Detailed guide on using gcov with CMake/CDash?

Question

I'm using CMake with my project and set up a cdash server for continuous/nightly building. Everything works well and by setting up a crontab, we have hourly/nightly build/test results uploaded to our cdash server automatically.

My next step is to add test coverage report to the build. I find the document here http://www.cmake.org/Wiki/CTest:Coverage but frankly it's a bit far from a practical guide.

Currently I've added the required flag (instead of -fprofile-arcs -ftest-coverage, I find --coverage better), the compilation process generates .gcno files. But then I'm stuck. The command

make NightlyCoverage

doesn't seem to do anything. Could anybody tell me what is the next to do? The result that I want, is by doing make NightlyCoverage, coverage reports are generated and uploaded to cdash server.

Answer 1

I've been using https://github.com/bilke/cmake-modules/blob/master/CodeCoverage.cmake successfully.

Just followed the guidelines: added the files to my CMAKE_MODULE_PATH directory, added

set(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/CMakeModules)
if(CMAKE_COMPILER_IS_GNUCXX)
    include(CodeCoverage)
    setup_target_for_coverage(${PROJECT_NAME}_coverage ${PROJECT_TEST_NAME} coverage)
endif()

in my CMakeLists.txt. I also added manually gcov as a dependency for my target:

if(CMAKE_COMPILER_IS_GNUCXX)
    target_link_libraries(${PROJECT_TEST_NAME} gcov)
endif()

With this, I just type

make my_project_coverage

and I get the html report in the coverage directory of my build tree.

Answer 2

I set up my project 'foo' in the following way. Copied the cmake file from the https://github.com/bilke/cmake-modules/blob/master/CodeCoverage.cmake to a subdirectory 'cmake_modules'. In the CMakeLists.txt file after the add_executable(foo ...) I added the following:

if(CMAKE_COMPILER_IS_GNUCXX)
LIST(APPEND CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake_modules")
include(CodeCoverage)
APPEND_COVERAGE_COMPILER_FLAGS()
set(COVERAGE_LCOV_EXCLUDES 'dir1/*' 'dir2/*') // this is optional if you want to exclude some directory from the report
SETUP_TARGET_FOR_COVERAGE_LCOV(NAME foo_coverage
                              EXECUTABLE foo
                              DEPENDENCIES foo)
endif()

After cmake, build the target make make foo_coverage And open the report with index.html file in the foo_coverage folder in the build folder

Answer 3

I have an ugly method to use gcovr to make a GCC Code Coverage Report without the CodeCoverage.cmake : move all *.gcno and *.gcda files to project root directory and then run gcovr

$ cd /path/to/your/project
$ mkdir build && cd build && cmake ..
$ make && make test
$ find . -type f \( -iname \*.gcno -or -iname \*.gcda \) -exec cp {} .. \;
$ cd .. 
$ gcovr -v -r .