Release Notes for Cppcheck 2.21 Major bug fixes & crashes:

• Fixed potential crash with incomplete preprocessor directive
• Fixed hang in createAst
• Fixed invalid AST for braced initialization and references/pointers
• Fixed cppcheckError with array typedef
• Fixed recheck which now correctly excludes non selected files
• Fixed potential crash when rechecking files in gui New checks:
• MISRA C 2012 rule 10.3 now warns on assigning integer literals 0 and 1 to bool in C99 and later while preserving the existing C89 behavior.
• funcArgNamesDifferentUnnamed warns on function declarations/definitions where a parameter in either location is unnamed
• uninitMemberVarNoCtor warns on user-defined types where (1) some but not all members requiring initialization have in-class initializers or (2) there is a mixture of members which do/do not require initialization.
• fcloseInLoopCondition warns when fclose() is used as a while loop condition, which may skip the loop body or double-close the file handle. C/C++ support:
• import project: include path in compile_commands.json now handled correctly GUI:
• Removed handling of Cppcheck Premium LOC license Other:
• Make it possible to specify the regular expression engine using the engine element in a rule XML.
• Added CLI option --exitcode-suppress to specify an error ID which should not result in a non-zero exitcode.
• Moved source code from https://github.com/danmar/cppcheck to https://github.com/cppcheck-opensource/cppcheck
• The official Windows binary is now built with Visual Studio 2026.
• Updated simplecpp to 1.7.0.