Getting 0 gcov coverage for a mac app

问题:

I have done the following but I am still getting 0% gcov coverage for my .app. Here is what I am doing:

1. I am using Xcode 3.2.6, GCC 4.2 and am on Mac OSX 10.6.
2. I duplicated the Debug config and call it Gcov. In the Gcov config and the app target I set the following build configuration:
   • Check "Generate Test Coverage Files"
   • Check "Instrument Program Flow"
   • Add "-lgcov" to "Other Linker Flags"
3. I did a 'Clean All' then I did a 'Build and Run'.
4. Once the build successfully built it launched the app. I did some quick things in the app and exited.
5. When I go view the .gcda/.gcno I see that they have been generated and in fact every time I launch the app and do additional things in the app I see the .gcda/.gcno files are indeed updating. However, using gcov/gcovr to view the .gcda/.gcno I keep getting 0 coverage.

Any ideas as to what I am doing wrong? Thanks for any help.

回答1:

Check to see if your gcc is really gcc with gcc --version. On newer Macs, gcc is now linked to llvm-gcc, which evidently doesn't support gcov. If you find that this is the case, use clang/clang++ in lieu of gcc/g++.