feature option can't be set to auto when auto_features is set

[lazka]

meson.build:

project('foo', 'c', version : '1.16.0')
if get_option('opencv').auto()
  message('opencv: auto')
elif get_option('opencv').enabled()
  message('opencv: enabled')
else
  message('opencv: disabled')
endif

meson_options.txt:

option('opencv', type : 'feature', value : 'auto')

• Run: meson -Dauto_features=enabled -Dopencv=auto _build
• Expected: opencv is set to auto
• Actual: opencv is set to enabled

Context: I'm using auto_features=enabled for packaging and after that changing each option as needed. An error message would also work I guess, I wanted to use it this way to work around a bug in the gstreamer meson build.

[dcbaker]

That is the intended behavior, the idea is that packagers can use that option to ensure that there is no automagic going on behind their backs. We could (and maybe should) give a warning/error when auto_features is set and a features is explicitly set to auto.