Fix #13268 FP: unusedFunction: [[maybe_unused]]

[chrchr-github]

No description provided.

[firewave]

There is also [[__maybe_unused__]] in C23 (and apparently it is also in C++17): https://en.cppreference.com/w/c/language/attributes/maybe_unused.

As well as [[gnu::unused]] and __attribute__((unused)): https://clang.llvm.org/docs/AttributeReference.html#maybe-unused-unused / https://gcc.gnu.org/onlinedocs/gcc-14.2.0/gcc/Common-Function-Attributes.html#index-unused-function-attribute.

[firewave]

There is also the used attribute: https://clang.llvm.org/docs/AttributeReference.html#used / https://gcc.gnu.org/onlinedocs/gcc-14.2.0/gcc/Common-Function-Attributes.html#index-used-function-attribute.

[firewave]

And there is https://trac.cppcheck.net/ticket/8535.

[chrchr-github]

Added support for __attribute__((unused)). The others must be handled in the tokenizer first.

[firewave]

LGTM but let's wait with the merge until the versions have been properly bumped.

[firewave]

Added support for __attribute__((unused)). The others must be handled in the tokenizer first.

I filed https://trac.cppcheck.net/ticket/13272 about the remaining cases.