Commits on Jul 17, 2020

1. Add a -Zbuild-std-features flag …

   This flag is intended to pair with `-Zbuild-std` as necessary to
   configure the features that libstd is built with. This is highly
   unlikely to ever be stabilized in any form (unlike `-Zbuild-std` which
   we'd like to stabilize at some point), but can be useful for
   experimenting with the standard library. For example today it can be
   used to test changes to binary size by disabling backtraces.
   
   My intention is that we won't need a `--no-default-features` equivalent
   for libstd, where after rust-lang/rust#74377 is merged we can
   unconditionally specify default features are disabled but the default
   set of features lists `default`. That way if users want to override the
   list *and* include the default feature, they can just be sure to include
   `default`.

   

   alexcrichton committed Jul 17, 2020
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