lupdate redirects all output to standard error instead of only error output

The lupdate program redirects all output to standarderror(stderr) instead of only errors

eks ( 2>NUL redirects stderr to null )

lupdate -version gives "lupdate version 4.7.0"
lupdate -version 2>NUL gives no output, meaning version info is redirected to stderr
lrelease -version 2>NUL gives "lrelease version 4.7.0" meaing version info is sent to stdout

full example:
command: lupdate xmlfiles.pro

raw output:

C:/Qt/4.7.0/mkspecs/features/debug_and_release.prf(66):Function 'eval' is not implemented
Updating 'XmlFiles_da.ts'...
Found 1020 source text(s) (0 new and 1020 already existing)

output with standard output piped into null:

C:/Qt/4.7.0/mkspecs/features/debug_and_release.prf(66):Function 'eval' is not implemented
Updating 'XmlFiles_da.ts'...
Found 1020 source text(s) (0 new and 1020 already existing)

output with standard error piped into null:

(nothing!)

expected output when piping standard error to null:

Updating 'XmlFiles_da.ts'...
Found 1020 source text(s) (0 new and 1020 already existing)