[Octave-bug-tracker] [bug #65318] Deprecation warning with C++20

[Philip Nienhuis]

Follow-up Comment #13, bug#65318 (group octave):

When cross-compiling (mxe) Octave-10.0.0 I get a compile error:

:
/home/philip/devel/octdev/mxe/mxe_64b_20240131H/tmp-default-octave/octave-10.0.0/libinterp/corefcn/sysdep.cc:
At global scope:
/home/philip/devel/octdev/mxe/mxe_64b_20240131H/tmp-default-octave/octave-10.0.0/libinterp/corefcn/sysdep.cc:888:1:
warning: 'void octave::reg_close_key_wrapper(HKEY)' defined but not used
[-Wunused-function]
  888 | reg_close_key_wrapper (HKEY key)
      | ^~~~~~~~~~~~~~~~~~~~~
make[4]: *** [Makefile:20229: libinterp/corefcn/libcorefcn_la-sysdep.lo] Error
1
make[4]: *** Waiting for unfinished jobs....
:


AFAICS it must be related to the cset from comment #12 as mercurial's file log
shows this is the first change to this part of sysdep.cc's code since > 2
months and previous builds all went fine.

I suppose this function is only used on Windows. I got that same Octave-10.0.0
compiled & running fine on Fedora 39.



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