Add C++ ctest coverage with gcovr in ctest ci job.

.gitlab-ci.yml

@@ -39,8 +39,11 @@ stages:
 
 ctest:
     variables: {SLOW_TESTS: "OFF", BUILD_MULTITHREAD: "ON"} # the CDashConfScript is able to retrieve OpenMP_gomp_LIBRARY and OpenMP_INC_DIR from environment (it's necessary on macOS, so the runner's env. must be configured)
+    coverage: '/Coverage: \d+\.\d+\%/'
     script:
         - ctest -O ctest.log -S ./CDashConfScript.cmake -j4 --output-junit junit_output.xml
+        - mkdir ctest_coverage && gcovr -r ./src/ ./build_* --html-details ctest_coverage/ctest_coverage.html
+        - 'echo Coverage: $(grep -A 3 Lines: ctest_coverage/index.html | tail -1 | sed -e "s/[^[:digit:]]\+//;s/[^%]\+$//")'
         - misc/continuous_integration/jobs/junit_html_report.sh cpp_test_report
         - if grep -B 1 'Outcome:.*Failed' $(ls build*/cpp_test_report.html | tail -1) | sed -ne 's%.*Test case:.*<b>\(.*\)</b>.*%\1%p'; then exit 1; else echo "all tests passed"; exit 0; fi
     except:

CMakeLists.txt

@@ -491,6 +491,12 @@ else()
 	message(STATUS "Failed to determine the compiler ${CMAKE_CXX_COMPILER} C++11 flag.")
 endif()
 
+if(BUILD_TESTING)
+	# coverage flags (for gcov and gcovr)
+	# we don't disable optimization because many tests would be too slow
+	# unfortunately the coverage measure should be less precise
+       set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fprofile-arcs -ftest-coverage" CACHE STRING "compile flags" FORCE)
+endif()
 
 
 if(BUILD_MULTITHREAD)

misc/test/src/C++/faust_circ.cpp.in

@@ -18,9 +18,6 @@ int main(int argc, char* argv[])
 
 
 
-	/* initilisation of the factors of the Faust */
-
-	// factor 1
 	MatDense<FPP,Cpu>* M;
 	MatDense<FPP,Cpu> M_copy;
 	M = MatDense<FPP,Cpu>::randMat(dim1,dim2);