iOS 7.1 fixes an important cause of random crashes in all 64-bit apps. If you have an iPhone 5s or retina iPad then you really want this.
On a 64-bit device, being the only 32-bit app incurs a significant memory size cost. Don't be that app.
Run `env OBJC_HELP=YES true` to see libobjc's recognized environment variables. Most are to help me debug, but some might help you debug.
Read Bill Atkinson's Quickdraw implementation. This code is amazing. computerhistory.org/atchm/macpaint…
An AddressSanitizer run of clang building itself catches a use-after-free error while compiling AddressSanitizer's implementation.