fix: fix MacOS test launching

* Update makefile to use appropriate arguments to find executables on
  macos systems.
* Add `set -e` to make sure that the tests crash if something goes wrong
  in the build or test of the macos job of the CI.

closes #783

.github/workflows/continuous-integration.yml

@@ -256,6 +256,7 @@ jobs:
       # and will at least give minimum confidence that the compiler works in PRs
       - name: Build
         run: |
+          set -e
           cd compiler
           echo "Debug: ccache statistics (prior to the build):"
           ccache -s
@@ -273,6 +274,7 @@ jobs:
       - name: Test
         if: github.event_name == 'push'
         run: |
+          set -e
           cd compiler
           echo "Debug: ccache statistics (prior to the tests):"
           ccache -s