bug#23758: 25.1.50; Bogus warning from -Wwrite-strings

[Ken Brown]

I'm getting an "assignment discards ‘const’ qualifier from pointer
target type" warning in the Cygwin-w32 build because of the following
code in w32fns.c:

char *type_CtrlAlt = NULL;
[...]
type_CtrlAlt = "bB";

This warning goes away if I remove -Wwrite-strings from the enabled 
compiler warnings.  Is this a compiler bug, or is there really something 
wrong with the code above that should warrant a warning?


In GNU Emacs 25.1.50.11 (x86_64-unknown-cygwin)
 of 2016-06-12 built on moufang
Repository revision: eacdc9eb6c89346fb72535632a1c65f6483b639f
Windowing system distributor 'Microsoft Corp.', version 10.0.10586

Configured using:
 'configure 'CFLAGS=-g3 -O0' --with-w32'