Support for building cargo examples

[madsmtm]

It would be nice if xbuild supported building cargo examples, so I could do e.g. x build --device=my_device --examples=my_example

[MarijnS95]

Been annoyed by lack of this as well, but never got around to it. PRs welcome!

[dvc94ch]

The problem is that I'd rather we don't have to reimplement cargo. Anyone know of the status of the cargo libraryfication that was a topic a few years back?

[MarijnS95]

Likely still nothing more than a topic? I haven't followed up on it, honestly.

[EriKWDev]

cargo doesn't currently support multiple lib targets. One can workaround this by using [[example]] for the time being rust-lang/cargo#8628 (comment)

My company has a very specific cargo setup for our game and engine which uses the [lib] inside our target for a sub-section of the game whereas the [[bin]]s are used for the actual game. x build seems to assume that the default lib is the one to build (it also ignores the name of the lib btw and assumes the lib and crate have the same name...).

Being able to instead supply a --example would make this work.

Re-implementing cargo is of course not what you should aim for, but similar to cargo flamegraph which supports examples I think a build tool should too.

This is a blocker for xbuild to be used atm