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::spec::abi::{lookup as lookup_abi, Abi};
39 use crate::spec::crt_objects::{CrtObjects, CrtObjectsFallback};
40 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
41 use rustc_serialize::json::{Json, ToJson};
42 use rustc_span::symbol::{sym, Symbol};
43 use std::collections::BTreeMap;
44 use std::convert::TryFrom;
45 use std::iter::FromIterator;
46 use std::ops::{Deref, DerefMut};
47 use std::path::{Path, PathBuf};
48 use std::str::FromStr;
51 use rustc_macros::HashStable_Generic;
66 mod hermit_kernel_base;
71 mod linux_kernel_base;
73 mod linux_uclibc_base;
85 mod windows_msvc_base;
86 mod windows_uwp_gnu_base;
87 mod windows_uwp_msvc_base;
89 #[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
90 pub enum LinkerFlavor {
101 #[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
110 fn from_str(s: &str) -> Option<Self> {
112 "darwin" => LldFlavor::Ld64,
113 "gnu" => LldFlavor::Ld,
114 "link" => LldFlavor::Link,
115 "wasm" => LldFlavor::Wasm,
121 impl ToJson for LldFlavor {
122 fn to_json(&self) -> Json {
124 LldFlavor::Ld64 => "darwin",
125 LldFlavor::Ld => "gnu",
126 LldFlavor::Link => "link",
127 LldFlavor::Wasm => "wasm",
133 impl ToJson for LinkerFlavor {
134 fn to_json(&self) -> Json {
135 self.desc().to_json()
138 macro_rules! flavor_mappings {
139 ($((($($flavor:tt)*), $string:expr),)*) => (
141 pub const fn one_of() -> &'static str {
142 concat!("one of: ", $($string, " ",)*)
145 pub fn from_str(s: &str) -> Option<Self> {
147 $($string => $($flavor)*,)*
152 pub fn desc(&self) -> &str {
154 $($($flavor)* => $string,)*
162 ((LinkerFlavor::Em), "em"),
163 ((LinkerFlavor::Gcc), "gcc"),
164 ((LinkerFlavor::L4Bender), "l4-bender"),
165 ((LinkerFlavor::Ld), "ld"),
166 ((LinkerFlavor::Msvc), "msvc"),
167 ((LinkerFlavor::PtxLinker), "ptx-linker"),
168 ((LinkerFlavor::BpfLinker), "bpf-linker"),
169 ((LinkerFlavor::Lld(LldFlavor::Wasm)), "wasm-ld"),
170 ((LinkerFlavor::Lld(LldFlavor::Ld64)), "ld64.lld"),
171 ((LinkerFlavor::Lld(LldFlavor::Ld)), "ld.lld"),
172 ((LinkerFlavor::Lld(LldFlavor::Link)), "lld-link"),
175 #[derive(Clone, Copy, Debug, PartialEq, Hash, Encodable, Decodable, HashStable_Generic)]
176 pub enum PanicStrategy {
182 pub fn desc(&self) -> &str {
184 PanicStrategy::Unwind => "unwind",
185 PanicStrategy::Abort => "abort",
189 pub fn desc_symbol(&self) -> Symbol {
191 PanicStrategy::Unwind => sym::unwind,
192 PanicStrategy::Abort => sym::abort,
197 impl ToJson for PanicStrategy {
198 fn to_json(&self) -> Json {
200 PanicStrategy::Abort => "abort".to_json(),
201 PanicStrategy::Unwind => "unwind".to_json(),
206 #[derive(Clone, Copy, Debug, PartialEq, Hash, Encodable, Decodable)]
207 pub enum RelroLevel {
215 pub fn desc(&self) -> &str {
217 RelroLevel::Full => "full",
218 RelroLevel::Partial => "partial",
219 RelroLevel::Off => "off",
220 RelroLevel::None => "none",
225 impl FromStr for RelroLevel {
228 fn from_str(s: &str) -> Result<RelroLevel, ()> {
230 "full" => Ok(RelroLevel::Full),
231 "partial" => Ok(RelroLevel::Partial),
232 "off" => Ok(RelroLevel::Off),
233 "none" => Ok(RelroLevel::None),
239 impl ToJson for RelroLevel {
240 fn to_json(&self) -> Json {
242 RelroLevel::Full => "full".to_json(),
243 RelroLevel::Partial => "partial".to_json(),
244 RelroLevel::Off => "off".to_json(),
245 RelroLevel::None => "None".to_json(),
