tooling: use lcov instead of llvm-cov as default compiler is gcc

.github/workflows/llvm_cov.yml → .github/workflows/coverage.yml

@@ -6,7 +6,7 @@ on:  # yamllint disable-line rule:truthy
     branches: ['*']
 
 jobs:
-  llvm-cov:
+  lcov:
     runs-on: ubuntu-latest
     container:
       image: dtors/base-cpp:latest
@@ -16,5 +16,5 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Run Coverage Script
-        run: bazelisk run //tools/coverage:llvm_cov --platforms=//bazel/platforms:x86_64_linux -- -t //examples/cpp:test -s
+        run: bazelisk run //tools/coverage:lcov --platforms=//bazel/platforms:x86_64_linux -- -t //examples/cpp:test
         shell: bash

tools/coverage/BUILD

@@ -2,3 +2,8 @@ sh_binary(
     name = "llvm_cov",
     srcs = ["llvm_cov.sh"],
 )
+
+sh_binary(
+    name = "lcov",
+    srcs = ["lcov.sh"],
+)

tools/coverage/lcov.sh

@@ -0,0 +1,58 @@
+#!/bin/bash
+
+set -e
+
+usage() {
+    echo "  -t BAZEL_TESTS         The test target (e.g., //path/to/test-target)"
+    echo "  -o OUTPUT_DIR          Directory for output (default is temp directory)"
+    echo "  -h                     Display this help message"
+}
+
+while getopts "t:o:h" option; do
+    case "${option}" in
+    t) BAZEL_TESTS=${OPTARG} ;;
+    o) OUTPUT_DIR=${OPTARG} ;;
+    h | *)
+        usage
+        exit 1
+        ;;
+    esac
+done
+
+if [[ -z "${BAZEL_TESTS}" ]]; then
+    echo "ERROR: Missing required arguments."
+    usage
+    exit 1
+fi
+
+OUTPUT_DIR="${OUTPUT_DIR:-"$(mktemp -d)/cov_report"}"
+
+echo "INFO: Tests target: ${BAZEL_TESTS}"
+echo "INFO: Output directory: ${OUTPUT_DIR}"
+
+readonly WORKSPACE=$(cd "$(dirname "$(readlink -f "${0}")")" && bazel info workspace)
+
+function run_coverage_tests() {
+    echo -e "\nINFO: Run test targets\n"
+    bazel coverage \
+        --nocache_test_results \
+        --experimental_fetch_all_coverage_outputs \
+        --experimental_split_coverage_postprocessing \
+        --strategy=CoverageReport=local \
+        --combined_report=lcov \
+        -- ${BAZEL_TESTS}
+}
+
+function calculate_coverage() {
+    echo -e "\nINFO: Generating HTML coverage report\n"
+    genhtml --branch-coverage --output genhtml "$(bazel info output_path)/_coverage/_coverage_report.dat"
+}
+
+function main() {
+    pushd "${WORKSPACE}" || return
+    run_coverage_tests
+    calculate_coverage
+    popd || return
+}
+
+main