Expand compiler flags for static code analysis

.vscode/tasks.json

@@ -8,9 +8,12 @@
             "type":"shell",
             "command": "make all -j4",
             "problemMatcher": {
-                "base": "gcc",
+                "base": "$gcc",
                 "owner": "gcc",
-                "fileLocation":"absolute"
+                "fileLocation": [
+                    "relative",
+                    "${workspaceFolder}"
+                ]
             },
             "group": {
                 "kind": "build",
@@ -22,9 +25,12 @@
             "type":"shell",
             "command": "make clean -j4",
             "problemMatcher": {
-                "base": "gcc",
+                "base": "$gcc",
                 "owner": "gcc",
-                "fileLocation":"absolute"
+                "fileLocation": [
+                    "relative",
+                    "${workspaceFolder}"
+                ]
             },
             "group": {
                 "kind": "build",

Makefile

@@ -20,7 +20,7 @@ LIBS := ftdi
 endif
 
 LD_FLAGS :=
-C_FLAGS := -O0 -g
+C_FLAGS := -O0 -g -Wall -Wextra -Werror
 CPP_FLAGS := $(addprefix -I, $(INCLUDES))
 
 C_SRCS = $(wildcard $(SRC_DIR)/*.c)

src/gpio.c

@@ -108,7 +108,7 @@ int gpio_read(const struct gpio *gpio, unsigned int *value)
 int gpio_write(const struct gpio *gpio, unsigned int value)
 {
     int res;
-    unsigned char mask;
+    unsigned char mask = gpio->ftdi_dev->status_mask;
 
     if(NULL == gpio) {
         return EXIT_FAILURE;

src/main.c

@@ -31,7 +31,7 @@ static const struct gpio gpio_2 = {
     .ftdi_dev = &ftdi_obj,
 };
 
-int main(int argc, char *argv[])
+int main(void)
 {
     int res, cnt;
     unsigned int value;