Linters / SAST tools to warn on ambiguous data types

Prithee, which C/C++ analyzers warn on ambiguous data types? I gather that `char` is platform specific.

Generally recommend explicit `int8_t` or `unsigned char` instead.

Perhaps some case can be made that deep system code, such as kernels, standard libraries, Generics/templates, and/or embedded work may have a need for platform relative implicit `char` signage. But I wonder if the everyday library or application would benefit from such checks.

Do gcc, clang, vera, cppcheck, etc. offer such a rule?

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