Configure features per target platform

[frol]

I am an early user of cargo-dist, and I love it!

It would be great to be able to configure features per target as some of the platforms do not support one thing or another. For example, I don't want to build udev-dependent code for linux-musl-static builds, so I would just disable default-features and enable only the features that make sense for musl-static build.

I wish cargo support it, and then cargo-dist may not need to implement it: rust-lang/cargo#1197

[quietvoid]

I'm facing a related issue with the plotters crate.

On Linux, it requires the fontconfig crate by default and offers a built in font with the ab_glyph feature.
In my project I distribute a Linux musl binary without support for system fonts, and build with flags like --no-default-features --features internal-font.

But I'd want to keep system fonts default for the other targets.
cargo-dist doesn't seem to let me do that.

[simonsan]

Same here, we have a command, that currently only works on Linux due to fuse dependency. So we have buried that behind the mount feature, but in general, we build with the release feature as a "default".

But we would like to set something like:

[dist]
features = ["release"]

[dist.additional-features]
x86_64-unknown-linux-gnu = ["mount"] 

So artifacts for x86_64-unknown-linux-gnu are build with -F release -F mount.