Update dependency cppcheck to v2.21.0

[renovate]

This PR contains the following updates:

Package	Update	Change
cppcheck (source)	minor	==2.18.1 → ==2.21.0

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Release Notes

cppcheck-opensource/cppcheck (cppcheck)

v2.21.0: Cppcheck-2.21.0

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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.

v2.20.1

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v2.20.0: Cppcheck-2.20.0

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Release Notes for Cppcheck 2.20

GUI:

• Fix: The Misra C checkbox in "Edit Project" dialog is unchecked after reloading project.
• Fix: In the Misra Report, use proper icons according to misra classifications
• Fix: The platform files are not shown in the dropdown in ProjectFileDialog
• Troubleshooting: detailed progress view that shows what files the threads are working on

Changed interface:

• removed CMake option "DISABLE_CRTDBG_MAP_ALLOC"
• CMake option "BUILD_TESTS" has been deprecated and will be removed in Cppcheck 2.22 - use "BUILD_TESTING" instead

Other:

• The built-in "win*" and "unix*" platforms will now default to signed char type instead of unknown signedness. If you require unsigned chars please specify "--funsigned-char"
• bumped minimum required CMake version to 3.22
• Support inline polyspace suppressions

v2.18.3

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v2.18.2

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