compiler/rustc_session/src/options.rs

   1 use crate::config::*;
   2
   3 use crate::early_error;
   4 use crate::lint;
   5 use crate::search_paths::SearchPath;
   6 use crate::utils::NativeLib;
   7 use rustc_target::spec::{CodeModel, LinkerFlavor, MergeFunctions, PanicStrategy, SanitizerSet};
   8 use rustc_target::spec::{
   9     RelocModel, RelroLevel, SplitDebuginfo, StackProtector, TargetTriple, TlsModel,
  10 };
  11
  12 use rustc_feature::UnstableFeatures;
  13 use rustc_span::edition::Edition;
  14 use rustc_span::RealFileName;
  15 use rustc_span::SourceFileHashAlgorithm;
  16
  17 use std::collections::BTreeMap;
  18
  19 use std::collections::hash_map::DefaultHasher;
  20 use std::hash::Hasher;
  21 use std::num::NonZeroUsize;
  22 use std::path::PathBuf;
  23 use std::str;
  24
  25 macro_rules! insert {
  26     ($opt_name:ident, $opt_expr:expr, $sub_hashes:expr) => {
  27         if $sub_hashes
  28             .insert(stringify!($opt_name), $opt_expr as &dyn dep_tracking::DepTrackingHash)
  29             .is_some()
  30         {
  31             panic!("duplicate key in CLI DepTrackingHash: {}", stringify!($opt_name))
  32         }
  33     };
  34 }
  35
  36 macro_rules! hash_opt {
  37     ($opt_name:ident, $opt_expr:expr, $sub_hashes:expr, $_for_crate_hash: ident, [UNTRACKED]) => {{}};
  38     ($opt_name:ident, $opt_expr:expr, $sub_hashes:expr, $_for_crate_hash: ident, [TRACKED]) => {{ insert!($opt_name, $opt_expr, $sub_hashes) }};
  39     ($opt_name:ident, $opt_expr:expr, $sub_hashes:expr, $for_crate_hash: ident, [TRACKED_NO_CRATE_HASH]) => {{
  40         if !$for_crate_hash {
  41             insert!($opt_name, $opt_expr, $sub_hashes)
  42         }
  43     }};
  44     ($opt_name:ident, $opt_expr:expr, $sub_hashes:expr, $_for_crate_hash: ident, [SUBSTRUCT]) => {{}};
  45 }
  46
  47 macro_rules! hash_substruct {
  48     ($opt_name:ident, $opt_expr:expr, $error_format:expr, $for_crate_hash:expr, $hasher:expr, [UNTRACKED]) => {{}};
  49     ($opt_name:ident, $opt_expr:expr, $error_format:expr, $for_crate_hash:expr, $hasher:expr, [TRACKED]) => {{}};
  50     ($opt_name:ident, $opt_expr:expr, $error_format:expr, $for_crate_hash:expr, $hasher:expr, [TRACKED_NO_CRATE_HASH]) => {{}};
  51     ($opt_name:ident, $opt_expr:expr, $error_format:expr, $for_crate_hash:expr, $hasher:expr, [SUBSTRUCT]) => {
  52         use crate::config::dep_tracking::DepTrackingHash;
  53         $opt_expr.dep_tracking_hash($for_crate_hash, $error_format).hash(
  54             $hasher,
  55             $error_format,
  56             $for_crate_hash,
  57         );
  58     };
  59 }
  60
  61 macro_rules! top_level_options {
  62     ( $( #[$top_level_attr:meta] )* pub struct Options { $(
  63         $( #[$attr:meta] )*
  64         $opt:ident : $t:ty [$dep_tracking_marker:ident],
  65     )* } ) => (
  66         #[derive(Clone)]
  67         $( #[$top_level_attr] )*
  68         pub struct Options {
  69             $(
  70                 $( #[$attr] )*
  71                 pub $opt: $t
  72             ),*
  73         }
  74
  75         impl Options {
  76             pub fn dep_tracking_hash(&self, for_crate_hash: bool) -> u64 {
  77                 let mut sub_hashes = BTreeMap::new();
  78                 $({
  79                     hash_opt!($opt,
  80                                 &self.$opt,
  81                                 &mut sub_hashes,
  82                                 for_crate_hash,
  83                                 [$dep_tracking_marker]);
  84                 })*
  85                 let mut hasher = DefaultHasher::new();
  86                 dep_tracking::stable_hash(sub_hashes,
  87                                           &mut hasher,
  88                                           self.error_format,
  89                                           for_crate_hash);
  90                 $({
  91                     hash_substruct!($opt,
  92                         &self.$opt,
  93                         self.error_format,
  94                         for_crate_hash,
  95                         &mut hasher,
  96                         [$dep_tracking_marker]);
  97                 })*
  98                 hasher.finish()
  99             }
 100         }
 101     );
 102 }
 103
 104 impl Options {
 105     pub fn mir_opt_level(&self) -> usize {
 106         self.debugging_opts
 107             .mir_opt_level
 108             .unwrap_or_else(|| if self.optimize != OptLevel::No { 2 } else { 1 })
 109     }
 110
 111     pub fn instrument_coverage(&self) -> bool {
 112         self.cg.instrument_coverage.unwrap_or(InstrumentCoverage::Off) != InstrumentCoverage::Off
 113     }
 114
 115     pub fn instrument_coverage_except_unused_generics(&self) -> bool {
 116         self.cg.instrument_coverage.unwrap_or(InstrumentCoverage::Off)
 117             == InstrumentCoverage::ExceptUnusedGenerics
 118     }
 119
 120     pub fn instrument_coverage_except_unused_functions(&self) -> bool {
 121         self.cg.instrument_coverage.unwrap_or(InstrumentCoverage::Off)
 122             == InstrumentCoverage::ExceptUnusedFunctions
 123     }
 124 }
 125
 126 top_level_options!(
 127     /// The top-level command-line options struct.
 128     ///
 129     /// For each option, one has to specify how it behaves with regard to the
 130     /// dependency tracking system of incremental compilation. This is done via the
 131     /// square-bracketed directive after the field type. The options are:
 132     ///
 133     /// - `[TRACKED]`
 134     /// A change in the given field will cause the compiler to completely clear the
 135     /// incremental compilation cache before proceeding.
 136     ///
 137     /// - `[TRACKED_NO_CRATE_HASH]`
 138     /// Same as `[TRACKED]`, but will not affect the crate hash. This is useful for options that only
 139     /// affect the incremental cache.
 140     ///
 141     /// - `[UNTRACKED]`
 142     /// Incremental compilation is not influenced by this option.
 143     ///
 144     /// - `[SUBSTRUCT]`
 145     /// Second-level sub-structs containing more options.
 146     ///
 147     /// If you add a new option to this struct or one of the sub-structs like
 148     /// `CodegenOptions`, think about how it influences incremental compilation. If in
 149     /// doubt, specify `[TRACKED]`, which is always "correct" but might lead to
 150     /// unnecessary re-compilation.
 151     pub struct Options {
 152         /// The crate config requested for the session, which may be combined
 153         /// with additional crate configurations during the compile process.
 154         crate_types: Vec<CrateType> [TRACKED],
 155         optimize: OptLevel [TRACKED],
 156         /// Include the `debug_assertions` flag in dependency tracking, since it
 157         /// can influence whether overflow checks are done or not.
 158         debug_assertions: bool [TRACKED],
 159         debuginfo: DebugInfo [TRACKED],
 160         lint_opts: Vec<(String, lint::Level)> [TRACKED_NO_CRATE_HASH],
 161         lint_cap: Option<lint::Level> [TRACKED_NO_CRATE_HASH],
 162         describe_lints: bool [UNTRACKED],
 163         output_types: OutputTypes [TRACKED],
 164         search_paths: Vec<SearchPath> [UNTRACKED],
 165         libs: Vec<NativeLib> [TRACKED],
 166         maybe_sysroot: Option<PathBuf> [UNTRACKED],
 167
 168         target_triple: TargetTriple [TRACKED],
 169
 170         test: bool [TRACKED],
 171         error_format: ErrorOutputType [UNTRACKED],
 172
 173         /// If `Some`, enable incremental compilation, using the given
 174         /// directory to store intermediate results.
 175         incremental: Option<PathBuf> [UNTRACKED],
 176         assert_incr_state: Option<IncrementalStateAssertion> [UNTRACKED],
 177
 178         debugging_opts: DebuggingOptions [SUBSTRUCT],
 179         prints: Vec<PrintRequest> [UNTRACKED],
 180         /// Determines which borrow checker(s) to run. This is the parsed, sanitized
 181         /// version of `debugging_opts.borrowck`, which is just a plain string.
 182         borrowck_mode: BorrowckMode [UNTRACKED],
 183         cg: CodegenOptions [SUBSTRUCT],
 184         externs: Externs [UNTRACKED],
 185         extern_dep_specs: ExternDepSpecs [UNTRACKED],
 186         crate_name: Option<String> [TRACKED],
 187         /// Indicates how the compiler should treat unstable features.
 188         unstable_features: UnstableFeatures [TRACKED],
 189
 190         /// Indicates whether this run of the compiler is actually rustdoc. This
 191         /// is currently just a hack and will be removed eventually, so please
 192         /// try to not rely on this too much.
 193         actually_rustdoc: bool [TRACKED],
 194
 195         /// Control path trimming.
 196         trimmed_def_paths: TrimmedDefPaths [TRACKED],
 197
 198         /// Specifications of codegen units / ThinLTO which are forced as a
 199         /// result of parsing command line options. These are not necessarily
 200         /// what rustc was invoked with, but massaged a bit to agree with
 201         /// commands like `--emit llvm-ir` which they're often incompatible with
 202         /// if we otherwise use the defaults of rustc.
