Add code coverage target to CMake

cmake/CMakeLists.txt

@@ -49,6 +49,11 @@ if (${CMAKE_CXX_COMPILER_ID} STREQUAL "Intel")
   set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -restrict")
 endif()
 
+option(ENABLE_COVERAGE "Enable code coverage" OFF)
+if(ENABLE_COVERAGE)
+  set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --coverage")
+endif()
+
 ########################################################################
 # User input options                                                   #
 ########################################################################
@@ -822,9 +827,37 @@ if(ENABLE_TESTING)
   add_test(ShowHelp lmp${LAMMPS_MACHINE} -help)
 endif()
 
-##################################
+###############################################################################
+# Testing
+#
+# Requires latest gcovr (for GCC 8.1 support):#
+# pip install git+https://github.com/gcovr/gcovr.git
+###############################################################################
+if(ENABLE_COVERAGE)
+    find_package(GCOVR)
+
+    if(GCOVR_FOUND)
+        get_filename_component(ABSOLUTE_LAMMPS_SOURCE_DIR ${LAMMPS_SOURCE_DIR} ABSOLUTE)
+
+        add_custom_target(
+            gen_coverage_xml
+            COMMAND ${GCOVR_BINARY} -s -x -r ${ABSOLUTE_LAMMPS_SOURCE_DIR} --object-directory=${CMAKE_BINARY_DIR} -o coverage.xml
+            WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
+            COMMENT "Generating XML Coverage Report..."
+        )
+
+        add_custom_target(
+            gen_coverage_html
+            COMMAND ${GCOVR_BINARY} -s  --html --html-details -r ${ABSOLUTE_LAMMPS_SOURCE_DIR} --object-directory=${CMAKE_BINARY_DIR} -o coverage.html
+            WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
+            COMMENT "Generating HTML Coverage Report..."
+        )
+    endif()
+endif()
+
+###############################################################################
 # Print package summary
-##################################
+###############################################################################
 foreach(PKG ${DEFAULT_PACKAGES} ${OTHER_PACKAGES} ${ACCEL_PACKAGES})
   if(PKG_${PKG})
     message(STATUS "Building package: ${PKG}")

cmake/Modules/FindGCOVR.cmake

@@ -0,0 +1,13 @@
+# - Find gcovr
+# Find the gcovr utility
+#
+#  GCOVR_BINARY       - path to gcovr executable
+#  GCOVR_FOUND        - True if gcovr found.
+#
+find_program(GCOVR_BINARY gcovr)
+
+include(FindPackageHandleStandardArgs)
+# handle the QUIETLY and REQUIRED arguments and set GCOVR_FOUND to TRUE
+# if all listed variables are TRUE
+
+find_package_handle_standard_args(GCOVR DEFAULT_MSG GCOVR_BINARY)