1 //! [Flexible target specification.](https://github.com/rust-lang/rfcs/pull/131)
3 //! Rust targets a wide variety of usecases, and in the interest of flexibility,
4 //! allows new target triples to be defined in configuration files. Most users
5 //! will not need to care about these, but this is invaluable when porting Rust
6 //! to a new platform, and allows for an unprecedented level of control over how
7 //! the compiler works.
9 //! # Using custom targets
11 //! A target triple, as passed via `rustc --target=TRIPLE`, will first be
12 //! compared against the list of built-in targets. This is to ease distributing
13 //! rustc (no need for configuration files) and also to hold these built-in
14 //! targets as immutable and sacred. If `TRIPLE` is not one of the built-in
15 //! targets, rustc will check if a file named `TRIPLE` exists. If it does, it
16 //! will be loaded as the target configuration. If the file does not exist,
17 //! rustc will search each directory in the environment variable
18 //! `RUST_TARGET_PATH` for a file named `TRIPLE.json`. The first one found will
19 //! be loaded. If no file is found in any of those directories, a fatal error
22 //! Projects defining their own targets should use
23 //! `--target=path/to/my-awesome-platform.json` instead of adding to
24 //! `RUST_TARGET_PATH`.
26 //! # Defining a new target
28 //! Targets are defined using [JSON](https://json.org/). The `Target` struct in
29 //! this module defines the format the JSON file should take, though each
30 //! underscore in the field names should be replaced with a hyphen (`-`) in the
31 //! JSON file. Some fields are required in every target specification, such as
32 //! `llvm-target`, `target-endian`, `target-pointer-width`, `data-layout`,
33 //! `arch`, and `os`. In general, options passed to rustc with `-C` override
34 //! the target's settings, though `target-feature` and `link-args` will *add*
35 //! to the list specified by the target, rather than replace.
37 use crate::abi::Endian;
38 use crate::json::{Json, ToJson};
39 use crate::spec::abi::{lookup as lookup_abi, Abi};
40 use crate::spec::crt_objects::{CrtObjects, LinkSelfContainedDefault};
41 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
42 use rustc_serialize::{Decodable, Decoder, Encodable, Encoder};
43 use rustc_span::symbol::{sym, Symbol};
44 use serde_json::Value;
46 use std::collections::BTreeMap;
47 use std::convert::TryFrom;
48 use std::hash::{Hash, Hasher};
49 use std::iter::FromIterator;
50 use std::ops::{Deref, DerefMut};
51 use std::path::{Path, PathBuf};
52 use std::str::FromStr;
55 use rustc_macros::HashStable_Generic;
74 mod linux_kernel_base;
76 mod linux_uclibc_base;
88 mod windows_gnullvm_base;
89 mod windows_msvc_base;
90 mod windows_uwp_gnu_base;
91 mod windows_uwp_msvc_base;
93 #[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
94 pub enum LinkerFlavor {
105 #[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
114 pub fn as_str(&self) -> &'static str {
116 LldFlavor::Wasm => "wasm",
117 LldFlavor::Ld64 => "darwin",
118 LldFlavor::Ld => "gnu",
119 LldFlavor::Link => "link",
123 fn from_str(s: &str) -> Option<Self> {
125 "darwin" => LldFlavor::Ld64,
126 "gnu" => LldFlavor::Ld,
127 "link" => LldFlavor::Link,
128 "wasm" => LldFlavor::Wasm,
134 impl ToJson for LldFlavor {
135 fn to_json(&self) -> Json {
136 self.as_str().to_json()
140 impl ToJson for LinkerFlavor {
141 fn to_json(&self) -> Json {
142 self.desc().to_json()
145 macro_rules! flavor_mappings {
146 ($((($($flavor:tt)*), $string:expr),)*) => (
148 pub const fn one_of() -> &'static str {
149 concat!("one of: ", $($string, " ",)*)
152 pub fn from_str(s: &str) -> Option<Self> {
154 $($string => $($flavor)*,)*
159 pub fn desc(&self) -> &str {
161 $($($flavor)* => $string,)*
169 ((LinkerFlavor::Em), "em"),
170 ((LinkerFlavor::Gcc), "gcc"),
171 ((LinkerFlavor::L4Bender), "l4-bender"),
172 ((LinkerFlavor::Ld), "ld"),
173 ((LinkerFlavor::Msvc), "msvc"),
174 ((LinkerFlavor::PtxLinker), "ptx-linker"),
175 ((LinkerFlavor::BpfLinker), "bpf-linker"),
176 ((LinkerFlavor::Lld(LldFlavor::Wasm)), "wasm-ld"),
177 ((LinkerFlavor::Lld(LldFlavor::Ld64)), "ld64.lld"),
178 ((LinkerFlavor::Lld(LldFlavor::Ld)), "ld.lld"),
179 ((LinkerFlavor::Lld(LldFlavor::Link)), "lld-link"),
182 #[derive(Clone, Copy, Debug, PartialEq, Hash, Encodable, Decodable, HashStable_Generic)]
183 pub enum PanicStrategy {
189 pub fn desc(&self) -> &str {
191 PanicStrategy::Unwind => "unwind",
192 PanicStrategy::Abort => "abort",
196 pub const fn desc_symbol(&self) -> Symbol {
198 PanicStrategy::Unwind => sym::unwind,
199 PanicStrategy::Abort => sym::abort,
203 pub const fn all() -> [Symbol; 2] {
204 [Self::Abort.desc_symbol(), Self::Unwind.desc_symbol()]
208 impl ToJson for PanicStrategy {
209 fn to_json(&self) -> Json {
211 PanicStrategy::Abort => "abort".to_json(),
212 PanicStrategy::Unwind => "unwind".to_json(),
217 #[derive(Clone, Copy, Debug, PartialEq, Hash)]
218 pub enum RelroLevel {
226 pub fn desc(&self) -> &str {
228 RelroLevel::Full => "full",
229 RelroLevel::Partial => "partial",
230 RelroLevel::Off => "off",
231 RelroLevel::None => "none",
236 impl FromStr for RelroLevel {
239 fn from_str(s: &str) -> Result<RelroLevel, ()> {
241 "full" => Ok(RelroLevel::Full),
242 "partial" => Ok(RelroLevel::Partial),
243 "off" => Ok(RelroLevel::Off),
244 "none" => Ok(RelroLevel::None),
250 impl ToJson for RelroLevel {
251 fn to_json(&self) -> Json {
253 RelroLevel::Full => "full".to_json(),
254 RelroLevel::Partial => "partial".to_json(),
255 RelroLevel::Off => "off".to_json(),
256 RelroLevel::None => "None".to_json(),
261 #[derive(Clone, Copy, Debug, PartialEq, Hash)]
262 pub enum MergeFunctions {
268 impl MergeFunctions {
269 pub fn desc(&self) -> &str {
271 MergeFunctions::Disabled => "disabled",
272 MergeFunctions::Trampolines => "trampolines",
273 MergeFunctions::Aliases => "aliases",
278 impl FromStr for MergeFunctions {
281 fn from_str(s: &str) -> Result<MergeFunctions, ()> {
283 "disabled" => Ok(MergeFunctions::Disabled),
284 "trampolines" => Ok(MergeFunctions::Trampolines),
285 "aliases" => Ok(MergeFunctions::Aliases),
291 impl ToJson for MergeFunctions {
292 fn to_json(&self) -> Json {
294 MergeFunctions::Disabled => "disabled".to_json(),
295 MergeFunctions::Trampolines => "trampolines".to_json(),
296 MergeFunctions::Aliases => "aliases".to_json(),
301 #[derive(Clone, Copy, PartialEq, Hash, Debug)]
302 pub enum RelocModel {
312 impl FromStr for RelocModel {
315 fn from_str(s: &str) -> Result<RelocModel, ()> {
317 "static" => RelocModel::Static,
318 "pic" => RelocModel::Pic,
319 "pie" => RelocModel::Pie,
320 "dynamic-no-pic" => RelocModel::DynamicNoPic,
321 "ropi" => RelocModel::Ropi,
322 "rwpi" => RelocModel::Rwpi,
323 "ropi-rwpi" => RelocModel::RopiRwpi,
329 impl ToJson for RelocModel {
330 fn to_json(&self) -> Json {
332 RelocModel::Static => "static",
333 RelocModel::Pic => "pic",
334 RelocModel::Pie => "pie",
335 RelocModel::DynamicNoPic => "dynamic-no-pic",
336 RelocModel::Ropi => "ropi",
337 RelocModel::Rwpi => "rwpi",
338 RelocModel::RopiRwpi => "ropi-rwpi",
344 #[derive(Clone, Copy, PartialEq, Hash, Debug)]
353 impl FromStr for CodeModel {
356 fn from_str(s: &str) -> Result<CodeModel, ()> {
358 "tiny" => CodeModel::Tiny,
359 "small" => CodeModel::Small,
360 "kernel" => CodeModel::Kernel,
361 "medium" => CodeModel::Medium,
362 "large" => CodeModel::Large,
368 impl ToJson for CodeModel {
369 fn to_json(&self) -> Json {
371 CodeModel::Tiny => "tiny",
372 CodeModel::Small => "small",
373 CodeModel::Kernel => "kernel",
374 CodeModel::Medium => "medium",
375 CodeModel::Large => "large",
381 #[derive(Clone, Copy, PartialEq, Hash, Debug)]
389 impl FromStr for TlsModel {
392 fn from_str(s: &str) -> Result<TlsModel, ()> {
394 // Note the difference "general" vs "global" difference. The model name is "general",
395 // but the user-facing option name is "global" for consistency with other compilers.
396 "global-dynamic" => TlsModel::GeneralDynamic,
397 "local-dynamic" => TlsModel::LocalDynamic,
398 "initial-exec" => TlsModel::InitialExec,
399 "local-exec" => TlsModel::LocalExec,
405 impl ToJson for TlsModel {
406 fn to_json(&self) -> Json {
408 TlsModel::GeneralDynamic => "global-dynamic",
409 TlsModel::LocalDynamic => "local-dynamic",
410 TlsModel::InitialExec => "initial-exec",
411 TlsModel::LocalExec => "local-exec",
417 /// Everything is flattened to a single enum to make the json encoding/decoding less annoying.
418 #[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Debug)]
419 pub enum LinkOutputKind {
420 /// Dynamically linked non position-independent executable.
422 /// Dynamically linked position-independent executable.
424 /// Statically linked non position-independent executable.
426 /// Statically linked position-independent executable.
428 /// Regular dynamic library ("dynamically linked").
430 /// Dynamic library with bundled libc ("statically linked").
432 /// WASI module with a lifetime past the _initialize entry point
436 impl LinkOutputKind {
437 fn as_str(&self) -> &'static str {
439 LinkOutputKind::DynamicNoPicExe => "dynamic-nopic-exe",
440 LinkOutputKind::DynamicPicExe => "dynamic-pic-exe",
441 LinkOutputKind::StaticNoPicExe => "static-nopic-exe",
442 LinkOutputKind::StaticPicExe => "static-pic-exe",
443 LinkOutputKind::DynamicDylib => "dynamic-dylib",
444 LinkOutputKind::StaticDylib => "static-dylib",
445 LinkOutputKind::WasiReactorExe => "wasi-reactor-exe",
449 pub(super) fn from_str(s: &str) -> Option<LinkOutputKind> {
451 "dynamic-nopic-exe" => LinkOutputKind::DynamicNoPicExe,
452 "dynamic-pic-exe" => LinkOutputKind::DynamicPicExe,
453 "static-nopic-exe" => LinkOutputKind::StaticNoPicExe,
454 "static-pic-exe" => LinkOutputKind::StaticPicExe,
455 "dynamic-dylib" => LinkOutputKind::DynamicDylib,
456 "static-dylib" => LinkOutputKind::StaticDylib,
457 "wasi-reactor-exe" => LinkOutputKind::WasiReactorExe,
463 impl fmt::Display for LinkOutputKind {
464 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
465 f.write_str(self.as_str())
469 pub type LinkArgs = BTreeMap<LinkerFlavor, Vec<StaticCow<str>>>;
471 /// Which kind of debuginfo does the target use?
473 /// Useful in determining whether a target supports Split DWARF (a target with
474 /// `DebuginfoKind::Dwarf` and supporting `SplitDebuginfo::Unpacked` for example).
475 #[derive(Clone, Copy, Debug, Default, Eq, Hash, PartialEq)]
476 pub enum DebuginfoKind {
477 /// DWARF debuginfo (such as that used on `x86_64_unknown_linux_gnu`).
