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The C Standard identifies four situations in which undefined behavior (UB) may arise as a result of incompatible declarations of the same function or object:

Although the effect of two incompatible declarations simply appearing in the same program may be benign on most implementations, the effects of invoking a function through an expression whose type is incompatible with the function definition are typically catastrophic. Similarly, the effects of accessing an object using an lvalue of a type that is incompatible with the object definition may range from unintended information exposure to memory overwrite to a hardware trap.

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/* In bashline.h */
extern char * bash_groupname_completion(const char *, int);   

/* In a.c */
#include "bashline.h"

void f(const char *s, int i) {
  bash_groupname_completion(s, i);  
}

/* In b.c */
int bash_groupname_completion_funct; 

Risk Assessment

Automated Detection

Related Guidelines

Key here (explains table format and definitions)

Bibliography

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