Use gcov for coverage in CI rather that kcov

.github/workflows/ci.yml

@@ -1572,6 +1572,8 @@ jobs:
           then
             cxx_flags="${cxx_flags} -fno-omit-frame-pointer"
           fi
+          echo ${{ matrix.config.name }} | grep -q -e '^Windows" || cxx_flags="${cxx_flags} --coverage"
+
           cmake \
               -S . \
               -B build \
@@ -1598,17 +1600,18 @@ jobs:
           ./build/test/self_test
 
       - name: Collect coverage
-        if: (startsWith(matrix.config.name, 'Linux'))
-        shell: bash
+        if: (!startsWith(matrix.config.name, 'windows'))
         run: |
-          kcov --skip-solibs --include-pattern=trompeloeil.hpp ./coverage ./build/test/self_test || true
+          COV=`echo "${{ matrix.config.name }}}" | grep -q -e "Linux.*Clang" && echo "llvm-cov gcov"|| echo gcov`
+          ${COV} -abcfup `find build/test -name "*.gcno"`
+          ls *.gcov| grep -v 'include#trompeloeil'|xargs rm
 
       - name: Upload coverage
-        if: startsWith(matrix.config.name, 'Linux') && github.repository == 'rollbear/trompeloeil'
+        if: (!startsWith(matrix.config.name, 'windows')) && github.repository == 'rollbear/trompeloeil'
         uses: codecov/codecov-action@v3
         with:
-          directory: coverage
-          files: self_test*/cobertura.xml
-          name: ${{ matrix.config.name }}
+          gcov_include: "include/trompeloeil"
+          name: "${{ matrix.config.name }}"
           fail_ci_if_error: false
           verbose: true
+