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Suspicious warning in W64 build

From: Angelo Graziosi
Subject: Suspicious warning in W64 build
Date: Tue, 5 Sep 2017 15:38:15 +0200 (CEST)

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'
  CC       w32xfns.o

I wonder if we can be comfortable with it...

BTW, I see also a lot a lot of messages (surely harmless) like this:

C:/msys64/tmp/src/lisp/calendar/cal-loaddefs.el and 
c:/msys64/tmp/src/lisp/calendar/cal-loaddefs.el are the same file


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