250 #[derive(Clone, Copy, Debug, PartialEq, Hash, Encodable, Decodable)]
251 pub enum MergeFunctions {
257 impl MergeFunctions {
258 pub fn desc(&self) -> &str {
260 MergeFunctions::Disabled => "disabled",
261 MergeFunctions::Trampolines => "trampolines",
262 MergeFunctions::Aliases => "aliases",
267 impl FromStr for MergeFunctions {
270 fn from_str(s: &str) -> Result<MergeFunctions, ()> {
272 "disabled" => Ok(MergeFunctions::Disabled),
273 "trampolines" => Ok(MergeFunctions::Trampolines),
274 "aliases" => Ok(MergeFunctions::Aliases),
280 impl ToJson for MergeFunctions {
281 fn to_json(&self) -> Json {
283 MergeFunctions::Disabled => "disabled".to_json(),
284 MergeFunctions::Trampolines => "trampolines".to_json(),
285 MergeFunctions::Aliases => "aliases".to_json(),
290 #[derive(Clone, Copy, PartialEq, Hash, Debug)]
291 pub enum RelocModel {
301 impl FromStr for RelocModel {
304 fn from_str(s: &str) -> Result<RelocModel, ()> {
306 "static" => RelocModel::Static,
307 "pic" => RelocModel::Pic,
308 "pie" => RelocModel::Pie,
309 "dynamic-no-pic" => RelocModel::DynamicNoPic,
310 "ropi" => RelocModel::Ropi,
311 "rwpi" => RelocModel::Rwpi,
312 "ropi-rwpi" => RelocModel::RopiRwpi,
318 impl ToJson for RelocModel {
319 fn to_json(&self) -> Json {
321 RelocModel::Static => "static",
322 RelocModel::Pic => "pic",
323 RelocModel::Pie => "pie",
324 RelocModel::DynamicNoPic => "dynamic-no-pic",
325 RelocModel::Ropi => "ropi",
326 RelocModel::Rwpi => "rwpi",
327 RelocModel::RopiRwpi => "ropi-rwpi",
333 #[derive(Clone, Copy, PartialEq, Hash, Debug)]
342 impl FromStr for CodeModel {
345 fn from_str(s: &str) -> Result<CodeModel, ()> {
347 "tiny" => CodeModel::Tiny,
348 "small" => CodeModel::Small,
349 "kernel" => CodeModel::Kernel,
350 "medium" => CodeModel::Medium,
351 "large" => CodeModel::Large,
357 impl ToJson for CodeModel {
358 fn to_json(&self) -> Json {
360 CodeModel::Tiny => "tiny",
361 CodeModel::Small => "small",
362 CodeModel::Kernel => "kernel",
363 CodeModel::Medium => "medium",
364 CodeModel::Large => "large",
370 #[derive(Clone, Copy, PartialEq, Hash, Debug)]
378 impl FromStr for TlsModel {
381 fn from_str(s: &str) -> Result<TlsModel, ()> {
383 // Note the difference "general" vs "global" difference. The model name is "general",
384 // but the user-facing option name is "global" for consistency with other compilers.
385 "global-dynamic" => TlsModel::GeneralDynamic,
386 "local-dynamic" => TlsModel::LocalDynamic,
387 "initial-exec" => TlsModel::InitialExec,
388 "local-exec" => TlsModel::LocalExec,
394 impl ToJson for TlsModel {
395 fn to_json(&self) -> Json {
397 TlsModel::GeneralDynamic => "global-dynamic",
398 TlsModel::LocalDynamic => "local-dynamic",
399 TlsModel::InitialExec => "initial-exec",
400 TlsModel::LocalExec => "local-exec",
406 /// Everything is flattened to a single enum to make the json encoding/decoding less annoying.
407 #[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Debug)]
408 pub enum LinkOutputKind {
409 /// Dynamically linked non position-independent executable.
411 /// Dynamically linked position-independent executable.
413 /// Statically linked non position-independent executable.
415 /// Statically linked position-independent executable.
417 /// Regular dynamic library ("dynamically linked").
419 /// Dynamic library with bundled libc ("statically linked").
