Code coverage not showing results using Xcode + gcov

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Thanks for all the info on stackoverfow and CubicleMuses

I have code coverage working for both simulator and device! Here are the steps and configuration that worked for me:

Configuration : Xcode 4 !

XCode project settings

Build Settings

  • Other Linker Flags: add “-lgcov”

  • GCC_GENERATE_TEST_COVERAGE_FILES: Set
    to YES

  • GCC_INSTRUMENT_PROGRAM_FLOW_ARCS: Set
    to YES

  • C/C++ Compiler Version: GCC
    4.2 (if you are on XCode 4) iOS deployment target: 4.2
  • Precompile prefix header: NO

Info.plist

  • Set UIApplicationExitsOnSuspend flag
    in your Info.plist to YES

Above steps are same for Simulator and Device however, we have some extra work to make it work on Device.

Main.m: Copy paste the below code to main.m

const char *prefix = "GCOV_PREFIX";
const char *prefixValue = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] cStringUsingEncoding:NSASCIIStringEncoding]; // This gets the filepath to the app's Documents directory
const char *prefixStrip = "GCOV_PREFIX_STRIP";
const char *prefixStripValue = "1";
setenv(prefix, prefixValue, 1); // This sets an environment variable which tells gcov where to put the .gcda files.
setenv(prefixStrip, prefixStripValue, 1); // This tells gcov to strip the default prefix, and use the filepath that we just declared.

Note: Make sure the above code is before:

NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
int retVal = UIApplicationMain(argc, argv, nil, nil);
[pool release];    
return retVal;

Why we set the above coverage variables?

http://gcc.gnu.org/onlinedocs/gcc/Cross_002dprofiling.html

How to get the .gcda files?

Use the Organizer in Xcode to download app’s package from the device to get the .gcda files out of the Documents directory.

Note: I could not get the code coverage using Xcode 3.2.5 with the same settings. But Xcode 4 was a cake-walk 🙂

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