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Ghast5 years ago

Thank you both for your help here! Based on this blog (section 3, "What if I need a (more) recent compiler?") it sounds like the problem is that the game is packaged with a version of libstdc++.so that's too old for your OpenGL instances to use - causing the program to crash.

I will try to upload a new Linux version today that doesn't include libstdc++.so, which should cause the game to use the system's version of that library instead and prevent this issue moving forward. (I think it's safe to assume there will always be a libstdc++ on people's systems if they have OpenGL...). In the meantime, the LD_PRELOAD workaround seems like the best option (thanks @espr, you're a lifesaver).

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Ghast5 years ago

I've uploaded a new Linux build titled "Skeletris for Linux (experimental build, 64-bit)" that doesn't include the libstdc++.so.6 library, so I think the game will work properly if you try using that version instead. I may also move this thread into a dev log because it's so huge. Thanks again.

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ErwinJunge5 years ago

Thanks for the quick update. I've tested the experimental build and that works. I've also played a couple of rounds in the game, which is great :)

Just one remaining issue: I don't have any sound. The only line in the log that stood out to me as being related to sound is this one:

ALSA lib pcm.c:8545:(snd_pcm_recover) underrun occurred

Any thoughts on how to debug this? :)

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Ghast5 years ago (2 edits)

I'm glad the build works!

I'm sad the sound doesn't :(

The game is just using the regular pygame api for sound so I'm not sure where to start really. It could be the same issue as before, where some older dependency is being used instead of a newer one your system is expecting, or maybe your system wants to use PulseAudio instead of ALSA, or something else entirely. I'm not really sure.

That log line is interesting, but I suspect it's a symptom of some root audio issue rather than the cause. Looks like the audio buffer isn't being passed as much data as it's supposed to be.

If you're really curious you could try downloading some other pygame games and see if the sound works properly on those - I suspect it won't but you never know.

I think the real answer here though is that I shouldn't have assumed that testing on Ubuntu alone would be enough to clear this for a general "Linux" release, so I'm sorry about that. Moving forward I'll probably label these builds as Ubuntu specifically until I have more of my own machines to test on. Sorry for all the trouble.

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ErwinJunge5 years ago

No need to be sorry! I'm already super happy with the support you're giving.

I'll go play around a bit with pygame stuff and see if I can find anything. I'll let you know if I do. Perhaps together we can expand Ubuntu back into "general Linux" :)

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ErwinJunge5 years ago

Hi again. I've got sound!

Similar issue to libstdc++ I think. LD_PRELOAD=/usr/lib/libSDL.so ./Skeletris works. Can you make a build with the same trick you used for libstdc++ and apply it to libSDL?

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Ghast5 years ago

Oh nice! That's quite interesting. SDL is essentially the core dependency of pygame - so I don't think it's a good idea to swap it out for a different version on the fly like that. It could cause pygame to crash in bizarre ways at runtime if it ever tries to call a method or something that differs between the two versions.

And actually now that I'm reading the pygame wiki, it's become apparent that there are different pygame packages for the different families of linux distros... which is probably why nothing is working correctly... so that's my bad.

In terms of what to do next... I don't think there actually is a legitimate way for me to build the game on my machine (Mint) in a way that will run correctly on Arch. Even beyond libSDL and libstdc++ I don't think it's safe to assume that any of the dependencies will be 100% compatible.

If you want a real, totally functional build, you'd probably need to download the source code, install the Arch versions of all the dependencies, and build it yourself. I'm thinking this is probably more trouble than it's worth though. The game is about an hour long, after all haha.

And thanks for your dedication! You've gone way above and beyond what I'd expect from a player to help me fix this and I've learned a lot about Linux + pygame distribution in the meantime so I really appreciate it. On my next game I promise I will try to find an Arch machine that I can use to distribute it properly!

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ErwinJunge5 years ago

Thanks for the prompt reply. I've also learned a lot of things along this little debugging journey we took :) I completely understand that we should probably stop here. Using LD_PRELOAD is good enough for my usecase and other Arch users will probably find this thread.

Regarding compatibility for future game projects: feel free to hit me up if you need testing on an Arch machine :)

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Ghast5 years ago

Awesome, thanks! I may take you up on that offer :)

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