diff --git a/.codecov.yml b/.codecov.yml
index 7d98ceb3..2f03ebbe 100644
--- a/.codecov.yml
+++ b/.codecov.yml
@@ -6,7 +6,8 @@ ignore:
   - /modules/modpython/znc_core.py
   - /modules/modperl/ZNC.pm
 fixes:
-  - "usr/local/lib/znc/::modules/"  # C++ and Python seem to work without this, but Perl needs this.
+  - "usr/local/lib/znc/::modules/"
+  - "/usr/local/lib/znc/::modules/"
 codecov:
   ci:
     # Cygwin fails integration test with --coverage enabled, I don't know why
diff --git a/.github/build.sh b/.github/build.sh
index 7007806d..3a277a6b 100644
--- a/.github/build.sh
+++ b/.github/build.sh
@@ -7,25 +7,17 @@ cpanm --local-lib=~/perl5 local::lib
 eval $(perl -I ~/perl5/lib/perl5/ -Mlocal::lib)
 cpanm --notest Devel::Cover::Report::Clover
 pip3 install --user coverage
-export ZNC_MODPERL_COVERAGE=1"
-export ZNC_MODPYTHON_COVERAGE=1"
+export ZNC_MODPERL_COVERAGE=1
+#export ZNC_MODPYTHON_COVERAGE=1
 
-case "$RUNNER_OS" in
-	Linux)
-		CXX_FOR_COV=$CXX
+case "${CC:-gcc}" in
+	gcc)
+		export CXXFLAGS="$CXXFLAGS --coverage"
+		export LDFLAGS="$LDFLAGS --coverage"
 		;;
-	macOS)
-		CXX_FOR_COV=clang++
-		;;
-esac
-case "$CXX_FOR_COV" in
-	g++)
-		CXXFLAGS+=" --coverage"
-		LDFLAGS+=" --coverage"
-		;;
-	clang++)
-		CXXFLAGS+=" -fprofile-instr-generate -fcoverage-mapping"
-		LDFLAGS+=" -fprofile-instr-generate"
+	clang)
+		export CXXFLAGS="$CXXFLAGS -fprofile-instr-generate -fcoverage-mapping"
+		export LDFLAGS="$LDFLAGS -fprofile-instr-generate"
 		;;
 esac
 
@@ -41,16 +33,20 @@ sudo make install
 
 # TODO: use DEVEL_COVER_OPTIONS for https://metacpan.org/pod/Devel::Cover
 env LLVM_PROFILE_FILE="$PWD/inttest.profraw" ZNC_MODPERL_COVERAGE_OPTS="-db,$PWD/cover_db" PYTHONWARNINGS=error make VERBOSE=1 inttest
+ls -lRa
 
-case "$RUNNER_OS" in
-	Linux)
-		~/perl5/bin/cover --no-gcov --report=clover
+~/perl5/bin/cover --no-gcov --report=clover
+
+case "${CC:-gcc}" in
+	gcc)
+		lcov --directory . --capture --output-file lcov-coverage.txt
+		lcov --list lcov-coverage.txt
 		;;
-	macOS)
-		xcrun llvm-profdata merge unittest.profraw -o unittest.profdata
-		xcrun llvm-profdata merge inttest.profraw -o inttest.profdata
-		xcrun llvm-cov show -show-line-counts-or-regions -instr-profile=unittest.profdata test/unittest_bin > unittest-cmake-coverage.txt
-		xcrun llvm-cov show -show-line-counts-or-regions -instr-profile=inttest.profdata /usr/local/bin/znc > inttest-znc-coverage.txt
-		find /usr/local/lib/znc -name '*.so' -or -name '*.bundle' | while read f; do xcrun llvm-cov show -show-line-counts-or-regions -instr-profile=inttest.profdata $f > inttest-$(basename $f)-coverage.txt; done
+	clang)
+		llvm-profdata merge unittest.profraw -o unittest.profdata
+		llvm-profdata merge inttest.profraw -o inttest.profdata
+		llvm-cov show -show-line-counts-or-regions -instr-profile=unittest.profdata test/unittest_bin > unittest-cmake-coverage.txt
+		llvm-cov show -show-line-counts-or-regions -instr-profile=inttest.profdata /usr/local/bin/znc > inttest-znc-coverage.txt
+		find /usr/local/lib/znc -name '*.so' -or -name '*.bundle' | while read f; do llvm-cov show -show-line-counts-or-regions -instr-profile=inttest.profdata $f > inttest-$(basename $f)-coverage.txt; done
 		;;
 esac
diff --git a/.github/ubuntu_deps.sh b/.github/ubuntu_deps.sh
index 535992ce..30684cd8 100644
--- a/.github/ubuntu_deps.sh
+++ b/.github/ubuntu_deps.sh
@@ -1,3 +1,4 @@
 sudo apt-get update
-sudo apt-get install -y tcl-dev libsasl2-dev libicu-dev swig qtbase5-dev libboost-locale-dev libperl-dev cpanminus gettext
+sudo apt-get install -y tcl-dev libsasl2-dev libicu-dev swig qtbase5-dev libboost-locale-dev libperl-dev cpanminus gettext clang llvm lcov
+sudo apt-get upgrade -y
 
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 81958aa6..d5a4649d 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -15,6 +15,12 @@ jobs:
       - run: source .github/ubuntu_deps.sh
       - run: source .github/build.sh
       - uses: codecov/codecov-action@v1
+        with:
+          name: ${{ github.job }}
+      - uses: actions/upload-artifact@v2
+        with:
+          name: codecov debug results ${{ github.job }}
+          path: "/tmp/codecov.*.gz"
 
   tarball:
     name: Tarball
@@ -31,6 +37,8 @@ jobs:
           export CFGFLAGS="--with-gtest=$GITHUB_WORKSPACE/third_party/googletest/googletest --with-gmock=$GITHUB_WORKSPACE/third_party/googletest/googlemock --disable-swig"
           source $GITHUB_WORKSPACE/.github/build.sh
       - uses: codecov/codecov-action@v1
+        with:
+          name: ${{ github.job }}
 
   # can be removed when asan below is fixed
   clang:
@@ -38,6 +46,7 @@ jobs:
     runs-on: ubuntu-20.04
     env:
       CXX: clang++
+      CC: clang
     steps:
       - uses: actions/checkout@v2
         with:
@@ -45,6 +54,12 @@ jobs:
       - run: source .github/ubuntu_deps.sh
       - run: source .github/build.sh
       - uses: codecov/codecov-action@v1
+        with:
+          name: ${{ github.job }}
+      - uses: actions/upload-artifact@v2
+        with:
+          name: codecov debug results ${{ github.job }}
+          path: "/tmp/codecov.*.gz"
 
  
   #clang_asan:
@@ -52,6 +67,7 @@ jobs:
     #runs-on: ubuntu-20.04
     #env:
       #CXX: clang++
+      #CC: clang
       #CXXFLAGS: "-fsanitize=address -O1 -fno-omit-frame-pointer -fno-optimize-sibling-calls -fPIE"
       #LDFLAGS: "-fsanitize=address -pie"
     #steps:
@@ -67,6 +83,7 @@ jobs:
     #runs-on: ubuntu-20.04
     #env:
       #CXX: clang++
+      #CC: clang
       #CXXFLAGS: "-fsanitize=thread -O1 -fPIE"
       #LDFLAGS: "-fsanitize=thread"
     #steps: