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Building using CMake: Difference between revisions
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(Switch to {{flightgear url}} to fix the broken Gitorious link. And usage of {{flightgear clone}} and {{simgear clone}} to abstract the repository cloning.) |
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* '''-DJPEG_FACTORY=ON''' (enable jpeg support) | * '''-DJPEG_FACTORY=ON''' (enable jpeg support) | ||
* '''-DENABLE_FLITE=ON''' (enable FLITE TTS-based ATIS) [http://sourceforge.net/p/flightgear/mailman/message/32265565] [{{flightgear url|commit=cadb77b18d13bb0d45672ac607801bda222454e9}}] | * '''-DENABLE_FLITE=ON''' (enable FLITE TTS-based ATIS) [http://sourceforge.net/p/flightgear/mailman/message/32265565] [{{flightgear url|commit=cadb77b18d13bb0d45672ac607801bda222454e9}}] | ||
== LTO == | |||
Erik has tried to compile Simgear and FlightGear using 'gcc -flto' to see if he could squeee just a bit more performance out of the code. | |||
To be able to do so he's run cmake for both Simgear and FlightGear as follows: | |||
<pre> | |||
cmake -DCMAKE_AR=/usr/bin/gcc-ar \ | |||
-DCMAKE_RANLIB=/usr/bin/gcc-ranlib \ | |||
-DCMAKE_NM=/usr/bin/gcc-nm \ | |||
-DSIMGEAR_SHARED=1 \ | |||
-DCMAKE_BUILD_TYPE=Release \ | |||
-DCMAKE_CXX_FLAGS:STRING="-Os march=native -mtune=native -msse3 -mfpmath=sse -flto" | |||
</pre> | |||
After applying one patch to SimGear he got it compiling. | |||
The resulting binary is almost exactly 5Mb smaller: | |||
* 14390984 fgfs-lto | |||
* 19354528 fgfs | |||
It did not alter the frame-rates much for him (he's got quite a decent videocard now with the GeForce GTX 750) but Erik did have the distinct feeling there were way less small-pauses/frame-rate glitches when compared to the regular build. The overall feeling was much smoother.<ref>{{cite web | |||
|url = https://sourceforge.net/p/flightgear/mailman/message/35478384/ | |||
|title = <nowiki> [Flightgear-devel] Link Time Optimization </nowiki> | |||
|author = <nowiki> Erik Hofman </nowiki> | |||
|date = Nov 8th, 2016 | |||
|added = Nov 8th, 2016 | |||
|script_version = 0.40 | |||
}}</ref> | |||
== XCode == | == XCode == | ||