 203         cli_forced_codegen_units: Option<usize> [UNTRACKED],
 204         cli_forced_thinlto_off: bool [UNTRACKED],
 205
 206         /// Remap source path prefixes in all output (messages, object files, debug, etc.).
 207         remap_path_prefix: Vec<(PathBuf, PathBuf)> [TRACKED_NO_CRATE_HASH],
 208         /// Base directory containing the `src/` for the Rust standard library, and
 209         /// potentially `rustc` as well, if we can can find it. Right now it's always
 210         /// `$sysroot/lib/rustlib/src/rust` (i.e. the `rustup` `rust-src` component).
 211         ///
 212         /// This directory is what the virtual `/rustc/$hash` is translated back to,
 213         /// if Rust was built with path remapping to `/rustc/$hash` enabled
 214         /// (the `rust.remap-debuginfo` option in `config.toml`).
 215         real_rust_source_base_dir: Option<PathBuf> [TRACKED_NO_CRATE_HASH],
 216
 217         edition: Edition [TRACKED],
 218
 219         /// `true` if we're emitting JSON blobs about each artifact produced
 220         /// by the compiler.
 221         json_artifact_notifications: bool [TRACKED],
 222
 223         /// `true` if we're emitting a JSON blob containing the unused externs
 224         json_unused_externs: bool [UNTRACKED],
 225
 226         /// `true` if we're emitting a JSON job containg a future-incompat report for lints
 227         json_future_incompat: bool [TRACKED],
 228
 229         pretty: Option<PpMode> [UNTRACKED],
 230
 231         /// The (potentially remapped) working directory
 232         working_dir: RealFileName [TRACKED],
 233     }
 234 );
 235
 236 /// Defines all `CodegenOptions`/`DebuggingOptions` fields and parsers all at once. The goal of this
 237 /// macro is to define an interface that can be programmatically used by the option parser
 238 /// to initialize the struct without hardcoding field names all over the place.
 239 ///
 240 /// The goal is to invoke this macro once with the correct fields, and then this macro generates all
 241 /// necessary code. The main gotcha of this macro is the `cgsetters` module which is a bunch of
 242 /// generated code to parse an option into its respective field in the struct. There are a few
 243 /// hand-written parsers for parsing specific types of values in this module.
 244 macro_rules! options {
 245     ($struct_name:ident, $stat:ident, $optmod:ident, $prefix:expr, $outputname:expr,
 246      $($( #[$attr:meta] )* $opt:ident : $t:ty = (
 247         $init:expr,
 248         $parse:ident,
 249         [$dep_tracking_marker:ident],
 250         $desc:expr)
 251      ),* ,) =>
 252 (
 253     #[derive(Clone)]
 254     pub struct $struct_name { $(pub $opt: $t),* }
 255
 256     impl Default for $struct_name {
 257         fn default() -> $struct_name {
 258             $struct_name { $( $( #[$attr] )* $opt: $init),* }
 259         }
 260     }
 261
 262     impl $struct_name {
 263         pub fn build(
 264             matches: &getopts::Matches,
 265             error_format: ErrorOutputType,
 266         ) -> $struct_name {
 267             build_options(matches, $stat, $prefix, $outputname, error_format)
 268         }
 269
 270         fn dep_tracking_hash(&self, for_crate_hash: bool, error_format: ErrorOutputType) -> u64 {
 271             let mut sub_hashes = BTreeMap::new();
 272             $({
 273                 hash_opt!($opt,
 274                             &self.$opt,
 275                             &mut sub_hashes,
 276                             for_crate_hash,
 277                             [$dep_tracking_marker]);
 278             })*
 279             let mut hasher = DefaultHasher::new();
 280             dep_tracking::stable_hash(sub_hashes,
 281                                         &mut hasher,
 282                                         error_format,
 283                                         for_crate_hash
 284                                         );
 285             hasher.finish()
 286         }
 287     }
 288
 289     pub const $stat: OptionDescrs<$struct_name> =
 290         &[ $( (stringify!($opt), $optmod::$opt, desc::$parse, $desc) ),* ];
 291
 292     mod $optmod {
 293     $(
 294         pub(super) fn $opt(cg: &mut super::$struct_name, v: Option<&str>) -> bool {
 295             super::parse::$parse(&mut redirect_field!(cg.$opt), v)
 296         }
 297     )*
 298     }
 299
 300 ) }
 301
 302 // Sometimes different options need to build a common structure.
 303 // That structure can be kept in one of the options' fields, the others become dummy.
 304 macro_rules! redirect_field {
 305     ($cg:ident.link_arg) => {
 306         $cg.link_args
 307     };
 308     ($cg:ident.pre_link_arg) => {
 309         $cg.pre_link_args
 310     };
 311     ($cg:ident.$field:ident) => {
 312         $cg.$field
 313     };
 314 }
 315
 316 type OptionSetter<O> = fn(&mut O, v: Option<&str>) -> bool;
 317 type OptionDescrs<O> = &'static [(&'static str, OptionSetter<O>, &'static str, &'static str)];
 318
 319 fn build_options<O: Default>(
 320     matches: &getopts::Matches,
 321     descrs: OptionDescrs<O>,
 322     prefix: &str,
 323     outputname: &str,
 324     error_format: ErrorOutputType,
 325 ) -> O {
 326     let mut op = O::default();
 327     for option in matches.opt_strs(prefix) {
 328         let (key, value) = match option.split_once('=') {
 329             None => (option, None),
 330             Some((k, v)) => (k.to_string(), Some(v)),
 331         };
 332
 333         let option_to_lookup = key.replace('-', "_");
 334         match descrs.iter().find(|(name, ..)| *name == option_to_lookup) {
 335             Some((_, setter, type_desc, _)) => {
 336                 if !setter(&mut op, value) {
 337                     match value {
 338                         None => early_error(
 339                             error_format,
 340                             &format!(
 341                                 "{0} option `{1}` requires {2} ({3} {1}=<value>)",
 342                                 outputname, key, type_desc, prefix
 343                             ),
 344                         ),
 345                         Some(value) => early_error(
 346                             error_format,
 347                             &format!(
 348                                 "incorrect value `{}` for {} option `{}` - {} was expected",
 349                                 value, outputname, key, type_desc
 350                             ),
 351                         ),
 352                     }
 353                 }
 354             }
 355             None => early_error(error_format, &format!("unknown {} option: `{}`", outputname, key)),
 356         }
 357     }
 358     return op;
 359 }
 360
 361 #[allow(non_upper_case_globals)]
 362 mod desc {
 363     pub const parse_no_flag: &str = "no value";
 364     pub const parse_bool: &str = "one of: `y`, `yes`, `on`, `n`, `no`, or `off`";
 365     pub const parse_opt_bool: &str = parse_bool;
 366     pub const parse_string: &str = "a string";
 367     pub const parse_opt_string: &str = parse_string;
 368     pub const parse_string_push: &str = parse_string;
 369     pub const parse_opt_pathbuf: &str = "a path";
 370     pub const parse_list: &str = "a space-separated list of strings";
 371     pub const parse_opt_comma_list: &str = "a comma-separated list of strings";
 372     pub const parse_number: &str = "a number";
 373     pub const parse_opt_number: &str = parse_number;
 374     pub const parse_threads: &str = parse_number;
 375     pub const parse_passes: &str = "a space-separated list of passes, or `all`";
 376     pub const parse_panic_strategy: &str = "either `unwind` or `abort`";
 377     pub const parse_opt_panic_strategy: &str = parse_panic_strategy;
 378     pub const parse_relro_level: &str = "one of: `full`, `partial`, or `off`";
 379     pub const parse_sanitizers: &str = "comma separated list of sanitizers: `address`, `cfi`, `hwaddress`, `leak`, `memory`, `memtag`, or `thread`";
 380     pub const parse_sanitizer_memory_track_origins: &str = "0, 1, or 2";
 381     pub const parse_cfguard: &str =
 382         "either a boolean (`yes`, `no`, `on`, `off`, etc), `checks`, or `nochecks`";
 383     pub const parse_cfprotection: &str = "`none`|`no`|`n` (default), `branch`, `return`, or `full`|`yes`|`y` (equivalent to `branch` and `return`)";
 384     pub const parse_strip: &str = "either `none`, `debuginfo`, or `symbols`";
 385     pub const parse_linker_flavor: &str = ::rustc_target::spec::LinkerFlavor::one_of();
 386     pub const parse_optimization_fuel: &str = "crate=integer";
 387     pub const parse_mir_spanview: &str = "`statement` (default), `terminator`, or `block`";
 388     pub const parse_instrument_coverage: &str =
 389         "`all` (default), `except-unused-generics`, `except-unused-functions`, or `off`";
 390     pub const parse_unpretty: &str = "`string` or `string=string`";
 391     pub const parse_treat_err_as_bug: &str = "either no value or a number bigger than 0";
 392     pub const parse_lto: &str =
 393         "either a boolean (`yes`, `no`, `on`, `off`, etc), `thin`, `fat`, or omitted";
 394     pub const parse_linker_plugin_lto: &str =
 395         "either a boolean (`yes`, `no`, `on`, `off`, etc), or the path to the linker plugin";
 396     pub const parse_location_detail: &str =
 397         "comma seperated list of location details to track: `file`, `line`, or `column`";
 398     pub const parse_switch_with_opt_path: &str =
 399         "an optional path to the profiling data output directory";
 400     pub const parse_merge_functions: &str = "one of: `disabled`, `trampolines`, or `aliases`";
 401     pub const parse_symbol_mangling_version: &str = "either `legacy` or `v0` (RFC 2603)";
 402     pub const parse_src_file_hash: &str = "either `md5` or `sha1`";
 403     pub const parse_relocation_model: &str =
 404         "one of supported relocation models (`rustc --print relocation-models`)";
 405     pub const parse_code_model: &str = "one of supported code models (`rustc --print code-models`)";
 406     pub const parse_tls_model: &str = "one of supported TLS models (`rustc --print tls-models`)";
 407     pub const parse_target_feature: &str = parse_string;
 408     pub const parse_wasi_exec_model: &str = "either `command` or `reactor`";
 409     pub const parse_split_debuginfo: &str =
 410         "one of supported split-debuginfo modes (`off`, `packed`, or `unpacked`)";
 411     pub const parse_split_dwarf_kind: &str =
 412         "one of supported split dwarf modes (`split` or `single`)";
 413     pub const parse_gcc_ld: &str = "one of: no value, `lld`";
 414     pub const parse_stack_protector: &str =
 415         "one of (`none` (default), `basic`, `strong`, or `all`)";
 416     pub const parse_branch_protection: &str =
 417         "a `,` separated combination of `bti`, `b-key`, `pac-ret`, or `leaf`";
 418 }
 419
 420 mod parse {
 421     crate use super::*;
 422     use std::str::FromStr;
 423
 424     /// This is for boolean options that don't take a value and start with
 425     /// `no-`. This style of option is deprecated.
