Tag Archives: xcode

OpenMP Clang in Xcode

I’ve been playing around with prime numbers recently, which (naturally?) extended into an investigation into parallel programming. I installed the latest version of GCC 5 (v5.3.0 at the time of writing) using these instructions and got OpenMP running (support is built-in). I’m fine with using Terminal but I thought it would be interesting to try this in Xcode.

I installed the OpenMP C/C++ language extensions for Clang using homebrew with instructions from here. Unfortunately, I received the following error:

can't exec '/usr/local/bin/clang++-omp' (No such file or directory)

It turns out those instructions were missing a symlink that needs to be created. It’s as follows:

sudo ln -s /usr/local/bin/clang-omp++ /usr/local/bin/clang++-omp

Thanks to Stack Overflow for the “full” instructions. I can now build and run C++ parallelized code directly inside Xcode. I am finding a performance difference running the same code via the Terminal vs inside Xcode (which is slower). Hmm…

Ctrl-drag to Create Outlets in Custom Views

If anyone can tell me why Xcode (I’m using Xcode 7 beta 5) works this way, I’d greatly appreciate. I have created custom table view cells in the past and I’ve always control-dragged from my storyboard into the custom class to create the outlets. So, when I went to create outlets for a custom (ui)view I’m working on, I was stumped when I couldn’t ctrl-drag into the .h or .m file to create them (outlets or actions).

[Yes, I have all the relevant custom classes specified in the Identity inspector.]

The workaround is to type in the outlet/action code by hand. Once you have entered in your custom class file, you can connect the outlets/actions by dragging from the little dot (do these things have a special name?) Xcode puts in the line number gutter to the relevant UI element. What a pain in the ass.