Why doesn't gcov report any lines being covered by my unit tests?

Question

I am using Xcode 3.2 on 10.6, with the shipped version of gcov and default GCC compiler (both version 4.2.1). I have created a dependent Cocoa unit test bundle which is injected

Answer 1

I have been trying to get the Code coverage working for iPhone simulator and always get a 0% coverage. Below are the configuration details and the steps that I have tried.

Configuration

Xcode 3.2.5/iOS 4.1 and iOS 4.2/Mac 10.6/GCC 4.2 Application UICatalog

References

http://www.cubiclemuses.com/cm/articles/2009/05/14/coverstory-on-the-iphone/

http://developer.apple.com/library/mac/#qa/qa2007/qa1514.html

Steps

• Enable “Generate Test Coverage Files”
• Enable “Instrument Program Flow”
• Add “-lgcov” to “Other Linker Flags”
• UIApplicationExitsOnSuspend flag in Info.plist is set to true

Result

I have the .gcda files generated but the coverage always show 0%.

Settings tried

1. Changing GCC to 4.0 and 4.2. When I try to change the GCC to 4.0 I get 26 build errors.

2. Set environment variables:

   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.)
   

3. GCC Optimization set to None (-O0) and unchecked the precompiled prefix header file flag.