 426     crate fn parse_no_flag(slot: &mut bool, v: Option<&str>) -> bool {
 427         match v {
 428             None => {
 429                 *slot = true;
 430                 true
 431             }
 432             Some(_) => false,
 433         }
 434     }
 435
 436     /// Use this for any boolean option that has a static default.
 437     crate fn parse_bool(slot: &mut bool, v: Option<&str>) -> bool {
 438         match v {
 439             Some("y") | Some("yes") | Some("on") | None => {
 440                 *slot = true;
 441                 true
 442             }
 443             Some("n") | Some("no") | Some("off") => {
 444                 *slot = false;
 445                 true
 446             }
 447             _ => false,
 448         }
 449     }
 450
 451     /// Use this for any boolean option that lacks a static default. (The
 452     /// actions taken when such an option is not specified will depend on
 453     /// other factors, such as other options, or target options.)
 454     crate fn parse_opt_bool(slot: &mut Option<bool>, v: Option<&str>) -> bool {
 455         match v {
 456             Some("y") | Some("yes") | Some("on") | None => {
 457                 *slot = Some(true);
 458                 true
 459             }
 460             Some("n") | Some("no") | Some("off") => {
 461                 *slot = Some(false);
 462                 true
 463             }
 464             _ => false,
 465         }
 466     }
 467
 468     /// Use this for any string option that has a static default.
 469     crate fn parse_string(slot: &mut String, v: Option<&str>) -> bool {
 470         match v {
 471             Some(s) => {
 472                 *slot = s.to_string();
 473                 true
 474             }
 475             None => false,
 476         }
 477     }
 478
 479     /// Use this for any string option that lacks a static default.
 480     crate fn parse_opt_string(slot: &mut Option<String>, v: Option<&str>) -> bool {
 481         match v {
 482             Some(s) => {
 483                 *slot = Some(s.to_string());
 484                 true
 485             }
 486             None => false,
 487         }
 488     }
 489
 490     crate fn parse_opt_pathbuf(slot: &mut Option<PathBuf>, v: Option<&str>) -> bool {
 491         match v {
 492             Some(s) => {
 493                 *slot = Some(PathBuf::from(s));
 494                 true
 495             }
 496             None => false,
 497         }
 498     }
 499
 500     crate fn parse_string_push(slot: &mut Vec<String>, v: Option<&str>) -> bool {
 501         match v {
 502             Some(s) => {
 503                 slot.push(s.to_string());
 504                 true
 505             }
 506             None => false,
 507         }
 508     }
 509
 510     crate fn parse_list(slot: &mut Vec<String>, v: Option<&str>) -> bool {
 511         match v {
 512             Some(s) => {
 513                 slot.extend(s.split_whitespace().map(|s| s.to_string()));
 514                 true
 515             }
 516             None => false,
 517         }
 518     }
 519
 520     crate fn parse_location_detail(ld: &mut LocationDetail, v: Option<&str>) -> bool {
 521         if let Some(v) = v {
 522             ld.line = false;
 523             ld.file = false;
 524             ld.column = false;
 525             for s in v.split(',') {
 526                 match s {
 527                     "file" => ld.file = true,
 528                     "line" => ld.line = true,
 529                     "column" => ld.column = true,
 530                     _ => return false,
 531                 }
 532             }
 533             true
 534         } else {
 535             false
 536         }
 537     }
 538
 539     crate fn parse_opt_comma_list(slot: &mut Option<Vec<String>>, v: Option<&str>) -> bool {
 540         match v {
 541             Some(s) => {
 542                 let mut v: Vec<_> = s.split(',').map(|s| s.to_string()).collect();
 543                 v.sort_unstable();
 544                 *slot = Some(v);
 545                 true
 546             }
 547             None => false,
 548         }
 549     }
 550
 551     crate fn parse_threads(slot: &mut usize, v: Option<&str>) -> bool {
 552         match v.and_then(|s| s.parse().ok()) {
 553             Some(0) => {
 554                 *slot = ::num_cpus::get();
 555                 true
 556             }
 557             Some(i) => {
 558                 *slot = i;
 559                 true
 560             }
 561             None => false,
 562         }
 563     }
 564
 565     /// Use this for any numeric option that has a static default.
 566     crate fn parse_number<T: Copy + FromStr>(slot: &mut T, v: Option<&str>) -> bool {
 567         match v.and_then(|s| s.parse().ok()) {
 568             Some(i) => {
 569                 *slot = i;
 570                 true
 571             }
 572             None => false,
 573         }
 574     }
 575
 576     /// Use this for any numeric option that lacks a static default.
 577     crate fn parse_opt_number<T: Copy + FromStr>(slot: &mut Option<T>, v: Option<&str>) -> bool {
 578         match v {
 579             Some(s) => {
 580                 *slot = s.parse().ok();
 581                 slot.is_some()
 582             }
 583             None => false,
 584         }
 585     }
 586
 587     crate fn parse_passes(slot: &mut Passes, v: Option<&str>) -> bool {
 588         match v {
 589             Some("all") => {
 590                 *slot = Passes::All;
 591                 true
 592             }
 593             v => {
 594                 let mut passes = vec![];
 595                 if parse_list(&mut passes, v) {
 596                     slot.extend(passes);
 597                     true
 598                 } else {
 599                     false
 600                 }
 601             }
 602         }
 603     }
 604
 605     crate fn parse_opt_panic_strategy(slot: &mut Option<PanicStrategy>, v: Option<&str>) -> bool {
 606         match v {
 607             Some("unwind") => *slot = Some(PanicStrategy::Unwind),
 608             Some("abort") => *slot = Some(PanicStrategy::Abort),
 609             _ => return false,
 610         }
 611         true
 612     }
 613
 614     crate fn parse_panic_strategy(slot: &mut PanicStrategy, v: Option<&str>) -> bool {
 615         match v {
 616             Some("unwind") => *slot = PanicStrategy::Unwind,
 617             Some("abort") => *slot = PanicStrategy::Abort,
 618             _ => return false,
 619         }
 620         true
 621     }
 622
 623     crate fn parse_relro_level(slot: &mut Option<RelroLevel>, v: Option<&str>) -> bool {
 624         match v {
 625             Some(s) => match s.parse::<RelroLevel>() {
 626                 Ok(level) => *slot = Some(level),
 627                 _ => return false,
 628             },
 629             _ => return false,
 630         }
 631         true
 632     }
 633
 634     crate fn parse_sanitizers(slot: &mut SanitizerSet, v: Option<&str>) -> bool {
 635         if let Some(v) = v {
 636             for s in v.split(',') {
 637                 *slot |= match s {
 638                     "address" => SanitizerSet::ADDRESS,
 639                     "cfi" => SanitizerSet::CFI,
 640                     "leak" => SanitizerSet::LEAK,
 641                     "memory" => SanitizerSet::MEMORY,
 642                     "memtag" => SanitizerSet::MEMTAG,
 643                     "thread" => SanitizerSet::THREAD,
 644                     "hwaddress" => SanitizerSet::HWADDRESS,
 645                     _ => return false,
 646                 }
 647             }
 648             true
 649         } else {
 650             false
 651         }
 652     }
 653
 654     crate fn parse_sanitizer_memory_track_origins(slot: &mut usize, v: Option<&str>) -> bool {
 655         match v {
 656             Some("2") | None => {
 657                 *slot = 2;
 658                 true
 659             }
 660             Some("1") => {
 661                 *slot = 1;
 662                 true
 663             }
 664             Some("0") => {
 665                 *slot = 0;
 666                 true
 667             }
 668             Some(_) => false,
 669         }
 670     }
 671
 672     crate fn parse_strip(slot: &mut Strip, v: Option<&str>) -> bool {
 673         match v {
 674             Some("none") => *slot = Strip::None,
 675             Some("debuginfo") => *slot = Strip::Debuginfo,
 676             Some("symbols") => *slot = Strip::Symbols,
 677             _ => return false,
 678         }
 679         true
 680     }
 681
 682     crate fn parse_cfguard(slot: &mut CFGuard, v: Option<&str>) -> bool {
 683         if v.is_some() {
 684             let mut bool_arg = None;
 685             if parse_opt_bool(&mut bool_arg, v) {
 686                 *slot = if bool_arg.unwrap() { CFGuard::Checks } else { CFGuard::Disabled };
 687                 return true;
 688             }
 689         }
 690
 691         *slot = match v {
 692             None => CFGuard::Checks,
 693             Some("checks") => CFGuard::Checks,
 694             Some("nochecks") => CFGuard::NoChecks,
 695             Some(_) => return false,
 696         };
 697         true
 698     }
 699
 700     crate fn parse_cfprotection(slot: &mut CFProtection, v: Option<&str>) -> bool {
 701         if v.is_some() {
 702             let mut bool_arg = None;
 703             if parse_opt_bool(&mut bool_arg, v) {
 704                 *slot = if bool_arg.unwrap() { CFProtection::Full } else { CFProtection::None };
 705                 return true;
 706             }
 707         }
 708
 709         *slot = match v {
 710             None | Some("none") => CFProtection::None,
 711             Some("branch") => CFProtection::Branch,
 712             Some("return") => CFProtection::Return,
 713             Some("full") => CFProtection::Full,
 714             Some(_) => return false,
 715         };
 716         true
 717     }
 718
 719     crate fn parse_linker_flavor(slot: &mut Option<LinkerFlavor>, v: Option<&str>) -> bool {
 720         match v.and_then(LinkerFlavor::from_str) {
 721             Some(lf) => *slot = Some(lf),
 722             _ => return false,
 723         }
 724         true
 725     }
 726
 727     crate fn parse_optimization_fuel(slot: &mut Option<(String, u64)>, v: Option<&str>) -> bool {
 728         match v {
 729             None => false,
