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That's still the position of Creative Commons:

"Can I apply a Creative Commons license to software?

We recommend against using Creative Commons licenses for software. Instead, we strongly encourage you to use one of the very good software licenses which are already available. We recommend considering licenses made available by the Free Software Foundation or listed as “open source” by the Open Source Initiative. Unlike our licenses, which do not make mention of source or object code, these existing licenses were designed specifically for use with software. Furthermore, most of our licenses are currently not compatible with the GPL, the most frequently used free software license. (We are looking into compatibility of BY-SA with GPL in the future; for more detail, see the compatibility page.)

CC licenses may be used for software documentation, as well as separate artistic elements such as game art or music.

Note that the CC0 Public Domain Dedication is GPL-compatible and acceptable for software. For details, see the relevant CC0 FAQ entry. "