Clazy 1.15 Released – New Checks, Better Stability

Sunday, 15 June 2025  |  Alexander Lohnau

🎉 New Clazy Release: Stability Boost & New Checks!

We’re excited to roll out a new Clazy release packed with bug fixes, a new check, and improvements to existing checks. This release included 34 commits from 5 contributors.

🔍 New Features & Improvements

  • New Check: readlock-detaching
    Detects unsafe and likely unwanted detachment of member-containers while holding a read lock. For example, when calling .first() on the mutable member instead of .constFirst()

  • Expanded Support for Detaching Checks
    Additional methods now covered when checking for detaching temporary or member lists/maps. This includes reverse iterators on many Qt containers and keyValueBegin/keyValueEnd on QMap. All those methods have const counterparts that allow you to avoid detaching.

  • Internal Changes With this release, Clang 19 or later is a required dependency. All older versions needed compatibility logic and were not thouroughly tested on CI. In case you are on an older Version of a Debian based distro, consider using https://apt.llvm.org/ and compile Clazy from source ;)

🐞 Bug Fixes

  • install-event-filter: Fixed crash when no child exists at the given depth.
    BUG: 464372

  • fully-qualified-moc-types: Now properly evaluates enum and enum class types.
    BUG: 423780

  • qstring-comparison-to-implicit-char: Fixed and edgecase where assumptions about function definition were fragile.
    BUG: 502458

  • fully-qualified-moc-types: Now evaluates complex signal expressions like std::bitset<int(8)> without crashing. #28

  • qvariant-template-instantiation: Crash fixed for certain template patterns when using pointer types.

Also, thanks to Christoph Grüninger, Johnny Jazeix, Marcel Schneider and Andrey Rodionov for contributing to this release!