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If we ignore the fact that incomplete pre-release test softwares usually have significantly more bugs which can also make them run significantly slower: Are these official Daily builds (14.04 test builds from the Ubuntu servers) compiled with the same optimization level as the official Stable releases, or are they compiled with every optimizations turned off and debugging turned on instead (something like an -Od CFLAG instead of -O2 when I compile a user software with GCC)?

So, should the last stable release run any faster (not just more reliable) than the latest Daily build (apart from any random bugs which might effect the performance as well as any new code improvements which might improve it...)?

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I assume that the software is just build with the makefiles of the software, therefore the build flags depend on the packages. –  queueoverflow Dec 29 '13 at 18:28
    
I am not familiar with operating system compiling methods (hence the original question), but don't makefiles usually support both "debug" and "release" presets (which you can choose from when you start make)? –  Tóth F. János Dec 29 '13 at 21:09
    
Depends on the makefile. My makefiles do not have any of this, but my programs are mostly scripts, not compiled programs. The operating system is just a bunch of packages, so there is nothing special about them, really. Coreutils are just C programs, that get compiled. –  queueoverflow Dec 30 '13 at 22:06

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