Well, I confess that I am really not a pro with these encoding questions, I guess I should have search more before posting here this quick :/
I don't really understood your explanation.
I choose UTF-8 because I thought it was the "universal" encoding solution and it will make things easier than with ISO-8859. I could use a BOM but I don't know if it won't bring new compatibility problems... I guess I should search and try.
The thing is I never had any problems with all my C files in UTF-8 until this release so I suspected it may be a change in it, not saying it's a bug.
And btw, I used special symbols only in comments so my code always compile
Sorry if I irritated you, if you think I'm beeing annoying, tell me and I will search by myself