Solution to slow compilation speed of Xcode

Recently, when developing a large project, I encountered a headache , Due to the large number of project codes , Compile links every time 1 About minutes , Debugging is a waste of time , So I studied how to improve the speed of compiling links , Share it here .

There are three main ways to improve the speed of compiling Links ：

1. Improve XCode Number of threads used at compile time

defaults write com.apple.Xcode PBXNumberOfParallelBuildSubtasks 4

XCode The default usage is CPU The same number of cores , But because of the IO Operation is often better than CPU More operations , Therefore, appropriately increasing the number of threads can speed up the compilation speed to a certain extent . I use 4 Nuclear CPU, Change the number of threads to 8 The post compilation speed is slightly improved .

2. take Debug Information Format Change it to DWARF

In the project corresponding to Target Of Build Settings in , find Debug Information Format This one , take Debug At the time of the DWARF with dSYM file Change it to DWARF.

This item sets whether to add debugging information to the executable file , Change it to DWARF after , If the program crashes , The function stack corresponding to the crash location will not be output , But because of Debug In mode, you can XCode View debugging information in , So instead of DWARF It doesn't matter much . After this change , It can greatly improve the compilation speed .

3. take Build Active Architecture Only Change it to Yes

In the project corresponding to Target Of Build Settings in , find Build Active Architecture Only This one , take Debug At the time of the No Change it to Yes.

This item sets whether to compile only the version of the current schema , If No, Will compile versions of all schemas . It should be noted that , This option in the Release Mode must be Yes, Otherwise, it will be published ipa Will not work on some devices . After this change , It can significantly improve the compilation speed .

After setting the above three items , Compile time from 1 Minutes or so to 10 About seconds , Therefore, the effect is quite obvious .