 730             Some(s) => {
 731                 let parts = s.split('=').collect::<Vec<_>>();
 732                 if parts.len() != 2 {
 733                     return false;
 734                 }
 735                 let crate_name = parts[0].to_string();
 736                 let fuel = parts[1].parse::<u64>();
 737                 if fuel.is_err() {
 738                     return false;
 739                 }
 740                 *slot = Some((crate_name, fuel.unwrap()));
 741                 true
 742             }
 743         }
 744     }
 745
 746     crate fn parse_unpretty(slot: &mut Option<String>, v: Option<&str>) -> bool {
 747         match v {
 748             None => false,
 749             Some(s) if s.split('=').count() <= 2 => {
 750                 *slot = Some(s.to_string());
 751                 true
 752             }
 753             _ => false,
 754         }
 755     }
 756
 757     crate fn parse_mir_spanview(slot: &mut Option<MirSpanview>, v: Option<&str>) -> bool {
 758         if v.is_some() {
 759             let mut bool_arg = None;
 760             if parse_opt_bool(&mut bool_arg, v) {
 761                 *slot = if bool_arg.unwrap() { Some(MirSpanview::Statement) } else { None };
 762                 return true;
 763             }
 764         }
 765
 766         let v = match v {
 767             None => {
 768                 *slot = Some(MirSpanview::Statement);
 769                 return true;
 770             }
 771             Some(v) => v,
 772         };
 773
 774         *slot = Some(match v.trim_end_matches('s') {
 775             "statement" | "stmt" => MirSpanview::Statement,
 776             "terminator" | "term" => MirSpanview::Terminator,
 777             "block" | "basicblock" => MirSpanview::Block,
 778             _ => return false,
 779         });
 780         true
 781     }
 782
 783     crate fn parse_instrument_coverage(
 784         slot: &mut Option<InstrumentCoverage>,
 785         v: Option<&str>,
 786     ) -> bool {
 787         if v.is_some() {
 788             let mut bool_arg = None;
 789             if parse_opt_bool(&mut bool_arg, v) {
 790                 *slot = if bool_arg.unwrap() { Some(InstrumentCoverage::All) } else { None };
 791                 return true;
 792             }
 793         }
 794
 795         let v = match v {
 796             None => {
 797                 *slot = Some(InstrumentCoverage::All);
 798                 return true;
 799             }
 800             Some(v) => v,
 801         };
 802
 803         *slot = Some(match v {
 804             "all" => InstrumentCoverage::All,
 805             "except-unused-generics" | "except_unused_generics" => {
 806                 InstrumentCoverage::ExceptUnusedGenerics
 807             }
 808             "except-unused-functions" | "except_unused_functions" => {
 809                 InstrumentCoverage::ExceptUnusedFunctions
 810             }
 811             "off" | "no" | "n" | "false" | "0" => InstrumentCoverage::Off,
 812             _ => return false,
 813         });
 814         true
 815     }
 816
 817     crate fn parse_treat_err_as_bug(slot: &mut Option<NonZeroUsize>, v: Option<&str>) -> bool {
 818         match v {
 819             Some(s) => {
 820                 *slot = s.parse().ok();
 821                 slot.is_some()
 822             }
 823             None => {
 824                 *slot = NonZeroUsize::new(1);
 825                 true
 826             }
 827         }
 828     }
 829
 830     crate fn parse_lto(slot: &mut LtoCli, v: Option<&str>) -> bool {
 831         if v.is_some() {
 832             let mut bool_arg = None;
 833             if parse_opt_bool(&mut bool_arg, v) {
 834                 *slot = if bool_arg.unwrap() { LtoCli::Yes } else { LtoCli::No };
 835                 return true;
 836             }
 837         }
 838
 839         *slot = match v {
 840             None => LtoCli::NoParam,
 841             Some("thin") => LtoCli::Thin,
 842             Some("fat") => LtoCli::Fat,
 843             Some(_) => return false,
 844         };
 845         true
 846     }
 847
 848     crate fn parse_linker_plugin_lto(slot: &mut LinkerPluginLto, v: Option<&str>) -> bool {
 849         if v.is_some() {
 850             let mut bool_arg = None;
 851             if parse_opt_bool(&mut bool_arg, v) {
 852                 *slot = if bool_arg.unwrap() {
 853                     LinkerPluginLto::LinkerPluginAuto
 854                 } else {
 855                     LinkerPluginLto::Disabled
 856                 };
 857                 return true;
 858             }
 859         }
 860
 861         *slot = match v {
 862             None => LinkerPluginLto::LinkerPluginAuto,
 863             Some(path) => LinkerPluginLto::LinkerPlugin(PathBuf::from(path)),
 864         };
 865         true
 866     }
 867
 868     crate fn parse_switch_with_opt_path(slot: &mut SwitchWithOptPath, v: Option<&str>) -> bool {
 869         *slot = match v {
 870             None => SwitchWithOptPath::Enabled(None),
 871             Some(path) => SwitchWithOptPath::Enabled(Some(PathBuf::from(path))),
 872         };
 873         true
 874     }
 875
 876     crate fn parse_merge_functions(slot: &mut Option<MergeFunctions>, v: Option<&str>) -> bool {
 877         match v.and_then(|s| MergeFunctions::from_str(s).ok()) {
 878             Some(mergefunc) => *slot = Some(mergefunc),
 879             _ => return false,
 880         }
 881         true
 882     }
 883
 884     crate fn parse_relocation_model(slot: &mut Option<RelocModel>, v: Option<&str>) -> bool {
 885         match v.and_then(|s| RelocModel::from_str(s).ok()) {
 886             Some(relocation_model) => *slot = Some(relocation_model),
 887             None if v == Some("default") => *slot = None,
 888             _ => return false,
 889         }
 890         true
 891     }
 892
 893     crate fn parse_code_model(slot: &mut Option<CodeModel>, v: Option<&str>) -> bool {
 894         match v.and_then(|s| CodeModel::from_str(s).ok()) {
 895             Some(code_model) => *slot = Some(code_model),
 896             _ => return false,
 897         }
 898         true
 899     }
 900
 901     crate fn parse_tls_model(slot: &mut Option<TlsModel>, v: Option<&str>) -> bool {
 902         match v.and_then(|s| TlsModel::from_str(s).ok()) {
 903             Some(tls_model) => *slot = Some(tls_model),
 904             _ => return false,
 905         }
 906         true
 907     }
 908
 909     crate fn parse_symbol_mangling_version(
 910         slot: &mut Option<SymbolManglingVersion>,
 911         v: Option<&str>,
 912     ) -> bool {
 913         *slot = match v {
 914             Some("legacy") => Some(SymbolManglingVersion::Legacy),
 915             Some("v0") => Some(SymbolManglingVersion::V0),
 916             _ => return false,
 917         };
 918         true
 919     }
 920
 921     crate fn parse_src_file_hash(
 922         slot: &mut Option<SourceFileHashAlgorithm>,
 923         v: Option<&str>,
 924     ) -> bool {
 925         match v.and_then(|s| SourceFileHashAlgorithm::from_str(s).ok()) {
 926             Some(hash_kind) => *slot = Some(hash_kind),
 927             _ => return false,
 928         }
 929         true
 930     }
 931
 932     crate fn parse_target_feature(slot: &mut String, v: Option<&str>) -> bool {
 933         match v {
 934             Some(s) => {
 935                 if !slot.is_empty() {
 936                     slot.push(',');
 937                 }
 938                 slot.push_str(s);
 939                 true
 940             }
 941             None => false,
 942         }
 943     }
 944
 945     crate fn parse_wasi_exec_model(slot: &mut Option<WasiExecModel>, v: Option<&str>) -> bool {
 946         match v {
 947             Some("command") => *slot = Some(WasiExecModel::Command),
 948             Some("reactor") => *slot = Some(WasiExecModel::Reactor),
 949             _ => return false,
 950         }
 951         true
 952     }
 953
 954     crate fn parse_split_debuginfo(slot: &mut Option<SplitDebuginfo>, v: Option<&str>) -> bool {
 955         match v.and_then(|s| SplitDebuginfo::from_str(s).ok()) {
 956             Some(e) => *slot = Some(e),
 957             _ => return false,
 958         }
 959         true
 960     }
 961
 962     crate fn parse_split_dwarf_kind(slot: &mut SplitDwarfKind, v: Option<&str>) -> bool {
 963         match v.and_then(|s| SplitDwarfKind::from_str(s).ok()) {
 964             Some(e) => *slot = e,
 965             _ => return false,
 966         }
 967         true
 968     }
 969
 970     crate fn parse_gcc_ld(slot: &mut Option<LdImpl>, v: Option<&str>) -> bool {
 971         match v {
 972             None => *slot = None,
 973             Some("lld") => *slot = Some(LdImpl::Lld),
 974             _ => return false,
 975         }
 976         true
 977     }
 978
 979     crate fn parse_stack_protector(slot: &mut StackProtector, v: Option<&str>) -> bool {
 980         match v.and_then(|s| StackProtector::from_str(s).ok()) {
 981             Some(ssp) => *slot = ssp,
 982             _ => return false,
 983         }
 984         true
 985     }
 986
 987     crate fn parse_branch_protection(slot: &mut Option<BranchProtection>, v: Option<&str>) -> bool {
 988         match v {
 989             Some(s) => {
 990                 let slot = slot.get_or_insert_default();
 991                 for opt in s.split(',') {
 992                     match opt {
 993                         "bti" => slot.bti = true,
 994                         "pac-ret" if slot.pac_ret.is_none() => {
 995                             slot.pac_ret = Some(PacRet { leaf: false, key: PAuthKey::A })
 996                         }
 997                         "leaf" => match slot.pac_ret.as_mut() {
 998                             Some(pac) => pac.leaf = true,
 999                             _ => return false,
1000                         },
1001                         "b-key" => match slot.pac_ret.as_mut() {
1002                             Some(pac) => pac.key = PAuthKey::B,
1003                             _ => return false,
1004                         },
1005                         _ => return false,
1006                     };
1007                 }
1008             }
1009             _ => return false,
1010         }
1011         true
1012     }
1013 }
1014
1015 options! {
1016     CodegenOptions, CG_OPTIONS, cgopts, "C", "codegen",
1017
1018     // This list is in alphabetical order.