480 /// DWARF debuginfo in dSYM files (such as on Apple platforms).
482 /// Program database files (such as on Windows).
487 fn as_str(&self) -> &'static str {
489 DebuginfoKind::Dwarf => "dwarf",
490 DebuginfoKind::DwarfDsym => "dwarf-dsym",
491 DebuginfoKind::Pdb => "pdb",
496 impl FromStr for DebuginfoKind {
499 fn from_str(s: &str) -> Result<Self, ()> {
501 "dwarf" => DebuginfoKind::Dwarf,
502 "dwarf-dsym" => DebuginfoKind::DwarfDsym,
503 "pdb" => DebuginfoKind::Pdb,
509 impl ToJson for DebuginfoKind {
510 fn to_json(&self) -> Json {
511 self.as_str().to_json()
515 impl fmt::Display for DebuginfoKind {
516 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
517 f.write_str(self.as_str())
521 #[derive(Clone, Copy, Debug, Default, Eq, Hash, PartialEq)]
522 pub enum SplitDebuginfo {
523 /// Split debug-information is disabled, meaning that on supported platforms
524 /// you can find all debug information in the executable itself. This is
525 /// only supported for ELF effectively.
527 /// * Windows - not supported
528 /// * macOS - don't run `dsymutil`
529 /// * ELF - `.debug_*` sections
533 /// Split debug-information can be found in a "packed" location separate
534 /// from the final artifact. This is supported on all platforms.
536 /// * Windows - `*.pdb`
537 /// * macOS - `*.dSYM` (run `dsymutil`)
538 /// * ELF - `*.dwp` (run `thorin`)
541 /// Split debug-information can be found in individual object files on the
542 /// filesystem. The main executable may point to the object files.
544 /// * Windows - not supported
545 /// * macOS - supported, scattered object files
546 /// * ELF - supported, scattered `*.dwo` or `*.o` files (see `SplitDwarfKind`)
550 impl SplitDebuginfo {
551 fn as_str(&self) -> &'static str {
553 SplitDebuginfo::Off => "off",
554 SplitDebuginfo::Packed => "packed",
555 SplitDebuginfo::Unpacked => "unpacked",
560 impl FromStr for SplitDebuginfo {
563 fn from_str(s: &str) -> Result<Self, ()> {
565 "off" => SplitDebuginfo::Off,
566 "unpacked" => SplitDebuginfo::Unpacked,
567 "packed" => SplitDebuginfo::Packed,
573 impl ToJson for SplitDebuginfo {
574 fn to_json(&self) -> Json {
575 self.as_str().to_json()
579 impl fmt::Display for SplitDebuginfo {
580 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
581 f.write_str(self.as_str())
585 #[derive(Clone, Debug, PartialEq, Eq)]
586 pub enum StackProbeType {
587 /// Don't emit any stack probes.
589 /// It is harmless to use this option even on targets that do not have backend support for
590 /// stack probes as the failure mode is the same as if no stack-probe option was specified in
593 /// Call `__rust_probestack` whenever stack needs to be probed.
595 /// Use inline option for LLVM versions later than specified in `min_llvm_version_for_inline`
596 /// and call `__rust_probestack` otherwise.
597 InlineOrCall { min_llvm_version_for_inline: (u32, u32, u32) },
600 impl StackProbeType {
601 fn from_json(json: &Json) -> Result<Self, String> {
602 let object = json.as_object().ok_or_else(|| "expected a JSON object")?;
605 .and_then(|o| o.as_str())
606 .ok_or_else(|| "expected `kind` to be a string")?;
608 "none" => Ok(StackProbeType::None),
609 "inline" => Ok(StackProbeType::Inline),
610 "call" => Ok(StackProbeType::Call),
611 "inline-or-call" => {
612 let min_version = object
613 .get("min-llvm-version-for-inline")
614 .and_then(|o| o.as_array())
615 .ok_or_else(|| "expected `min-llvm-version-for-inline` to be an array")?;
616 let mut iter = min_version.into_iter().map(|v| {
617 let int = v.as_u64().ok_or_else(
618 || "expected `min-llvm-version-for-inline` values to be integers",
621 .map_err(|_| "`min-llvm-version-for-inline` values don't convert to u32")
623 let min_llvm_version_for_inline = (
624 iter.next().unwrap_or(Ok(11))?,
625 iter.next().unwrap_or(Ok(0))?,
626 iter.next().unwrap_or(Ok(0))?,
628 Ok(StackProbeType::InlineOrCall { min_llvm_version_for_inline })
630 _ => Err(String::from(
631 "`kind` expected to be one of `none`, `inline`, `call` or `inline-or-call`",
637 impl ToJson for StackProbeType {
638 fn to_json(&self) -> Json {
639 Json::Object(match self {
640 StackProbeType::None => {
641 [(String::from("kind"), "none".to_json())].into_iter().collect()
643 StackProbeType::Inline => {
644 [(String::from("kind"), "inline".to_json())].into_iter().collect()
646 StackProbeType::Call => {
647 [(String::from("kind"), "call".to_json())].into_iter().collect()
649 StackProbeType::InlineOrCall { min_llvm_version_for_inline: (maj, min, patch) } => [
650 (String::from("kind"), "inline-or-call".to_json()),
652 String::from("min-llvm-version-for-inline"),
653 Json::Array(vec![maj.to_json(), min.to_json(), patch.to_json()]),
662 bitflags::bitflags! {
663 #[derive(Default, Encodable, Decodable)]
664 pub struct SanitizerSet: u8 {
665 const ADDRESS = 1 << 0;
667 const MEMORY = 1 << 2;
668 const THREAD = 1 << 3;
669 const HWADDRESS = 1 << 4;
671 const MEMTAG = 1 << 6;
672 const SHADOWCALLSTACK = 1 << 7;
677 /// Return sanitizer's name
679 /// Returns none if the flags is a set of sanitizers numbering not exactly one.
680 pub fn as_str(self) -> Option<&'static str> {
682 SanitizerSet::ADDRESS => "address",
683 SanitizerSet::CFI => "cfi",
684 SanitizerSet::LEAK => "leak",
685 SanitizerSet::MEMORY => "memory",
686 SanitizerSet::MEMTAG => "memtag",
687 SanitizerSet::SHADOWCALLSTACK => "shadow-call-stack",
688 SanitizerSet::THREAD => "thread",
689 SanitizerSet::HWADDRESS => "hwaddress",
695 /// Formats a sanitizer set as a comma separated list of sanitizers' names.
696 impl fmt::Display for SanitizerSet {
697 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
698 let mut first = true;
700 let name = s.as_str().unwrap_or_else(|| panic!("unrecognized sanitizer {:?}", s));
711 impl IntoIterator for SanitizerSet {
712 type Item = SanitizerSet;
713 type IntoIter = std::vec::IntoIter<SanitizerSet>;
715 fn into_iter(self) -> Self::IntoIter {
717 SanitizerSet::ADDRESS,
720 SanitizerSet::MEMORY,
721 SanitizerSet::MEMTAG,
722 SanitizerSet::SHADOWCALLSTACK,
723 SanitizerSet::THREAD,
724 SanitizerSet::HWADDRESS,
728 .filter(|&s| self.contains(s))
734 impl<CTX> HashStable<CTX> for SanitizerSet {
735 fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher) {
736 self.bits().hash_stable(ctx, hasher);
740 impl ToJson for SanitizerSet {
741 fn to_json(&self) -> Json {
743 .map(|v| Some(v.as_str()?.to_json()))
744 .collect::<Option<Vec<_>>>()
750 #[derive(Clone, Copy, PartialEq, Hash, Debug)]
751 pub enum FramePointer {
752 /// Forces the machine code generator to always preserve the frame pointers.
754 /// Forces the machine code generator to preserve the frame pointers except for the leaf
755 /// functions (i.e. those that don't call other functions).
757 /// Allows the machine code generator to omit the frame pointers.
759 /// This option does not guarantee that the frame pointers will be omitted.
763 impl FromStr for FramePointer {
765 fn from_str(s: &str) -> Result<Self, ()> {
767 "always" => Self::Always,
768 "non-leaf" => Self::NonLeaf,
769 "may-omit" => Self::MayOmit,
775 impl ToJson for FramePointer {
776 fn to_json(&self) -> Json {
778 Self::Always => "always",
779 Self::NonLeaf => "non-leaf",
780 Self::MayOmit => "may-omit",
786 /// Controls use of stack canaries.
787 #[derive(Clone, Copy, Debug, PartialEq, Hash, Eq)]
788 pub enum StackProtector {
789 /// Disable stack canary generation.
792 /// On LLVM, mark all generated LLVM functions with the `ssp` attribute (see
793 /// llvm/docs/LangRef.rst). This triggers stack canary generation in
794 /// functions which contain an array of a byte-sized type with more than
798 /// On LLVM, mark all generated LLVM functions with the `sspstrong`
799 /// attribute (see llvm/docs/LangRef.rst). This triggers stack canary
800 /// generation in functions which either contain an array, or which take
801 /// the address of a local variable.
804 /// Generate stack canaries in all functions.
808 impl StackProtector {
809 fn as_str(&self) -> &'static str {
811 StackProtector::None => "none",
812 StackProtector::Basic => "basic",
813 StackProtector::Strong => "strong",
814 StackProtector::All => "all",
819 impl FromStr for StackProtector {
822 fn from_str(s: &str) -> Result<StackProtector, ()> {
824 "none" => StackProtector::None,
825 "basic" => StackProtector::Basic,
826 "strong" => StackProtector::Strong,
827 "all" => StackProtector::All,
833 impl fmt::Display for StackProtector {
834 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
835 f.write_str(self.as_str())
839 macro_rules! supported_targets {
840 ( $(($triple:literal, $module:ident ),)+ ) => {
843 /// List of supported targets
844 pub const TARGETS: &[&str] = &[$($triple),+];
846 fn load_builtin(target: &str) -> Option<Target> {
847 let mut t = match target {
848 $( $triple => $module::target(), )+
852 debug!("got builtin target: {:?}", t);
860 // Cannot put this into a separate file without duplication, make an exception.
