I wouldn't be surprised if you could justify in a review the compiling with -Wall (probably more explicitly) catches this and therefore you can disregard the rule.
Not all compilers have a -Wall equivalent, GCC, Clang and MSVC does but RANDOM_EMBEDDED_CHIP's custom compiler might not and that is a valid target for MISRA compliance.
I doubt every single thing that needs MISRA get's compiled with an industry standard compiler, I wouldn't be surprised that GCC is the exception for most companies targeting MISRA compliance.
Not all compilers have a -Wall equivalent, GCC, Clang and MSVC does but RANDOM_EMBEDDED_CHIP's custom compiler might not and that is a valid target for MISRA compliance.
I doubt every single thing that needs MISRA get's compiled with an industry standard compiler, I wouldn't be surprised that GCC is the exception for most companies targeting MISRA compliance.