Run test-gibbon-examples workflow once for each compiler

Author: Noir01

.github/workflows/test-gibbon-examples.yml

@@ -2,8 +2,11 @@ name: Test Gibbon examples
 on: [ push, pull_request ]
 jobs:
   linux:
-    name: test-gibbon
+    name: test-gibbon (${{ matrix.cc }})
     runs-on: ubuntu-22.04
+    strategy:
+      matrix:
+        cc: [gcc, clang]
     steps:
       - name: dependencies
         run: |
@@ -12,7 +15,7 @@ jobs:
           sudo apt-get update
           sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
           sudo apt update
-          sudo apt-get install -y libgc-dev libgmp-dev uthash-dev gcc-11 racket
+          sudo apt-get install -y libgc-dev libgmp-dev uthash-dev gcc-11 clang racket
           sudo unlink /usr/bin/gcc && sudo ln -s /usr/bin/gcc-11 /usr/bin/gcc
       - name: ghc and cabal
         env:
@@ -70,4 +73,4 @@ jobs:
         run: |
           export GIBBONDIR=`pwd`
           cd gibbon-compiler/
-          cabal v2-exec -w $HC test-gibbon-examples -- -v2
+          cabal v2-exec -w $HC test-gibbon-examples -- -v2 --cc=${{ matrix.cc }}