[SOLVED] Trouble Building Python And Lua Modules

[kabbotta]

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---- Version: 0.8.4 (Build: Mar  8 2015 GNU/Linux g++ 4.9.2 20150204 (prerelease) 32 bit) ----
---- Renderer module is: CEGUI::OgreRenderer - Official OGRE based 2nd generation renderer module. ----
---- XML Parser module is: CEGUI::ExpatParser - Official expat based parser module for CEGUI ----
---- Image Codec module is: OgreImageCodec - Integrated ImageCodec using the Ogre engine. ----
---- Scripting module is: None ----


I've just built CEGUI for use with Ogre, and everything seems to be working alright except that I had to disable the building of the python and lua modules. I am using arch and I already had to redirect cmake to use my python2.7 installation instead of python3. That cleared up some of the issues, but I still get an error while building ToggleButton that looks like this:

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virtual memory exhausted: Cannot allocate memory
cegui/src/ScriptModules/Python/bindings/CMakeFiles/PyCEGUI.dir/build.make:77: recipe for target 'cegui/src/ScriptModules/Python/bindings/CMakeFiles/PyCEGUI.dir/output/CEGUI/ToggleButton.pypp.cpp.o' failed


It's like it is getting stuck in a loop or something. I think I run into a similar problem with the Lua module. Arch defaults to a newer version of Lua than 5.1. I've changed the cmake variables to reflect this, but I still get errors during building about undefined references to 'lua_setglobal'. Could the problem be related to using a newer version of tolua++? The arch repository has 1.0.93-1. I noticed the wiki says it was built with 1.0.61, but I couldn't find that version anywhere. This is the error:

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CMakeFiles/toluappcegui-0.8.dir/tolua.c.o: In function `main':
tolua.c:(.text.startup+0x44): undefined reference to `lua_setglobal'
tolua.c:(.text.startup+0x5e): undefined reference to `lua_setglobal'
tolua.c:(.text.startup+0x84): undefined reference to `lua_setglobal'
tolua.c:(.text.startup+0xa8): undefined reference to `lua_setglobal'
tolua.c:(.text.startup+0x1df): undefined reference to `lua_getglobal'
tolua.c:(.text.startup+0x1e9): undefined reference to `lua_rawlen'
collect2: error: ld returned 1 exit status
cegui/src/ScriptModules/Lua/support/tolua++bin/CMakeFiles/toluappcegui-0.8.dir/build.make:113: recipe for target 'bin/toluappcegui-0.8' failed
make[2]: *** [bin/toluappcegui-0.8] Error 1
CMakeFiles/Makefile2:752: recipe for target 'cegui/src/ScriptModules/Lua/support/tolua++bin/CMakeFiles/toluappcegui-0.8.dir/all' failed


[lucebac]

virtual memory exhausted: Cannot allocate memory
cegui/src/ScriptModules/Python/bindings/CMakeFiles/PyCEGUI.dir/build.make:77: recipe for target 'cegui/src/ScriptModules/Python/bindings/CMakeFiles/PyCEGUI.dir/output/CEGUI/ToggleButton.pypp.cpp.o' failed

This says that you don't have enough RAM to build the python modules, it has nothing to do with CEGUI itself.

[Ident]

How much RAM did you approx. have free at that point, kabbotta?

[dermont]

As lucebac says you don't have enough memory and/or swapspace. Run the following and let us know the total memory and swap on your system.

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grep MemTotal /proc/meminfo
grep SwapTotal /proc/meminfo
## to get swap partition
swapon -s


If you can't change the size of your swap partion, you should be able to do so by creating a temp swap file. I've done this in the past running Swig on machines encountering the same problems. It will probably be slow but see the following links.

http://www.akadia.com/services/ora_linu ... l_10g.html (Checking Memory and Swap space)
http://www.linux.com/learn/tutorials/44 ... -swap-file

Then removing the swap space after you finish:

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swapoff tmpswp
rm tmpswp


[kabbotta]

Thanks, guys! Creating a temporary swap space allowed the python module to be built successfully. I was so caught up in the version issues with python that I didn't even think about taking the error at face value as a legitimate memory problem. I still get the same errors about not being able to find 'lua_setglobal' when trying to build the lua module, but now that I've got the python module built, I pretty much consider this solved. Thanks, again! The ogre and cegui forums have been very helpful.

For reference, I had 2gb of RAM available and no swap setup when I ran into the error. Adding a 1gb swap space allowed the build to finish (albeit a little slowly).

[lucebac]

Glad to hear that you were finally able to build CEGUI!
Just FYI: swap space is HDD space. Therefore reading from/writing to it is slower than actual RAM space.

[kabbotta]

I've discovered that it was the lua generator that was seeing the undefined reference to 'lua_setglobal'. When I disabled that, I was also able to successfully build the lua module. So everything appears to be cleared up.