421 /// WASI module with a lifetime past the _initialize entry point
425 impl LinkOutputKind {
426 fn as_str(&self) -> &'static str {
428 LinkOutputKind::DynamicNoPicExe => "dynamic-nopic-exe",
429 LinkOutputKind::DynamicPicExe => "dynamic-pic-exe",
430 LinkOutputKind::StaticNoPicExe => "static-nopic-exe",
431 LinkOutputKind::StaticPicExe => "static-pic-exe",
432 LinkOutputKind::DynamicDylib => "dynamic-dylib",
433 LinkOutputKind::StaticDylib => "static-dylib",
434 LinkOutputKind::WasiReactorExe => "wasi-reactor-exe",
438 pub(super) fn from_str(s: &str) -> Option<LinkOutputKind> {
440 "dynamic-nopic-exe" => LinkOutputKind::DynamicNoPicExe,
441 "dynamic-pic-exe" => LinkOutputKind::DynamicPicExe,
442 "static-nopic-exe" => LinkOutputKind::StaticNoPicExe,
443 "static-pic-exe" => LinkOutputKind::StaticPicExe,
444 "dynamic-dylib" => LinkOutputKind::DynamicDylib,
445 "static-dylib" => LinkOutputKind::StaticDylib,
446 "wasi-reactor-exe" => LinkOutputKind::WasiReactorExe,
452 impl fmt::Display for LinkOutputKind {
453 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
454 f.write_str(self.as_str())
458 pub type LinkArgs = BTreeMap<LinkerFlavor, Vec<String>>;
460 #[derive(Clone, Copy, Hash, Debug, PartialEq, Eq)]
461 pub enum SplitDebuginfo {
462 /// Split debug-information is disabled, meaning that on supported platforms
463 /// you can find all debug information in the executable itself. This is
464 /// only supported for ELF effectively.
466 /// * Windows - not supported
467 /// * macOS - don't run `dsymutil`
468 /// * ELF - `.dwarf_*` sections
471 /// Split debug-information can be found in a "packed" location separate
472 /// from the final artifact. This is supported on all platforms.
474 /// * Windows - `*.pdb`
475 /// * macOS - `*.dSYM` (run `dsymutil`)
476 /// * ELF - `*.dwp` (run `rust-llvm-dwp`)
479 /// Split debug-information can be found in individual object files on the
480 /// filesystem. The main executable may point to the object files.
482 /// * Windows - not supported
483 /// * macOS - supported, scattered object files
484 /// * ELF - supported, scattered `*.dwo` or `*.o` files (see `SplitDwarfKind`)
488 impl SplitDebuginfo {
489 fn as_str(&self) -> &'static str {
491 SplitDebuginfo::Off => "off",
492 SplitDebuginfo::Packed => "packed",
493 SplitDebuginfo::Unpacked => "unpacked",
498 impl FromStr for SplitDebuginfo {
501 fn from_str(s: &str) -> Result<SplitDebuginfo, ()> {
503 "off" => SplitDebuginfo::Off,
504 "unpacked" => SplitDebuginfo::Unpacked,
505 "packed" => SplitDebuginfo::Packed,
511 impl ToJson for SplitDebuginfo {
512 fn to_json(&self) -> Json {
513 self.as_str().to_json()
517 impl fmt::Display for SplitDebuginfo {
518 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
519 f.write_str(self.as_str())
523 #[derive(Clone, Debug, PartialEq, Eq)]
524 pub enum StackProbeType {
525 /// Don't emit any stack probes.
527 /// It is harmless to use this option even on targets that do not have backend support for
528 /// stack probes as the failure mode is the same as if no stack-probe option was specified in
531 /// Call `__rust_probestack` whenever stack needs to be probed.
533 /// Use inline option for LLVM versions later than specified in `min_llvm_version_for_inline`
534 /// and call `__rust_probestack` otherwise.
535 InlineOrCall { min_llvm_version_for_inline: (u32, u32, u32) },
538 impl StackProbeType {
539 fn from_json(json: &Json) -> Result<Self, String> {
540 let object = json.as_object().ok_or_else(|| "expected a JSON object")?;
543 .and_then(|o| o.as_string())
544 .ok_or_else(|| "expected `kind` to be a string")?;
546 "none" => Ok(StackProbeType::None),
547 "inline" => Ok(StackProbeType::Inline),
548 "call" => Ok(StackProbeType::Call),
549 "inline-or-call" => {
550 let min_version = object
551 .get("min-llvm-version-for-inline")
552 .and_then(|o| o.as_array())
553 .ok_or_else(|| "expected `min-llvm-version-for-inline` to be an array")?;
554 let mut iter = min_version.into_iter().map(|v| {
555 let int = v.as_u64().ok_or_else(
556 || "expected `min-llvm-version-for-inline` values to be integers",
559 .map_err(|_| "`min-llvm-version-for-inline` values don't convert to u32")
561 let min_llvm_version_for_inline = (
562 iter.next().unwrap_or(Ok(11))?,
563 iter.next().unwrap_or(Ok(0))?,
564 iter.next().unwrap_or(Ok(0))?,
566 Ok(StackProbeType::InlineOrCall { min_llvm_version_for_inline })
568 _ => Err(String::from(
569 "`kind` expected to be one of `none`, `inline`, `call` or `inline-or-call`",
575 impl ToJson for StackProbeType {
576 fn to_json(&self) -> Json {
577 Json::Object(match self {
578 StackProbeType::None => {
579 [(String::from("kind"), "none".to_json())].into_iter().collect()
581 StackProbeType::Inline => {
582 [(String::from("kind"), "inline".to_json())].into_iter().collect()
584 StackProbeType::Call => {
585 [(String::from("kind"), "call".to_json())].into_iter().collect()
587 StackProbeType::InlineOrCall { min_llvm_version_for_inline } => [
588 (String::from("kind"), "inline-or-call".to_json()),
590 String::from("min-llvm-version-for-inline"),
591 min_llvm_version_for_inline.to_json(),
600 bitflags::bitflags! {
601 #[derive(Default, Encodable, Decodable)]
602 pub struct SanitizerSet: u8 {
603 const ADDRESS = 1 << 0;
605 const MEMORY = 1 << 2;
606 const THREAD = 1 << 3;
607 const HWADDRESS = 1 << 4;
613 /// Return sanitizer's name
615 /// Returns none if the flags is a set of sanitizers numbering not exactly one.
