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While I used to compile a single source file with Cmd+K in prior versions of Xcode, how does one do the same in Xcode 4? (Note that this is different than preprocessing or showing the disassembly of the file.) If compiling from a command line is proposed then it must be such that the project's settings, include paths, preprocessor definitions, etc., are all included.
An example use case is where I make a header file change but only want to test the change's effect with respect to a single source file, not all of the files that depend upon that header.
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Go to File->New->Target to create a new target. From the sounds of it, you are creating a command-line C program, so you will want to create a Command-Line Tool found under OS X-> Application . If that doesn't work, make sure the command line tools are installed.
Ctrl+F7 will compile only the active source file. Look for the Compile item at the bottom of the Build menu. Of course, you'll still have to do a build before you can test, but if you just want a quick sanity check after modifying a source file, this can be handy.
The command has been moved to the Perform Action submenu. Look under
Product > Perform Action > Compile filename.cpp To assign Cmd+K to it, go to
File > Preferences > Key Bindings > Product Menu group and you'll find Compile File where you can assign a key. Cmd+K is assigned to Clear Console now by default, so be sure to remove that binding to avoid conflicts.
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