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Re: [PATCH v2] Add reallocarray function.

From: Paul Eggert <eggert at cs dot ucla dot edu>
To: Florian Weimer <fw at deneb dot enyo dot de>, Dennis Wölfing <denniswoelfing at gmx dot de>
Cc: libc-alpha at sourceware dot org
Date: Mon, 17 Apr 2017 07:34:00 -0700
Subject: Re: [PATCH v2] Add reallocarray function.
Authentication-results: sourceware.org; auth=none
References: <20170410150053.10208-1-denniswoelfing@gmx.de> <20170417140148.23212-1-denniswoelfing@gmx.de> <874lxnf6jw.fsf@mid.deneb.enyo.de>

On 04/17/2017 07:32 AM, Florian Weimer wrote:

* Dennis Wölfing:

+static inline bool
+check_mul_overflow (size_t l, size_t r, INTERNAL_SIZE_T *result)
+{
+#if __GNUC__ >= 5
+  return __builtin_mul_overflow (l, r, result);

This is not correct for size_t != INTERNAL_SIZE_T.


Why not? Could you give an example?

References:
- [PATCH] Add reallocarray function.
  - From: Dennis Wölfing
- [PATCH v2] Add reallocarray function.
  - From: Dennis Wölfing
- Re: [PATCH v2] Add reallocarray function.
  - From: Florian Weimer

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