steam: added libcxxabi workaround

[yochai]

Changes tested on unstable 68bd8e4M and they work to allow launching Sid Meier's Civilization V.

[chris-martin]

Have you managed to get Civ 5 fully working? I just pulled this commit into my build based on nixos-15.09, and it fixes the immediate crash - But now it just spends some time on the first loading screen and then crashes.

[chris-martin]

Nevermind, not sure what caused that crash but it's working now. Thanks for providing this fix!

[jagajaga]

Sorry, I have to revert this commit, because with it I can't play some games (dota 2, team fortress 2). I have the same issue as @chris-martin (game starts and crashes).

[jagajaga]

e822dfd

[yochai]

@jagajaga @chris-martin mentioned that it's working for him. Can you please send the crash logs ?

[jagajaga]

@yochai http://sprunge.us/AWbJ

[yochai]

@jagajaga removing the libstdc++.so export (on master's version) from the chrootenv allows to play both dota 2 and civ 5, can that export be made optional ?

[jagajaga]

@yochai removing libc++abi.so helped me, not libstdc++.so.

[jagajaga]

cc @abbradar

[yochai]

@jagajaga we had a misunderstanding, locally I can play both dota 2 and civ 5 when libstdc++.so and libc++abi.so are not being exported. libstdc++.so is being exported as a workaround for an issue that doesn't effect everyone, but this export breaks Civ 5.
If the libc++abi.so export is removed and the libstdc++.so export is made optional, those who are not effected by this bug will be able to play Civ 5.

[jagajaga]

You mean that we need to unimport libstdc++.so? Well, let's wait for @abbradar's comments.

[jagajaga]

@abbradar

[abbradar]

Well, as far as I remember libstdc++ is needed for FOSS drivers only -- optional support would indeed be better if it can give breakage However I think it would be nicer to move this work on top of #8299 -- it can potentially fix lots of other things (and without LD_PRELOADs!). Would you mind?