newlib header breaks restricted pointers in C++

[Sebastian Huber]

On 27.07.23 11:00, Corinna Vinschen wrote:
> Let's compare with the GLibc version:
> 
>    /* __restrict is known in EGCS 1.2 and above, and in clang.
>       It works also in C++ mode (outside of arrays), but only when spelled
>       as '__restrict', not 'restrict'.  */
>    #if !(__GNUC_PREREQ (2,92) || __clang_major__ >= 3)
>    # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
>    #  define __restrict    restrict
>    # else
>    #  define __restrict    /* Ignore */
>    # endif
>    #endif
> 
> So the expression is the same, just the version check makes more sense.
> 
> Shall we match our version expression to the GLibc expression?

Yes, this makes sense. However, do we care about GCC < 2.92 and clang < 3?

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