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What strategies can be used in general to decrease build times for any Xcode project? I'm mostly interested in Xcode specific strategies.
I'm doing iPhone development using Xcode, and my project is slowly getting bigger and bigger. I find the compile / link phases are starting to take more time than I'd like.
Currently, I'm:
Using Static Libraries to make it so most of my code doesn't need to be compiled everytime I clean and build my main project
Have removed most resources from my application, and test with a hard coded file system path in the iPhone simulator whenever possible so my resources don't have to constantly be packaged as I make changes to them.
I've noticed that the "Checking Dependencies" phase seems to take longer than I'd like. Any tips to decrease that as well would be appreciated!
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Xcode has inbuilt features that allow you to identify functions and expressions that are causing longer compile times. You can specify a compile time limit and identify areas in your codebase that exceed this limit. Open up your project's build settings and add the following flags to your Other Swift Flags .
If you use Xcode, Product->Perform Action->Build With Timing Summary . And see building time summary in the Xcode building log.
Often, the largest thing you can do is to control your inclusion of header files.
Including "extra" header files in source code dramatically slows down the compilation. This also tends to increase the time required for dependency checking.
Also, using forward declaration instead of having headers include other headers can dramatically reduce the number of dependencies, and help all of your timings.
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I wrote an extensive blog post about how I improved the iOS development cycle at Spotify:
Shaving off 50% waiting time from the iOS Edit-Build-Test cycle
It boiled down to:
1) Stop generating dSYM bundles.
2) Avoid compiling with -O4 if using Clang.
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