If CDDL has no issue with GPL conditions, then follow the GPL and everything is fine.
CDDL has this text: "Any Covered Software that You distribute or otherwise make available in Executable form must also be made available in Source Code form and that Source Code form must be distributed only under the terms of this License"
So you take some CDDL code, and some GPL code, and you put that whole new source code tree under GPL in order to fullfill the GPL license condition. Are you then in compliance with the CDDL code? My concussion is that you are not, as that would be in conflict with the above condition of the CDDL. The source code tree would not be "distributed only under the terms of this license".
I take a CDDL licensed source code file. I take a GPL licensed source code file. I add inline the GPL licensed code to the CDDL licensed file, and release an executable form of the result. In order to comply with the GPL I then give out a single source code file under the GPL license terms with the code from the two files.
Is this in compliance with the CDDL terms and conditions?
CDDL has this text: "Any Covered Software that You distribute or otherwise make available in Executable form must also be made available in Source Code form and that Source Code form must be distributed only under the terms of this License"
So you take some CDDL code, and some GPL code, and you put that whole new source code tree under GPL in order to fullfill the GPL license condition. Are you then in compliance with the CDDL code? My concussion is that you are not, as that would be in conflict with the above condition of the CDDL. The source code tree would not be "distributed only under the terms of this license".