Add code coverage report generation

.gitignore

@@ -1,2 +1,4 @@
 bin/
 obj/
+coverage/
+test.info

.vscode/tasks.json

@@ -87,6 +87,23 @@
                 "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

@@ -5,6 +5,7 @@ TARGET_FILE ?= ftdi_gpio
 CC = $(CROSS_COMPILE)gcc
 CPP = $(CROSS_COMPILE)cpp
 CHECK = cppcheck
+LCOV = lcov
 
 SRC_DIR = src
 OBJ_DIR = obj
@@ -15,16 +16,17 @@ UNIT_TEST_OBJ_DIR = $(OBJ_DIR)/$(UNIT_TEST_SRC_DIR)
 INCLUDES := inc
 INCLUDES += /usr/include/libftdi1
 
-ifneq "$(findstring $(MAKECMDGOALS), build_unit_test exec_unit_test)" ""
+ifneq "$(findstring $(MAKECMDGOALS), build_unit_test exec_unit_test coverage)" ""
 INCLUDES += test/inc
+C_FLAGS += -fprofile-arcs -ftest-coverage
+L_FLAGS += -fprofile-arcs -ftest-coverage
 else
 LIBS := ftdi1
 endif
 
-LD_FLAGS :=
-C_FLAGS := -O0 -g -Wall -Wextra -Werror
-CPP_FLAGS := $(addprefix -I, $(INCLUDES))
-CHECK_CLAGS := --enable=all --template=gcc --error-exitcode=1 --suppress=missingIncludeSystem
+C_FLAGS += -O0 -g -Wall -Wextra -Werror
+CPP_FLAGS += $(addprefix -I, $(INCLUDES))
+CHECK_FLAGS = --enable=all --template=gcc --error-exitcode=1 --suppress=missingIncludeSystem
 
 C_SRCS = $(wildcard $(SRC_DIR)/*.c)
 C_OBJS = $(patsubst $(SRC_DIR)%,$(OBJ_DIR)%,$(patsubst %.c,%.o,$(C_SRCS)))
@@ -42,6 +44,18 @@ THIS_MAKEFILE := $(lastword $(MAKEFILE_LIST))
 .PHONY: all
 all: $(TARGET)
 
+.PHONY: coverage
+coverage: $(UNIT_TEST_TARGET)
+	$(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
+
+
 .PHONY: unit_test
 build_unit_test: $(UNIT_TEST_TARGET)
 
@@ -51,7 +65,7 @@ exec_unit_test: $(UNIT_TEST_TARGET)
 
 .PHONY: check
 check: $(C_SRCS)
-	$(CHECK) $(CPP_FLAGS) $(CHECK_CLAGS) $(C_SRCS)
+	$(CHECK) $(CPP_FLAGS) $(CHECK_FLAGS) $(C_SRCS)
 
 $(UNIT_TEST_TARGET): $(UNIT_TEST_OBJS) $(THIS_MAKEFILE)
 	@mkdir -p $(BIN_DIR)/$(UNIT_TEST_SRC_DIR)