![]() I'm just stating this because I changed it because I was willing to try anything. (I don't think this is necessary, and it shouldn't have any effect in my own project. Set the build setting for prefix header sharing to "Yes".(For me, this and step 1 were one and the same.) Remove any imports from the prefix header that use Clang modules (libraries or frameworks that have a module.modulemap file in their Headers directory, so you can write code like MyModule).Be sure it is not indirectly imported through other imports as well. ![]() Remove any imports from the prefix header that are files from the built products directory so you can change the build setting for this ("Precompiled Header Uses Files From Build Directory") to "No".If you don't have a prefix header set, then I guess this isn't the problem (or the problem is multifaceted). I don't know which one actually did the trick, but I'll share them all in hopes that it helps someone else out there. I changed a few things with my code regarding the prefix header that seem to have fixed this problem. Note: I do not have the custom user-defined setting for whole module optimization. Build Settings -> HEADERMAP_USERS_VFS = YES.Build Settings -> Enable Incremental Distill = YESĪdded custom User-Defined build settings,.Build Settings -> Increase Sharing of Precompiled Headers = YES.Build Settings -> Optimization Level (Release) = Fastest, Smallest.Build Settings -> Optimization Level (Debug) = None.Build Settings -> Link-Time Optimization = Incremental.Schema -> Build -> "Find Implicit Dependencies" = TRUE.I suggest you give it a try and see how it works for you. So far I'm getting the best results with the following settings. Like many of you I'm working on a large swift 4/cocoapods project with many source files and re-compiling every file every time is infuriating. Still has been a constant issue for me with Xcode 9. There are some other good suggestions in this link including code refactoring, Now I use the Single File compilation method for fast incremental debug builds. No longer does Xcode decide to recompile unnecessary files when I do a build. By moving that code into a separate target within my project and importing it as a module I was able to greatly improve compilation times. Specifically modularizing the ORM layer which is used in almost every other class. The single biggest improvement I was able to make was modularizing my project. Point Xcode did not migrate the library project settings correctly and Previously the standard was GNU99 but now its not. The "C Language Dialect" was set to "GNU99" instead of "Compilerĭefault". "Build Setting" tab -> "C Language Dialect" -> Change it to "Compiler Default". Xcode will not rebuild an entire target when only small.You can give it a try (download Xcode8.2 beta2 here) This issue seem resolved with Xcode 8.2 (beta 2).īut for me its not be resolved, i face this issue even when i use Xcode 8.2. This issue has not been resolved at Xcode 8.2.Ītom to code and command line to build and debug is my choice now. Regular builds are also much faster and very noticeable after doing a Product > Clean.This issue has not been resolved at Xcode 8.2.1 (for my project) I was skeptical, but it definitely works.īuilding and running an app I'm currently working on into a clean iOS Simulator used to take 20 seconds. I didn't go the Terminal route but instead used iRamDisk from the Mac App Store. If you have extra memory lying around I recommend giving this a shot. Now SSD's are fast, but memory is still much faster. This is done by moving Xcode's DerivedData folder as well as iOS Simulator Data to a RAM disk.Ī RAM disk is taking a chunk of memory and treating it as a if it were a drive. Its also fast, if not faster than the MBP for many things but disk operations are not.Ī few weeks ago on Dave Verwer's brilliant iOS Dev Weekly I found a blog post explaining how you could speed up Xcode (and AppCode) build times. Unfortunately the GPU died about a year ago so I've been using a 2011 iMac. My main development machine used to be a 2010 MacBook Pro with a 512 GB SSD.
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