864 tests_impl::test_target(super::$module::target(), $triple);
872 ("x86_64-unknown-linux-gnu", x86_64_unknown_linux_gnu),
873 ("x86_64-unknown-linux-gnux32", x86_64_unknown_linux_gnux32),
874 ("i686-unknown-linux-gnu", i686_unknown_linux_gnu),
875 ("i586-unknown-linux-gnu", i586_unknown_linux_gnu),
876 ("m68k-unknown-linux-gnu", m68k_unknown_linux_gnu),
877 ("mips-unknown-linux-gnu", mips_unknown_linux_gnu),
878 ("mips64-unknown-linux-gnuabi64", mips64_unknown_linux_gnuabi64),
879 ("mips64el-unknown-linux-gnuabi64", mips64el_unknown_linux_gnuabi64),
880 ("mipsisa32r6-unknown-linux-gnu", mipsisa32r6_unknown_linux_gnu),
881 ("mipsisa32r6el-unknown-linux-gnu", mipsisa32r6el_unknown_linux_gnu),
882 ("mipsisa64r6-unknown-linux-gnuabi64", mipsisa64r6_unknown_linux_gnuabi64),
883 ("mipsisa64r6el-unknown-linux-gnuabi64", mipsisa64r6el_unknown_linux_gnuabi64),
884 ("mipsel-unknown-linux-gnu", mipsel_unknown_linux_gnu),
885 ("powerpc-unknown-linux-gnu", powerpc_unknown_linux_gnu),
886 ("powerpc-unknown-linux-gnuspe", powerpc_unknown_linux_gnuspe),
887 ("powerpc-unknown-linux-musl", powerpc_unknown_linux_musl),
888 ("powerpc64-unknown-linux-gnu", powerpc64_unknown_linux_gnu),
889 ("powerpc64-unknown-linux-musl", powerpc64_unknown_linux_musl),
890 ("powerpc64le-unknown-linux-gnu", powerpc64le_unknown_linux_gnu),
891 ("powerpc64le-unknown-linux-musl", powerpc64le_unknown_linux_musl),
892 ("s390x-unknown-linux-gnu", s390x_unknown_linux_gnu),
893 ("s390x-unknown-linux-musl", s390x_unknown_linux_musl),
894 ("sparc-unknown-linux-gnu", sparc_unknown_linux_gnu),
895 ("sparc64-unknown-linux-gnu", sparc64_unknown_linux_gnu),
896 ("arm-unknown-linux-gnueabi", arm_unknown_linux_gnueabi),
897 ("arm-unknown-linux-gnueabihf", arm_unknown_linux_gnueabihf),
898 ("arm-unknown-linux-musleabi", arm_unknown_linux_musleabi),
899 ("arm-unknown-linux-musleabihf", arm_unknown_linux_musleabihf),
900 ("armv4t-unknown-linux-gnueabi", armv4t_unknown_linux_gnueabi),
901 ("armv5te-unknown-linux-gnueabi", armv5te_unknown_linux_gnueabi),
902 ("armv5te-unknown-linux-musleabi", armv5te_unknown_linux_musleabi),
903 ("armv5te-unknown-linux-uclibceabi", armv5te_unknown_linux_uclibceabi),
904 ("armv7-unknown-linux-gnueabi", armv7_unknown_linux_gnueabi),
905 ("armv7-unknown-linux-gnueabihf", armv7_unknown_linux_gnueabihf),
906 ("thumbv7neon-unknown-linux-gnueabihf", thumbv7neon_unknown_linux_gnueabihf),
907 ("thumbv7neon-unknown-linux-musleabihf", thumbv7neon_unknown_linux_musleabihf),
908 ("armv7-unknown-linux-musleabi", armv7_unknown_linux_musleabi),
909 ("armv7-unknown-linux-musleabihf", armv7_unknown_linux_musleabihf),
910 ("aarch64-unknown-linux-gnu", aarch64_unknown_linux_gnu),
911 ("aarch64-unknown-linux-musl", aarch64_unknown_linux_musl),
912 ("x86_64-unknown-linux-musl", x86_64_unknown_linux_musl),
913 ("i686-unknown-linux-musl", i686_unknown_linux_musl),
914 ("i586-unknown-linux-musl", i586_unknown_linux_musl),
915 ("mips-unknown-linux-musl", mips_unknown_linux_musl),
916 ("mipsel-unknown-linux-musl", mipsel_unknown_linux_musl),
917 ("mips64-unknown-linux-muslabi64", mips64_unknown_linux_muslabi64),
918 ("mips64el-unknown-linux-muslabi64", mips64el_unknown_linux_muslabi64),
919 ("hexagon-unknown-linux-musl", hexagon_unknown_linux_musl),
921 ("mips-unknown-linux-uclibc", mips_unknown_linux_uclibc),
922 ("mipsel-unknown-linux-uclibc", mipsel_unknown_linux_uclibc),
924 ("i686-linux-android", i686_linux_android),
925 ("x86_64-linux-android", x86_64_linux_android),
926 ("arm-linux-androideabi", arm_linux_androideabi),
927 ("armv7-linux-androideabi", armv7_linux_androideabi),
928 ("thumbv7neon-linux-androideabi", thumbv7neon_linux_androideabi),
929 ("aarch64-linux-android", aarch64_linux_android),
931 ("x86_64-unknown-none-linuxkernel", x86_64_unknown_none_linuxkernel),
933 ("aarch64-unknown-freebsd", aarch64_unknown_freebsd),
934 ("armv6-unknown-freebsd", armv6_unknown_freebsd),
935 ("armv7-unknown-freebsd", armv7_unknown_freebsd),
936 ("i686-unknown-freebsd", i686_unknown_freebsd),
937 ("powerpc-unknown-freebsd", powerpc_unknown_freebsd),
938 ("powerpc64-unknown-freebsd", powerpc64_unknown_freebsd),
939 ("powerpc64le-unknown-freebsd", powerpc64le_unknown_freebsd),
940 ("riscv64gc-unknown-freebsd", riscv64gc_unknown_freebsd),
941 ("x86_64-unknown-freebsd", x86_64_unknown_freebsd),
943 ("x86_64-unknown-dragonfly", x86_64_unknown_dragonfly),
945 ("aarch64-unknown-openbsd", aarch64_unknown_openbsd),
946 ("i686-unknown-openbsd", i686_unknown_openbsd),
947 ("sparc64-unknown-openbsd", sparc64_unknown_openbsd),
948 ("x86_64-unknown-openbsd", x86_64_unknown_openbsd),
949 ("powerpc-unknown-openbsd", powerpc_unknown_openbsd),
951 ("aarch64-unknown-netbsd", aarch64_unknown_netbsd),
952 ("armv6-unknown-netbsd-eabihf", armv6_unknown_netbsd_eabihf),
953 ("armv7-unknown-netbsd-eabihf", armv7_unknown_netbsd_eabihf),
954 ("i686-unknown-netbsd", i686_unknown_netbsd),
955 ("powerpc-unknown-netbsd", powerpc_unknown_netbsd),
956 ("sparc64-unknown-netbsd", sparc64_unknown_netbsd),
957 ("x86_64-unknown-netbsd", x86_64_unknown_netbsd),
959 ("i686-unknown-haiku", i686_unknown_haiku),
960 ("x86_64-unknown-haiku", x86_64_unknown_haiku),
962 ("aarch64-apple-darwin", aarch64_apple_darwin),
963 ("x86_64-apple-darwin", x86_64_apple_darwin),
964 ("i686-apple-darwin", i686_apple_darwin),
966 ("aarch64-fuchsia", aarch64_fuchsia),
967 ("x86_64-fuchsia", x86_64_fuchsia),
969 ("avr-unknown-gnu-atmega328", avr_unknown_gnu_atmega328),
971 ("x86_64-unknown-l4re-uclibc", x86_64_unknown_l4re_uclibc),
973 ("aarch64-unknown-redox", aarch64_unknown_redox),
974 ("x86_64-unknown-redox", x86_64_unknown_redox),
976 ("i386-apple-ios", i386_apple_ios),
977 ("x86_64-apple-ios", x86_64_apple_ios),
978 ("aarch64-apple-ios", aarch64_apple_ios),
979 ("armv7-apple-ios", armv7_apple_ios),
980 ("armv7s-apple-ios", armv7s_apple_ios),
981 ("x86_64-apple-ios-macabi", x86_64_apple_ios_macabi),
982 ("aarch64-apple-ios-macabi", aarch64_apple_ios_macabi),
983 ("aarch64-apple-ios-sim", aarch64_apple_ios_sim),
984 ("aarch64-apple-tvos", aarch64_apple_tvos),
985 ("x86_64-apple-tvos", x86_64_apple_tvos),
987 ("armv7k-apple-watchos", armv7k_apple_watchos),
988 ("arm64_32-apple-watchos", arm64_32_apple_watchos),
989 ("x86_64-apple-watchos-sim", x86_64_apple_watchos_sim),
990 ("aarch64-apple-watchos-sim", aarch64_apple_watchos_sim),
992 ("armebv7r-none-eabi", armebv7r_none_eabi),
993 ("armebv7r-none-eabihf", armebv7r_none_eabihf),
994 ("armv7r-none-eabi", armv7r_none_eabi),
995 ("armv7r-none-eabihf", armv7r_none_eabihf),
997 ("x86_64-pc-solaris", x86_64_pc_solaris),
998 ("x86_64-sun-solaris", x86_64_sun_solaris),
999 ("sparcv9-sun-solaris", sparcv9_sun_solaris),
1001 ("x86_64-unknown-illumos", x86_64_unknown_illumos),
1003 ("x86_64-pc-windows-gnu", x86_64_pc_windows_gnu),
1004 ("i686-pc-windows-gnu", i686_pc_windows_gnu),
1005 ("i686-uwp-windows-gnu", i686_uwp_windows_gnu),
1006 ("x86_64-uwp-windows-gnu", x86_64_uwp_windows_gnu),
1008 ("aarch64-pc-windows-gnullvm", aarch64_pc_windows_gnullvm),
1009 ("x86_64-pc-windows-gnullvm", x86_64_pc_windows_gnullvm),
1011 ("aarch64-pc-windows-msvc", aarch64_pc_windows_msvc),
1012 ("aarch64-uwp-windows-msvc", aarch64_uwp_windows_msvc),
1013 ("x86_64-pc-windows-msvc", x86_64_pc_windows_msvc),
1014 ("x86_64-uwp-windows-msvc", x86_64_uwp_windows_msvc),
1015 ("i686-pc-windows-msvc", i686_pc_windows_msvc),
1016 ("i686-uwp-windows-msvc", i686_uwp_windows_msvc),
1017 ("i586-pc-windows-msvc", i586_pc_windows_msvc),
1018 ("thumbv7a-pc-windows-msvc", thumbv7a_pc_windows_msvc),
1019 ("thumbv7a-uwp-windows-msvc", thumbv7a_uwp_windows_msvc),
1021 ("asmjs-unknown-emscripten", asmjs_unknown_emscripten),
1022 ("wasm32-unknown-emscripten", wasm32_unknown_emscripten),
1023 ("wasm32-unknown-unknown", wasm32_unknown_unknown),
1024 ("wasm32-wasi", wasm32_wasi),
1025 ("wasm64-unknown-unknown", wasm64_unknown_unknown),
1027 ("thumbv6m-none-eabi", thumbv6m_none_eabi),
1028 ("thumbv7m-none-eabi", thumbv7m_none_eabi),
1029 ("thumbv7em-none-eabi", thumbv7em_none_eabi),
1030 ("thumbv7em-none-eabihf", thumbv7em_none_eabihf),
1031 ("thumbv8m.base-none-eabi", thumbv8m_base_none_eabi),
1032 ("thumbv8m.main-none-eabi", thumbv8m_main_none_eabi),
1033 ("thumbv8m.main-none-eabihf", thumbv8m_main_none_eabihf),
1035 ("armv7a-none-eabi", armv7a_none_eabi),
1036 ("armv7a-none-eabihf", armv7a_none_eabihf),
1038 ("msp430-none-elf", msp430_none_elf),
1040 ("aarch64-unknown-hermit", aarch64_unknown_hermit),
1041 ("x86_64-unknown-hermit", x86_64_unknown_hermit),
1043 ("riscv32i-unknown-none-elf", riscv32i_unknown_none_elf),
1044 ("riscv32im-unknown-none-elf", riscv32im_unknown_none_elf),
1045 ("riscv32imc-unknown-none-elf", riscv32imc_unknown_none_elf),
1046 ("riscv32imc-esp-espidf", riscv32imc_esp_espidf),
1047 ("riscv32imac-unknown-none-elf", riscv32imac_unknown_none_elf),
1048 ("riscv32imac-unknown-xous-elf", riscv32imac_unknown_xous_elf),
1049 ("riscv32gc-unknown-linux-gnu", riscv32gc_unknown_linux_gnu),
1050 ("riscv32gc-unknown-linux-musl", riscv32gc_unknown_linux_musl),
1051 ("riscv64imac-unknown-none-elf", riscv64imac_unknown_none_elf),
1052 ("riscv64gc-unknown-none-elf", riscv64gc_unknown_none_elf),
1053 ("riscv64gc-unknown-linux-gnu", riscv64gc_unknown_linux_gnu),
1054 ("riscv64gc-unknown-linux-musl", riscv64gc_unknown_linux_musl),
1056 ("aarch64-unknown-none", aarch64_unknown_none),
1057 ("aarch64-unknown-none-softfloat", aarch64_unknown_none_softfloat),
1059 ("x86_64-fortanix-unknown-sgx", x86_64_fortanix_unknown_sgx),
1061 ("x86_64-unknown-uefi", x86_64_unknown_uefi),
1062 ("i686-unknown-uefi", i686_unknown_uefi),
1063 ("aarch64-unknown-uefi", aarch64_unknown_uefi),
1065 ("nvptx64-nvidia-cuda", nvptx64_nvidia_cuda),
1067 ("i686-wrs-vxworks", i686_wrs_vxworks),
1068 ("x86_64-wrs-vxworks", x86_64_wrs_vxworks),
1069 ("armv7-wrs-vxworks-eabihf", armv7_wrs_vxworks_eabihf),
1070 ("aarch64-wrs-vxworks", aarch64_wrs_vxworks),
1071 ("powerpc-wrs-vxworks", powerpc_wrs_vxworks),
1072 ("powerpc-wrs-vxworks-spe", powerpc_wrs_vxworks_spe),
1073 ("powerpc64-wrs-vxworks", powerpc64_wrs_vxworks),
1075 ("aarch64-kmc-solid_asp3", aarch64_kmc_solid_asp3),
1076 ("armv7a-kmc-solid_asp3-eabi", armv7a_kmc_solid_asp3_eabi),
1077 ("armv7a-kmc-solid_asp3-eabihf", armv7a_kmc_solid_asp3_eabihf),
1079 ("mipsel-sony-psp", mipsel_sony_psp),
1080 ("mipsel-unknown-none", mipsel_unknown_none),
1081 ("thumbv4t-none-eabi", thumbv4t_none_eabi),
1082 ("armv4t-none-eabi", armv4t_none_eabi),
1084 ("aarch64_be-unknown-linux-gnu", aarch64_be_unknown_linux_gnu),
1085 ("aarch64-unknown-linux-gnu_ilp32", aarch64_unknown_linux_gnu_ilp32),
1086 ("aarch64_be-unknown-linux-gnu_ilp32", aarch64_be_unknown_linux_gnu_ilp32),
1088 ("bpfeb-unknown-none", bpfeb_unknown_none),
1089 ("bpfel-unknown-none", bpfel_unknown_none),
1091 ("armv6k-nintendo-3ds", armv6k_nintendo_3ds),
1093 ("aarch64-nintendo-switch-freestanding", aarch64_nintendo_switch_freestanding),
1095 ("armv7-unknown-linux-uclibceabi", armv7_unknown_linux_uclibceabi),
1096 ("armv7-unknown-linux-uclibceabihf", armv7_unknown_linux_uclibceabihf),
1098 ("x86_64-unknown-none", x86_64_unknown_none),
1100 ("mips64-openwrt-linux-musl", mips64_openwrt_linux_musl),
1103 /// Cow-Vec-Str: Cow<'static, [Cow<'static, str>]>
1106 ::std::borrow::Cow::Borrowed(&[])
1108 ($($x:expr),+ $(,)?) => {
1109 ::std::borrow::Cow::Borrowed(&[
1111 ::std::borrow::Cow::Borrowed($x),
1119 /// Warnings encountered when parsing the target `json`.
