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Revamp code coverage tooling #30181

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Merged
dotnwat merged 4 commits into from
Apr 29, 2026
Merged

Revamp code coverage tooling #30181

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2639b8f
tools: remove previous generation of coverage tools
dotnwat Apr 17, 2026
87809d7
tools: add run-cov coverage testing tool
dotnwat Apr 17, 2026
8ccd42a
tools: add test for run-cov tool
dotnwat Apr 17, 2026
0bd9c1f
claude: add skill for code coverage
dotnwat Apr 17, 2026
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8 changes: 1 addition & 7 deletions .bazelrc
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Expand Up @@ -283,16 +283,10 @@ build:stamp-full --stamp --workspace_status_command='./bazel/stamp_vars.sh full'
# Coverage
# =================================
coverage --config=coverage
build:coverage --action_env=BAZEL_USE_LLVM_NATIVE_COVERAGE=1
build:coverage --action_env=GCOV=llvm-profdata
build:coverage --copt=-DNDEBUG
build:coverage --define=dynamic_link_tests=true
build:coverage --repo_env=BAZEL_USE_LLVM_NATIVE_COVERAGE=1
build:coverage --combined_report=lcov
build:coverage --experimental_use_llvm_covmap
build:coverage --experimental_generate_llvm_lcov
build:coverage --experimental_split_coverage_postprocessing
build:coverage --experimental_fetch_all_coverage_outputs
build:coverage --collect_code_coverage
Comment on lines -286 to -295
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@dotnwat dotnwat Apr 20, 2026

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i copied these settings from another c++ project two years ago. i don't know how much of that is old bazel versions vs secret magic settings. in any case, with these simplified settings coverage passes the spot testing i've been doing.

build:coverage --instrumentation_filter="^//src/v[/:]"

# sanitizer is a deprecated alias for debug
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1 change: 1 addition & 0 deletions .gitignore
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Expand Up @@ -138,6 +138,7 @@ coverage.xml
.hypothesis/
.pytest_cache/
genhtml/
coverage-out/

# Translations
*.mo
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2 changes: 2 additions & 0 deletions tools/BUILD
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Expand Up @@ -3,6 +3,8 @@ load("@rules_pkg//pkg:tar.bzl", "pkg_tar")
load("@rules_python//python:defs.bzl", "py_binary")
load("@rules_shell//shell:sh_binary.bzl", "sh_binary")

exports_files(["run-cov"])

buildifier(
name = "buildifier.check",
exclude_patterns = [
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289 changes: 0 additions & 289 deletions tools/coverage_dash.py
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