linux-kernel - Re: [PATCH v3 05/14] tools/nolibc: stdint: use int for size

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Date:   Sat, 5 Aug 2023 18:19:29 +0200
From:   Willy Tarreau <w@....eu>
To:     Thomas Weißschuh <linux@...ssschuh.net>
Cc:     Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org, Yuan Tan <tanyuan@...ylab.org>,
        Zhangjin Wu <falcon@...ylab.org>
Subject: Re: [PATCH v3 05/14] tools/nolibc: stdint: use int for size_t on
 32bit

Hi Thomas,

On Thu, Aug 03, 2023 at 09:28:49AM +0200, Thomas Weißschuh wrote:
> Otherwise both gcc and clang may generate warnings about type
> mismatches:
> 
> sysroot/mips/include/string.h:12:14: warning: mismatch in argument 1 type of built-in function 'malloc'; expected 'unsigned int' [-Wbuiltin-declaration-mismatch]
>    12 | static void *malloc(size_t len);
>       |              ^~~~~~
> 
> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
> ---
>  tools/include/nolibc/stdint.h | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/tools/include/nolibc/stdint.h b/tools/include/nolibc/stdint.h
> index 4b282435a59a..0f390c3028d8 100644
> --- a/tools/include/nolibc/stdint.h
> +++ b/tools/include/nolibc/stdint.h
> @@ -15,7 +15,11 @@ typedef unsigned int       uint32_t;
>  typedef   signed int        int32_t;
>  typedef unsigned long long uint64_t;
>  typedef   signed long long  int64_t;
> +#if __SIZE_WIDTH__ == 64
>  typedef unsigned long        size_t;
> +#else
> +typedef unsigned int         size_t;
> +#endif

This one breaks gcc < 7 for me because __SIZE_WIDTH__ is not defined
there. However I could trace __SIZE_TYPE__ to be defined since at least
gcc-3.4 so instead we can do this, which will always match the type set
by the compiler (either "unsigned int" or "unsigned long int") :

  #ifdef __SIZE_TYPE__
  typedef __SIZE_TYPE__ size_t;
  #else
  typedef unsigned long size_t;
  #endif

Please just let me know if you want me to modify your patch accordingly.
I'm still continuing the tests.

Thanks,
Willy