RFC: Followup to PR91593

[Andreas Schwab]

On Sep 30 2019, Jerry DeLisle <jvdelisle@charter.net> wrote:

> The first attempt to fix (above) is completely off.  I have tried various
> combinations of code changes and I am beginning to think the warning is
> bogus:
>
> In function ‘btoa_big’,
>     inlined from ‘write_b’ at ../../../trunk/libgfortran/io/write.c:1217:11:
> ../../../trunk/libgfortran/io/write.c:1052:6: warning: writing 1 byte into
> a region of size 0 [-Wstringop-overflow=]
>  1052 |   *q = '\0';
>       |   ~~~^~~~~~

If len > sizeof (GFC_UINTEGER_LARGEST), then you are writing more than
GFC_BTOA_BUF_SIZE, don't you?

Andreas.

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Andreas Schwab, schwab@linux-m68k.org
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