616 fn as_str(self) -> Option<&'static str> {
618 SanitizerSet::ADDRESS => "address",
619 SanitizerSet::CFI => "cfi",
620 SanitizerSet::LEAK => "leak",
621 SanitizerSet::MEMORY => "memory",
622 SanitizerSet::THREAD => "thread",
623 SanitizerSet::HWADDRESS => "hwaddress",
629 /// Formats a sanitizer set as a comma separated list of sanitizers' names.
630 impl fmt::Display for SanitizerSet {
631 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
632 let mut first = true;
634 let name = s.as_str().unwrap_or_else(|| panic!("unrecognized sanitizer {:?}", s));
645 impl IntoIterator for SanitizerSet {
646 type Item = SanitizerSet;
647 type IntoIter = std::vec::IntoIter<SanitizerSet>;
649 fn into_iter(self) -> Self::IntoIter {
651 SanitizerSet::ADDRESS,
654 SanitizerSet::MEMORY,
655 SanitizerSet::THREAD,
656 SanitizerSet::HWADDRESS,
660 .filter(|&s| self.contains(s))
666 impl<CTX> HashStable<CTX> for SanitizerSet {
667 fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher) {
668 self.bits().hash_stable(ctx, hasher);
672 impl ToJson for SanitizerSet {
673 fn to_json(&self) -> Json {
675 .map(|v| Some(v.as_str()?.to_json()))
676 .collect::<Option<Vec<_>>>()
682 #[derive(Clone, Copy, PartialEq, Hash, Debug)]
683 pub enum FramePointer {
684 /// Forces the machine code generator to always preserve the frame pointers.
686 /// Forces the machine code generator to preserve the frame pointers except for the leaf
687 /// functions (i.e. those that don't call other functions).
689 /// Allows the machine code generator to omit the frame pointers.
691 /// This option does not guarantee that the frame pointers will be omitted.
695 impl FromStr for FramePointer {
697 fn from_str(s: &str) -> Result<Self, ()> {
699 "always" => Self::Always,
700 "non-leaf" => Self::NonLeaf,
701 "may-omit" => Self::MayOmit,
707 impl ToJson for FramePointer {
708 fn to_json(&self) -> Json {
710 Self::Always => "always",
711 Self::NonLeaf => "non-leaf",
712 Self::MayOmit => "may-omit",
718 /// Controls use of stack canaries.
719 #[derive(Clone, Copy, Debug, PartialEq, Hash, Eq)]
720 pub enum StackProtector {
721 /// Disable stack canary generation.
724 /// On LLVM, mark all generated LLVM functions with the `ssp` attribute (see
725 /// llvm/docs/LangRef.rst). This triggers stack canary generation in
726 /// functions which contain an array of a byte-sized type with more than
730 /// On LLVM, mark all generated LLVM functions with the `sspstrong`
731 /// attribute (see llvm/docs/LangRef.rst). This triggers stack canary
732 /// generation in functions which either contain an array, or which take
733 /// the address of a local variable.
736 /// Generate stack canaries in all functions.
