We are using gcov and lcov for code coverage. After installing a instrumented build we see 5060 gcno files. when we run a test we see around 4687 gcda files. Each test run shows different number of gcda files. Though our build has 5060 files why each test run shows different number of total files as shown below?:
Test1% = 2808(covered files)/4883(total files)
Test2% = 2501(covered files)/4811(total files)
Why my code coverage output varying total files for each test run? Can we make it constant so our coverage calculations are meaningful/proper.
Related
The problem I'm running into is that my bazel coverage output coverage data feels incomplete.
For example, I have a project with 10 source files, and 1 test file (which tests only 1 source file).
Run bazel clean && bazel coverage --combined_report=lcov -- //src/...:all
Verify coverage data generated with find -L -type f -name 'coverage.dat'
Notice that:
There exists 1 coverage file for each test run
(Problem!) There is no coverage data for the untested source files
Does anyone know how to configure bazel to generate a complete coverage report, which includes the untested source files as well?
Using gcc 8.2.0, and given a coverage run, with files called myfile.cov.gcda and myfile.cov.gcno, how do I extract line coverage data for myfile.cc on the command line?
I am using gcov to find code coverage of my application while running functional test cases.
Issue: .gcda files are not getting created for few classes though those classes are being executed
Steps:
Compile Application code with gcov and verify .gcno files are generated for all classes
Create binary image of compiled code and deploy server using that binary
Use cross profiling while deploying server. Home directory structure for my source code was "/proj/QQ/scm/tools/jenkins/db_ws/FunctionTestCoverage/ccode/" and I used below mentioned gcov parameters for cross profiling
GCOV_PREFIX=/automation/testCoverage
GCOV_PREFIX_STRIP=7
Run Functional Test Cases to hit application code
.gcda files gets created for few classes only. It is not getting created for all classes which are being executed.
.gcda files are generating under directory structure "/automation/testCoverage/ccode"
I believe this should not be issue with cross profiling. suppose I have 5 directories in parallel then .gcda files are generating for 2 directories only.
What can be root cause for my issue where .gcda are generating for only few files and how to resolve this?
I have written a sample program using C++. I have written corresponding unit tests using GUNIT framework. I was successfully able to generate.gcda and .gcno files for every source file. I used (gcov -b -l -p -c *.gcno) command in the folder where the .gcno files were generated. I am using gcov 7.5.0 . When i ran this command i saw that it gave me a)Lines covergae in percentage b)Branches covered in percentage c)Taken atleast once . Next i ran (gcovr --html -o Filename.html -r /path_to_C_sourceFiles/ .) command to generate the html output for this data. In the html file i see that the branch covergae data is extracted from the taken atleast once data which was generated by the gcov. Why is the html not taking the branches covered percentage from the gcov data and displaying it as branch covergae. Taken atleast data given by the gcov tool is a reduced number when compared to branches percentage. What is this taken atleast once?
A branch is covered if it was taken at least once. If a branch is executed multiple times, it is not more covered. So gcovr primarily considers covered/uncovered status for lines and branches, whereas GCC's gcov tool shows execution counts and branch probabilities.
Having access to the branch probabilities can be useful. Not in the context of testing, but perhaps for low-level code optimization. If you need that data, you will likely want to look at the gcov files yourself.
However, the next version of gcovr (expected to be gcovr 4.3) will show branch counts (not percentages) in the HTML report:
For each line with branch coverage data, there will be a popup that shows full branch counts.
You can use this functionality right now if you install gcovr's development version:
pip install git+https://github.com/gcovr/gcovr.git
Good morning,
I've got a problem when using GCOV within my working environment.
Gcov is working very well when I run some tests cases (up to 1000) but no gcda are generated when running more tests.
This is how I use it.
I compile my code with gcov flags correctly set
I boot a test server containing the gcov libs, and the variables GCOV_PREFIX and GCOV__PREFIX_STRIP
I launch my regression on this server
Once finished I stop the server and now all the gcda files are generated
use lcov and genhtml to generate the test coverage and the report.
This works very well when I've got few tests to lauch (up to 1000 cases I guess), but if I run more tests, I don't get any gcda files anymore...
I could not find any documentation on this part, is there a buffer somewhere, where all the gcdas files are stored waiting for the server to be released?
Is it possible to parameter this setting?
Is there any documentation on this subject somewhere?
Thanks a lot for your help.
Regards,
Thomas