--extern
Options
- Tracking issue for
--extern
crate modifiers: #98405 - Tracking issue for
noprelude
: #98398 - Tracking issue for
priv
: #98399 - Tracking issue for
nounused
: #98400
The behavior of the --extern
flag can be modified with noprelude
, priv
or nounused
options.
This is unstable feature, so you have to provide -Zunstable-options
to enable it.
Examples
Use your own build of the core
crate.
rustc main.rs -Z unstable-options --extern noprelude:core=libcore.rlib
To use multiple options, separate them with a comma:
rustc main.rs -Z unstable-options --extern noprelude,priv,nounused:mydep=mydep.rlib
Options
noprelude
: Do not add the crate to the external prelude. If used, it will need to be imported usingextern crate
. This is used by the build-std project to simulate compatibility with sysroot-only crates.priv
: Mark the crate as a private dependency for theexported_private_dependencies
lint.nounused
: Suppressunused-crate-dependencies
warnings for the crate.