No checkers enabled for clang-tidy when using .clang-tidy in 6.27.1

[swuerl]

Describe the bug
CodeChecker no longer finds enabled checkers for clang-tidy:

CodeChecker analyze ./build/compile_commands.json --analyzers clang-tidy -o reports -i.static_analysis.skip --analyzer-config clang-tidy:take-config-from-directory=true --analyzer-config clang-tidy:cc-verbatim-args-file=.tidy-args || true
[ERROR 2026-01-05 12:44] - Binary /usr/bin/diagtool not found
[INFO 2026-01-05 12:44] - No checkers enabled for clang-tidy
[INFO 2026-01-05 12:44] - Enabled checker list can be found in reports/metadata.json
[INFO 2026-01-05 12:44] - Starting static analysis ...
[INFO 2026-01-05 12:44] - ----==== Summary ====----
[INFO 2026-01-05 12:44] - Total analyzed compilation commands: 432
[INFO 2026-01-05 12:44] - Skipped compilation commands: 910
[INFO 2026-01-05 12:44] - ----=================----
[INFO 2026-01-05 12:44] - Analysis finished.
[INFO 2026-01-05 12:44] - To view results in the terminal use the "CodeChecker parse" command.
[INFO 2026-01-05 12:44] - To store results use the "CodeChecker store" command.
[INFO 2026-01-05 12:44] - See --help and the user guide for further options about parsing and storing the reports.
[INFO 2026-01-05 12:44] - ----=================----
[INFO 2026-01-05 12:44] - Analysis length: 0.05321502685546875 sec.

CodeChecker version

Broken in 6.27.1

Works by downgrading to 6.26.2

To Reproduce

Use CodeChecker with analyzers clang-tidy and a .clang-tidy file

Expected behaviour

Expected 6.27.1 to behave like 6.26.2 and correctly determine the checkers enabled in .clang-tidy

Desktop (please complete the following information)

• OS: Ubuntu 24.04
• clang-tidy 21

Additional context

Can be fixed/broken by just updating CodeChecker in the same environment

[bruntib]

Hi @swuerl,

diagtool is a binary shipped together with clang/clang-tidy. This can be used for gathering compiler warnings. CodeChecker uses this binary to identify traditional compiler warnings as checkers. According to your log messages, diagtool is not found on your machine. Could you make sure, that it is available in your environment?

If you installed diagtool, and the problem still occurs, then could you attack the .clang-tidy file, please?

Thank you!

[bruntib]

By the way, in the previous releases there was a problem, that CodeChecker found a wrong diagtool binary, not the one which matches the version with the actual clang-tidy analyzer. This has been fixed, so the current issue may be caused by this.

[bruntib]

@swuerl, I couldn't reproduce the issue. Could you, please, attach the .tidy-args and .tidy-args files? Thank you!

[bruntib]

I close this ticket due to inactivity. Please, let me know if the issue still persists. Also, make sure that diagtool is installed properly. Thank you!