(In reply to comment #18)
> On steam, you can select the game, right click on it, select proprieties‎ ,
> launch options and put
> 
> apitrace %command%
> 
> you can run the game with gdb, strace , etc  using this option. it will
> output to the console, so start steam in a terminal if you need to see the
> output

Thanks, but the game simply segfaults when I do this:

Dumped crashlog to
/home/ryan/.local/share/feral-interactive/XCOM/crashes//50524115-5e25-7dad-395afa0f-6f10b83e.dmp
/home/ryan/.local/share/Steam/SteamApps/common/XCom-Enemy-Unknown/binaries/linux/xcom.sh:
line 39: 9211 Segmentation fault (core dumped) ${DEBUGGER} "${GAMEBINARY}" $@
Game removed: AppID 200510 "XCOM: Enemy Unknown", ProcID 9211

Feral have mentioned to me that they're willing to give Mesa/RadeonSI devs
Steam keys to help find and fix the issue, I just need to email them
(http://steamcommunity.com/app/200510/discussions/0/648811852226640080/#c522730701427327317).
If you guys are willing I'll do that.