Module config

Entry point for the config module.

This module defines two macros:

• define_config!: A declarative macro used instead of #[derive(Deserialize)] to reduce compile time and binary size, especially for the bootstrap binary.

• check_ci_llvm!: A compile-time assertion macro that ensures certain settings are not enabled when download-ci-llvm is active.

A declarative macro is used here in place of a procedural derive macro to minimize the compile time of the bootstrap process.

Additionally, this module defines common types, enums, and helper functions used across various TOML configuration sections in bootstrap.toml.

It provides shared definitions for:

• Data types deserialized from TOML.
• Utility enums for specific configuration options.
• Helper functions for managing configuration values.

Re-exports

pub use target_selection::TargetSelection;

pub use toml::BUILDER_CONFIG_FILENAME;

pub use toml::change_id::ChangeId;

pub use toml::rust::LldMode;

pub use toml::target::Target;

pub use config::*;

Modules

config 🔒

This module defines the central Config struct, which aggregates all components of the bootstrap configuration into a single unit.

flags

Command-line interface of the bootstrap build system.

target_selection

toml

This module defines the structures that directly mirror the bootstrap.toml file’s format. These types are used for serde deserialization.

Enums

DebuginfoLevel

DryRun

GccCiMode

Determines how will GCC be provided.

LlvmLibunwind

ReplaceOpt

Describes how to handle conflicts in merging two TomlConfig

RustcLto

LTO mode used for compiling rustc itself.

SplitDebuginfo

StringOrBool

StringOrInt

Traits

Merge 🔒

Functions

set

threads_from_config