[Bug middle-end/49905] Better sanity checking on sprintf src & dest to produce warning for dodgy code ?

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=49905

--- Comment #11 from David Binderman <dcb314 at hotmail dot com> ---
(In reply to Jakub Jelinek from comment #10)
> I think the warning code should compute both
> minimum and maximum, 

I'd be happy for the code to compute minimum only and have maximum
postponed for the future. One step at a time.

BTW, I tried a Linux kernel build and got this

drivers/char/ipmi/ipmi_msghandler.c: In function ‘guid_show’:
drivers/char/ipmi/ipmi_msghandler.c:2365:9: internal compiler error: in
format_integer, at c-family/c-format.c:506
  return snprintf(buf, 100, "%Lx%Lx\n",
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    (long long) bmc->guid[0],
    ~~~~~~~~~~~~~~~~~~~~~~~~~
    (long long) bmc->guid[8]);
    ~~~~~~~~~~~~~~~~~~~~~~~~~

So it looks to me like format %Lx isn't handled.