Rule 8.5: Declarations vs Redeclarations in MISRA C versus MISRA C++

[misra-c]

The intent of the MISRA-C and MISRA-C++ rules is the same in this area, however C and C++ use different terminology.
C does not use the term "re-declaration" and "declarations" refers both the first and subsequent declarations.

The following is a C example where it is dangerous to have multiple declarations.

Code:

File 1:
    int n;
File 2
    extern long n;

The linker may fail to notice the type mismatch.