ci: generate detailed code coverage report via gcovr

Change-Id: I41022928b778acdbe4319a2808cf5b3db337a2fa
diff --git a/.jenkins.d/30-coverage.sh b/.jenkins.d/30-coverage.sh
index 7a6bea0..6a6db85 100755
--- a/.jenkins.d/30-coverage.sh
+++ b/.jenkins.d/30-coverage.sh
@@ -2,12 +2,16 @@
 set -ex
 
 if [[ $JOB_NAME == *"code-coverage" ]]; then
-    # Generate an XML report (Cobertura format) using gcovr
-    gcovr --object-directory=build \
-          --output=build/coverage.xml \
-          --exclude="$PWD/tests" \
-          --root=. \
-          --xml
+    # Generate an XML report (Cobertura format) and a detailed HTML report using gcovr
+    # Note: trailing slashes are important in the paths below. Do not remove them!
+    gcovr -j$WAF_JOBS \
+          --object-directory build \
+          --filter src/ \
+          --exclude-throw-branches \
+          --exclude-unreachable-branches \
+          --print-summary \
+          --html-details build/gcovr/ \
+          --xml build/coverage.xml
 
     # Generate a detailed HTML report using lcov
     lcov --quiet \