1121 /// Includes fields that weren't recognized and fields that don't have the expected type.
1122 #[derive(Debug, PartialEq)]
1123 pub struct TargetWarnings {
1124 unused_fields: Vec<String>,
1125 incorrect_type: Vec<String>,
1128 impl TargetWarnings {
1129 pub fn empty() -> Self {
1130 Self { unused_fields: Vec::new(), incorrect_type: Vec::new() }
1133 pub fn warning_messages(&self) -> Vec<String> {
1134 let mut warnings = vec![];
1135 if !self.unused_fields.is_empty() {
1136 warnings.push(format!(
1137 "target json file contains unused fields: {}",
1138 self.unused_fields.join(", ")
1141 if !self.incorrect_type.is_empty() {
1142 warnings.push(format!(
1143 "target json file contains fields whose value doesn't have the correct json type: {}",
1144 self.incorrect_type.join(", ")
1151 /// Everything `rustc` knows about how to compile for a specific target.
1153 /// Every field here must be specified, and has no default value.
1154 #[derive(PartialEq, Clone, Debug)]
1156 /// Target triple to pass to LLVM.
1157 pub llvm_target: StaticCow<str>,
1158 /// Number of bits in a pointer. Influences the `target_pointer_width` `cfg` variable.
1159 pub pointer_width: u32,
1160 /// Architecture to use for ABI considerations. Valid options include: "x86",
1161 /// "x86_64", "arm", "aarch64", "mips", "powerpc", "powerpc64", and others.
1162 pub arch: StaticCow<str>,
1163 /// [Data layout](https://llvm.org/docs/LangRef.html#data-layout) to pass to LLVM.
1164 pub data_layout: StaticCow<str>,
1165 /// Optional settings with defaults.
1166 pub options: TargetOptions,
1169 pub trait HasTargetSpec {
1170 fn target_spec(&self) -> &Target;
1173 impl HasTargetSpec for Target {
1175 fn target_spec(&self) -> &Target {
1180 type StaticCow<T> = Cow<'static, T>;
1182 /// Optional aspects of a target specification.
1184 /// This has an implementation of `Default`, see each field for what the default is. In general,
1185 /// these try to take "minimal defaults" that don't assume anything about the runtime they run in.
1187 /// `TargetOptions` as a separate structure is mostly an implementation detail of `Target`
1188 /// construction, all its fields logically belong to `Target` and available from `Target`
1189 /// through `Deref` impls.
1190 #[derive(PartialEq, Clone, Debug)]
1191 pub struct TargetOptions {
1192 /// Whether the target is built-in or loaded from a custom target specification.
1193 pub is_builtin: bool,
1195 /// Used as the `target_endian` `cfg` variable. Defaults to little endian.
1197 /// Width of c_int type. Defaults to "32".
1198 pub c_int_width: StaticCow<str>,
1199 /// OS name to use for conditional compilation (`target_os`). Defaults to "none".
1200 /// "none" implies a bare metal target without `std` library.
1201 /// A couple of targets having `std` also use "unknown" as an `os` value,
1202 /// but they are exceptions.
1203 pub os: StaticCow<str>,
1204 /// Environment name to use for conditional compilation (`target_env`). Defaults to "".
1205 pub env: StaticCow<str>,
1206 /// ABI name to distinguish multiple ABIs on the same OS and architecture. For instance, `"eabi"`
1207 /// or `"eabihf"`. Defaults to "".
1208 pub abi: StaticCow<str>,
1209 /// Vendor name to use for conditional compilation (`target_vendor`). Defaults to "unknown".
1210 pub vendor: StaticCow<str>,
1211 /// Default linker flavor used if `-C linker-flavor` or `-C linker` are not passed
1212 /// on the command line. Defaults to `LinkerFlavor::Gcc`.
1213 pub linker_flavor: LinkerFlavor,
1215 /// Linker to invoke
1216 pub linker: Option<StaticCow<str>>,
1218 /// LLD flavor used if `lld` (or `rust-lld`) is specified as a linker
1219 /// without clarifying its flavor in any way.
1220 pub lld_flavor: LldFlavor,
1222 /// Linker arguments that are passed *before* any user-defined libraries.
1223 pub pre_link_args: LinkArgs,
1224 /// Objects to link before and after all other object code.
1225 pub pre_link_objects: CrtObjects,
1226 pub post_link_objects: CrtObjects,
1227 /// Same as `(pre|post)_link_objects`, but when self-contained linking mode is enabled.
1228 pub pre_link_objects_self_contained: CrtObjects,
1229 pub post_link_objects_self_contained: CrtObjects,
1230 pub link_self_contained: LinkSelfContainedDefault,
1232 /// Linker arguments that are unconditionally passed after any
1233 /// user-defined but before post-link objects. Standard platform
1234 /// libraries that should be always be linked to, usually go here.
1235 pub late_link_args: LinkArgs,
1236 /// Linker arguments used in addition to `late_link_args` if at least one
1237 /// Rust dependency is dynamically linked.
1238 pub late_link_args_dynamic: LinkArgs,
1239 /// Linker arguments used in addition to `late_link_args` if all Rust
1240 /// dependencies are statically linked.
1241 pub late_link_args_static: LinkArgs,
1242 /// Linker arguments that are unconditionally passed *after* any
1243 /// user-defined libraries.
1244 pub post_link_args: LinkArgs,
1245 /// Optional link script applied to `dylib` and `executable` crate types.
1246 /// This is a string containing the script, not a path. Can only be applied
1247 /// to linkers where `linker_is_gnu` is true.
1248 pub link_script: Option<StaticCow<str>>,
1250 /// Environment variables to be set for the linker invocation.
1251 pub link_env: StaticCow<[(StaticCow<str>, StaticCow<str>)]>,
1252 /// Environment variables to be removed for the linker invocation.
1253 pub link_env_remove: StaticCow<[StaticCow<str>]>,
1255 /// Extra arguments to pass to the external assembler (when used)
1256 pub asm_args: StaticCow<[StaticCow<str>]>,
1258 /// Default CPU to pass to LLVM. Corresponds to `llc -mcpu=$cpu`. Defaults
1260 pub cpu: StaticCow<str>,
1261 /// Default target features to pass to LLVM. These features will *always* be
1262 /// passed, and cannot be disabled even via `-C`. Corresponds to `llc
1263 /// -mattr=$features`.
1264 pub features: StaticCow<str>,
1265 /// Whether dynamic linking is available on this target. Defaults to false.
1266 pub dynamic_linking: bool,
1267 /// If dynamic linking is available, whether only cdylibs are supported.
1268 pub only_cdylib: bool,
1269 /// Whether executables are available on this target. Defaults to true.
1270 pub executables: bool,
1271 /// Relocation model to use in object file. Corresponds to `llc
1272 /// -relocation-model=$relocation_model`. Defaults to `Pic`.
1273 pub relocation_model: RelocModel,
1274 /// Code model to use. Corresponds to `llc -code-model=$code_model`.
1275 /// Defaults to `None` which means "inherited from the base LLVM target".
1276 pub code_model: Option<CodeModel>,
1277 /// TLS model to use. Options are "global-dynamic" (default), "local-dynamic", "initial-exec"
1278 /// and "local-exec". This is similar to the -ftls-model option in GCC/Clang.
1279 pub tls_model: TlsModel,
1280 /// Do not emit code that uses the "red zone", if the ABI has one. Defaults to false.
1281 pub disable_redzone: bool,
1282 /// Frame pointer mode for this target. Defaults to `MayOmit`.
1283 pub frame_pointer: FramePointer,
1284 /// Emit each function in its own section. Defaults to true.
1285 pub function_sections: bool,
1286 /// String to prepend to the name of every dynamic library. Defaults to "lib".
1287 pub dll_prefix: StaticCow<str>,
1288 /// String to append to the name of every dynamic library. Defaults to ".so".
1289 pub dll_suffix: StaticCow<str>,
1290 /// String to append to the name of every executable.
1291 pub exe_suffix: StaticCow<str>,
1292 /// String to prepend to the name of every static library. Defaults to "lib".
1293 pub staticlib_prefix: StaticCow<str>,
1294 /// String to append to the name of every static library. Defaults to ".a".
1295 pub staticlib_suffix: StaticCow<str>,
1296 /// Values of the `target_family` cfg set for this target.
1298 /// Common options are: "unix", "windows". Defaults to no families.
1300 /// See <https://doc.rust-lang.org/reference/conditional-compilation.html#target_family>.
1301 pub families: StaticCow<[StaticCow<str>]>,
1302 /// Whether the target toolchain's ABI supports returning small structs as an integer.
1303 pub abi_return_struct_as_int: bool,
1304 /// Whether the target toolchain is like macOS's. Only useful for compiling against iOS/macOS,
1305 /// in particular running dsymutil and some other stuff like `-dead_strip`. Defaults to false.
1306 pub is_like_osx: bool,
1307 /// Whether the target toolchain is like Solaris's.
1308 /// Only useful for compiling against Illumos/Solaris,
1309 /// as they have a different set of linker flags. Defaults to false.
1310 pub is_like_solaris: bool,
1311 /// Whether the target is like Windows.
1312 /// This is a combination of several more specific properties represented as a single flag:
1313 /// - The target uses a Windows ABI,
1314 /// - uses PE/COFF as a format for object code,
1315 /// - uses Windows-style dllexport/dllimport for shared libraries,
1316 /// - uses import libraries and .def files for symbol exports,
1317 /// - executables support setting a subsystem.
1318 pub is_like_windows: bool,
1319 /// Whether the target is like MSVC.
1320 /// This is a combination of several more specific properties represented as a single flag:
1321 /// - The target has all the properties from `is_like_windows`
1322 /// (for in-tree targets "is_like_msvc ⇒ is_like_windows" is ensured by a unit test),
1323 /// - has some MSVC-specific Windows ABI properties,
1324 /// - uses a link.exe-like linker,
1325 /// - uses CodeView/PDB for debuginfo and natvis for its visualization,
1326 /// - uses SEH-based unwinding,
1327 /// - supports control flow guard mechanism.
1328 pub is_like_msvc: bool,
1329 /// Whether a target toolchain is like WASM.
1330 pub is_like_wasm: bool,
1331 /// Default supported version of DWARF on this platform.
1332 /// Useful because some platforms (osx, bsd) only want up to DWARF2.
1333 pub default_dwarf_version: u32,
1334 /// Whether the linker support GNU-like arguments such as -O. Defaults to true.
1335 pub linker_is_gnu: bool,
1336 /// The MinGW toolchain has a known issue that prevents it from correctly
1337 /// handling COFF object files with more than 2<sup>15</sup> sections. Since each weak
1338 /// symbol needs its own COMDAT section, weak linkage implies a large
1339 /// number sections that easily exceeds the given limit for larger
1340 /// codebases. Consequently we want a way to disallow weak linkage on some
1342 pub allows_weak_linkage: bool,
1343 /// Whether the linker support rpaths or not. Defaults to false.
1344 pub has_rpath: bool,
1345 /// Whether to disable linking to the default libraries, typically corresponds
1346 /// to `-nodefaultlibs`. Defaults to true.
