GCC5 optimization level causes runtime error in WINE

[Michael Cronenworth <mike@xxxxxxxxxx>]

Hello,

I am attempting to debug why WINE[1], when compiled with GCC 5[2] on Fedora Rawhide, 
cannot run when an optimization level is specified.

-O0 : works
-O1 : segfault
-O2 : segfault

I have enabled -O1 flags manually and WINE works. What other settings is GCC 5 
enabling between optimization levels? I have run -Q --help=optimizers and that's 
what I based my flag settings on, but there is something obviously missing that -O1 
enables.

Thanks,
MIchael

[1] https://www.winehq.org/
[2] gcc (GCC) 5.0.0 20150226 (Red Hat 5.0.0-0.18)