Memory leak with octave cygwin DLD calls

[Andy Adler]

Hello,

I've been trying to debug a memory leak problem with
cyginw octave. It's been there since at least 2.1.60 and
is still in 2.9.2. I've now simplified it to this:

Using a simple DLD function like
    $ cat zno.cpp
    #include <octave/oct.h>

    DEFUN_DLD (zno, args, , " "  ) {
        octave_value retval= 0.0;
        return retval;
    }

call octave like this

    echo 'for i=1:1e8; x=zno ;end'  | octave -qfH

and watch the process monitor size for octave climb.
I calculate about 16 bytes leak per function call.

This also happens with builtin functions

    echo 'for i=1:1e8; x=sort(1) ;end'  | octave -qfH

If octave is compiled statically, there is no memory
leak.

I'm not sure where to look to debug this.
--
Andy Adler