Batch adding "-fno-objc-arc" flag to (multiple) source files

automatic-ref-counting, ios, iphone, objective-c, xcode4

Solution

Select the ones you want to add the flag to (using Shift and/or Command) and press Enter to display the flag editor. Press Done to apply the entered flag(s) to the selected file(s).

Tutorial

I have composed a blog post to serve as a tutorial for this process.

Problem

After converting an Xcode project to ARC (Automatic Reference Counting), I need to disable ARC for some of my source files (mainly third-party code). I know I need to set the "-fno-objc-arc" flag for each of these files, but Xcode doesn't give me a option for batch editing - I need to add this flag to each file manually, which may be tedious if you need to set it for multiple files. Does anyone have a smart approach to this?

Original source