diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 52e3b9b9dd3b1aa2c238bf8566aa7634bbf94a4d..b3c065c4c44e67d6f7d52100a772b906010b9b77 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -34,27 +34,26 @@ stages:
     paths:
       - $BUILD_FOLDER
 
-  before_script:
-    - export CC=gcc
-    - export CXX=g++
+  script:
     - export CCACHE_BASEDIR=$CI_PROJECT_DIR
     - export CCACHE_DIR=$CI_PROJECT_DIR/cache
-    - ccache -s
-
-
-  script:
+    - export CCACHE_COMPILERCHECK=content
+    - ccache --zero-stats
+    - ccache --show-stats
     - $CXX --version
     - $CC --version
     - cmake --version
     - mpirun --version
     - mkdir -p $CI_PROJECT_DIR/$BUILD_FOLDER
     - cd $CI_PROJECT_DIR/$BUILD_FOLDER
+    - rm -r -f ./*
     - cmake ..
       --preset=all_make_ccache
       -DBUILD_WARNINGS_AS_ERRORS=ON
       -DCMAKE_CUDA_ARCHITECTURES=60
     - cmake . -LAH
     - make -j4
+    - ccache --show-stats
 
   variables:
     BUILD_FOLDER: "build"
@@ -63,8 +62,11 @@ stages:
 gcc_9:
   extends: .gnu_build_template
 
-###############################################################################
+  before_script:
+    - export CC=gcc
+    - export CXX=g++
 
+###############################################################################
 clang_10:
   extends: .gnu_build_template
 
@@ -72,38 +74,6 @@ clang_10:
     - export CC=clang
     - export CXX=clang++
 
-
-###############################################################################
-gcc_9_rebuild:
-  stage: build
-
-  image: irmb/virtualfluids-deps-ubuntu20.04
-
-  tags:
-    - gpu
-    - linux
-
-  before_script:
-    - export CCACHE_BASEDIR=$CI_PROJECT_DIR
-    - export CCACHE_DIR=$CI_PROJECT_DIR/cache
-    - ccache -s
-
-  script:
-    - mkdir -p $CI_PROJECT_DIR/build
-    - cd $CI_PROJECT_DIR/build
-    - rm -r -f ./*
-    - cmake ..
-      --preset=all_make_ccache
-      -DBUILD_WARNINGS_AS_ERRORS=ON
-      -DCMAKE_CUDA_ARCHITECTURES=60
-    - make -j4
-    - ccache -s
-
-  cache:
-    key: "$CI_JOB_NAME-$CI_COMMIT_REF_SLUG"
-    paths:
-      - $CI_PROJECT_DIR/cache
-
 ###############################################################################
 msvc_16:
   stage: build
@@ -146,7 +116,6 @@ msvc_16:
 ###############################################################################
 ##                             Build Python                                  ##
 ###############################################################################
-
 gcc_9_python:
   stage: build_python
 
@@ -168,7 +137,7 @@ gcc_9_python:
     - export CCACHE_DIR=$CI_PROJECT_DIR/cache
 
   script:
-    - python3 setup.py bdist_wheel
+    - python3 setup.py bdist_wheel build_ext --build-temp=build
 
 ###############################################################################
 ##                            Container Upload                               ##
@@ -615,7 +584,7 @@ sonar-scanner:
   variables:
     SONAR_HOST_URL: "http://gitlab-runner01.irmb.bau.tu-bs.de/sonarqube/"
 
-  needs: ["cppcheck","clang-tidy","gcov_gcc_9","gcc_9_rebuild"]
+  needs: ["cppcheck","clang-tidy","gcov_gcc_9"]
 
   before_script:
     - cd /tmp
diff --git a/setup.py b/setup.py
index 11676929cf55ad17742d37a7679a4d3e91ebb436..c5de9128136df9c769f0450f01e64234784040f0 100644
--- a/setup.py
+++ b/setup.py
@@ -15,7 +15,8 @@ vf_cmake_args = [
     "-DUSE_METIS=ON",
     "-DUSE_MPI=ON",
     "-DBUILD_SHARED_LIBS=OFF",
-    "-DBUILD_VF_UNIT_TESTS:BOOL=ON"
+    "-DBUILD_VF_UNIT_TESTS:BOOL=ON",
+    "-DBUILD_WARNINGS_AS_ERRORS=OFF"
 ]
 
 
diff --git a/sonar-project.properties b/sonar-project.properties
index 7f31fa97101d3002aa47096831206cf9768a85b5..a25bb1af8070f0ea5b75f67e624211f38fef38bf 100644
--- a/sonar-project.properties
+++ b/sonar-project.properties
@@ -27,8 +27,6 @@ sonar.cxx.clangtidy.reportPath=build/clangtidy.txt
 
 sonar.cxx.jsonCompilationDatabase=build/compile_commands.json
 
-sonar.cxx.gcc.reportPath=build/gcc_warnings.txt
-
 #sonar.cxx.valgrind.reportPath
 
 sonar.cxx.funccomplexity.threshold=10