Version:           3.2.1 (using KDE KDE 3.4.1)
Installed from:    Gentoo Packages
Compiler:          3.4.3 
OS:                Linux

Literal strings which continue over more than one line get "formatted".

Example:

void blah() {
    printf("\
left aligned line1\n\
left aligned line2\n"
          );
}

becomes

void blah() {
    printf("\
            left aligned line1\n\
            left aligned line2\n"
          );
}

Admittedly, this looks more appealing, but the content of the string has changed, and so this compiles to a different program.

IMHO, a Source Formatter must never change the program, only the source.