1019     //
1020     // If you add a new option, please update:
1021     // - compiler/rustc_interface/src/tests.rs
1022     // - src/doc/rustc/src/codegen-options/index.md
1023
1024     ar: String = (String::new(), parse_string, [UNTRACKED],
1025         "this option is deprecated and does nothing"),
1026     code_model: Option<CodeModel> = (None, parse_code_model, [TRACKED],
1027         "choose the code model to use (`rustc --print code-models` for details)"),
1028     codegen_units: Option<usize> = (None, parse_opt_number, [UNTRACKED],
1029         "divide crate into N units to optimize in parallel"),
1030     control_flow_guard: CFGuard = (CFGuard::Disabled, parse_cfguard, [TRACKED],
1031         "use Windows Control Flow Guard (default: no)"),
1032     debug_assertions: Option<bool> = (None, parse_opt_bool, [TRACKED],
1033         "explicitly enable the `cfg(debug_assertions)` directive"),
1034     debuginfo: usize = (0, parse_number, [TRACKED],
1035         "debug info emission level (0 = no debug info, 1 = line tables only, \
1036         2 = full debug info with variable and type information; default: 0)"),
1037     default_linker_libraries: bool = (false, parse_bool, [UNTRACKED],
1038         "allow the linker to link its default libraries (default: no)"),
1039     embed_bitcode: bool = (true, parse_bool, [TRACKED],
1040         "emit bitcode in rlibs (default: yes)"),
1041     extra_filename: String = (String::new(), parse_string, [UNTRACKED],
1042         "extra data to put in each output filename"),
1043     force_frame_pointers: Option<bool> = (None, parse_opt_bool, [TRACKED],
1044         "force use of the frame pointers"),
1045     force_unwind_tables: Option<bool> = (None, parse_opt_bool, [TRACKED],
1046         "force use of unwind tables"),
1047     incremental: Option<String> = (None, parse_opt_string, [UNTRACKED],
1048         "enable incremental compilation"),
1049     inline_threshold: Option<u32> = (None, parse_opt_number, [TRACKED],
1050         "set the threshold for inlining a function"),
1051     instrument_coverage: Option<InstrumentCoverage> = (None, parse_instrument_coverage, [TRACKED],
1052         "instrument the generated code to support LLVM source-based code coverage \
1053         reports (note, the compiler build config must include `profiler = true`); \
1054         implies `-C symbol-mangling-version=v0`. Optional values are:
1055         `=all` (implicit value)
1056         `=except-unused-generics`
1057         `=except-unused-functions`
1058         `=off` (default)"),
1059     link_arg: (/* redirected to link_args */) = ((), parse_string_push, [UNTRACKED],
1060         "a single extra argument to append to the linker invocation (can be used several times)"),
1061     link_args: Vec<String> = (Vec::new(), parse_list, [UNTRACKED],
1062         "extra arguments to append to the linker invocation (space separated)"),
1063     link_dead_code: Option<bool> = (None, parse_opt_bool, [TRACKED],
1064         "keep dead code at link time (useful for code coverage) (default: no)"),
1065     link_self_contained: Option<bool> = (None, parse_opt_bool, [UNTRACKED],
1066         "control whether to link Rust provided C objects/libraries or rely
1067         on C toolchain installed in the system"),
1068     linker: Option<PathBuf> = (None, parse_opt_pathbuf, [UNTRACKED],
1069         "system linker to link outputs with"),
1070     linker_flavor: Option<LinkerFlavor> = (None, parse_linker_flavor, [UNTRACKED],
1071         "linker flavor"),
1072     linker_plugin_lto: LinkerPluginLto = (LinkerPluginLto::Disabled,
1073         parse_linker_plugin_lto, [TRACKED],
1074         "generate build artifacts that are compatible with linker-based LTO"),
1075     llvm_args: Vec<String> = (Vec::new(), parse_list, [TRACKED],
1076         "a list of arguments to pass to LLVM (space separated)"),
1077     lto: LtoCli = (LtoCli::Unspecified, parse_lto, [TRACKED],
1078         "perform LLVM link-time optimizations"),
1079     metadata: Vec<String> = (Vec::new(), parse_list, [TRACKED],
1080         "metadata to mangle symbol names with"),
1081     no_prepopulate_passes: bool = (false, parse_no_flag, [TRACKED],
1082         "give an empty list of passes to the pass manager"),
1083     no_redzone: Option<bool> = (None, parse_opt_bool, [TRACKED],
1084         "disable the use of the redzone"),
1085     no_stack_check: bool = (false, parse_no_flag, [UNTRACKED],
1086         "this option is deprecated and does nothing"),
1087     no_vectorize_loops: bool = (false, parse_no_flag, [TRACKED],
1088         "disable loop vectorization optimization passes"),
1089     no_vectorize_slp: bool = (false, parse_no_flag, [TRACKED],
1090         "disable LLVM's SLP vectorization pass"),
1091     opt_level: String = ("0".to_string(), parse_string, [TRACKED],
1092         "optimization level (0-3, s, or z; default: 0)"),
1093     overflow_checks: Option<bool> = (None, parse_opt_bool, [TRACKED],
1094         "use overflow checks for integer arithmetic"),
1095     panic: Option<PanicStrategy> = (None, parse_opt_panic_strategy, [TRACKED],
1096         "panic strategy to compile crate with"),
1097     passes: Vec<String> = (Vec::new(), parse_list, [TRACKED],
1098         "a list of extra LLVM passes to run (space separated)"),
1099     prefer_dynamic: bool = (false, parse_bool, [TRACKED],
1100         "prefer dynamic linking to static linking (default: no)"),
1101     profile_generate: SwitchWithOptPath = (SwitchWithOptPath::Disabled,
1102         parse_switch_with_opt_path, [TRACKED],
1103         "compile the program with profiling instrumentation"),
1104     profile_use: Option<PathBuf> = (None, parse_opt_pathbuf, [TRACKED],
1105         "use the given `.profdata` file for profile-guided optimization"),
1106     relocation_model: Option<RelocModel> = (None, parse_relocation_model, [TRACKED],
1107         "control generation of position-independent code (PIC) \
1108         (`rustc --print relocation-models` for details)"),
1109     remark: Passes = (Passes::Some(Vec::new()), parse_passes, [UNTRACKED],
1110         "print remarks for these optimization passes (space separated, or \"all\")"),
1111     rpath: bool = (false, parse_bool, [UNTRACKED],
1112         "set rpath values in libs/exes (default: no)"),
1113     save_temps: bool = (false, parse_bool, [UNTRACKED],
1114         "save all temporary output files during compilation (default: no)"),
1115     soft_float: bool = (false, parse_bool, [TRACKED],
1116         "use soft float ABI (*eabihf targets only) (default: no)"),
1117     split_debuginfo: Option<SplitDebuginfo> = (None, parse_split_debuginfo, [TRACKED],
1118         "how to handle split-debuginfo, a platform-specific option"),
1119     strip: Strip = (Strip::None, parse_strip, [UNTRACKED],
1120         "tell the linker which information to strip (`none` (default), `debuginfo` or `symbols`)"),
1121     symbol_mangling_version: Option<SymbolManglingVersion> = (None,
1122         parse_symbol_mangling_version, [TRACKED],
1123         "which mangling version to use for symbol names ('legacy' (default) or 'v0')"),
1124     target_cpu: Option<String> = (None, parse_opt_string, [TRACKED],
1125         "select target processor (`rustc --print target-cpus` for details)"),
1126     target_feature: String = (String::new(), parse_target_feature, [TRACKED],
1127         "target specific attributes. (`rustc --print target-features` for details). \
1128         This feature is unsafe."),
1129
1130     // This list is in alphabetical order.
