Re: Check for memset_explicit() and explicit_memset()

Hi,

On Mon, Feb 23, 2026 at 03:22:22PM +0000, Bertrand Drouvot wrote:
> Could we hit the same kind of issue as in [1] (when using -std=c11)?
>
> Asking because I can see (in [2]), that in glibc 2.43, memset_explicit is guarded
> that way (string/string.h):
>
> "
> #if defined __USE_MISC || __GLIBC_USE (ISOC23)
> /* Like memset, but the compiler will not delete a call to this
> function, even if S is dead after the call. */
> extern void *memset_explicit (void *__s, int __c, size_t __n)
> __THROW __nonnull ((1)) __fortified_attr_access (__write_only__, 1, 3);
> #endif
> "

I did more research on it and that seems to work with -std=c11. While
-std=c11 does not define __USE_MISC, the fact that we add -D_GNU_SOURCE by
default enables __USE_MISC.

Regards,

--
Bertrand Drouvot
PostgreSQL Contributors Team
RDS Open Source Databases
Amazon Web Services: https://aws.amazon.com