Whether or not the Sun is in your composition, everything in the area that is illuminated by it should have the same exposure. Obviously the sun is brighter than anything it illuminates, so if you put the sun in your composition, it will be the brightest thing in the shot, plain and simple. The only thing it would change about exposure would be tweaks you'd make to combat the effects of flare.
So, the answer, as always, is "it depends". We's have to know what your individual composition is, and what you want it to look like to answer.
So, what you are really asking, if it must be generalized, is how not to let your meter get fooled by the sun being in your composition, not how to meter. The only type of meter that would be fooled by this situation would be a meter that decides its exposure based solely on how it reads the composition. The only meters that do this is are in-camera reflected meters, so of the methods you listed, they are the only problem child in this situation (as they are in most situations). An in-camera reflected meter is useless in this situation, unless you just want a picture of the sun on a black field. If that is all you have, meter without the Sun in the composition, set the exposure, and then recompose and shoot the shot you originally wanted.
With an incident meter, it's the same as any other time you use an incident meter: Point the dome of your incident meter directly at the light source that is illuminating your subject, and it will give you an exposure that will make things fall into place as accurately as they can at the given EI, favoring the midtones. Where you point the dome depends on what is illuminating the main subject.
Same with a spot meter: You can just use it however you normally would, but don't expect to be able to get a reading off of the sun itself during daylight hours.
With either of these methods, once you have this baseline exposure, if you know your films, you can use film selection, exposure tweaks, and processing tweaks to choose a characteristic curve that would best capture the luminance range at the scene in the desired way...as you can in any other situation.
So, IMO:
- Use incident meter as you normally would: Point at the light source, and tweak exposure and development depending on the characteristic curve you would like to use to capture the luminance range of your composition.
- Use spot meter as you normally would. You are going to have to make decisions as to where to place tones. Make sure to really visualize what you want. (Both of these things are a given with a spot meter in any situation).
- If you have to use an in-camera reflected meter, then meter as if the sun was not in the shot, then recompose.
The idea that an incident meter is worthless in this situation makes zero sense to me. IMO, it is the best choice.