Add code coverage report generation

.gitignore

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

Makefile

@@ -5,6 +5,8 @@ TARGET_FILE ?= ftdi_gpio
 CC = $(CROSS_COMPILE)gcc
 CPP = $(CROSS_COMPILE)cpp
 CHECK = cppcheck
+LCOV = lcov
+GENHTML = genhtml
 
 SRC_DIR = src
 OBJ_DIR = obj
@@ -15,16 +17,17 @@ 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 +45,14 @@ 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
+	$(GENHTML) -o coverage/html test.info
+
 .PHONY: unit_test
 build_unit_test: $(UNIT_TEST_TARGET)
 
@@ -51,7 +62,7 @@ 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)