[previous] 0626 [next] [U] '%s' has different type to previous declaration (which is no longer in scope).
Explicitly undefined REFERENCE - ISO:C90-6.1.2.6 Compatible Type and Composite Type

This global object or function has been declared previously in a different scope but the 2 declarations are different. This will result in undefined behavior.

For example: 


/*PRQA S 2017,2211,3205,3221,3222,3408,3447 ++*/


extern void foo1(void)
{
    extern int glob;
    extern void gf1(void);
}

extern void foo2(void)
{
    extern long glob;                   /* Message 0626 */
    extern void gf1(int x);             /* Message 0626 */
}

QA·C Source Code Analyser 8.1.2
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