Re: [lwip-devel] [bug #35587] Uninitialized pointer

[Simon Goldschmidt]

Mason <address@hidden> wrote:
> > For example MISRA 2004 Rule Number 9.1: "All automatic
> > variables shall have been assigned a value before being used.".
> 
> "Automatic" variable is short-hand for automatic storage duration.
> These are so-called "local" variables.
> 
> next_timeout, on the other hand, has static storage duration.
> 
> cf. 3.1.2.4 Storage durations of objects

Also see ISO9899, 6.7.8 item 10:

"If an object that has automatic storage duration is not initialized 
explicitly, its value is indeterminate. If an object that has static storage 
duration is not initialized explicitly, then:

— if it has pointer type, it is initialized to a null pointer;
— if it has arithmetic type, it is initialized to (positive or unsigned) zero;
[..]"

Given this, it is of course required to initialize automatic (local) variables, 
but static (global) variables *are* initialized by the startup code (if it 
follows the standard).

Simon
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