Struct Options

pub(crate) struct Options {

    pub crate_types: Vec<CrateType>,
    pub optimize: OptLevel,
    pub debug_assertions: bool,
    pub debuginfo: DebugInfo,
    pub debuginfo_compression: DebugInfoCompression,
    pub lint_opts: Vec<(String, Level)>,
    pub lint_cap: Option<Level>,
    pub describe_lints: bool,
    pub output_types: OutputTypes,
    pub search_paths: Vec<SearchPath>,
    pub libs: Vec<NativeLib>,
    pub maybe_sysroot: Option<PathBuf>,
    pub target_triple: TargetTuple,
    pub logical_env: IndexMap<String, String, BuildHasherDefault<FxHasher>>,
    pub test: bool,
    pub error_format: ErrorOutputType,
    pub diagnostic_width: Option<usize>,
    pub incremental: Option<PathBuf>,
    pub assert_incr_state: Option<IncrementalStateAssertion>,
    pub untracked_state_hash: Hash64,
    pub unstable_opts: UnstableOptions,
    pub prints: Vec<PrintRequest>,
    pub cg: CodegenOptions,
    pub externs: Externs,
    pub crate_name: Option<String>,
    pub unstable_features: UnstableFeatures,
    pub actually_rustdoc: bool,
    pub resolve_doc_links: ResolveDocLinks,
    pub trimmed_def_paths: bool,
    pub cli_forced_codegen_units: Option<usize>,
    pub cli_forced_local_thinlto_off: bool,
    pub remap_path_prefix: Vec<(PathBuf, PathBuf)>,
    pub real_rust_source_base_dir: Option<PathBuf>,
    pub edition: Edition,
    pub json_artifact_notifications: bool,
    pub json_unused_externs: JsonUnusedExterns,
    pub json_future_incompat: bool,
    pub pretty: Option<PpMode>,
    pub working_dir: RealFileName,
    pub color: ColorConfig,
    pub verbose: bool,
}

The top-level command-line options struct.

For each option, one has to specify how it behaves with regard to the dependency tracking system of incremental compilation. This is done via the square-bracketed directive after the field type. The options are:

• [TRACKED] A change in the given field will cause the compiler to completely clear the incremental compilation cache before proceeding.

• [TRACKED_NO_CRATE_HASH] Same as [TRACKED], but will not affect the crate hash. This is useful for options that only affect the incremental cache.

• [UNTRACKED] Incremental compilation is not influenced by this option.

• [SUBSTRUCT] Second-level sub-structs containing more options.

If you add a new option to this struct or one of the sub-structs like CodegenOptions, think about how it influences incremental compilation. If in doubt, specify [TRACKED], which is always “correct” but might lead to unnecessary re-compilation.

Fields

crate_types: Vec<CrateType>

The crate config requested for the session, which may be combined with additional crate configurations during the compile process.

optimize: OptLevel

debug_assertions: bool

Include the debug_assertions flag in dependency tracking, since it can influence whether overflow checks are done or not.

debuginfo: DebugInfo

debuginfo_compression: DebugInfoCompression

lint_opts: Vec<(String, Level)>

lint_cap: Option<Level>

describe_lints: bool

output_types: OutputTypes

search_paths: Vec<SearchPath>

libs: Vec<NativeLib>

maybe_sysroot: Option<PathBuf>

target_triple: TargetTuple

logical_env: IndexMap<String, String, BuildHasherDefault<FxHasher>>

Effective logical environment used by env!/option_env! macros

test: bool

error_format: ErrorOutputType

diagnostic_width: Option<usize>

incremental: Option<PathBuf>

If Some, enable incremental compilation, using the given directory to store intermediate results.

assert_incr_state: Option<IncrementalStateAssertion>

untracked_state_hash: Hash64

Set by the Config::hash_untracked_state callback for custom drivers to invalidate the incremental cache

unstable_opts: UnstableOptions

prints: Vec<PrintRequest>

cg: CodegenOptions

externs: Externs

crate_name: Option<String>

unstable_features: UnstableFeatures

Indicates how the compiler should treat unstable features.

actually_rustdoc: bool

Indicates whether this run of the compiler is actually rustdoc. This is currently just a hack and will be removed eventually, so please try to not rely on this too much.

resolve_doc_links: ResolveDocLinks

Whether name resolver should resolve documentation links.

trimmed_def_paths: bool

Control path trimming.

cli_forced_codegen_units: Option<usize>

Specifications of codegen units / ThinLTO which are forced as a result of parsing command line options. These are not necessarily what rustc was invoked with, but massaged a bit to agree with commands like --emit llvm-ir which they’re often incompatible with if we otherwise use the defaults of rustc.

cli_forced_local_thinlto_off: bool

remap_path_prefix: Vec<(PathBuf, PathBuf)>

Remap source path prefixes in all output (messages, object files, debug, etc.).

real_rust_source_base_dir: Option<PathBuf>

Base directory containing the src/ for the Rust standard library, and potentially rustc as well, if we can find it. Right now it’s always $sysroot/lib/rustlib/src/rust (i.e. the rustup rust-src component).

This directory is what the virtual /rustc/$hash is translated back to, if Rust was built with path remapping to /rustc/$hash enabled (the rust.remap-debuginfo option in config.toml).

edition: Edition

json_artifact_notifications: bool

true if we’re emitting JSON blobs about each artifact produced by the compiler.

json_unused_externs: JsonUnusedExterns

true if we’re emitting a JSON blob containing the unused externs

json_future_incompat: bool

true if we’re emitting a JSON job containing a future-incompat report for lints

pretty: Option<PpMode>

working_dir: RealFileName

The (potentially remapped) working directory

color: ColorConfig

verbose: bool

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 2200 bytes