Question or issue on macOS:
I could successfully get code coverage information on our C++ code base on Linux using the GCC features of GCOV and the LCOV tool.
But I am having trouble in Mac OS X.
As Apple does not have the classic GCC compiler anymore, and we fear that the LLVM-GCC compiler would one day disappear too (LLVM-GCC is not even available as an option in Xcode 5.0) – we have decided to use Clang to compile our code.
While using the Clang compiler I am passing in these flags –>
-g -fprofile-arcs -ftest-coverage to generate the Code Coverage information.
I can see the .gcno files getting generated along with the object files.
When it comes to linking – “-lgcov” linker flag which works with GCC is not supported.
The code coverage on Clang / LLVM is now supported by the “profile_rt” library.
Unfortunately it’s a bit tricky to find this library because Apple for whatever reason decided not to include it in the default library path. Instead you’ll have to manually navigate to /usr/lib/ to link against it:
And as specified am linking against libprofile_rt.a library.
But i have linker issues.
But i keep getting these linker errors
Undefined symbols for architecture x86_64: "_llvm_gcov_init", referenced from: ___llvm_gcov_init in Iso9660Reader.o ___llvm_gcov_init in AutoExtractCreator.o ___llvm_gcov_init in TempFilePath.o ___llvm_gcov_init in TempPath.o ___llvm_gcov_init in ReadDirectory.o ___llvm_gcov_init in OpenDirectory.o ___llvm_gcov_init in SpltPath.o ... ld: symbol(s) not found for architecture x86_64
I also tried linking against the dynamic library – libprofile_rt.dylib found in
/usr/lib folder – But i still get the same issue.
This is Clang Version running on Mountain Lion.
clang --version Apple LLVM version 5.0 (clang-500.2.75) (based on LLVM 3.3svn) Target: x86_64-apple-darwin12.5.0 Thread model: posix
I also have Xcode 5.0 and Developer Tools installed.
How to solve this problem?
Solution no. 1:
I solved this.
I was missing the following Linker Flags
-Wall -fprofile-arcs -ftest-coverage
Solution no. 2:
Other Linker Flag
-fprofile-arcs fixes the issue for me.
Build Settings > Other Linker Flags > -fprofile-arcs
Solution no. 3:
The above answer did not work for me on OSX Yosemite (10.10.3) with Xcode 6.3.1. It seems that Apple moved these libraries around. I was able to get it to work with the following compile options: