gcovr filtering steps

[sdarwin]

It looks like Claude over-simplified.

In build.sh there are multiple steps:

# Pass 1: Collect raw coverage as JSON
gcovr --merge-mode-functions separate -p \
    --merge-lines \
    --exclude-unreachable-branches \
    --exclude-throw-branches \
    --exclude '.*/test/.*' \
    --exclude '.*/extra/.*' \
    --filter "$GCOVRFILTER" \
    --json "$outputlocation/coverage-raw.json"

# Fix paths in JSON
python3 "../scripts/fix_paths.py" \
    "$outputlocation/coverage-raw.json" \
    "$outputlocation/coverage-fixed.json" \
    --repo "$REPONAME"

# Create symlinks so gcovr can find source files at repo-relative paths
ln -sfn "$BOOST_CI_SRC_FOLDER/include" "$(pwd)/include" 2>/dev/null || true
ln -sfn "$BOOST_CI_SRC_FOLDER/src" "$(pwd)/src" 2>/dev/null || true

# Pass 2: Generate HTML from fixed JSON
gcovr -a "$outputlocation/coverage-fixed.json" \
    --html-nested \
    --no-html-self-contained \
    --html-template-dir=../templates/html \
    --html-title "$REPONAME" \
    --html \
    --output "$outputlocation/index.html" \
    --json-summary-pretty \

Which --options must be included in each steps?

It seems "--merge-lines" must also be in Pass 2. It's missing. Otherwise the reports overcount lines.

And (possibly but uncertain) "--merge-mode-functions separate" also. Just to be safe.

"Pass 2" appears twice in build.sh so modifications should be done in multiple places.

@julioest