Add GCC compiler problem matcher to CI

.github/workflows/nestbuildmatrix.yml

@@ -570,12 +570,20 @@ jobs:
               -Dwith-libneurosim=${{ contains(matrix.use, 'libneurosim') && '$HOME/.cache/libneurosim.install' || 'OFF' }} \
               ..
 
+      - name: "Add GCC problem matcher"
+        run: |
+          echo "::add-matcher::gcc_problem_matcher.json"
+
       - name: "Build NEST"
         run: |
           cd "$NEST_VPATH"
           env
           make VERBOSE=1
 
+      - name: "Remove GCC problem matcher"
+        run: |
+          echo "::remove-matcher owner=gcc-problem-matcher::"
+
       - name: "Install NEST"
         run: |
           cd "$NEST_VPATH"
@@ -684,12 +692,20 @@ jobs:
               -Dwith-libneurosim=${{ contains(matrix.use, 'libneurosim') && '$HOME/.cache/libneurosim.install' || 'OFF' }} \
               ..
 
+      - name: "Add GCC problem matcher"
+        run: |
+          echo "::add-matcher::gcc_problem_matcher.json"
+
       - name: "Build NEST"
         run: |
           cd "$NEST_VPATH"
           env
           make VERBOSE=1
 
+      - name: "Remove GCC problem matcher"
+        run: |
+          echo "::remove-matcher owner=gcc-problem-matcher::"
+
       - name: "Install NEST"
         run: |
           cd "$NEST_VPATH"

gcc_problem_matcher.json

@@ -0,0 +1,17 @@
+{
+    "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
+                }
+            ]
+        }
+    ]
+}