diff --git a/.github/workflows/cmake-single-platform.yml b/.github/workflows/cmake-single-platform.yml
index b29ca35..62fd92f 100644
--- a/.github/workflows/cmake-single-platform.yml
+++ b/.github/workflows/cmake-single-platform.yml
@@ -22,11 +22,13 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - uses: mpi4py/setup-mpi@v1
+      with:
+        mpi: mpich
 
     - name: Configure CMake
       # Configure CMake in a 'build' subdirectory. `CMAKE_BUILD_TYPE` is only required if you are using a single-configuration generator such as make.
       # See https://cmake.org/cmake/help/latest/variable/CMAKE_BUILD_TYPE.html?highlight=cmake_build_type
-      run: cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}}
+      run: cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -DCMAKE_CXX_FLAGS='-Wall -Wextra -pedantic' -DCMAKE_COMPILE_WARNING_AS_ERROR=ON
 
     - name: Build
       # Build your program with the given configuration
@@ -36,5 +38,5 @@ jobs:
       working-directory: ${{github.workspace}}/build
       # Execute tests defined by the CMake configuration.
       # See https://cmake.org/cmake/help/latest/manual/ctest.1.html for more detail
-      run: ctest -C ${{env.BUILD_TYPE}}
+      run: ctest -C ${{env.BUILD_TYPE}} --output-on-failure
 
diff --git a/gtest-mpi-listener.hpp b/gtest-mpi-listener.hpp
index 5cbce0c..a179173 100644
--- a/gtest-mpi-listener.hpp
+++ b/gtest-mpi-listener.hpp
@@ -99,7 +99,7 @@ class MPIEnvironment : public ::testing::Environment {
 
 private:
     // Disallow copying
-    MPIEnvironment(MPIEnvironment const& env) {}
+    MPIEnvironment(MPIEnvironment const&) {}
 
 }; // class MPIEnvironment
 
@@ -110,7 +110,8 @@ class MPIMinimalistPrinter : public ::testing::EmptyTestEventListener {
 public:
     MPIMinimalistPrinter() : ::testing::EmptyTestEventListener(), result_vector() {
         int is_mpi_initialized;
-        int return_code = MPI_Initialized(&is_mpi_initialized);
+        int return_code  = MPI_Initialized(&is_mpi_initialized);
+	static_cast<void>(return_code);
         assert(return_code == MPI_SUCCESS);
         if (!is_mpi_initialized) {
             printf("MPI must be initialized before RUN_ALL_TESTS!\n");
@@ -124,7 +125,8 @@ class MPIMinimalistPrinter : public ::testing::EmptyTestEventListener {
 
     MPIMinimalistPrinter(MPI_Comm comm_) : ::testing::EmptyTestEventListener(), result_vector() {
         int is_mpi_initialized;
-        int return_code = MPI_Initialized(&is_mpi_initialized);
+        int return_code  = MPI_Initialized(&is_mpi_initialized);
+	static_cast<void>(return_code);
         assert(return_code == MPI_SUCCESS);
         if (!is_mpi_initialized) {
             printf("MPI must be initialized before RUN_ALL_TESTS!\n");
@@ -140,6 +142,7 @@ class MPIMinimalistPrinter : public ::testing::EmptyTestEventListener {
     MPIMinimalistPrinter(MPIMinimalistPrinter const& printer) {
         int is_mpi_initialized;
         int return_code = MPI_Initialized(&is_mpi_initialized);
+	static_cast<void>(return_code);
         assert(return_code == MPI_SUCCESS);
         if (!is_mpi_initialized) {
             printf("MPI must be initialized before RUN_ALL_TESTS!\n");
@@ -157,6 +160,7 @@ class MPIMinimalistPrinter : public ::testing::EmptyTestEventListener {
     void OnEnvironmentTearDownStart() {
         int is_mpi_finalized;
         int return_code = MPI_Finalized(&is_mpi_finalized);
+	static_cast<void>(return_code);
         assert(return_code == MPI_SUCCESS);
         if (!is_mpi_finalized) {
             MPI_Comm_free(&comm);
@@ -279,7 +283,7 @@ class MPIWrapperPrinter : public ::testing::TestEventListener {
           listener(l),
           result_vector() {
         int is_mpi_initialized;
-        int return_code = MPI_Initialized(&is_mpi_initialized);
+        int return_code [[maybe_unused]] = MPI_Initialized(&is_mpi_initialized);
         assert(return_code == MPI_SUCCESS);
         if (!is_mpi_initialized) {
             printf("MPI must be initialized before RUN_ALL_TESTS!\n");
@@ -296,7 +300,7 @@ class MPIWrapperPrinter : public ::testing::TestEventListener {
         : listener(printer.listener),
           result_vector(printer.result_vector) {
         int is_mpi_initialized;
-        int return_code = MPI_Initialized(&is_mpi_initialized);
+        int return_code [[maybe_unused]] = MPI_Initialized(&is_mpi_initialized);
         assert(return_code == MPI_SUCCESS);
         if (!is_mpi_initialized) {
             printf("MPI must be initialized before RUN_ALL_TESTS!\n");
@@ -461,7 +465,7 @@ class MPIWrapperPrinter : public ::testing::TestEventListener {
     // Called before the Environment is torn down.
     virtual void OnEnvironmentsTearDownStart(::testing::UnitTest const& unit_test) {
         int is_mpi_finalized;
-        int return_code = MPI_Finalized(&is_mpi_finalized);
+        int return_code [[maybe_unused]] = MPI_Finalized(&is_mpi_finalized);
         assert(return_code == MPI_SUCCESS);
         if (!is_mpi_finalized) {
             MPI_Comm_free(&comm);