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Implements
cargo/.config
build target and cfg access by using unstable cargo options:cargo config get
to read the target triple out of the config to pass tocargo metadata
--filter-platformcargo rustc --print
to read out therustc_cfgs
, this causes us to honorrustflags
and the like.If those commands fail, due to not having a nightly toolchain present for example, they will fall back to invoking rustc directly as we currently do.
I personally think it should be fine to use these unstable options as they are unlikely to change(even if they did it shouldn't be a problem due to the fallback) and don't burden the user if they do not have a nightly toolchain at hand since we fall back to the previous behaviour.
cc #8741
Closes #6604, Closes #5904, Closes #8430, Closes #8480