Check Clang 15

Author: jwakely

.github/workflows/check-pr.yml

@@ -13,15 +13,15 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
 
     steps:
     - uses: actions/checkout@v4
       with:
         fetch-depth: 1
 
     - name: Compile binary programs
-      run: make CXX=g++-13 pgms
+      run: make CXX=clang++-16 pgms
 
     - name: Extract issue timestamps from published files
       run: |