Limit gcov flags to ctest ci job (C++ tests).

.gitlab-ci.yml

@@ -38,7 +38,7 @@ stages:
     - conda_pkgs
 
 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)
+    variables: {SLOW_TESTS: "OFF", BUILD_MULTITHREAD: "ON", GCOV_FLAGS: "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

CMakeLists.txt

@@ -491,11 +491,13 @@ 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 "${CMAKE_CXX_FLAGS} -fprofile-arcs -ftest-coverage" CACHE STRING "compile flags" FORCE)
+if(BUILD_TESTING AND DEFINED ENV{GCOV_FLAGS})
+	if($ENV{GCOV_FLAGS} MATCHES "ON")
+		# 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()
 endif()