Using Xcode

Overview

Notes on using the Xcode IDE.

Slow builds

• Use plain “DWARF” instead of “DWARF with dSYM File” as your “Debug Information Format”.
  Project Navigator pane > left click on project > Editor Area > Build Settings tab > All filter under what settings to display > Build Options group > Debug Information Format: DWARF
• Don’t compile your project code or use static libraries compiled with -O4 since it tells Clang to enable Link Time Optimizations (LTO) making the linking stage much slower. Use -O3 at most.'
  Project Navigator pane > left click on project > Editor Area > Build Settings tab > All filter under what settings to display > Apple LLVM 6.0 - Code Generation group > Optimization Level > Debug: Fastest [-O3]

From Shaving off 50% waiting time from the iOS Edit-Build-Test cycle | Spotify Labs, Nov 4, 2013