diff --git a/.github/workflows/Pipeline.yml b/.github/workflows/Pipeline.yml
index 00e22a1..93fa803 100644
--- a/.github/workflows/Pipeline.yml
+++ b/.github/workflows/Pipeline.yml
@@ -12,12 +12,16 @@ jobs:
       fail-fast: false
       matrix:
         os:
-          - {'icon': '🐧', 'name': 'Ubuntu',  'image': 'ubuntu-24.04', 'backend': 'mcode'}
-          - {'icon': '🍏', 'name': 'macOS',   'image': 'macos-14',     'backend': 'mcode'}
-          - {'icon': '🪟', 'name': 'Windows', 'image': 'windows-2022', 'backend': 'mcode'}
+          - {'icon': '🐧', 'name': 'Ubuntu',  'image': 'ubuntu-24.04', 'shell': 'bash', 'backend': 'mcode'}
+          - {'icon': '🐧', 'name': 'Ubuntu',  'image': 'ubuntu-24.04', 'shell': 'bash', 'backend': 'llvm'}
+          - {'icon': '🐧', 'name': 'Ubuntu',  'image': 'ubuntu-24.04', 'shell': 'bash', 'backend': 'llvm-jit'}
+          - {'icon': '🐧', 'name': 'Ubuntu',  'image': 'ubuntu-24.04', 'shell': 'bash', 'backend': 'gcc'}
+          - {'icon': '🍎', 'name': 'macOS',   'image': 'macos-13',     'shell': 'bash', 'backend': 'mcode'}
+          - {'icon': '🍏', 'name': 'macOS',   'image': 'macos-14',     'shell': 'bash', 'backend': 'llvm'}
+          - {'icon': '🪟', 'name': 'Windows', 'image': 'windows-2022', 'shell': 'bash', 'backend': 'mcode'}
     defaults:
       run:
-        shell: bash
+        shell: ${{ matrix.os.shell }}
 
     steps:
       - name: Setup GHDL
@@ -25,3 +29,8 @@ jobs:
         with:
           version: nightly
           backend: ${{ matrix.os.backend }}
+          investigate: true
+
+      - name: Verify
+        run: |
+          ghdl --version
diff --git a/action.yml b/action.yml
index 65bae0c..479a738 100644
--- a/action.yml
+++ b/action.yml
@@ -46,6 +46,9 @@ runs:
       if: runner.os == 'Linux' && runner.arch == 'X64'
       shell: bash
       run: |
+        ANSI_LIGHT_BLUE="\e[94m"
+        ANSI_NOCOLOR=$'\x1b[0m'
+
         source /etc/lsb-release
 
         if [[ "${DISTRIB_RELEASE}" != "24.04" ]]; then
@@ -82,16 +85,20 @@ runs:
           mkdir -p "${{ inputs.install-directory }}"
           cd "${{ inputs.install-directory }}"
 
-          printf "Downloading asset and extracting tar.gz file ...\n"
-          curl -L "https://github.com/ghdl/ghdl/releases/download/${VERSION_IN_URL}/ghdl-${{ inputs.backend }}-${VERSION_IN_FILE}-ubuntu${DISTRIB_RELEASE}-x86_64.tar.gz" | tar -xz --strip-components 1
-          (
-            cd bin
-            pwd
-            ls -lAh .
-          )
-          # tree .
-          printf "Installing dependencies from './ubuntu.requirements' using 'apt-get' ...\n"
+          DOWNLOAD_URL="https://github.com/ghdl/ghdl/releases/download/${VERSION_IN_URL}/ghdl-${{ inputs.backend }}-${VERSION_IN_FILE}-ubuntu${DISTRIB_RELEASE}-x86_64.tar.gz"
+          printf "::group::${ANSI_LIGHT_BLUE}%s${ANSI_NOCOLOR}\n" "Downloading asset and extracting '${DOWNLOAD_URL}' file ..."
+          curl -L "${DOWNLOAD_URL}z" | tar -xz --strip-components 1
+          printf "::endgroup::\n"
+
+          if [[ "${{ inputs.investigate }}" == "true" ]]; then
+            printf "::group::${ANSI_LIGHT_BLUE}%s.${ANSI_NOCOLOR}\n" "Content of '$(pwd)'"
+            tree -pash .
+            printf "::endgroup::\n"
+          fi
+
+          printf "::group::${ANSI_LIGHT_BLUE}%s.${ANSI_NOCOLOR}\n" Installing dependencies from './ubuntu.requirements' using 'apt-get' ..."
           sudo xargs --no-run-if-empty -a ./ubuntu.requirements -- apt-get install -y --no-install-recommends
+          printf "::endgroup::\n"
         )
 
         printf "Setting environment variable 'GHDL_PREFIX' ...\n"
@@ -187,7 +194,7 @@ runs:
           exit 1
         fi
 
-        if [[ "${{ inputs.backend }}" != "mcode" ]]; then
+        if [[ "${{ inputs.backend }}" != "llvm" ]]; then
           printf "::error title=%s::%s\n" "setup-ghdl" "Unsupported GHDL backend '${{ inputs.backend }}'."
           exit 1
         else