1347 pub no_default_libraries: bool,
1348 /// Dynamically linked executables can be compiled as position independent
1349 /// if the default relocation model of position independent code is not
1350 /// changed. This is a requirement to take advantage of ASLR, as otherwise
1351 /// the functions in the executable are not randomized and can be used
1352 /// during an exploit of a vulnerability in any code.
1353 pub position_independent_executables: bool,
1354 /// Executables that are both statically linked and position-independent are supported.
1355 pub static_position_independent_executables: bool,
1356 /// Determines if the target always requires using the PLT for indirect
1357 /// library calls or not. This controls the default value of the `-Z plt` flag.
1358 pub needs_plt: bool,
1359 /// Either partial, full, or off. Full RELRO makes the dynamic linker
1360 /// resolve all symbols at startup and marks the GOT read-only before
1361 /// starting the program, preventing overwriting the GOT.
1362 pub relro_level: RelroLevel,
1363 /// Format that archives should be emitted in. This affects whether we use
1364 /// LLVM to assemble an archive or fall back to the system linker, and
1365 /// currently only "gnu" is used to fall into LLVM. Unknown strings cause
1366 /// the system linker to be used.
1367 pub archive_format: StaticCow<str>,
1368 /// Is asm!() allowed? Defaults to true.
1369 pub allow_asm: bool,
1370 /// Whether the runtime startup code requires the `main` function be passed
1371 /// `argc` and `argv` values.
1372 pub main_needs_argc_argv: bool,
1374 /// Flag indicating whether #[thread_local] is available for this target.
1375 pub has_thread_local: bool,
1376 // This is mainly for easy compatibility with emscripten.
1377 // If we give emcc .o files that are actually .bc files it
1378 // will 'just work'.
1379 pub obj_is_bitcode: bool,
1380 /// Whether the target requires that emitted object code includes bitcode.
1381 pub forces_embed_bitcode: bool,
1382 /// Content of the LLVM cmdline section associated with embedded bitcode.
1383 pub bitcode_llvm_cmdline: StaticCow<str>,
1385 /// Don't use this field; instead use the `.min_atomic_width()` method.
1386 pub min_atomic_width: Option<u64>,
1388 /// Don't use this field; instead use the `.max_atomic_width()` method.
1389 pub max_atomic_width: Option<u64>,
1391 /// Whether the target supports atomic CAS operations natively
1392 pub atomic_cas: bool,
1394 /// Panic strategy: "unwind" or "abort"
1395 pub panic_strategy: PanicStrategy,
1397 /// Whether or not linking dylibs to a static CRT is allowed.
1398 pub crt_static_allows_dylibs: bool,
1399 /// Whether or not the CRT is statically linked by default.
1400 pub crt_static_default: bool,
1401 /// Whether or not crt-static is respected by the compiler (or is a no-op).
1402 pub crt_static_respected: bool,
1404 /// The implementation of stack probes to use.
1405 pub stack_probes: StackProbeType,
1407 /// The minimum alignment for global symbols.
1408 pub min_global_align: Option<u64>,
1410 /// Default number of codegen units to use in debug mode
1411 pub default_codegen_units: Option<u64>,
1413 /// Whether to generate trap instructions in places where optimization would
1414 /// otherwise produce control flow that falls through into unrelated memory.
1415 pub trap_unreachable: bool,
1417 /// This target requires everything to be compiled with LTO to emit a final
1418 /// executable, aka there is no native linker for this target.
1419 pub requires_lto: bool,
1421 /// This target has no support for threads.
1422 pub singlethread: bool,
1424 /// Whether library functions call lowering/optimization is disabled in LLVM
1425 /// for this target unconditionally.
1426 pub no_builtins: bool,
1428 /// The default visibility for symbols in this target should be "hidden"
1429 /// rather than "default"
1430 pub default_hidden_visibility: bool,
1432 /// Whether a .debug_gdb_scripts section will be added to the output object file
1433 pub emit_debug_gdb_scripts: bool,
1435 /// Whether or not to unconditionally `uwtable` attributes on functions,
1436 /// typically because the platform needs to unwind for things like stack
1438 pub requires_uwtable: bool,
1440 /// Whether or not to emit `uwtable` attributes on functions if `-C force-unwind-tables`
1441 /// is not specified and `uwtable` is not required on this target.
1442 pub default_uwtable: bool,
1444 /// Whether or not SIMD types are passed by reference in the Rust ABI,
1445 /// typically required if a target can be compiled with a mixed set of
1446 /// target features. This is `true` by default, and `false` for targets like
1447 /// wasm32 where the whole program either has simd or not.
1448 pub simd_types_indirect: bool,
1450 /// Pass a list of symbol which should be exported in the dylib to the linker.
1451 pub limit_rdylib_exports: bool,
1453 /// If set, have the linker export exactly these symbols, instead of using
1454 /// the usual logic to figure this out from the crate itself.
1455 pub override_export_symbols: Option<StaticCow<[StaticCow<str>]>>,
1457 /// Determines how or whether the MergeFunctions LLVM pass should run for
1458 /// this target. Either "disabled", "trampolines", or "aliases".
1459 /// The MergeFunctions pass is generally useful, but some targets may need
1460 /// to opt out. The default is "aliases".
1462 /// Workaround for: <https://github.com/rust-lang/rust/issues/57356>
1463 pub merge_functions: MergeFunctions,
1465 /// Use platform dependent mcount function
1466 pub mcount: StaticCow<str>,
1468 /// LLVM ABI name, corresponds to the '-mabi' parameter available in multilib C compilers
1469 pub llvm_abiname: StaticCow<str>,
1471 /// Whether or not RelaxElfRelocation flag will be passed to the linker
1472 pub relax_elf_relocations: bool,
1474 /// Additional arguments to pass to LLVM, similar to the `-C llvm-args` codegen option.
1475 pub llvm_args: StaticCow<[StaticCow<str>]>,
1477 /// Whether to use legacy .ctors initialization hooks rather than .init_array. Defaults
1478 /// to false (uses .init_array).
1479 pub use_ctors_section: bool,
1481 /// Whether the linker is instructed to add a `GNU_EH_FRAME` ELF header
1482 /// used to locate unwinding information is passed
1483 /// (only has effect if the linker is `ld`-like).
1484 pub eh_frame_header: bool,
1486 /// Is true if the target is an ARM architecture using thumb v1 which allows for
1487 /// thumb and arm interworking.
1488 pub has_thumb_interworking: bool,
1490 /// Which kind of debuginfo is used by this target?
1491 pub debuginfo_kind: DebuginfoKind,
1492 /// How to handle split debug information, if at all. Specifying `None` has
1493 /// target-specific meaning.
1494 pub split_debuginfo: SplitDebuginfo,
1495 /// Which kinds of split debuginfo are supported by the target?
1496 pub supported_split_debuginfo: StaticCow<[SplitDebuginfo]>,
1498 /// The sanitizers supported by this target
1500 /// Note that the support here is at a codegen level. If the machine code with sanitizer
1501 /// enabled can generated on this target, but the necessary supporting libraries are not
1502 /// distributed with the target, the sanitizer should still appear in this list for the target.
1503 pub supported_sanitizers: SanitizerSet,
1505 /// If present it's a default value to use for adjusting the C ABI.
1506 pub default_adjusted_cabi: Option<Abi>,
1508 /// Minimum number of bits in #[repr(C)] enum. Defaults to 32.
1509 pub c_enum_min_bits: u64,
1511 /// Whether or not the DWARF `.debug_aranges` section should be generated.
1512 pub generate_arange_section: bool,
1514 /// Whether the target supports stack canary checks. `true` by default,
1515 /// since this is most common among tier 1 and tier 2 targets.
1516 pub supports_stack_protector: bool,
1519 /// Add arguments for the given flavor and also for its "twin" flavors
1520 /// that have a compatible command line interface.
1521 fn add_link_args(link_args: &mut LinkArgs, flavor: LinkerFlavor, args: &[&'static str]) {
1522 let mut insert = |flavor| {
1523 link_args.entry(flavor).or_default().extend(args.iter().copied().map(Cow::Borrowed))
1527 LinkerFlavor::Ld => insert(LinkerFlavor::Lld(LldFlavor::Ld)),
1528 LinkerFlavor::Msvc => insert(LinkerFlavor::Lld(LldFlavor::Link)),
1529 LinkerFlavor::Lld(LldFlavor::Ld64) | LinkerFlavor::Lld(LldFlavor::Wasm) => {}
1530 LinkerFlavor::Lld(lld_flavor) => {
1531 panic!("add_link_args: use non-LLD flavor for {:?}", lld_flavor)
1535 | LinkerFlavor::L4Bender
1536 | LinkerFlavor::BpfLinker
1537 | LinkerFlavor::PtxLinker => {}
1541 impl TargetOptions {
1542 fn link_args(flavor: LinkerFlavor, args: &[&'static str]) -> LinkArgs {
1543 let mut link_args = LinkArgs::new();
1544 add_link_args(&mut link_args, flavor, args);
1548 fn add_pre_link_args(&mut self, flavor: LinkerFlavor, args: &[&'static str]) {
1549 add_link_args(&mut self.pre_link_args, flavor, args);
1552 fn add_post_link_args(&mut self, flavor: LinkerFlavor, args: &[&'static str]) {
1553 add_link_args(&mut self.post_link_args, flavor, args);
1557 impl Default for TargetOptions {
1558 /// Creates a set of "sane defaults" for any target. This is still
1559 /// incomplete, and if used for compilation, will certainly not work.
1560 fn default() -> TargetOptions {
1563 endian: Endian::Little,
1564 c_int_width: "32".into(),
1568 vendor: "unknown".into(),
1569 linker_flavor: LinkerFlavor::Gcc,
1570 linker: option_env!("CFG_DEFAULT_LINKER").map(|s| s.into()),
1571 lld_flavor: LldFlavor::Ld,
1572 pre_link_args: LinkArgs::new(),
1573 post_link_args: LinkArgs::new(),
1576 cpu: "generic".into(),
1577 features: "".into(),
1578 dynamic_linking: false,
1581 relocation_model: RelocModel::Pic,
1583 tls_model: TlsModel::GeneralDynamic,
1584 disable_redzone: false,
1585 frame_pointer: FramePointer::MayOmit,
1586 function_sections: true,
1587 dll_prefix: "lib".into(),
1588 dll_suffix: ".so".into(),
1589 exe_suffix: "".into(),
1590 staticlib_prefix: "lib".into(),
1591 staticlib_suffix: ".a".into(),
1593 abi_return_struct_as_int: false,
1595 is_like_solaris: false,
1596 is_like_windows: false,
1597 is_like_msvc: false,
1598 is_like_wasm: false,
1599 default_dwarf_version: 4,
1600 linker_is_gnu: true,
1601 allows_weak_linkage: true,
1603 no_default_libraries: true,
1604 position_independent_executables: false,
1605 static_position_independent_executables: false,
1607 relro_level: RelroLevel::None,
1608 pre_link_objects: Default::default(),
1609 post_link_objects: Default::default(),
1610 pre_link_objects_self_contained: Default::default(),
1611 post_link_objects_self_contained: Default::default(),
1612 link_self_contained: LinkSelfContainedDefault::False,
1613 late_link_args: LinkArgs::new(),
1614 late_link_args_dynamic: LinkArgs::new(),
1615 late_link_args_static: LinkArgs::new(),
1617 link_env_remove: cvs![],
1618 archive_format: "gnu".into(),
1619 main_needs_argc_argv: true,
1621 has_thread_local: false,
1622 obj_is_bitcode: false,
1623 forces_embed_bitcode: false,
1624 bitcode_llvm_cmdline: "".into(),
1625 min_atomic_width: None,
1626 max_atomic_width: None,
1628 panic_strategy: PanicStrategy::Unwind,
1629 crt_static_allows_dylibs: false,
1630 crt_static_default: false,
1631 crt_static_respected: false,
1632 stack_probes: StackProbeType::None,
1633 min_global_align: None,
1634 default_codegen_units: None,
1635 trap_unreachable: true,
1636 requires_lto: false,
1637 singlethread: false,
1639 default_hidden_visibility: false,
1640 emit_debug_gdb_scripts: true,
1641 requires_uwtable: false,
1642 default_uwtable: false,
1643 simd_types_indirect: true,
1644 limit_rdylib_exports: true,
1645 override_export_symbols: None,
1646 merge_functions: MergeFunctions::Aliases,
1647 mcount: "mcount".into(),
1648 llvm_abiname: "".into(),
1649 relax_elf_relocations: false,
1651 use_ctors_section: false,
1652 eh_frame_header: true,
1653 has_thumb_interworking: false,
1654 debuginfo_kind: Default::default(),
1655 split_debuginfo: Default::default(),
1656 // `Off` is supported by default, but targets can remove this manually, e.g. Windows.