1131     //
1132     // If you add a new option, please update:
1133     // - compiler/rustc_interface/src/tests.rs
1134     // - src/doc/rustc/src/codegen-options/index.md
1135 }
1136
1137 options! {
1138     DebuggingOptions, DB_OPTIONS, dbopts, "Z", "debugging",
1139
1140     // This list is in alphabetical order.
1141     //
1142     // If you add a new option, please update:
1143     // - compiler/rustc_interface/src/tests.rs
1144
1145     allow_features: Option<Vec<String>> = (None, parse_opt_comma_list, [TRACKED],
1146         "only allow the listed language features to be enabled in code (space separated)"),
1147     always_encode_mir: bool = (false, parse_bool, [TRACKED],
1148         "encode MIR of all functions into the crate metadata (default: no)"),
1149     assume_incomplete_release: bool = (false, parse_bool, [TRACKED],
1150         "make cfg(version) treat the current version as incomplete (default: no)"),
1151     asm_comments: bool = (false, parse_bool, [TRACKED],
1152         "generate comments into the assembly (may change behavior) (default: no)"),
1153     assert_incr_state: Option<String> = (None, parse_opt_string, [UNTRACKED],
1154         "assert that the incremental cache is in given state: \
1155          either `loaded` or `not-loaded`."),
1156     ast_json: bool = (false, parse_bool, [UNTRACKED],
1157         "print the AST as JSON and halt (default: no)"),
1158     ast_json_noexpand: bool = (false, parse_bool, [UNTRACKED],
1159         "print the pre-expansion AST as JSON and halt (default: no)"),
1160     binary_dep_depinfo: bool = (false, parse_bool, [TRACKED],
1161         "include artifacts (sysroot, crate dependencies) used during compilation in dep-info \
1162         (default: no)"),
1163     borrowck: String = ("migrate".to_string(), parse_string, [UNTRACKED],
1164         "select which borrowck is used (`mir` or `migrate`) (default: `migrate`)"),
1165     branch_protection: Option<BranchProtection> = (None, parse_branch_protection, [TRACKED],
1166         "set options for branch target identification and pointer authentication on AArch64"),
1167     cf_protection: CFProtection = (CFProtection::None, parse_cfprotection, [TRACKED],
1168         "instrument control-flow architecture protection"),
1169     cgu_partitioning_strategy: Option<String> = (None, parse_opt_string, [TRACKED],
1170         "the codegen unit partitioning strategy to use"),
1171     chalk: bool = (false, parse_bool, [TRACKED],
1172         "enable the experimental Chalk-based trait solving engine"),
1173     codegen_backend: Option<String> = (None, parse_opt_string, [TRACKED],
1174         "the backend to use"),
1175     combine_cgu: bool = (false, parse_bool, [TRACKED],
1176         "combine CGUs into a single one"),
1177     crate_attr: Vec<String> = (Vec::new(), parse_string_push, [TRACKED],
1178         "inject the given attribute in the crate"),
1179     debug_info_for_profiling: bool = (false, parse_bool, [TRACKED],
1180         "emit discriminators and other data necessary for AutoFDO"),
1181     debug_macros: bool = (false, parse_bool, [TRACKED],
1182         "emit line numbers debug info inside macros (default: no)"),
1183     deduplicate_diagnostics: bool = (true, parse_bool, [UNTRACKED],
1184         "deduplicate identical diagnostics (default: yes)"),
1185     dep_info_omit_d_target: bool = (false, parse_bool, [TRACKED],
1186         "in dep-info output, omit targets for tracking dependencies of the dep-info files \
1187         themselves (default: no)"),
1188     dep_tasks: bool = (false, parse_bool, [UNTRACKED],
1189         "print tasks that execute and the color their dep node gets (requires debug build) \
1190         (default: no)"),
1191     dlltool: Option<PathBuf> = (None, parse_opt_pathbuf, [UNTRACKED],
1192         "import library generation tool (windows-gnu only)"),
1193     dont_buffer_diagnostics: bool = (false, parse_bool, [UNTRACKED],
1194         "emit diagnostics rather than buffering (breaks NLL error downgrading, sorting) \
1195         (default: no)"),
1196     drop_tracking: bool = (false, parse_bool, [TRACKED],
1197         "enables drop tracking in generators (default: no)"),
1198     dual_proc_macros: bool = (false, parse_bool, [TRACKED],
1199         "load proc macros for both target and host, but only link to the target (default: no)"),
1200     dump_dep_graph: bool = (false, parse_bool, [UNTRACKED],
1201         "dump the dependency graph to $RUST_DEP_GRAPH (default: /tmp/dep_graph.gv) \
1202         (default: no)"),
1203     dump_mir: Option<String> = (None, parse_opt_string, [UNTRACKED],
1204         "dump MIR state to file.
1205         `val` is used to select which passes and functions to dump. For example:
1206         `all` matches all passes and functions,
1207         `foo` matches all passes for functions whose name contains 'foo',
1208         `foo & ConstProp` only the 'ConstProp' pass for function names containing 'foo',
1209         `foo | bar` all passes for function names containing 'foo' or 'bar'."),
1210     dump_mir_dataflow: bool = (false, parse_bool, [UNTRACKED],
1211         "in addition to `.mir` files, create graphviz `.dot` files with dataflow results \
1212         (default: no)"),
1213     dump_mir_dir: String = ("mir_dump".to_string(), parse_string, [UNTRACKED],
1214         "the directory the MIR is dumped into (default: `mir_dump`)"),
1215     dump_mir_exclude_pass_number: bool = (false, parse_bool, [UNTRACKED],
1216         "exclude the pass number when dumping MIR (used in tests) (default: no)"),
1217     dump_mir_graphviz: bool = (false, parse_bool, [UNTRACKED],
1218         "in addition to `.mir` files, create graphviz `.dot` files (and with \
1219         `-Z instrument-coverage`, also create a `.dot` file for the MIR-derived \
1220         coverage graph) (default: no)"),
1221     dump_mir_spanview: Option<MirSpanview> = (None, parse_mir_spanview, [UNTRACKED],
1222         "in addition to `.mir` files, create `.html` files to view spans for \
1223         all `statement`s (including terminators), only `terminator` spans, or \
1224         computed `block` spans (one span encompassing a block's terminator and \
1225         all statements). If `-Z instrument-coverage` is also enabled, create \
1226         an additional `.html` file showing the computed coverage spans."),
1227     emit_stack_sizes: bool = (false, parse_bool, [UNTRACKED],
1228         "emit a section containing stack size metadata (default: no)"),
1229     fewer_names: Option<bool> = (None, parse_opt_bool, [TRACKED],
1230         "reduce memory use by retaining fewer names within compilation artifacts (LLVM-IR) \
1231         (default: no)"),
1232     force_unstable_if_unmarked: bool = (false, parse_bool, [TRACKED],
1233         "force all crates to be `rustc_private` unstable (default: no)"),
1234     fuel: Option<(String, u64)> = (None, parse_optimization_fuel, [TRACKED],
1235         "set the optimization fuel quota for a crate"),
1236     function_sections: Option<bool> = (None, parse_opt_bool, [TRACKED],
1237         "whether each function should go in its own section"),
1238     future_incompat_test: bool = (false, parse_bool, [UNTRACKED],
1239         "forces all lints to be future incompatible, used for internal testing (default: no)"),
1240     gcc_ld: Option<LdImpl> = (None, parse_gcc_ld, [TRACKED], "implementation of ld used by cc"),
1241     graphviz_dark_mode: bool = (false, parse_bool, [UNTRACKED],
1242         "use dark-themed colors in graphviz output (default: no)"),
1243     graphviz_font: String = ("Courier, monospace".to_string(), parse_string, [UNTRACKED],
1244         "use the given `fontname` in graphviz output; can be overridden by setting \
1245         environment variable `RUSTC_GRAPHVIZ_FONT` (default: `Courier, monospace`)"),
1246     hir_stats: bool = (false, parse_bool, [UNTRACKED],
1247         "print some statistics about AST and HIR (default: no)"),
1248     human_readable_cgu_names: bool = (false, parse_bool, [TRACKED],
1249         "generate human-readable, predictable names for codegen units (default: no)"),
1250     identify_regions: bool = (false, parse_bool, [UNTRACKED],
1251         "display unnamed regions as `'<id>`, using a non-ident unique id (default: no)"),
1252     incremental_ignore_spans: bool = (false, parse_bool, [UNTRACKED],
1253         "ignore spans during ICH computation -- used for testing (default: no)"),
1254     incremental_info: bool = (false, parse_bool, [UNTRACKED],
1255         "print high-level information about incremental reuse (or the lack thereof) \
1256         (default: no)"),
1257     incremental_relative_spans: bool = (false, parse_bool, [TRACKED],
1258         "hash spans relative to their parent item for incr. comp. (default: no)"),
1259     incremental_verify_ich: bool = (false, parse_bool, [UNTRACKED],
1260         "verify incr. comp. hashes of green query instances (default: no)"),
1261     inline_mir: Option<bool> = (None, parse_opt_bool, [TRACKED],
1262         "enable MIR inlining (default: no)"),
1263     inline_mir_threshold: Option<usize> = (None, parse_opt_number, [TRACKED],
1264         "a default MIR inlining threshold (default: 50)"),
1265     inline_mir_hint_threshold: Option<usize> = (None, parse_opt_number, [TRACKED],
1266         "inlining threshold for functions with inline hint (default: 100)"),