740 impl StackProtector {
741 fn as_str(&self) -> &'static str {
743 StackProtector::None => "none",
744 StackProtector::Basic => "basic",
745 StackProtector::Strong => "strong",
746 StackProtector::All => "all",
751 impl FromStr for StackProtector {
754 fn from_str(s: &str) -> Result<StackProtector, ()> {
756 "none" => StackProtector::None,
757 "basic" => StackProtector::Basic,
758 "strong" => StackProtector::Strong,
759 "all" => StackProtector::All,
765 impl fmt::Display for StackProtector {
766 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
767 f.write_str(self.as_str())
771 macro_rules! supported_targets {
772 ( $(($( $triple:literal, )+ $module:ident ),)+ ) => {
775 /// List of supported targets
776 pub const TARGETS: &[&str] = &[$($($triple),+),+];
778 fn load_builtin(target: &str) -> Option<Target> {
779 let mut t = match target {
780 $( $($triple)|+ => $module::target(), )+
784 debug!("got builtin target: {:?}", t);
792 // Cannot put this into a separate file without duplication, make an exception.
796 tests_impl::test_target(super::$module::target());
804 ("x86_64-unknown-linux-gnu", x86_64_unknown_linux_gnu),
805 ("x86_64-unknown-linux-gnux32", x86_64_unknown_linux_gnux32),
806 ("i686-unknown-linux-gnu", i686_unknown_linux_gnu),
807 ("i586-unknown-linux-gnu", i586_unknown_linux_gnu),
808 ("m68k-unknown-linux-gnu", m68k_unknown_linux_gnu),
809 ("mips-unknown-linux-gnu", mips_unknown_linux_gnu),
810 ("mips64-unknown-linux-gnuabi64", mips64_unknown_linux_gnuabi64),
811 ("mips64el-unknown-linux-gnuabi64", mips64el_unknown_linux_gnuabi64),
812 ("mipsisa32r6-unknown-linux-gnu", mipsisa32r6_unknown_linux_gnu),
813 ("mipsisa32r6el-unknown-linux-gnu", mipsisa32r6el_unknown_linux_gnu),
814 ("mipsisa64r6-unknown-linux-gnuabi64", mipsisa64r6_unknown_linux_gnuabi64),
815 ("mipsisa64r6el-unknown-linux-gnuabi64", mipsisa64r6el_unknown_linux_gnuabi64),
816 ("mipsel-unknown-linux-gnu", mipsel_unknown_linux_gnu),
817 ("powerpc-unknown-linux-gnu", powerpc_unknown_linux_gnu),
818 ("powerpc-unknown-linux-gnuspe", powerpc_unknown_linux_gnuspe),
819 ("powerpc-unknown-linux-musl", powerpc_unknown_linux_musl),
820 ("powerpc64-unknown-linux-gnu", powerpc64_unknown_linux_gnu),
821 ("powerpc64-unknown-linux-musl", powerpc64_unknown_linux_musl),
822 ("powerpc64le-unknown-linux-gnu", powerpc64le_unknown_linux_gnu),
823 ("powerpc64le-unknown-linux-musl", powerpc64le_unknown_linux_musl),
824 ("s390x-unknown-linux-gnu", s390x_unknown_linux_gnu),
825 ("s390x-unknown-linux-musl", s390x_unknown_linux_musl),
826 ("sparc-unknown-linux-gnu", sparc_unknown_linux_gnu),
827 ("sparc64-unknown-linux-gnu", sparc64_unknown_linux_gnu),
828 ("arm-unknown-linux-gnueabi", arm_unknown_linux_gnueabi),
829 ("arm-unknown-linux-gnueabihf", arm_unknown_linux_gnueabihf),
830 ("arm-unknown-linux-musleabi", arm_unknown_linux_musleabi),
831 ("arm-unknown-linux-musleabihf", arm_unknown_linux_musleabihf),
832 ("armv4t-unknown-linux-gnueabi", armv4t_unknown_linux_gnueabi),
833 ("armv5te-unknown-linux-gnueabi", armv5te_unknown_linux_gnueabi),
834 ("armv5te-unknown-linux-musleabi", armv5te_unknown_linux_musleabi),
835 ("armv5te-unknown-linux-uclibceabi", armv5te_unknown_linux_uclibceabi),
836 ("armv7-unknown-linux-gnueabi", armv7_unknown_linux_gnueabi),
837 ("armv7-unknown-linux-gnueabihf", armv7_unknown_linux_gnueabihf),
