diff --git a/.github/actions/build-tntcxx/action.yml b/.github/actions/build-tntcxx/action.yml
index 9a715f7f4..c7fef8e20 100644
--- a/.github/actions/build-tntcxx/action.yml
+++ b/.github/actions/build-tntcxx/action.yml
@@ -9,6 +9,16 @@ inputs:
     default: 'false'
   cxx-standard:
     desciption: 'Corresponds to CMAKE_CXX_STANDARD option of CMake'
+  cxx-flags:
+    desciption: 'Corresponds to CMAKE_CXX_FLAGS option of CMake'
+  cxx-compiler:
+    description: 'a'
+  c-compiler:
+    description: 'a'
+  cxx-compiler-flags:
+    description: 'a'
+  exe-linker-flags:
+    description: 'b'
 
 runs:
   using: "composite"
@@ -23,6 +33,10 @@ runs:
         -DTNTCXX_ENABLE_SSL=ON \
         -DCMAKE_BUILD_TYPE=${{ inputs.build-type }} \
         -DTNTCXX_ENABLE_SANITIZERS=${{ inputs.enable-sanitizers }} \
-        -DCMAKE_CXX_STANDARD=${{ inputs.cxx-standard }}
+        -DCMAKE_CXX_STANDARD=${{ inputs.cxx-standard }} \
+        -DCMAKE_C_COMPILER=${{ inputs.c-compiler }} \
+        -DCMAKE_CXX_COMPILER=${{ inputs.cxx-compiler }} \
+        -DCMAKE_CXX_FLAGS=${{ inputs.cxx-compiler-flags }} \
+        -DCMAKE_EXE_LINKER_FLAGS=${{ inputs.exe-linker-flags }}
         make -j
       shell: bash
diff --git a/.github/workflows/reusable-testing.yml b/.github/workflows/reusable-testing.yml
index 0937525fc..00551fff7 100644
--- a/.github/workflows/reusable-testing.yml
+++ b/.github/workflows/reusable-testing.yml
@@ -12,6 +12,12 @@ on:
       cxx-standard:
         required: false
         type: number
+      c-compiler:
+        default: gcc
+        type: string
+      cxx-compiler:
+        default: g++
+        type: string
       use-valgrind:
         default: false
         type: boolean
@@ -35,12 +41,21 @@ jobs:
         if: inputs.use-valgrind
         run: sudo apt update && sudo apt install -y valgrind
 
+      - name: Remove gcc-13
+        if: ${{ inputs.runs-on == ubuntu-22.04 && inputs.cxx-compiler == clang++ }}
+        run: |
+          sudo apt remove gcc-13 g++-13 libstdc++-13-dev gcc g++ libstdc++-dev
+          sudo apt autoremove
+          sudo apt install g++-12
+
       - name: Build tntcxx
         uses: ./.github/actions/build-tntcxx
         with:
           build-type: ${{ inputs.build-type }}
           enable-sanitizers: ${{ inputs.enable-sanitizers }}
           cxx-standard: ${{ inputs.cxx-standard }}
+          c-compiler: ${{ inputs.c-compiler }}
+          cxx-compiler: ${{ inputs.cxx-compiler }}
 
       - name: Test tntcxx
         uses: ./.github/actions/test-tntcxx
diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index 313e3f9a9..fe2a04f34 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -18,16 +18,27 @@ jobs:
           - ubuntu-22.04
           - macos-11
           - macos-12
+        compiler:
+          - {c: gcc, cxx: g++}
+          - {c: clang, cxx: clang++}
         build-type:
           - Debug
           - RelWithDebInfo
         cxx-standard:
           - 17
           - 20
+        exclude:
+          - runs-on: macos-11
+            compiler: {c: gcc, cxx: g++}
+          - runs-on: macos-12
+            compiler: {c: gcc, cxx: g++}
+
     with:
       runs-on: ${{ matrix.runs-on }}
       build-type: ${{ matrix.build-type }}
       cxx-standard: ${{ matrix.cxx-standard }}
+      c-compiler: ${{ matrix.compiler.c }}
+      cxx-compiler: ${{ matrix.compiler.cxx }}
 
   valgrind:
     uses: ./.github/workflows/reusable-testing.yml