1267     inline_in_all_cgus: Option<bool> = (None, parse_opt_bool, [TRACKED],
1268         "control whether `#[inline]` functions are in all CGUs"),
1269     input_stats: bool = (false, parse_bool, [UNTRACKED],
1270         "gather statistics about the input (default: no)"),
1271     instrument_coverage: Option<InstrumentCoverage> = (None, parse_instrument_coverage, [TRACKED],
1272         "instrument the generated code to support LLVM source-based code coverage \
1273         reports (note, the compiler build config must include `profiler = true`); \
1274         implies `-C symbol-mangling-version=v0`. Optional values are:
1275         `=all` (implicit value)
1276         `=except-unused-generics`
1277         `=except-unused-functions`
1278         `=off` (default)"),
1279     instrument_mcount: bool = (false, parse_bool, [TRACKED],
1280         "insert function instrument code for mcount-based tracing (default: no)"),
1281     keep_hygiene_data: bool = (false, parse_bool, [UNTRACKED],
1282         "keep hygiene data after analysis (default: no)"),
1283     link_native_libraries: bool = (true, parse_bool, [UNTRACKED],
1284         "link native libraries in the linker invocation (default: yes)"),
1285     link_only: bool = (false, parse_bool, [TRACKED],
1286         "link the `.rlink` file generated by `-Z no-link` (default: no)"),
1287     llvm_plugins: Vec<String> = (Vec::new(), parse_list, [TRACKED],
1288         "a list LLVM plugins to enable (space separated)"),
1289     llvm_time_trace: bool = (false, parse_bool, [UNTRACKED],
1290         "generate JSON tracing data file from LLVM data (default: no)"),
1291     location_detail: LocationDetail = (LocationDetail::all(), parse_location_detail, [TRACKED],
1292         "comma seperated list of location details to be tracked when using caller_location \
1293         valid options are `file`, `line`, and `column` (default: all)"),
1294     ls: bool = (false, parse_bool, [UNTRACKED],
1295         "list the symbols defined by a library crate (default: no)"),
1296     macro_backtrace: bool = (false, parse_bool, [UNTRACKED],
1297         "show macro backtraces (default: no)"),
1298     merge_functions: Option<MergeFunctions> = (None, parse_merge_functions, [TRACKED],
1299         "control the operation of the MergeFunctions LLVM pass, taking \
1300         the same values as the target option of the same name"),
1301     meta_stats: bool = (false, parse_bool, [UNTRACKED],
1302         "gather metadata statistics (default: no)"),
1303     mir_emit_retag: bool = (false, parse_bool, [TRACKED],
1304         "emit Retagging MIR statements, interpreted e.g., by miri; implies -Zmir-opt-level=0 \
1305         (default: no)"),
1306     mir_opt_level: Option<usize> = (None, parse_opt_number, [TRACKED],
1307         "MIR optimization level (0-4; default: 1 in non optimized builds and 2 in optimized builds)"),
1308     move_size_limit: Option<usize> = (None, parse_opt_number, [TRACKED],
1309         "the size at which the `large_assignments` lint starts to be emitted"),
1310     mutable_noalias: Option<bool> = (None, parse_opt_bool, [TRACKED],
1311         "emit noalias metadata for mutable references (default: yes)"),
1312     new_llvm_pass_manager: Option<bool> = (None, parse_opt_bool, [TRACKED],
1313         "use new LLVM pass manager (default: no)"),
1314     nll_facts: bool = (false, parse_bool, [UNTRACKED],
1315         "dump facts from NLL analysis into side files (default: no)"),
1316     nll_facts_dir: String = ("nll-facts".to_string(), parse_string, [UNTRACKED],
1317         "the directory the NLL facts are dumped into (default: `nll-facts`)"),
1318     no_analysis: bool = (false, parse_no_flag, [UNTRACKED],
1319         "parse and expand the source, but run no analysis"),
1320     no_codegen: bool = (false, parse_no_flag, [TRACKED_NO_CRATE_HASH],
1321         "run all passes except codegen; no output"),
1322     no_generate_arange_section: bool = (false, parse_no_flag, [TRACKED],
1323         "omit DWARF address ranges that give faster lookups"),
1324     no_interleave_lints: bool = (false, parse_no_flag, [UNTRACKED],
1325         "execute lints separately; allows benchmarking individual lints"),
1326     no_leak_check: bool = (false, parse_no_flag, [UNTRACKED],
1327         "disable the 'leak check' for subtyping; unsound, but useful for tests"),
1328     no_link: bool = (false, parse_no_flag, [TRACKED],
1329         "compile without linking"),
1330     no_parallel_llvm: bool = (false, parse_no_flag, [UNTRACKED],
1331         "run LLVM in non-parallel mode (while keeping codegen-units and ThinLTO)"),
1332     no_unique_section_names: bool = (false, parse_bool, [TRACKED],
1333         "do not use unique names for text and data sections when -Z function-sections is used"),
1334     no_profiler_runtime: bool = (false, parse_no_flag, [TRACKED],
1335         "prevent automatic injection of the profiler_builtins crate"),
1336     normalize_docs: bool = (false, parse_bool, [TRACKED],
1337         "normalize associated items in rustdoc when generating documentation"),
1338     osx_rpath_install_name: bool = (false, parse_bool, [TRACKED],
1339         "pass `-install_name @rpath/...` to the macOS linker (default: no)"),
1340     panic_abort_tests: bool = (false, parse_bool, [TRACKED],
1341         "support compiling tests with panic=abort (default: no)"),
1342     panic_in_drop: PanicStrategy = (PanicStrategy::Unwind, parse_panic_strategy, [TRACKED],
1343         "panic strategy for panics in drops"),
1344     parse_only: bool = (false, parse_bool, [UNTRACKED],
1345         "parse only; do not compile, assemble, or link (default: no)"),
1346     partially_uninit_const_threshold: Option<usize> = (None, parse_opt_number, [TRACKED],
1347         "allow generating const initializers with mixed init/uninit bytes, \
1348         and set the maximum total size of a const allocation for which this is allowed (default: never)"),
1349     perf_stats: bool = (false, parse_bool, [UNTRACKED],
1350         "print some performance-related statistics (default: no)"),
1351     pick_stable_methods_before_any_unstable: bool = (true, parse_bool, [TRACKED],
1352         "try to pick stable methods first before picking any unstable methods (default: yes)"),
1353     plt: Option<bool> = (None, parse_opt_bool, [TRACKED],
1354         "whether to use the PLT when calling into shared libraries;
1355         only has effect for PIC code on systems with ELF binaries
1356         (default: PLT is disabled if full relro is enabled)"),
1357     polonius: bool = (false, parse_bool, [TRACKED],
1358         "enable polonius-based borrow-checker (default: no)"),
1359     polymorphize: bool = (false, parse_bool, [TRACKED],
1360           "perform polymorphization analysis"),
1361     pre_link_arg: (/* redirected to pre_link_args */) = ((), parse_string_push, [UNTRACKED],
1362         "a single extra argument to prepend the linker invocation (can be used several times)"),
1363     pre_link_args: Vec<String> = (Vec::new(), parse_list, [UNTRACKED],
1364         "extra arguments to prepend to the linker invocation (space separated)"),
1365     precise_enum_drop_elaboration: bool = (true, parse_bool, [TRACKED],
1366         "use a more precise version of drop elaboration for matches on enums (default: yes). \
1367         This results in better codegen, but has caused miscompilations on some tier 2 platforms. \
1368         See #77382 and #74551."),
1369     print_fuel: Option<String> = (None, parse_opt_string, [TRACKED],
1370         "make rustc print the total optimization fuel used by a crate"),
1371     print_llvm_passes: bool = (false, parse_bool, [UNTRACKED],
1372         "print the LLVM optimization passes being run (default: no)"),
1373     print_mono_items: Option<String> = (None, parse_opt_string, [UNTRACKED],
1374         "print the result of the monomorphization collection pass"),
1375     print_type_sizes: bool = (false, parse_bool, [UNTRACKED],
1376         "print layout information for each type encountered (default: no)"),
1377     proc_macro_backtrace: bool = (false, parse_bool, [UNTRACKED],
1378          "show backtraces for panics during proc-macro execution (default: no)"),
1379     profile: bool = (false, parse_bool, [TRACKED],
1380         "insert profiling code (default: no)"),
1381     profile_closures: bool = (false, parse_no_flag, [UNTRACKED],
1382         "profile size of closures"),
1383     profile_emit: Option<PathBuf> = (None, parse_opt_pathbuf, [TRACKED],
1384         "file path to emit profiling data at runtime when using 'profile' \
1385         (default based on relative source path)"),
1386     profiler_runtime: String = (String::from("profiler_builtins"), parse_string, [TRACKED],
1387         "name of the profiler runtime crate to automatically inject (default: `profiler_builtins`)"),
1388     profile_sample_use: Option<PathBuf> = (None, parse_opt_pathbuf, [TRACKED],
1389         "use the given `.prof` file for sampled profile-guided optimization (also known as AutoFDO)"),
1390     query_dep_graph: bool = (false, parse_bool, [UNTRACKED],
1391         "enable queries of the dependency graph for regression testing (default: no)"),
1392     randomize_layout: bool = (false, parse_bool, [TRACKED],
1393         "randomize the layout of types (default: no)"),
1394     layout_seed: Option<u64> = (None, parse_opt_number, [TRACKED],
1395         "seed layout randomization"),