838 ("thumbv7neon-unknown-linux-gnueabihf", thumbv7neon_unknown_linux_gnueabihf),
839 ("thumbv7neon-unknown-linux-musleabihf", thumbv7neon_unknown_linux_musleabihf),
840 ("armv7-unknown-linux-musleabi", armv7_unknown_linux_musleabi),
841 ("armv7-unknown-linux-musleabihf", armv7_unknown_linux_musleabihf),
842 ("aarch64-unknown-linux-gnu", aarch64_unknown_linux_gnu),
843 ("aarch64-unknown-linux-musl", aarch64_unknown_linux_musl),
844 ("x86_64-unknown-linux-musl", x86_64_unknown_linux_musl),
845 ("i686-unknown-linux-musl", i686_unknown_linux_musl),
846 ("i586-unknown-linux-musl", i586_unknown_linux_musl),
847 ("mips-unknown-linux-musl", mips_unknown_linux_musl),
848 ("mipsel-unknown-linux-musl", mipsel_unknown_linux_musl),
849 ("mips64-unknown-linux-muslabi64", mips64_unknown_linux_muslabi64),
850 ("mips64el-unknown-linux-muslabi64", mips64el_unknown_linux_muslabi64),
851 ("hexagon-unknown-linux-musl", hexagon_unknown_linux_musl),
853 ("mips-unknown-linux-uclibc", mips_unknown_linux_uclibc),
854 ("mipsel-unknown-linux-uclibc", mipsel_unknown_linux_uclibc),
856 ("i686-linux-android", i686_linux_android),
857 ("x86_64-linux-android", x86_64_linux_android),
858 ("arm-linux-androideabi", arm_linux_androideabi),
859 ("armv7-linux-androideabi", armv7_linux_androideabi),
860 ("thumbv7neon-linux-androideabi", thumbv7neon_linux_androideabi),
861 ("aarch64-linux-android", aarch64_linux_android),
863 ("x86_64-unknown-none-linuxkernel", x86_64_unknown_none_linuxkernel),
865 ("aarch64-unknown-freebsd", aarch64_unknown_freebsd),
866 ("armv6-unknown-freebsd", armv6_unknown_freebsd),
867 ("armv7-unknown-freebsd", armv7_unknown_freebsd),
868 ("i686-unknown-freebsd", i686_unknown_freebsd),
869 ("powerpc-unknown-freebsd", powerpc_unknown_freebsd),
870 ("powerpc64-unknown-freebsd", powerpc64_unknown_freebsd),
871 ("powerpc64le-unknown-freebsd", powerpc64le_unknown_freebsd),
872 ("riscv64gc-unknown-freebsd", riscv64gc_unknown_freebsd),
873 ("x86_64-unknown-freebsd", x86_64_unknown_freebsd),
875 ("x86_64-unknown-dragonfly", x86_64_unknown_dragonfly),
877 ("aarch64-unknown-openbsd", aarch64_unknown_openbsd),
878 ("i686-unknown-openbsd", i686_unknown_openbsd),
879 ("sparc64-unknown-openbsd", sparc64_unknown_openbsd),
880 ("x86_64-unknown-openbsd", x86_64_unknown_openbsd),
881 ("powerpc-unknown-openbsd", powerpc_unknown_openbsd),
883 ("aarch64-unknown-netbsd", aarch64_unknown_netbsd),
884 ("armv6-unknown-netbsd-eabihf", armv6_unknown_netbsd_eabihf),
885 ("armv7-unknown-netbsd-eabihf", armv7_unknown_netbsd_eabihf),
886 ("i686-unknown-netbsd", i686_unknown_netbsd),
887 ("powerpc-unknown-netbsd", powerpc_unknown_netbsd),
888 ("sparc64-unknown-netbsd", sparc64_unknown_netbsd),
889 ("x86_64-unknown-netbsd", x86_64_unknown_netbsd),
891 ("i686-unknown-haiku", i686_unknown_haiku),
892 ("x86_64-unknown-haiku", x86_64_unknown_haiku),
894 ("aarch64-apple-darwin", aarch64_apple_darwin),
895 ("x86_64-apple-darwin", x86_64_apple_darwin),
896 ("i686-apple-darwin", i686_apple_darwin),
898 ("aarch64-fuchsia", aarch64_fuchsia),
899 ("x86_64-fuchsia", x86_64_fuchsia),
901 ("avr-unknown-gnu-atmega328", avr_unknown_gnu_atmega328),
903 ("x86_64-unknown-l4re-uclibc", x86_64_unknown_l4re_uclibc),
905 ("aarch64-unknown-redox", aarch64_unknown_redox),
906 ("x86_64-unknown-redox", x86_64_unknown_redox),
