Hi Francesco,
I have NMUed gramophone2 to delayed=15 to fix bug #1096770.
You can find a patch fixing this issue in Git at
https://salsa.debian.org/debian/gramophone2/-/blob/master/debian/patches/gcc-15.patch?ref_type=heads
Since I usually upgrade d/watch to version=5 and convert d/copyright to
DEP5 I opened two according bugs since I was told NMUs should be bug
driven and its not clear whether these changes might fall under
"generally considered acceptable" since not explicitly mentioned in
developers reference. Please let me know what you think about filing
bugs about such issues in the first place. This might help me starting
an according discussion.
For your convenience you can find all changes of the NMU in Git at
https://salsa.debian.org/debian/gramophone2
Kind regards
Andreas.