1657 supported_split_debuginfo: Cow::Borrowed(&[SplitDebuginfo::Off]),
1658 supported_sanitizers: SanitizerSet::empty(),
1659 default_adjusted_cabi: None,
1660 c_enum_min_bits: 32,
1661 generate_arange_section: true,
1662 supports_stack_protector: true,
1667 /// `TargetOptions` being a separate type is basically an implementation detail of `Target` that is
1668 /// used for providing defaults. Perhaps there's a way to merge `TargetOptions` into `Target` so
1669 /// this `Deref` implementation is no longer necessary.
1670 impl Deref for Target {
1671 type Target = TargetOptions;
1674 fn deref(&self) -> &Self::Target {
1678 impl DerefMut for Target {
1680 fn deref_mut(&mut self) -> &mut Self::Target {
1686 /// Given a function ABI, turn it into the correct ABI for this target.
1687 pub fn adjust_abi(&self, abi: Abi) -> Abi {
1689 Abi::C { .. } => self.default_adjusted_cabi.unwrap_or(abi),
1690 Abi::System { unwind } if self.is_like_windows && self.arch == "x86" => {
1691 Abi::Stdcall { unwind }
1693 Abi::System { unwind } => Abi::C { unwind },
1694 Abi::EfiApi if self.arch == "x86_64" => Abi::Win64 { unwind: false },
1695 Abi::EfiApi => Abi::C { unwind: false },
1697 // See commentary in `is_abi_supported`.
1698 Abi::Stdcall { .. } | Abi::Thiscall { .. } if self.arch == "x86" => abi,
1699 Abi::Stdcall { unwind } | Abi::Thiscall { unwind } => Abi::C { unwind },
1700 Abi::Fastcall { .. } if self.arch == "x86" => abi,
1701 Abi::Vectorcall { .. } if ["x86", "x86_64"].contains(&&self.arch[..]) => abi,
1702 Abi::Fastcall { unwind } | Abi::Vectorcall { unwind } => Abi::C { unwind },
1708 /// Returns a None if the UNSUPPORTED_CALLING_CONVENTIONS lint should be emitted
1709 pub fn is_abi_supported(&self, abi: Abi) -> Option<bool> {
1722 X86Interrupt => ["x86", "x86_64"].contains(&&self.arch[..]),
1723 Aapcs { .. } => "arm" == self.arch,
1724 CCmseNonSecureCall => ["arm", "aarch64"].contains(&&self.arch[..]),
1725 Win64 { .. } | SysV64 { .. } => self.arch == "x86_64",
1726 PtxKernel => self.arch == "nvptx64",
1727 Msp430Interrupt => self.arch == "msp430",
1728 AmdGpuKernel => self.arch == "amdgcn",
1729 AvrInterrupt | AvrNonBlockingInterrupt => self.arch == "avr",
1730 Wasm => ["wasm32", "wasm64"].contains(&&self.arch[..]),
1731 Thiscall { .. } => self.arch == "x86",
1732 // On windows these fall-back to platform native calling convention (C) when the
1733 // architecture is not supported.
1735 // This is I believe a historical accident that has occurred as part of Microsoft
1736 // striving to allow most of the code to "just" compile when support for 64-bit x86
1737 // was added and then later again, when support for ARM architectures was added.
1739 // This is well documented across MSDN. Support for this in Rust has been added in
1740 // #54576. This makes much more sense in context of Microsoft's C++ than it does in
1741 // Rust, but there isn't much leeway remaining here to change it back at the time this
1742 // comment has been written.
1744 // Following are the relevant excerpts from the MSDN documentation.
1746 // > The __vectorcall calling convention is only supported in native code on x86 and
1747 // x64 processors that include Streaming SIMD Extensions 2 (SSE2) and above.
1749 // > On ARM machines, __vectorcall is accepted and ignored by the compiler.
1751 // -- https://docs.microsoft.com/en-us/cpp/cpp/vectorcall?view=msvc-160
1753 // > On ARM and x64 processors, __stdcall is accepted and ignored by the compiler;
1755 // -- https://docs.microsoft.com/en-us/cpp/cpp/stdcall?view=msvc-160
1757 // > In most cases, keywords or compiler switches that specify an unsupported
1758 // > convention on a particular platform are ignored, and the platform default
1759 // > convention is used.
1761 // -- https://docs.microsoft.com/en-us/cpp/cpp/argument-passing-and-naming-conventions
1762 Stdcall { .. } | Fastcall { .. } | Vectorcall { .. } if self.is_like_windows => true,
1763 // Outside of Windows we want to only support these calling conventions for the
1764 // architectures for which these calling conventions are actually well defined.
1765 Stdcall { .. } | Fastcall { .. } if self.arch == "x86" => true,
1766 Vectorcall { .. } if ["x86", "x86_64"].contains(&&self.arch[..]) => true,
1767 // Return a `None` for other cases so that we know to emit a future compat lint.
1768 Stdcall { .. } | Fastcall { .. } | Vectorcall { .. } => return None,
1772 /// Minimum integer size in bits that this target can perform atomic
1774 pub fn min_atomic_width(&self) -> u64 {
1775 self.min_atomic_width.unwrap_or(8)
1778 /// Maximum integer size in bits that this target can perform atomic
1780 pub fn max_atomic_width(&self) -> u64 {
1781 self.max_atomic_width.unwrap_or_else(|| self.pointer_width.into())
1784 /// Loads a target descriptor from a JSON object.
1785 pub fn from_json(obj: Json) -> Result<(Target, TargetWarnings), String> {
1786 // While ugly, this code must remain this way to retain
1787 // compatibility with existing JSON fields and the internal
1788 // expected naming of the Target and TargetOptions structs.
1789 // To ensure compatibility is retained, the built-in targets
1790 // are round-tripped through this code to catch cases where
1791 // the JSON parser is not updated to match the structs.
1793 let mut obj = match obj {
1794 Value::Object(obj) => obj,
1795 _ => return Err("Expected JSON object for target")?,
1798 let mut get_req_field = |name: &str| {
1800 .and_then(|j| j.as_str().map(str::to_string))
1801 .ok_or_else(|| format!("Field {} in target specification is required", name))
1804 let mut base = Target {
1805 llvm_target: get_req_field("llvm-target")?.into(),
1806 pointer_width: get_req_field("target-pointer-width")?
1808 .map_err(|_| "target-pointer-width must be an integer".to_string())?,
1809 data_layout: get_req_field("data-layout")?.into(),
1810 arch: get_req_field("arch")?.into(),
1811 options: Default::default(),
1814 let mut incorrect_type = vec![];
1817 ($key_name:ident) => ( {
1818 let name = (stringify!($key_name)).replace("_", "-");
1819 if let Some(s) = obj.remove(&name).and_then(|s| s.as_str().map(str::to_string).map(Cow::from)) {
1823 ($key_name:ident = $json_name:expr) => ( {
1824 let name = $json_name;
1825 if let Some(s) = obj.remove(name).and_then(|s| s.as_str().map(str::to_string).map(Cow::from)) {
1829 ($key_name:ident, bool) => ( {
1830 let name = (stringify!($key_name)).replace("_", "-");
1831 if let Some(s) = obj.remove(&name).and_then(|b| b.as_bool()) {
1835 ($key_name:ident, u64) => ( {
1836 let name = (stringify!($key_name)).replace("_", "-");
1837 if let Some(s) = obj.remove(&name).and_then(|j| Json::as_u64(&j)) {
1841 ($key_name:ident, u32) => ( {
1842 let name = (stringify!($key_name)).replace("_", "-");
1843 if let Some(s) = obj.remove(&name).and_then(|b| b.as_u64()) {
1845 return Err("Not a valid DWARF version number".into());
1847 base.$key_name = s as u32;
1850 ($key_name:ident, Option<u64>) => ( {
1851 let name = (stringify!($key_name)).replace("_", "-");
1852 if let Some(s) = obj.remove(&name).and_then(|b| b.as_u64()) {
1853 base.$key_name = Some(s);
1856 ($key_name:ident, MergeFunctions) => ( {
1857 let name = (stringify!($key_name)).replace("_", "-");
1858 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
1859 match s.parse::<MergeFunctions>() {
1860 Ok(mergefunc) => base.$key_name = mergefunc,
1861 _ => return Some(Err(format!("'{}' is not a valid value for \
1862 merge-functions. Use 'disabled', \
1863 'trampolines', or 'aliases'.",
1867 })).unwrap_or(Ok(()))
1869 ($key_name:ident, RelocModel) => ( {
1870 let name = (stringify!($key_name)).replace("_", "-");
1871 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
1872 match s.parse::<RelocModel>() {
1873 Ok(relocation_model) => base.$key_name = relocation_model,
1874 _ => return Some(Err(format!("'{}' is not a valid relocation model. \
1875 Run `rustc --print relocation-models` to \
1876 see the list of supported values.", s))),
1879 })).unwrap_or(Ok(()))
1881 ($key_name:ident, CodeModel) => ( {
1882 let name = (stringify!($key_name)).replace("_", "-");
1883 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
1884 match s.parse::<CodeModel>() {
1885 Ok(code_model) => base.$key_name = Some(code_model),
1886 _ => return Some(Err(format!("'{}' is not a valid code model. \
1887 Run `rustc --print code-models` to \
1888 see the list of supported values.", s))),
1891 })).unwrap_or(Ok(()))
1893 ($key_name:ident, TlsModel) => ( {
1894 let name = (stringify!($key_name)).replace("_", "-");
1895 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
1896 match s.parse::<TlsModel>() {
1897 Ok(tls_model) => base.$key_name = tls_model,
1898 _ => return Some(Err(format!("'{}' is not a valid TLS model. \
1899 Run `rustc --print tls-models` to \
1900 see the list of supported values.", s))),
1903 })).unwrap_or(Ok(()))
1905 ($key_name:ident, PanicStrategy) => ( {
1906 let name = (stringify!($key_name)).replace("_", "-");
1907 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
1909 "unwind" => base.$key_name = PanicStrategy::Unwind,
1910 "abort" => base.$key_name = PanicStrategy::Abort,
1911 _ => return Some(Err(format!("'{}' is not a valid value for \
1912 panic-strategy. Use 'unwind' or 'abort'.",
1916 })).unwrap_or(Ok(()))
1918 ($key_name:ident, RelroLevel) => ( {
1919 let name = (stringify!($key_name)).replace("_", "-");
1920 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
1921 match s.parse::<RelroLevel>() {
1922 Ok(level) => base.$key_name = level,
1923 _ => return Some(Err(format!("'{}' is not a valid value for \
1924 relro-level. Use 'full', 'partial, or 'off'.",
1928 })).unwrap_or(Ok(()))
1930 ($key_name:ident, DebuginfoKind) => ( {
1931 let name = (stringify!($key_name)).replace("_", "-");
1932 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
1933 match s.parse::<DebuginfoKind>() {
1934 Ok(level) => base.$key_name = level,
1935 _ => return Some(Err(
1936 format!("'{s}' is not a valid value for debuginfo-kind. Use 'dwarf', \
1937 'dwarf-dsym' or 'pdb'.")
