Quoting Basile STARYNKEVITCH <bas...@starynkevitch.net>:
I would imagine that patching GNU indent (in its source code form) requires a copyright assignment specific to it (and uncovered by a, or at least "mine", GCC copyright assigment to FSF). If this is the case, I [Basile] won't do it (because getting a copyright assignemnt is so painful to me).
If you put a patch against GNU indent in contrib to format GCC-style, wouldn't that then be a part of GCC and thus covered? If that is the case, then you can post afterwards this piece of FSF-owned GCC code to the indent maintainers...