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Canon EF body + Canon FD lens

PARTIALLY COMPATIBLE MF MA

The flange focal depth should leave enough room for conversion, but...

When the Canon company abandoned the FD bayonet lock, probably intentionally the new system's flange focal depth was designed to be larger. By doing so, photographers couldn't use their excellent FD lenses on the new EF cameras (another valid reason is that the EF has a fully electronic, while the FD had a fully mechanic data transfer mechanism).

Two possible solutions are available though...

The first one is using a speedbooster adapter, where the extra lens alters the image size and focal points, but at the price of quality loss. read more here if you're interested). If you'd prefer this method, there are some adapters:

Another possible soultuion is replacing the bayonet lock. Since the difference in flange focal depth is a mere 2 mm, the original FD lock has to be removed and replaced by an EF bayonet lock. Neither AF or aperture control will be available, but at least the lens can be mounted on the camera. The main issuse is that the lens will suffer irreversible damage, its original state cannot be restored later. If you'd like to brave this, parts are over thre:

If you'd like to learn more about flange focal length and what does this have to do with incompatibility, this article might give you some insight.

The "Canon FD bayonet" may actually refer to three different things, and although these mean no difference in using the adapter, they're worth a mention. The FL bayonet was the predecessor of the FD and could have been fitted on cameras (and adapters) using the FD bayonet lock. The FD bayonet has two versions: FD and nFD. The original FD has a breech lock, which means that only the silver ring on its end of the housing moves when fixing it (it doesn't have a lug, it tightens onto the bayonet lock). In the case of the nFD the whole housing of the lens turns when fixing (similar to a modern EF lens), but the bayonet itself doesn't turn inside the compartment (and has a safety release as well). There are 134 types of FD and 33 types of FL lenses, all of which can be with all kinds of FD adapter rings.

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Terminology

In terms of compatibility, we distinguish four separate categories:

COMPATIBLE
PARTIALLY COMPATIBLE
COMPATIBLE IN THEORY
NOT COMPATIBLE
This means that you'll be able to apply the lens on the camera in question with a proper adapter, and full focus range will be available with it (often with aperture control too). If AF is supported, you'll see it in the description.
This means that due to the flange focal depth or other factor this conversion would be normally unfeasible, but with some compromises (e.g. using a speedbooster adapter) can be made possible.
This means that the flange focal depth should make mounting and using inifinty focus possible, but for some reason there are no adapter rings available or other factors make it unviable.
This means that you won't be able to mount your lens due to mechanical incompatibility or the difference in flange focal depth doesn't make inifinity focus possible. Although numerous lenses can be mounted on cameras without infinity focus, but this cannot be considered actual compatibility.

Additional information for compatible variations:

MF
AF
MA
AA
SB
MAC
TS
manual focus (on the lens, with its own control ring)
autofocus available (AF controlled by the camera body)
manual aperture control (on the lens, with its own control ring)
automatic aperture control (controlled by the camera body)
speedbooster (focal reducer) adapters are available
macro (variable length) adapters are available
tilt-shift (or other flexible) adapters can be used

If you'd like to read more in-depth about compatiblity, you'll need to get familiar with flange focal depth, see this article.