1941 })).unwrap_or(Ok(()))
1943 ($key_name:ident, SplitDebuginfo) => ( {
1944 let name = (stringify!($key_name)).replace("_", "-");
1945 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
1946 match s.parse::<SplitDebuginfo>() {
1947 Ok(level) => base.$key_name = level,
1948 _ => return Some(Err(format!("'{}' is not a valid value for \
1949 split-debuginfo. Use 'off' or 'dsymutil'.",
1953 })).unwrap_or(Ok(()))
1955 ($key_name:ident, list) => ( {
1956 let name = (stringify!($key_name)).replace("_", "-");
1957 if let Some(j) = obj.remove(&name) {
1958 if let Some(v) = j.as_array() {
1959 base.$key_name = v.iter()
1960 .map(|a| a.as_str().unwrap().to_string().into())
1963 incorrect_type.push(name)
1967 ($key_name:ident, opt_list) => ( {
1968 let name = (stringify!($key_name)).replace("_", "-");
1969 if let Some(j) = obj.remove(&name) {
1970 if let Some(v) = j.as_array() {
1971 base.$key_name = Some(v.iter()
1972 .map(|a| a.as_str().unwrap().to_string().into())
1975 incorrect_type.push(name)
1979 ($key_name:ident, falliable_list) => ( {
1980 let name = (stringify!($key_name)).replace("_", "-");
1981 obj.remove(&name).and_then(|j| {
1982 if let Some(v) = j.as_array() {
1983 match v.iter().map(|a| FromStr::from_str(a.as_str().unwrap())).collect() {
1984 Ok(l) => { base.$key_name = l },
1985 // FIXME: `falliable_list` can't re-use the `key!` macro for list
1986 // elements and the error messages from that macro, so it has a bad
1987 // generic message instead
1988 Err(_) => return Some(Err(
1989 format!("`{:?}` is not a valid value for `{}`", j, name)
1993 incorrect_type.push(name)
1996 }).unwrap_or(Ok(()))
1998 ($key_name:ident, optional) => ( {
1999 let name = (stringify!($key_name)).replace("_", "-");
2000 if let Some(o) = obj.remove(&name) {
2003 .map(|s| s.to_string().into());
2006 ($key_name:ident, LldFlavor) => ( {
2007 let name = (stringify!($key_name)).replace("_", "-");
2008 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
2009 if let Some(flavor) = LldFlavor::from_str(&s) {
2010 base.$key_name = flavor;
2012 return Some(Err(format!(
2013 "'{}' is not a valid value for lld-flavor. \
2014 Use 'darwin', 'gnu', 'link' or 'wasm.",
2018 })).unwrap_or(Ok(()))
2020 ($key_name:ident, LinkerFlavor) => ( {
2021 let name = (stringify!($key_name)).replace("_", "-");
2022 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
2023 match LinkerFlavor::from_str(s) {
2024 Some(linker_flavor) => base.$key_name = linker_flavor,
2025 _ => return Some(Err(format!("'{}' is not a valid value for linker-flavor. \
2026 Use {}", s, LinkerFlavor::one_of()))),
2029 })).unwrap_or(Ok(()))
2031 ($key_name:ident, StackProbeType) => ( {
2032 let name = (stringify!($key_name)).replace("_", "-");
2033 obj.remove(&name).and_then(|o| match StackProbeType::from_json(&o) {
2039 format!("`{:?}` is not a valid value for `{}`: {}", o, name, s)
2041 }).unwrap_or(Ok(()))
2043 ($key_name:ident, SanitizerSet) => ( {
2044 let name = (stringify!($key_name)).replace("_", "-");
2045 if let Some(o) = obj.remove(&name) {
2046 if let Some(a) = o.as_array() {
2048 base.$key_name |= match s.as_str() {
2049 Some("address") => SanitizerSet::ADDRESS,
2050 Some("cfi") => SanitizerSet::CFI,
2051 Some("leak") => SanitizerSet::LEAK,
2052 Some("memory") => SanitizerSet::MEMORY,
2053 Some("memtag") => SanitizerSet::MEMTAG,
2054 Some("shadow-call-stack") => SanitizerSet::SHADOWCALLSTACK,
2055 Some("thread") => SanitizerSet::THREAD,
2056 Some("hwaddress") => SanitizerSet::HWADDRESS,
2057 Some(s) => return Err(format!("unknown sanitizer {}", s)),
2058 _ => return Err(format!("not a string: {:?}", s)),
2062 incorrect_type.push(name)
2065 Ok::<(), String>(())
2068 ($key_name:ident = $json_name:expr, link_self_contained) => ( {
2069 let name = $json_name;
2070 obj.remove(name).and_then(|o| o.as_str().and_then(|s| {
2071 match s.parse::<LinkSelfContainedDefault>() {
2072 Ok(lsc_default) => base.$key_name = lsc_default,
2073 _ => return Some(Err(format!("'{}' is not a valid `-Clink-self-contained` default. \
2074 Use 'false', 'true', 'musl' or 'mingw'", s))),
2077 })).unwrap_or(Ok(()))
2079 ($key_name:ident = $json_name:expr, link_objects) => ( {
2080 let name = $json_name;
2081 if let Some(val) = obj.remove(name) {
2082 let obj = val.as_object().ok_or_else(|| format!("{}: expected a \
2083 JSON object with fields per CRT object kind.", name))?;
2084 let mut args = CrtObjects::new();
2086 let kind = LinkOutputKind::from_str(&k).ok_or_else(|| {
2087 format!("{}: '{}' is not a valid value for CRT object kind. \
2088 Use '(dynamic,static)-(nopic,pic)-exe' or \
2089 '(dynamic,static)-dylib' or 'wasi-reactor-exe'", name, k)
2092 let v = v.as_array().ok_or_else(||
2093 format!("{}.{}: expected a JSON array", name, k)
2094 )?.iter().enumerate()
2096 let s = s.as_str().ok_or_else(||
2097 format!("{}.{}[{}]: expected a JSON string", name, k, i))?;
2098 Ok(s.to_string().into())
2100 .collect::<Result<Vec<_>, String>>()?;
2102 args.insert(kind, v);
2104 base.$key_name = args;
2107 ($key_name:ident, link_args) => ( {
2108 let name = (stringify!($key_name)).replace("_", "-");
2109 if let Some(val) = obj.remove(&name) {
2110 let obj = val.as_object().ok_or_else(|| format!("{}: expected a \
2111 JSON object with fields per linker-flavor.", name))?;
2112 let mut args = LinkArgs::new();
2114 let flavor = LinkerFlavor::from_str(&k).ok_or_else(|| {
2115 format!("{}: '{}' is not a valid value for linker-flavor. \
2116 Use 'em', 'gcc', 'ld' or 'msvc'", name, k)
2119 let v = v.as_array().ok_or_else(||
2120 format!("{}.{}: expected a JSON array", name, k)
2121 )?.iter().enumerate()
2123 let s = s.as_str().ok_or_else(||
2124 format!("{}.{}[{}]: expected a JSON string", name, k, i))?;
2125 Ok(s.to_string().into())
2127 .collect::<Result<Vec<_>, String>>()?;
2129 args.insert(flavor, v);
2131 base.$key_name = args;
2134 ($key_name:ident, env) => ( {
2135 let name = (stringify!($key_name)).replace("_", "-");
2136 if let Some(o) = obj.remove(&name) {
2137 if let Some(a) = o.as_array() {
2139 if let Some(s) = o.as_str() {
2140 let p = s.split('=').collect::<Vec<_>>();
2142 let k = p[0].to_string();
2143 let v = p[1].to_string();
2144 base.$key_name.to_mut().push((k.into(), v.into()));
2149 incorrect_type.push(name)
2153 ($key_name:ident, Option<Abi>) => ( {
2154 let name = (stringify!($key_name)).replace("_", "-");
2155 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
2156 match lookup_abi(s) {
2157 Some(abi) => base.$key_name = Some(abi),
2158 _ => return Some(Err(format!("'{}' is not a valid value for abi", s))),
2161 })).unwrap_or(Ok(()))
2163 ($key_name:ident, TargetFamilies) => ( {
2164 if let Some(value) = obj.remove("target-family") {
2165 if let Some(v) = value.as_array() {
2166 base.$key_name = v.iter()
2167 .map(|a| a.as_str().unwrap().to_string().into())
2169 } else if let Some(v) = value.as_str() {
2170 base.$key_name = vec![v.to_string().into()].into();
2176 if let Some(j) = obj.remove("target-endian") {
2177 if let Some(s) = j.as_str() {
2178 base.endian = s.parse()?;
2180 incorrect_type.push("target-endian".into())
2184 if let Some(fp) = obj.remove("frame-pointer") {
2185 if let Some(s) = fp.as_str() {
2186 base.frame_pointer = s
2188 .map_err(|()| format!("'{}' is not a valid value for frame-pointer", s))?;
2190 incorrect_type.push("frame-pointer".into())
2194 key!(is_builtin, bool);
2195 key!(c_int_width = "target-c-int-width");
2200 key!(linker_flavor, LinkerFlavor)?;
2201 key!(linker, optional);
2202 key!(lld_flavor, LldFlavor)?;
2203 key!(pre_link_objects = "pre-link-objects", link_objects);
2204 key!(post_link_objects = "post-link-objects", link_objects);
2205 key!(pre_link_objects_self_contained = "pre-link-objects-fallback", link_objects);
2206 key!(post_link_objects_self_contained = "post-link-objects-fallback", link_objects);
2207 key!(link_self_contained = "crt-objects-fallback", link_self_contained)?;
2208 key!(pre_link_args, link_args);
2209 key!(late_link_args, link_args);
2210 key!(late_link_args_dynamic, link_args);
2211 key!(late_link_args_static, link_args);
2212 key!(post_link_args, link_args);
2213 key!(link_script, optional);
2214 key!(link_env, env);
2215 key!(link_env_remove, list);
2216 key!(asm_args, list);
2219 key!(dynamic_linking, bool);
2220 key!(only_cdylib, bool);
2221 key!(executables, bool);
2222 key!(relocation_model, RelocModel)?;
2223 key!(code_model, CodeModel)?;
2224 key!(tls_model, TlsModel)?;
2225 key!(disable_redzone, bool);
2226 key!(function_sections, bool);
2230 key!(staticlib_prefix);
2231 key!(staticlib_suffix);
2232 key!(families, TargetFamilies);
2233 key!(abi_return_struct_as_int, bool);
2234 key!(is_like_osx, bool);
2235 key!(is_like_solaris, bool);
2236 key!(is_like_windows, bool);
2237 key!(is_like_msvc, bool);
2238 key!(is_like_wasm, bool);
2239 key!(default_dwarf_version, u32);
2240 key!(linker_is_gnu, bool);
2241 key!(allows_weak_linkage, bool);
2242 key!(has_rpath, bool);
2243 key!(no_default_libraries, bool);
2244 key!(position_independent_executables, bool);
2245 key!(static_position_independent_executables, bool);
2246 key!(needs_plt, bool);
2247 key!(relro_level, RelroLevel)?;
2248 key!(archive_format);
2249 key!(allow_asm, bool);
2250 key!(main_needs_argc_argv, bool);
2251 key!(has_thread_local, bool);
2252 key!(obj_is_bitcode, bool);
2253 key!(forces_embed_bitcode, bool);
2254 key!(bitcode_llvm_cmdline);
2255 key!(max_atomic_width, Option<u64>);
2256 key!(min_atomic_width, Option<u64>);
2257 key!(atomic_cas, bool);
2258 key!(panic_strategy, PanicStrategy)?;
2259 key!(crt_static_allows_dylibs, bool);
2260 key!(crt_static_default, bool);
2261 key!(crt_static_respected, bool);
2262 key!(stack_probes, StackProbeType)?;
2263 key!(min_global_align, Option<u64>);
2264 key!(default_codegen_units, Option<u64>);
2265 key!(trap_unreachable, bool);
2266 key!(requires_lto, bool);
2267 key!(singlethread, bool);
2268 key!(no_builtins, bool);
2269 key!(default_hidden_visibility, bool);
2270 key!(emit_debug_gdb_scripts, bool);
2271 key!(requires_uwtable, bool);
2272 key!(default_uwtable, bool);
2273 key!(simd_types_indirect, bool);
2274 key!(limit_rdylib_exports, bool);
2275 key!(override_export_symbols, opt_list);
2276 key!(merge_functions, MergeFunctions)?;
2277 key!(mcount = "target-mcount");
2279 key!(relax_elf_relocations, bool);
2280 key!(llvm_args, list);
2281 key!(use_ctors_section, bool);
2282 key!(eh_frame_header, bool);
2283 key!(has_thumb_interworking, bool);
2284 key!(debuginfo_kind, DebuginfoKind)?;
2285 key!(split_debuginfo, SplitDebuginfo)?;
2286 key!(supported_split_debuginfo, falliable_list)?;
2287 key!(supported_sanitizers, SanitizerSet)?;
2288 key!(default_adjusted_cabi, Option<Abi>)?;
2289 key!(c_enum_min_bits, u64);
2290 key!(generate_arange_section, bool);
2291 key!(supports_stack_protector, bool);
2293 if base.is_builtin {
2294 // This can cause unfortunate ICEs later down the line.
2295 return Err("may not set is_builtin for targets not built-in".into());
2297 // Each field should have been read using `Json::remove` so any keys remaining are unused.
2298 let remaining_keys = obj.keys();
2301 TargetWarnings { unused_fields: remaining_keys.cloned().collect(), incorrect_type },
2305 /// Load a built-in target
2306 pub fn expect_builtin(target_triple: &TargetTriple) -> Target {
2307 match *target_triple {
2308 TargetTriple::TargetTriple(ref target_triple) => {
2309 load_builtin(target_triple).expect("built-in target")
2311 TargetTriple::TargetJson { .. } => {
2312 panic!("built-in targets doens't support target-paths")
2317 /// Search for a JSON file specifying the given target triple.
