3:

However, as a special exception, the source code distributed need not include anything that is normally distributed (in either source or binary form) with the major components (compiler, kernel, and so on) of the operating system on which the executable runs, unless that component itself accompanies the executable.

This clause would not apply to Cg, for example, because it is not usually shipped with an OS. Is PRNG an important dependency? If you could make it optional and fall back to the standard C/POSIX pseudorandom number functions then this would make your life, and the lives of people wanting to use your code, simpler.

If you are linking against a GPL'd framework, you do not have to make your code GPL'd, you have to release your code under a GPL-compatible license. The final product (your library, the application it links against, and so on) must be distributed under the GPL.

Thomas, please read the relevant licenses before you make a decision. The world would be a much better place if people read FSF licenses before releasing code under them.


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