cmake: Add target for obtaining local covarage reports

CMakeLists.txt

@@ -52,6 +52,7 @@ mark_as_advanced(
 
 option( BUILD_WITH_CCACHE             "Use ccache to speed up compilations"                   OFF )
 option( BUILD_WITH_COVERAGE           "Add compiler flags to generate coverage stats"         OFF )
+include(cmake/gcovr.cmake REQUIRED)
 
 set( PACKAGE_BUGREPORT                "http://github.com/exiv2/exiv2" )
 set( PACKAGE_URL                      "https://exiv2.org")

cmake/gcovr.cmake

@@ -0,0 +1,20 @@
+# Intentd usage
+#   cmake -DBUILD_WITH_COVERAGE=yes ../
+#   make -j
+#   make tests
+#   make coverage
+
+if(BUILD_WITH_COVERAGE)
+    find_program (GCOVR gcovr)
+
+    if(GCOVR)
+        file(MAKE_DIRECTORY ${CMAKE_BINARY_DIR}/coverage_output )
+        add_custom_command(OUTPUT _run_gcovr_parser
+            POST_BUILD
+            COMMAND ${GCOVR} --root ${CMAKE_SOURCE_DIR} --object-dir=${CMAKE_BINARY_DIR} --html --html-details -o coverage_output/coverage.html
+            WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
+        )
+        add_custom_target (coverage DEPENDS _run_gcovr_parser)
+    endif()
+
+endif(BUILD_WITH_COVERAGE)