cargo rustc: "--profile" does not work with "--lib"

[RalfJung]

Problem

When I pass both --lib and --profile options to cargo rustc, compilation errors.

Steps

1. Clone hashbrown
2. "cargo" "rustc" "--lib" "hashbrown" "--profile" "test"

This errors saying

error: Unrecognized option: 'profile'

error: Could not compile `hashbrown`.

To learn more, run the command again with --verbose.

Seems like it passes the flag to rustc?

Changing the argument order changes the error:

2. "cargo" "rustc" --profile test "--lib" "hashbrown"

error: multiple input filenames provided

error: Could not compile `hashbrown`.

To learn more, run the command again with --verbose.

Notes

With --bin, everything works as expected. Just --lib is affected.

Output of cargo version: cargo 1.32.0 (8610973 2019-01-02)

[ehuss]

--lib does not take an argument. When you pass the arg hashbrown, clap decides everything after it belongs to the rustc arguments. This is a convenience which is maybe not always so convenient.

I think what you want is.

cargo rustc --lib --profile test

[RalfJung]

D'oh. Yes that works. Thanks!