Improved CI problem matching by always doing out-of-source build (Ninja issue)

.github/workflows/build.yml

@@ -97,6 +97,8 @@ jobs:
     steps:
     - name: "Checkout"
       uses: actions/checkout@v2
+      with:
+        path: "source"
 
     - name: "Python"
       uses: actions/setup-python@v2
@@ -104,14 +106,14 @@ jobs:
         python-version: "3.x"
 
     - name: "Prepare"
-      run: python -B .github/workflows/run-step.py
+      run: python -B source/.github/workflows/run-step.py
                      --step=prepare
                      --compiler=${{matrix.cxx}}
                      --architecture=${{matrix.architecture}}
                      --diagnose=${{matrix.diagnose}}
 
     - name: "Configure"
-      run: python -B .github/workflows/run-step.py
+      run: python -B source/.github/workflows/run-step.py
                      --step=configure
                      --compiler=${{matrix.cxx}}
                      --architecture=${{matrix.architecture}}
@@ -121,7 +123,7 @@ jobs:
                      --problem-matcher=${{matrix.problem_matcher}}
 
     - name: "Build"
-      run: python -B .github/workflows/run-step.py
+      run: python -B source/.github/workflows/run-step.py
                      --step=build
                      --compiler=${{matrix.cxx}}
                      --architecture=${{matrix.architecture}}
@@ -129,7 +131,7 @@ jobs:
                      --diagnose=${{matrix.diagnose}}
 
     - name: "Test"
-      run: python -B .github/workflows/run-step.py
+      run: python -B source/.github/workflows/run-step.py
                      --step=test
                      --build-type=${{matrix.build_type}}
                      --diagnose=${{matrix.diagnose}}

.github/workflows/run-step.py

@@ -76,8 +76,10 @@ def main():
       generator = "Visual Studio 15 2017"
     elif compiler == "vs2019":
       generator = "Visual Studio 16 2019"
-    else:
+    elif platform_name == "Darwin":
       generator = "Unix Makefiles"
+    else:
+      generator = "Ninja"
 
 
   # ---------------------------------------------------------------------------
@@ -126,7 +128,7 @@ def main():
   # ---------------------------------------------------------------------------
   if step == "configure":
     if args.problem_matcher:
-      log("::add-matcher::.github/problem-matcher.json")
+      log("::add-matcher::" + os.path.join(source_root, ".github", "problem-matcher.json"))
 
     os.makedirs(args.build_dir, exist_ok=True)