Add code coverage report generation

.vscode/tasks.json

@@ -87,23 +87,6 @@
                 "kind": "build",
                 "isDefault": true
             }
-        },
-        {
-            "label": "coverage",
-            "type":"shell",
-            "command": "make coverage",
-            "problemMatcher": {
-                "base": "$gcc",
-                "owner": "gcc",
-                "fileLocation": [
-                    "relative",
-                    "${workspaceFolder}"
-                ]
-            },
-            "group": {
-                "kind": "build",
-                "isDefault": true
-            }
         }
     ],
     "presentation": {

Makefile

@@ -6,6 +6,7 @@ CC = $(CROSS_COMPILE)gcc
 CPP = $(CROSS_COMPILE)cpp
 CHECK = cppcheck
 LCOV = lcov
+GENHTML = genhtml
 
 SRC_DIR = src
 OBJ_DIR = obj
@@ -50,11 +51,7 @@ coverage: $(UNIT_TEST_TARGET)
 	@rm -f $(UNIT_TEST_OBJ_DIR)/*.gcda
 	@rm -f $(UNIT_TEST_OBJ_DIR)/*.gcno
 	$(LCOV) -c -d obj -d bin/test/unit/ -d src/ -d test/unit/ -o test.info --no-external
-	$(eval COVERAGE:=$(shell genhtml -o coverage/html test.info | grep 'lines' | egrep -o '[0-9]+.[0-9]+%'))
-	@echo
-	@echo Line coverage: $(COVERAGE)
-	@echo
-
+	$(GENHTML) -o coverage/html test.info
 
 .PHONY: unit_test
 build_unit_test: $(UNIT_TEST_TARGET)