Tracking issues for the `-Zmultitarget` feature

[alexcrichton]

This is intended to be a tracking issue for -Zmultitarget being implemented in #8167. This feature allows passing the --target flag multiple times to Cargo to build code simultaneously for multiple targets. This was originally requested in #8156 and #3913.

Currently the semantics of -Zmultitarget is that it simply allows passing --target multiple times (2 or more) to Cargo. Cargo recognizes this as doing what it was already doing, only now for multiple targets instead of just a single target. Internally Cargo's unit graph should still have all the edges drawn correctly and whatnot.

[4ad]

How is this supposed to interact with the (currently single) target specification in config.toml?

[alexcrichton]

I think we'd probably want to implement support for build.target = ["array", "of", "targets"]

[4ad]

SGTM.

[khionu]

Just saw that the referenced PR is closed. Are there any pending steps before closing this issue?