908 ("i386-apple-ios", i386_apple_ios),
909 ("x86_64-apple-ios", x86_64_apple_ios),
910 ("aarch64-apple-ios", aarch64_apple_ios),
911 ("armv7-apple-ios", armv7_apple_ios),
912 ("armv7s-apple-ios", armv7s_apple_ios),
913 ("x86_64-apple-ios-macabi", x86_64_apple_ios_macabi),
914 ("aarch64-apple-ios-macabi", aarch64_apple_ios_macabi),
915 ("aarch64-apple-ios-sim", aarch64_apple_ios_sim),
916 ("aarch64-apple-tvos", aarch64_apple_tvos),
917 ("x86_64-apple-tvos", x86_64_apple_tvos),
919 ("armebv7r-none-eabi", armebv7r_none_eabi),
920 ("armebv7r-none-eabihf", armebv7r_none_eabihf),
921 ("armv7r-none-eabi", armv7r_none_eabi),
922 ("armv7r-none-eabihf", armv7r_none_eabihf),
924 ("x86_64-pc-solaris", x86_64_pc_solaris),
925 ("x86_64-sun-solaris", x86_64_sun_solaris),
926 ("sparcv9-sun-solaris", sparcv9_sun_solaris),
928 ("x86_64-unknown-illumos", x86_64_unknown_illumos),
930 ("x86_64-pc-windows-gnu", x86_64_pc_windows_gnu),
931 ("i686-pc-windows-gnu", i686_pc_windows_gnu),
932 ("i686-uwp-windows-gnu", i686_uwp_windows_gnu),
933 ("x86_64-uwp-windows-gnu", x86_64_uwp_windows_gnu),
935 ("aarch64-pc-windows-msvc", aarch64_pc_windows_msvc),
936 ("aarch64-uwp-windows-msvc", aarch64_uwp_windows_msvc),
937 ("x86_64-pc-windows-msvc", x86_64_pc_windows_msvc),
938 ("x86_64-uwp-windows-msvc", x86_64_uwp_windows_msvc),
939 ("i686-pc-windows-msvc", i686_pc_windows_msvc),
940 ("i686-uwp-windows-msvc", i686_uwp_windows_msvc),
941 ("i586-pc-windows-msvc", i586_pc_windows_msvc),
942 ("thumbv7a-pc-windows-msvc", thumbv7a_pc_windows_msvc),
943 ("thumbv7a-uwp-windows-msvc", thumbv7a_uwp_windows_msvc),
945 ("asmjs-unknown-emscripten", asmjs_unknown_emscripten),
946 ("wasm32-unknown-emscripten", wasm32_unknown_emscripten),
947 ("wasm32-unknown-unknown", wasm32_unknown_unknown),
948 ("wasm32-wasi", wasm32_wasi),
949 ("wasm64-unknown-unknown", wasm64_unknown_unknown),
951 ("thumbv6m-none-eabi", thumbv6m_none_eabi),
952 ("thumbv7m-none-eabi", thumbv7m_none_eabi),
953 ("thumbv7em-none-eabi", thumbv7em_none_eabi),
954 ("thumbv7em-none-eabihf", thumbv7em_none_eabihf),
955 ("thumbv8m.base-none-eabi", thumbv8m_base_none_eabi),
956 ("thumbv8m.main-none-eabi", thumbv8m_main_none_eabi),
957 ("thumbv8m.main-none-eabihf", thumbv8m_main_none_eabihf),
959 ("armv7a-none-eabi", armv7a_none_eabi),
960 ("armv7a-none-eabihf", armv7a_none_eabihf),
962 ("msp430-none-elf", msp430_none_elf),
964 ("aarch64-unknown-hermit", aarch64_unknown_hermit),
965 ("x86_64-unknown-hermit", x86_64_unknown_hermit),
967 ("x86_64-unknown-none-hermitkernel", x86_64_unknown_none_hermitkernel),
969 ("riscv32i-unknown-none-elf", riscv32i_unknown_none_elf),
970 ("riscv32imc-unknown-none-elf", riscv32imc_unknown_none_elf),
971 ("riscv32imc-esp-espidf", riscv32imc_esp_espidf),
972 ("riscv32imac-unknown-none-elf", riscv32imac_unknown_none_elf),
973 ("riscv32gc-unknown-linux-gnu", riscv32gc_unknown_linux_gnu),
974 ("riscv32gc-unknown-linux-musl", riscv32gc_unknown_linux_musl),
975 ("riscv64imac-unknown-none-elf", riscv64imac_unknown_none_elf),
976 ("riscv64gc-unknown-none-elf", riscv64gc_unknown_none_elf),
977 ("riscv64gc-unknown-linux-gnu", riscv64gc_unknown_linux_gnu),
978 ("riscv64gc-unknown-linux-musl", riscv64gc_unknown_linux_musl),
980 ("aarch64-unknown-none", aarch64_unknown_none),
981 ("aarch64-unknown-none-softfloat", aarch64_unknown_none_softfloat),
