[RFA:] stdint.h take 2: Add INTPTR_MIN, INTPTR_MAX, UINTPTR_MAX

[Jeff Johnston]

Patch checked in.  Thanks.

-- Jeff J.

Joseph S. Myers wrote:
> On Thu, 9 Apr 2009, Hans-Peter Nilsson wrote:
>
>   
>>  #if defined(__PTRDIFF_TYPE__)
>>  typedef signed __PTRDIFF_TYPE__ intptr_t;
>>  typedef unsigned __PTRDIFF_TYPE__ uintptr_t;
>> +#define INTPTR_MAX PTRDIFF_MAX
>> +#define INTPTR_MIN PTRDIFF_MIN
>> +#define UINTPTR_MAX (2UL * PTRDIFF_MAX + 1)
>>     
>
> This UINTPTR_MAX definition is wrong (so causing gcc.dg/c99-stdint-1.c to 
> fail) in the case where ptrdiff_t is int not long.  For long you want the 
> 2UL, for int you want 2U.  There doesn't seem to be an obvious way to get 
> the right choice; OK to commit this patch to use __UINTPTR_MAX__ for 
> compilers that define that (as is done with some other such macros where 
> getting the right definition seems problematic without compiler support)?
>
> 2009-04-24  Joseph Myers  <joseph@codesourcery.com>
>
> 	* libc/include/stdint.h (UINTPTR_MAX): Define to __UINTPTR_MAX__
> 	if __UINTPTR_MAX__ defined.
>
> Index: libc/include/stdint.h
> ===================================================================
> RCS file: /cvs/src/src/newlib/libc/include/stdint.h,v
> retrieving revision 1.14
> diff -u -r1.14 stdint.h
> --- libc/include/stdint.h	16 Apr 2009 18:29:51 -0000	1.14
> +++ libc/include/stdint.h	24 Apr 2009 13:20:37 -0000
> @@ -244,7 +244,11 @@
>  typedef unsigned __PTRDIFF_TYPE__ uintptr_t;
>  #define INTPTR_MAX PTRDIFF_MAX
>  #define INTPTR_MIN PTRDIFF_MIN
> +#ifdef __UINTPTR_MAX__
> +#define UINTPTR_MAX __UINTPTR_MAX__
> +#else
>  #define UINTPTR_MAX (2UL * PTRDIFF_MAX + 1)
> +#endif
>  #else
>  /*
>   * Fallback to hardcoded values, 
>
>