Introduce a GCC Warning

.github/workflows/gcc-problems.yml

@@ -12,24 +12,27 @@ jobs:
     steps:
       - 
         name: Check Out Repo 
-        uses: actions/checkout@v
-      -
-        name: Install GCC
-        run : |
-          sudo apt-get install gcc
+        uses: actions/checkout@v2
       -
         # For more complex builds, e.g. monorepos, build warnings may not contain the path from root.
         # This can interfere with annotation application.
         #
         # See the following resources for possible future fixes or alternatives.
-        # - https://github.com/microsoft/vscode-cpptools/issues/2266 for path fixups
+        # - https://github.com/actions/toolkit/issues/480 <- excellent post by xt0rted
+        # - https://github.com/microsoft/vscode-cpptools/issues/2266
+        # - https://github.com/actions/toolkit/issues/480
         # - https://github.com/actions/runner/issues/659
         # - https://github.com/actions/runner/issues/765
         name: Load gcc-problem-matcher
-        uses: ammaraskar/gcc-problem-matcher@master
+        uses: electronjoe/gcc-problem-matcher-ts@v1
+      -
+        name: Problem Match Aware Change root
+        run: |
+          echo "main.cpp:44:9: warning: unused variable ‘unused_variable’ [-Wunused-variable]"
       -
         name: build
         run: |
+          echo "SHM:src/-"
           cd src
           g++ -Wall -Wextra main.cpp
           ./a.out

src/main.cpp

@@ -1,5 +1,7 @@
 #include <iostream>
 
 int main() {
+    int unused_variable = 1;
+
     std::cout << "Hello World" << std::endl;
 }