Hi all,

the following works for me. I have only tried a normal build (where it
does silence the same warning) and not an LTO build and I just believed
the comment - see attached patch. Comments?

On 28.09.23 08:25, Richard Biener via Fortran wrote:

> This particular place in libgfortran has
>
>    /* write_z, which calls xtoa_big, is called from transfer.c,
>       formatted_transfer_scalar_write.  There it is passed the kind as
>       argument, which means a maximum of 16.  The buffer is large
>       enough, but the compiler does not know that, so shut up the
>       warning here.  */
> #pragma GCC diagnostic push
> #pragma GCC diagnostic ignored "-Wstringop-overflow"
>    *q = '\0';
> #pragma GCC diagnostic pop
>
> so obviously the #pragma doesn't survive through LTO.  Somehow I think
> this is a known bug, but maybe I misremember (I think we are not streaming
> any of the ad-hoc location parts).

I have replaced it now by the assert that "len <= 16", i.e.

+  if (len > 16)
+    __builtin_unreachable ();

Build + tested on x86-64-gnu-linux
Comment? OK for mainline?

Tobias
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