Warning: The following is mostly unnecessary tinkering
To get a handle on Objective C using Mac OS, I wanted a simple way to compile from the terminal. A quick search made me realize that the LLVM compiler is not accessible via the terminal. You can download it via XCode -> Preferences -> Downloads. But when you go there you will see the following note:
“Before installing, note that from within Terminal you can use the XCRUN tool to launch compilers and other tools embedded within the Xcode application.”
So to compile via XCRUN I found you have to run this command:
$ xcrun -sdk /Applications/Xcode.app/Contents/Developer//Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk gcc hello.c
To shorten that you can setup an alias in your .bash_profile.
Open the terminal by pressing Command + Space and type Terminal in Spotlight then press enter once it appears.
Create or edit your profile by typing the following:
Once vim is open press ‘i’ for insert mode and add the following line:
alias c='xcrun clang --sysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk/'
Change to vim command mode by pressing ESC. Save and exit by typing ‘:wq’
To test the alias, using Xcode make a new Objective-C class.
Delete all the code Xcode gives you by default and stick the following C code to keep it simple.
In Terminal and change to the location where your file is then type this command:
c program1.m -o program1
Your program should compile with no errors. To run it, simply type:
Then hit return.