2319 /// If none is found in `$RUST_TARGET_PATH`, look for a file called `target.json` inside the
2320 /// sysroot under the target-triple's `rustlib` directory. Note that it could also just be a
2321 /// bare filename already, so also check for that. If one of the hardcoded targets we know
2322 /// about, just return it directly.
2324 /// The error string could come from any of the APIs called, including filesystem access and
2327 target_triple: &TargetTriple,
2329 ) -> Result<(Target, TargetWarnings), String> {
2333 fn load_file(path: &Path) -> Result<(Target, TargetWarnings), String> {
2334 let contents = fs::read_to_string(path).map_err(|e| e.to_string())?;
2335 let obj = serde_json::from_str(&contents).map_err(|e| e.to_string())?;
2336 Target::from_json(obj)
2339 match *target_triple {
2340 TargetTriple::TargetTriple(ref target_triple) => {
2341 // check if triple is in list of built-in targets
2342 if let Some(t) = load_builtin(target_triple) {
2343 return Ok((t, TargetWarnings::empty()));
2346 // search for a file named `target_triple`.json in RUST_TARGET_PATH
2348 let mut target = target_triple.to_string();
2349 target.push_str(".json");
2350 PathBuf::from(target)
2353 let target_path = env::var_os("RUST_TARGET_PATH").unwrap_or_default();
2355 for dir in env::split_paths(&target_path) {
2356 let p = dir.join(&path);
2358 return load_file(&p);
2362 // Additionally look in the sysroot under `lib/rustlib/<triple>/target.json`
2364 let rustlib_path = crate::target_rustlib_path(&sysroot, &target_triple);
2365 let p = PathBuf::from_iter([
2367 Path::new(&rustlib_path),
2368 Path::new("target.json"),
2371 return load_file(&p);
2374 Err(format!("Could not find specification for target {:?}", target_triple))
2376 TargetTriple::TargetJson { ref contents, .. } => {
2377 let obj = serde_json::from_str(contents).map_err(|e| e.to_string())?;
2378 Target::from_json(obj)
2384 impl ToJson for Target {
2385 fn to_json(&self) -> Json {
2386 let mut d = serde_json::Map::new();
2387 let default: TargetOptions = Default::default();
2389 macro_rules! target_val {
2391 let name = (stringify!($attr)).replace("_", "-");
2392 d.insert(name, self.$attr.to_json());
2396 macro_rules! target_option_val {
2398 let name = (stringify!($attr)).replace("_", "-");
2399 if default.$attr != self.$attr {
2400 d.insert(name, self.$attr.to_json());
2403 ($attr:ident, $key_name:expr) => {{
2404 let name = $key_name;
2405 if default.$attr != self.$attr {
2406 d.insert(name.into(), self.$attr.to_json());
2409 (link_args - $attr:ident) => {{
2410 let name = (stringify!($attr)).replace("_", "-");
2411 if default.$attr != self.$attr {
2415 .map(|(k, v)| (k.desc().to_string(), v.clone()))
2416 .collect::<BTreeMap<_, _>>();
2417 d.insert(name, obj.to_json());
2420 (env - $attr:ident) => {{
2421 let name = (stringify!($attr)).replace("_", "-");
2422 if default.$attr != self.$attr {
2426 .map(|&(ref k, ref v)| format!("{k}={v}"))
2427 .collect::<Vec<_>>();
2428 d.insert(name, obj.to_json());
2433 target_val!(llvm_target);
2434 d.insert("target-pointer-width".to_string(), self.pointer_width.to_string().to_json());
2436 target_val!(data_layout);
2438 target_option_val!(is_builtin);
2439 target_option_val!(endian, "target-endian");
2440 target_option_val!(c_int_width, "target-c-int-width");
2441 target_option_val!(os);
2442 target_option_val!(env);
2443 target_option_val!(abi);
2444 target_option_val!(vendor);
2445 target_option_val!(linker_flavor);
2446 target_option_val!(linker);
2447 target_option_val!(lld_flavor);
2448 target_option_val!(pre_link_objects);
2449 target_option_val!(post_link_objects);
2450 target_option_val!(pre_link_objects_self_contained, "pre-link-objects-fallback");
2451 target_option_val!(post_link_objects_self_contained, "post-link-objects-fallback");
2452 target_option_val!(link_self_contained, "crt-objects-fallback");
2453 target_option_val!(link_args - pre_link_args);
2454 target_option_val!(link_args - late_link_args);
2455 target_option_val!(link_args - late_link_args_dynamic);
2456 target_option_val!(link_args - late_link_args_static);
2457 target_option_val!(link_args - post_link_args);
2458 target_option_val!(link_script);
2459 target_option_val!(env - link_env);
2460 target_option_val!(link_env_remove);
2461 target_option_val!(asm_args);
2462 target_option_val!(cpu);
2463 target_option_val!(features);
2464 target_option_val!(dynamic_linking);
2465 target_option_val!(only_cdylib);
2466 target_option_val!(executables);
2467 target_option_val!(relocation_model);
2468 target_option_val!(code_model);
2469 target_option_val!(tls_model);
2470 target_option_val!(disable_redzone);
2471 target_option_val!(frame_pointer);
2472 target_option_val!(function_sections);
2473 target_option_val!(dll_prefix);
2474 target_option_val!(dll_suffix);
2475 target_option_val!(exe_suffix);
2476 target_option_val!(staticlib_prefix);
2477 target_option_val!(staticlib_suffix);
2478 target_option_val!(families, "target-family");
2479 target_option_val!(abi_return_struct_as_int);
2480 target_option_val!(is_like_osx);
2481 target_option_val!(is_like_solaris);
2482 target_option_val!(is_like_windows);
2483 target_option_val!(is_like_msvc);
2484 target_option_val!(is_like_wasm);
2485 target_option_val!(default_dwarf_version);
2486 target_option_val!(linker_is_gnu);
2487 target_option_val!(allows_weak_linkage);
2488 target_option_val!(has_rpath);
2489 target_option_val!(no_default_libraries);
2490 target_option_val!(position_independent_executables);
2491 target_option_val!(static_position_independent_executables);
2492 target_option_val!(needs_plt);
2493 target_option_val!(relro_level);
2494 target_option_val!(archive_format);
2495 target_option_val!(allow_asm);
2496 target_option_val!(main_needs_argc_argv);
2497 target_option_val!(has_thread_local);
2498 target_option_val!(obj_is_bitcode);
2499 target_option_val!(forces_embed_bitcode);
2500 target_option_val!(bitcode_llvm_cmdline);
2501 target_option_val!(min_atomic_width);
2502 target_option_val!(max_atomic_width);
2503 target_option_val!(atomic_cas);
2504 target_option_val!(panic_strategy);
2505 target_option_val!(crt_static_allows_dylibs);
2506 target_option_val!(crt_static_default);
2507 target_option_val!(crt_static_respected);
2508 target_option_val!(stack_probes);
2509 target_option_val!(min_global_align);
2510 target_option_val!(default_codegen_units);
2511 target_option_val!(trap_unreachable);
2512 target_option_val!(requires_lto);
2513 target_option_val!(singlethread);
2514 target_option_val!(no_builtins);
2515 target_option_val!(default_hidden_visibility);
2516 target_option_val!(emit_debug_gdb_scripts);
2517 target_option_val!(requires_uwtable);
2518 target_option_val!(default_uwtable);
2519 target_option_val!(simd_types_indirect);
2520 target_option_val!(limit_rdylib_exports);
2521 target_option_val!(override_export_symbols);
2522 target_option_val!(merge_functions);
2523 target_option_val!(mcount, "target-mcount");
2524 target_option_val!(llvm_abiname);
2525 target_option_val!(relax_elf_relocations);
2526 target_option_val!(llvm_args);
2527 target_option_val!(use_ctors_section);
2528 target_option_val!(eh_frame_header);
2529 target_option_val!(has_thumb_interworking);
2530 target_option_val!(debuginfo_kind);
2531 target_option_val!(split_debuginfo);
2532 target_option_val!(supported_split_debuginfo);
2533 target_option_val!(supported_sanitizers);
2534 target_option_val!(c_enum_min_bits);
2535 target_option_val!(generate_arange_section);
2536 target_option_val!(supports_stack_protector);
2538 if let Some(abi) = self.default_adjusted_cabi {
2539 d.insert("default-adjusted-cabi".into(), Abi::name(abi).to_json());
2546 /// Either a target triple string or a path to a JSON file.
2547 #[derive(Clone, Debug)]
2548 pub enum TargetTriple {
2549 TargetTriple(String),
2551 /// Warning: This field may only be used by rustdoc. Using it anywhere else will lead to
2552 /// inconsistencies as it is discarded during serialization.
2553 path_for_rustdoc: PathBuf,
2559 // Use a manual implementation to ignore the path field
2560 impl PartialEq for TargetTriple {
2561 fn eq(&self, other: &Self) -> bool {
2562 match (self, other) {
2563 (Self::TargetTriple(l0), Self::TargetTriple(r0)) => l0 == r0,
2565 Self::TargetJson { path_for_rustdoc: _, triple: l_triple, contents: l_contents },
2566 Self::TargetJson { path_for_rustdoc: _, triple: r_triple, contents: r_contents },
2567 ) => l_triple == r_triple && l_contents == r_contents,
2573 // Use a manual implementation to ignore the path field
2574 impl Hash for TargetTriple {
2575 fn hash<H: Hasher>(&self, state: &mut H) -> () {
2577 TargetTriple::TargetTriple(triple) => {
2581 TargetTriple::TargetJson { path_for_rustdoc: _, triple, contents } => {
2584 contents.hash(state)
2590 // Use a manual implementation to prevent encoding the target json file path in the crate metadata
2591 impl<S: Encoder> Encodable<S> for TargetTriple {
2592 fn encode(&self, s: &mut S) {
2594 TargetTriple::TargetTriple(triple) => s.emit_enum_variant(0, |s| s.emit_str(triple)),
2595 TargetTriple::TargetJson { path_for_rustdoc: _, triple, contents } => s
2596 .emit_enum_variant(1, |s| {
2598 s.emit_str(contents)
2604 impl<D: Decoder> Decodable<D> for TargetTriple {
2605 fn decode(d: &mut D) -> Self {
2606 match d.read_usize() {
2607 0 => TargetTriple::TargetTriple(d.read_str().to_owned()),
2608 1 => TargetTriple::TargetJson {
2609 path_for_rustdoc: PathBuf::new(),
2610 triple: d.read_str().to_owned(),
2611 contents: d.read_str().to_owned(),
2614 panic!("invalid enum variant tag while decoding `TargetTriple`, expected 0..2");
2621 /// Creates a target triple from the passed target triple string.
2622 pub fn from_triple(triple: &str) -> Self {
2623 TargetTriple::TargetTriple(triple.into())
2626 /// Creates a target triple from the passed target path.
2627 pub fn from_path(path: &Path) -> Result<Self, io::Error> {
2628 let canonicalized_path = path.canonicalize()?;
2629 let contents = std::fs::read_to_string(&canonicalized_path).map_err(|err| {
2631 io::ErrorKind::InvalidInput,
2632 format!("target path {:?} is not a valid file: {}", canonicalized_path, err),
2635 let triple = canonicalized_path
2637 .expect("target path must not be empty")
2639 .expect("target path must be valid unicode")
2641 Ok(TargetTriple::TargetJson { path_for_rustdoc: canonicalized_path, triple, contents })
2644 /// Returns a string triple for this target.
2646 /// If this target is a path, the file name (without extension) is returned.
2647 pub fn triple(&self) -> &str {
2649 TargetTriple::TargetTriple(ref triple)
2650 | TargetTriple::TargetJson { ref triple, .. } => triple,
2654 /// Returns an extended string triple for this target.
2656 /// If this target is a path, a hash of the path is appended to the triple returned
2658 pub fn debug_triple(&self) -> String {
2659 use std::collections::hash_map::DefaultHasher;
2662 TargetTriple::TargetTriple(triple) => triple.to_owned(),
2663 TargetTriple::TargetJson { path_for_rustdoc: _, triple, contents: content } => {
2664 let mut hasher = DefaultHasher::new();
2665 content.hash(&mut hasher);
2666 let hash = hasher.finish();
2667 format!("{}-{}", triple, hash)
2673 impl fmt::Display for TargetTriple {
2674 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
2675 write!(f, "{}", self.debug_triple())