1396     relax_elf_relocations: Option<bool> = (None, parse_opt_bool, [TRACKED],
1397         "whether ELF relocations can be relaxed"),
1398     relro_level: Option<RelroLevel> = (None, parse_relro_level, [TRACKED],
1399         "choose which RELRO level to use"),
1400     remap_cwd_prefix: Option<PathBuf> = (None, parse_opt_pathbuf, [TRACKED],
1401         "remap paths under the current working directory to this path prefix"),
1402     simulate_remapped_rust_src_base: Option<PathBuf> = (None, parse_opt_pathbuf, [TRACKED],
1403         "simulate the effect of remap-debuginfo = true at bootstrapping by remapping path \
1404         to rust's source base directory. only meant for testing purposes"),
1405     report_delayed_bugs: bool = (false, parse_bool, [TRACKED],
1406         "immediately print bugs registered with `delay_span_bug` (default: no)"),
1407     sanitizer: SanitizerSet = (SanitizerSet::empty(), parse_sanitizers, [TRACKED],
1408         "use a sanitizer"),
1409     sanitizer_memory_track_origins: usize = (0, parse_sanitizer_memory_track_origins, [TRACKED],
1410         "enable origins tracking in MemorySanitizer"),
1411     sanitizer_recover: SanitizerSet = (SanitizerSet::empty(), parse_sanitizers, [TRACKED],
1412         "enable recovery for selected sanitizers"),
1413     saturating_float_casts: Option<bool> = (None, parse_opt_bool, [TRACKED],
1414         "make float->int casts UB-free: numbers outside the integer type's range are clipped to \
1415         the max/min integer respectively, and NaN is mapped to 0 (default: yes)"),
1416     save_analysis: bool = (false, parse_bool, [UNTRACKED],
1417         "write syntax and type analysis (in JSON format) information, in \
1418         addition to normal output (default: no)"),
1419     self_profile: SwitchWithOptPath = (SwitchWithOptPath::Disabled,
1420         parse_switch_with_opt_path, [UNTRACKED],
1421         "run the self profiler and output the raw event data"),
1422     /// keep this in sync with the event filter names in librustc_data_structures/profiling.rs
1423     self_profile_events: Option<Vec<String>> = (None, parse_opt_comma_list, [UNTRACKED],
1424         "specify the events recorded by the self profiler;
1425         for example: `-Z self-profile-events=default,query-keys`
1426         all options: none, all, default, generic-activity, query-provider, query-cache-hit
1427                      query-blocked, incr-cache-load, incr-result-hashing, query-keys, function-args, args, llvm, artifact-sizes"),
1428     share_generics: Option<bool> = (None, parse_opt_bool, [TRACKED],
1429         "make the current crate share its generic instantiations"),
1430     show_span: Option<String> = (None, parse_opt_string, [TRACKED],
1431         "show spans for compiler debugging (expr|pat|ty)"),
1432     span_debug: bool = (false, parse_bool, [UNTRACKED],
1433         "forward proc_macro::Span's `Debug` impl to `Span`"),
1434     /// o/w tests have closure@path
1435     span_free_formats: bool = (false, parse_bool, [UNTRACKED],
1436         "exclude spans when debug-printing compiler state (default: no)"),
1437     src_hash_algorithm: Option<SourceFileHashAlgorithm> = (None, parse_src_file_hash, [TRACKED],
1438         "hash algorithm of source files in debug info (`md5`, `sha1`, or `sha256`)"),
1439     stack_protector: StackProtector = (StackProtector::None, parse_stack_protector, [TRACKED],
1440         "control stack smash protection strategy (`rustc --print stack-protector-strategies` for details)"),
1441     strip: Strip = (Strip::None, parse_strip, [UNTRACKED],
1442         "tell the linker which information to strip (`none` (default), `debuginfo` or `symbols`)"),
1443     split_dwarf_kind: SplitDwarfKind = (SplitDwarfKind::Split, parse_split_dwarf_kind, [UNTRACKED],
1444         "split dwarf variant (only if -Csplit-debuginfo is enabled and on relevant platform)
1445         (default: `split`)
1446
1447         `split`: sections which do not require relocation are written into a DWARF object (`.dwo`)
1448                  file which is ignored by the linker
1449         `single`: sections which do not require relocation are written into object file but ignored
1450                   by the linker"),
1451     split_dwarf_inlining: bool = (true, parse_bool, [UNTRACKED],
1452         "provide minimal debug info in the object/executable to facilitate online \
1453          symbolication/stack traces in the absence of .dwo/.dwp files when using Split DWARF"),
1454     symbol_mangling_version: Option<SymbolManglingVersion> = (None,
1455         parse_symbol_mangling_version, [TRACKED],
1456         "which mangling version to use for symbol names ('legacy' (default) or 'v0')"),
1457     teach: bool = (false, parse_bool, [TRACKED],
1458         "show extended diagnostic help (default: no)"),
1459     temps_dir: Option<String> = (None, parse_opt_string, [UNTRACKED],
1460         "the directory the intermediate files are written to"),
1461     terminal_width: Option<usize> = (None, parse_opt_number, [UNTRACKED],
1462         "set the current terminal width"),
1463     tune_cpu: Option<String> = (None, parse_opt_string, [TRACKED],
1464         "select processor to schedule for (`rustc --print target-cpus` for details)"),
1465     thinlto: Option<bool> = (None, parse_opt_bool, [TRACKED],
1466         "enable ThinLTO when possible"),
1467     thir_unsafeck: bool = (false, parse_bool, [TRACKED],
1468         "use the THIR unsafety checker (default: no)"),
1469     /// We default to 1 here since we want to behave like
1470     /// a sequential compiler for now. This'll likely be adjusted
1471     /// in the future. Note that -Zthreads=0 is the way to get
1472     /// the num_cpus behavior.
1473     threads: usize = (1, parse_threads, [UNTRACKED],
1474         "use a thread pool with N threads"),
1475     time: bool = (false, parse_bool, [UNTRACKED],
1476         "measure time of rustc processes (default: no)"),
1477     time_llvm_passes: bool = (false, parse_bool, [UNTRACKED],
1478         "measure time of each LLVM pass (default: no)"),
1479     time_passes: bool = (false, parse_bool, [UNTRACKED],
1480         "measure time of each rustc pass (default: no)"),
1481     tls_model: Option<TlsModel> = (None, parse_tls_model, [TRACKED],
1482         "choose the TLS model to use (`rustc --print tls-models` for details)"),
1483     trace_macros: bool = (false, parse_bool, [UNTRACKED],
1484         "for every macro invocation, print its name and arguments (default: no)"),
1485     trap_unreachable: Option<bool> = (None, parse_opt_bool, [TRACKED],
1486         "generate trap instructions for unreachable intrinsics (default: use target setting, usually yes)"),
1487     treat_err_as_bug: Option<NonZeroUsize> = (None, parse_treat_err_as_bug, [TRACKED],
1488         "treat error number `val` that occurs as bug"),
1489     trim_diagnostic_paths: bool = (true, parse_bool, [UNTRACKED],
1490         "in diagnostics, use heuristics to shorten paths referring to items"),
1491     ui_testing: bool = (false, parse_bool, [UNTRACKED],
1492         "emit compiler diagnostics in a form suitable for UI testing (default: no)"),
1493     unleash_the_miri_inside_of_you: bool = (false, parse_bool, [TRACKED],
1494         "take the brakes off const evaluation. NOTE: this is unsound (default: no)"),
1495     unpretty: Option<String> = (None, parse_unpretty, [UNTRACKED],
1496         "present the input source, unstable (and less-pretty) variants;
1497         `normal`, `identified`,
1498         `expanded`, `expanded,identified`,
1499         `expanded,hygiene` (with internal representations),
1500         `everybody_loops` (all function bodies replaced with `loop {}`),
1501         `ast-tree` (raw AST before expansion),
1502         `ast-tree,expanded` (raw AST after expansion),
1503         `hir` (the HIR), `hir,identified`,
1504         `hir,typed` (HIR with types for each node),
1505         `hir-tree` (dump the raw HIR),
1506         `mir` (the MIR), or `mir-cfg` (graphviz formatted MIR)"),
1507     unsound_mir_opts: bool = (false, parse_bool, [TRACKED],
1508         "enable unsound and buggy MIR optimizations (default: no)"),
1509     unstable_options: bool = (false, parse_bool, [UNTRACKED],
1510         "adds unstable command line options to rustc interface (default: no)"),
1511     use_ctors_section: Option<bool> = (None, parse_opt_bool, [TRACKED],
1512         "use legacy .ctors section for initializers rather than .init_array"),
1513     validate_mir: bool = (false, parse_bool, [UNTRACKED],
1514         "validate MIR after each transformation"),
1515     verbose: bool = (false, parse_bool, [UNTRACKED],
1516         "in general, enable more debug printouts (default: no)"),
1517     verify_llvm_ir: bool = (false, parse_bool, [TRACKED],
1518         "verify LLVM IR (default: no)"),
1519     wasi_exec_model: Option<WasiExecModel> = (None, parse_wasi_exec_model, [TRACKED],
1520         "whether to build a wasi command or reactor"),
1521
1522     // This list is in alphabetical order.
1523     //
1524     // If you add a new option, please update:
1525     // - compiler/rustc_interface/src/tests.rs
1526 }
1527
1528 #[derive(Clone, Hash, PartialEq, Eq, Debug)]
1529 pub enum WasiExecModel {
1530     Command,
1531     Reactor,
1532 }
1533
1534 #[derive(Clone, Copy, Hash)]
1535 pub enum LdImpl {
1536     Lld,
1537 }