[bug #68006] 'system' command unable to redirect stderr or stdout to "nul"

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Update of bug #68006 (group octave):

                  Status:                    None => Confirmed

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Follow-up Comment #1:

I don't have a standalone Java installation on my computer. I'm trying to
reproduce with `gcc`. So, the behavior might be different.

It works for me with Octave 11.0.90:

octave:1> a = system('gcc -version')
gcc: error: unrecognized command-line option '-version'
gcc: fatal error: no input files
compilation terminated.
a = 1
octave:2> a = system('gcc -version 2> nul')
a = 1
octave:3>


It seems that I can reproduce with hg id da8fedf4ca57 (built natively using
MSYS2/MINGW64):

octave:1> a = system('gcc -version')

gcc: error: unrecognized command-line option '-version'
gcc: fatal error: no input files
compilation terminated.
a = 1
octave:2> a = system('gcc -version 2> nul')

gcc: error: unrecognized command-line option '-version'
a = 1


Interestingly, part of the output does disappear.

If I use the two-output form of `system`, the additional line disappears as
well:

octave:3> [a, b] = system('gcc -version 2> nul')

a = 1
b =
octave:4>


Re-directing stderr to stdout also behaves surprisingly. It works correctly in
the two-output form, but only redirects part of the output in the one output
argument form:

octave:7> [a, b] = system('gcc -version 2>&1')
a = 1
b = gcc: error: unrecognized command-line option '-version'
gcc: fatal error: no input files
compilation terminated.

octave:8> a = system('gcc -version 2>&1')
gcc: error: unrecognized command-line option '-version'
a = 1
octave:9>


Redirecting stderr to a file also only works in the two-output form.

I don't know which part of that worked before. But I'd guess that at least
part of this is a regression from hg id 96b2c2206e88.

I'll try to look into what is happening and how that could be resolved.



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