cargo-rustc - Compile the current package, and pass extra options to the compiler
The specified target for the current package (or package specified by -p if
provided) will be compiled along with all of its dependencies. The specified
ARGS will all be passed to the final compiler invocation, not any of the
dependencies. Note that the compiler will still unconditionally receive
arguments such as -L, --extern, and --crate-type, and the specified
ARGS will simply be added to the compiler invocation.
See https://doc.rust-lang.org/rustc/index.html for documentation on rustc flags.
description-one-target.adoc
To pass flags to all compiler processes spawned by Cargo, use the RUSTFLAGS
environment variable or the build.rustflags
linkcargo:reference/config.html[config value].
When no target selection options are given, cargo rustc will build all
binary and library targets of the selected package.
-
Check if your package (not including dependencies) uses unsafe code:
cargo rustc --lib -- -D unsafe-code
-
Try an experimental flag on the nightly compiler, such as this which prints the size of every type:
cargo rustc --lib -- -Z print-type-sizes