[SOLVED] How to get a release build with debugging information when using cargo?

How to get a release build with debugging information when using cargo?

The following command

$ cargo build

produces a non-optimized build with debugging information. On the contrary,

$ cargo build --release

produces an optimized build without debugging information.

Is there a way of producing an optimized build with debugging information? I need this to get meaningful profiling information.

Solution

As of Rust 1.57, Cargo now allows for custom profiles. This allows you to define your own profile that adds debug information:

[profile.release-with-debug]
inherits = "release"
debug = true

You can then use that profile when building:

% cargo build --profile=release-with-debug
   Compiling buggin v0.1.0 (/tmp/buggin)
    Finished release-with-debug [optimized + debuginfo] target(s) in 0.48s

Prior to this version, or if you always wanted to have debugging information, you can modify the release profile to include debugging symbols:

[profile.release]
debug = true

Note that the release profile and the bench profile differ.