mozilla/grcov

Health v2 · maintenance only

Adoption not part of the score

1361 stars · 171 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

grcov is a fast Rust-based CLI tool that collects and aggregates code coverage data from multiple source files. It processes .profraw and .gcda files from LLVM/Clang and GCC, plus lcov, Go, and JaCoCo coverage formats, and outputs reports as HTML, lcov, Coveralls, Cobertura, and more.

Use cases

• generate code coverage reports for a Rust project
• aggregate C/C++ gcda coverage files into an HTML report
• upload coverage to Coveralls from CI
• merge coverage from multiple test runs and languages
• produce lcov or cobertura output for a coverage service
• collect JavaScript and Java coverage alongside native code coverage

When to choose

• you need a fast, single-binary coverage aggregator across C/C++, Rust, Go, Java, or JS
• you want CI-friendly outputs like Coveralls, lcov, or Cobertura
• you're working in a Mozilla/Firefox-style multi-language build pipeline

When to avoid

• you only need simple line coverage for a pure-Python or pure-Ruby project where native tooling suffices
• you need IDE-integrated live coverage rather than report generation
• you require platforms beyond Linux, macOS, or Windows

Facets

cli-tool · maturity active

testing developer-tools ci-cd developer-tools testing windows cli rust code-coverage coverage-reporting llvm gcc lcov coveralls cobertura linux macos

Member repositories

For agents

markdown · JSON · MCP: product_card(name="mozilla/grcov")