Module profiles Copy item path

Handles built-in and customizable compiler flag presets.

Profiles is a collections of built-in profiles, and profiles defined in the root manifest and configurations.

To start using a profile, most of the time you start from Profiles::new, which does the followings:

• Create a Profiles by merging profiles from configs onto the profile from root manifest (see [merge_config_profiles]).
• Add built-in profiles onto it (see Profiles::add_root_profiles).
• Process profile inheritance for each profiles. (see Profiles::add_maker).

Then you can query a Profile via Profiles::get_profile, which respects the profile overridden hierarchy described in below. The Profile you get is basically an immutable struct containing the compiler flag presets.

§Profile overridden hierarchy

Profile settings can be overridden for specific packages and build-time crates. The precedence is explained in [ProfileMaker]. The algorithm happens within [ProfileMaker::get_profile].