Add GCC-based problem matcher to VS Code config

.vscode/tasks.json

@@ -1,24 +1,54 @@
 {
-    "version": "2.0.0",
+	"version": "2.0.0",
 
-    "tasks": [
-        {
-            "label": "Build",
-            "type": "shell",
-            "command": "zig build",
-            "group": {
-                "kind": "build",
-                "isDefault": true
-            }
-        },
-        {
-            "label": "Test",
-            "type": "shell",
-            "command": "zig build test",
-            "group": {
-                "kind": "test",
-                "isDefault": true
-            }
-        }
-    ]
+	"tasks": [
+		{
+			"label": "Build",
+			"type": "shell",
+			"command": "zig build",
+
+			"group": {
+				"kind": "build",
+				"isDefault": true
+			},
+
+			"presentation": {
+				"echo": true,
+				"reveal": "always",
+				"focus": true,
+				"panel": "shared",
+				"showReuseMessage": true,
+				"clear": true,
+				"revealProblems": "onProblem",
+			},
+
+			"problemMatcher": {
+				"source": "gcc",
+				"owner": "cpptools",
+
+				"fileLocation": [
+					"autoDetect",
+					"${cwd}",
+				],
+
+				"pattern": {
+					"regexp": "^(.*?):(\\d+):(\\d*):?\\s+(?:fatal\\s+)?(warning|error):\\s+(.*)$",
+					"file": 1,
+					"line": 2,
+					"column": 3,
+					"severity": 4,
+					"message": 5,
+				}
+			}
+		},
+		{
+			"label": "Test",
+			"type": "shell",
+			"command": "zig build test",
+			"group": {
+				"kind": "test",
+				"isDefault": true
+			},
+		},
+	],
 }