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Re: IDL performance and FFTs (was: call external speed) [message #12854]

Thu, 17 September 1998 00:00

stevenj
Messages: 5
Registered: September 1998

Junior Member

David Kastrup <dak@mailhost.neuroinformatik.ruhr-uni-bochum.de> wrote:
> Karl Krieger <kak@ipp.mpg.de> writes:
>
>> BTW: I very much doubt if it's against the GPL to distribute code,
>> which refers to subroutine libraries under GPL as long as I do not
>> include these routines or a compiled binary.
>
> If the interface is unique to the GPL software, you are creating a
> derived work, as it is of no use without the GPL binary and is
> intended to link with it. The interface itself, however, is usually
> not considered copyrightable. So if you distribute a lousy
> implementation of fftw with the same interface along with your wrapper
> routines, one would have problems suing you in court.

That is an interesting point. Actually, you don't have to create a lousy
implementation of FFTW. Versions of FFTW prior to 1.3 were not
distributed under the GPL, but rather were free for non-commercial use.
These versions used a subset of the current interface. So, as long as you
stick to the 1.2 interfaces, I suppose you could argue that you are not
creating a derived work of the GPL'ed versions. You still wouldn't be
able to distribute something linked with the GPL'ed versions, though.

Cordially,
Steven G. Johnson

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[Message index]

		Re: IDL performance and FFTs (was: call external speed) By: stevenj on Thu, 17 September 1998 00:00
		Re: IDL performance and FFTs (was: call external speed) By: menakkis on Thu, 17 September 1998 00:00
		Re: IDL performance and FFTs (was: call external speed) By: David Kastrup on Thu, 17 September 1998 00:00
		Re: IDL performance and FFTs (was: call external speed) By: Karl Krieger on Thu, 17 September 1998 00:00
		Re: IDL performance and FFTs (was: call external speed) By: steinhh on Thu, 17 September 1998 00:00
		Re: IDL performance and FFTs (was: call external speed) By: stevenj on Wed, 16 September 1998 00:00
		Re: IDL performance and FFTs (was: call external speed) By: roy.hansen on Wed, 16 September 1998 00:00
		Re: IDL performance and FFTs (was: call external speed) By: Liam Gumley on Wed, 16 September 1998 00:00
		Re: IDL performance and FFTs (was: call external speed) By: steinhh on Wed, 16 September 1998 00:00

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