CI: Enable GitHub Problem Matchers for compiler warnings.

.github/problemMatcher/gcc.json

@@ -0,0 +1,18 @@
+{
+    "__comment": "Taken from vscode-cpptools's Extension/package.json gcc rule",
+    "problemMatcher": [
+        {
+            "owner": "gcc-problem-matcher",
+            "pattern": [
+                {
+                    "regexp": "^(.*):(\\d+):(\\d+):\\s+(?:fatal\\s+)?(warning|error):\\s+(.*)$",
+                    "file": 1,
+                    "line": 2,
+                    "column": 3,
+                    "severity": 4,
+                    "message": 5
+                }
+            ]
+        }
+    ]
+}

.github/problemMatcher/msvc.json

@@ -0,0 +1,19 @@
+{
+    "__comment": "Taken from vscode's vs/workbench/contrib/tasks/common/problemMatcher.ts msCompile rule",
+    "problemMatcher": [
+        {
+            "owner": "msvc-problem-matcher",
+            "pattern": [
+                {
+                    "regexp": "^(?:\\s+\\d+\\>)?([^\\s].*)\\((\\d+),?(\\d+)?(?:,\\d+,\\d+)?\\)\\s*:\\s+(error|warning|info)\\s+(\\w{1,2}\\d+)\\s*:\\s*(.*)$",
+                    "file": 1,
+                    "line": 2,
+                    "column": 3,
+                    "severity": 4,
+                    "code": 5,
+                    "message": 6
+                }
+            ]
+        }
+    ]
+}

.github/workflows/sub_buildPixi.yml

@@ -83,6 +83,21 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v2
 
+    - name: Add GCC Problem Matcher
+      if: runner.os == 'Linux'
+      run: |
+        echo "::add-matcher::${{ runner.workspace }}/FreeCAD/.github/problemMatcher/gcc.json"
+
+    - name: Add Clang Problem Matcher
+      if: runner.os == 'macOS'
+      run: |
+        echo "::add-matcher::${{ runner.workspace }}/FreeCAD/.github/problemMatcher/clang.json"
+
+    - name: Add MSVC++ Problem Matcher
+      if: runner.os == 'Windows'
+      run: |
+        echo "::add-matcher::${{ runner.workspace }}/FreeCAD/.github/problemMatcher/msvc.json"
+
     - name: Make needed directories, files and initializations
       id: Init
       run: |