https://bugs.winehq.org/show_bug.cgi?id=38327
--- Comment #2 from Sergey Isakov isakov-sl@bk.ru --- (In reply to Matteo Bruni from comment #1)
Those values are not really used so it doesn't matter in practice. I don't get those warnings, what compiler / version are you using?
Apple's gcc-4.2.1 with -Os optimization. Without optimization there are no such warning. (?) Anyway those values are influences on inverted matrix. If you want I can write invert_matrix_4x4.