> I assume Apple had signed a copyright assignment to the FSF for all > changes to GCC, moreover I checked > the modified GCC source code that Apple distributes and all the > copyright notices on all files mention the > "Free Software Foundation Inc." as the copyright holder. > > I guess that means the changes have already been assigned to the FSF > and we're free to merge ? :-)
The copyright notice on the files has no legal significance. You need to make sure that: (1) There is a copyright assignment on file. (2) You get the files from Apple directly in a way that makes it clear that the assignment applies to those files.