Unrolling loops in one file

StackOverflow https://stackoverflow.com/questions/8002763

Question

I'm writing Objective-C code with LLVM. I have one file full of very performance-critical code. Is it possible to turn on compiler optimizations (specifically, loop unrolling) for just this one file, without setting a project-wide value?

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Solution

Yes, it's possible. Choose your project file from the project navigator. Then choose the target. Click the Build Phases tab. Open the Compile Sources section. Double-click the source file of interest and add the compiler flag. Here's a picture:

compiler flag for one source file

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