Re: Suspicious warning in W64 build

[Richard Copley]

On 7 September 2017 at 18:52, Richard Copley <address@hidden> wrote:
> On 7 September 2017 at 16:42, Angelo Graziosi <address@hidden> wrote:
>>> Il 7 settembre 2017 alle 17.16 Eli Zaretskii <address@hidden> ha scritto:
>>> > Date: Tue, 5 Sep 2017 15:38:15 +0200 (CEST)
>>> > From: Angelo Graziosi <address@hidden>
>>> >
>>> > In the log build of current master on MSYS2/MINGW64, I see:
>>> >
>>> > [...]
>>> > CC       w32term.o
>>> > C:/msys64/tmp/src/src/w32font.c: In function 'w32font_text_extents':
>>> > C:/msys64/tmp/src/src/w32font.c:547:9: warning: argument 1 range 
>>> > [18446744065119617024, 18446744073709551612] exceeds maximum object size 
>>> > 9223372036854775807 [-Walloc-size-larger-than=]
>>> >    wcode = alloca (nglyphs * sizeof (WORD) * 2);
>>> >          ^
>>> > C:/msys64/tmp/src/src/w32font.c:547:9: note: in a call to built-in 
>>> > allocation function '__builtin_alloca'
>>>
>
>>> Where did it take these 2 numbers?
>
> I also see the warning (I use the same toolchain).
>
> 18446744065119617024 is 1<<64.
> The other number is (1<<64) - (1<<33) - (1<<2).
>
> That's just crazy. It must be a GCC bug.

"https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79929";.