983 ("x86_64-fortanix-unknown-sgx", x86_64_fortanix_unknown_sgx),
985 ("x86_64-unknown-uefi", x86_64_unknown_uefi),
986 ("i686-unknown-uefi", i686_unknown_uefi),
987 ("aarch64-unknown-uefi", aarch64_unknown_uefi),
989 ("nvptx64-nvidia-cuda", nvptx64_nvidia_cuda),
991 ("i686-wrs-vxworks", i686_wrs_vxworks),
992 ("x86_64-wrs-vxworks", x86_64_wrs_vxworks),
993 ("armv7-wrs-vxworks-eabihf", armv7_wrs_vxworks_eabihf),
994 ("aarch64-wrs-vxworks", aarch64_wrs_vxworks),
995 ("powerpc-wrs-vxworks", powerpc_wrs_vxworks),
996 ("powerpc-wrs-vxworks-spe", powerpc_wrs_vxworks_spe),
997 ("powerpc64-wrs-vxworks", powerpc64_wrs_vxworks),
999 ("aarch64-kmc-solid_asp3", aarch64_kmc_solid_asp3),
1000 ("armv7a-kmc-solid_asp3-eabi", armv7a_kmc_solid_asp3_eabi),
1001 ("armv7a-kmc-solid_asp3-eabihf", armv7a_kmc_solid_asp3_eabihf),
1003 ("mipsel-sony-psp", mipsel_sony_psp),
1004 ("mipsel-unknown-none", mipsel_unknown_none),
1005 ("thumbv4t-none-eabi", thumbv4t_none_eabi),
1007 ("aarch64_be-unknown-linux-gnu", aarch64_be_unknown_linux_gnu),
1008 ("aarch64-unknown-linux-gnu_ilp32", aarch64_unknown_linux_gnu_ilp32),
1009 ("aarch64_be-unknown-linux-gnu_ilp32", aarch64_be_unknown_linux_gnu_ilp32),
1011 ("bpfeb-unknown-none", bpfeb_unknown_none),
1012 ("bpfel-unknown-none", bpfel_unknown_none),
1014 ("armv6k-nintendo-3ds", armv6k_nintendo_3ds),
1016 ("armv7-unknown-linux-uclibceabihf", armv7_unknown_linux_uclibceabihf),
1018 ("x86_64-unknown-none", x86_64_unknown_none),
1021 /// Warnings encountered when parsing the target `json`.
1023 /// Includes fields that weren't recognized and fields that don't have the expected type.
1024 #[derive(Debug, PartialEq)]
1025 pub struct TargetWarnings {
1026 unused_fields: Vec<String>,
1027 incorrect_type: Vec<String>,
1030 impl TargetWarnings {
1031 pub fn empty() -> Self {
1032 Self { unused_fields: Vec::new(), incorrect_type: Vec::new() }
1035 pub fn warning_messages(&self) -> Vec<String> {
1036 let mut warnings = vec![];
1037 if !self.unused_fields.is_empty() {
1038 warnings.push(format!(
1039 "target json file contains unused fields: {}",
1040 self.unused_fields.join(", ")
1043 if !self.incorrect_type.is_empty() {
1044 warnings.push(format!(
1045 "target json file contains fields whose value doesn't have the correct json type: {}",
1046 self.incorrect_type.join(", ")
1053 /// Everything `rustc` knows about how to compile for a specific target.
1055 /// Every field here must be specified, and has no default value.
1056 #[derive(PartialEq, Clone, Debug)]
1058 /// Target triple to pass to LLVM.
1059 pub llvm_target: String,
1060 /// Number of bits in a pointer. Influences the `target_pointer_width` `cfg` variable.
1061 pub pointer_width: u32,
1062 /// Architecture to use for ABI considerations. Valid options include: "x86",
1063 /// "x86_64", "arm", "aarch64", "mips", "powerpc", "powerpc64", and others.
1065 /// [Data layout](https://llvm.org/docs/LangRef.html#data-layout) to pass to LLVM.
1066 pub data_layout: String,
1067 /// Optional settings with defaults.
1068 pub options: TargetOptions,
1071 pub trait HasTargetSpec {
1072 fn target_spec(&self) -> &Target;
1075 impl HasTargetSpec for Target {
1077 fn target_spec(&self) -> &Target {
1082 /// Optional aspects of a target specification.
1084 /// This has an implementation of `Default`, see each field for what the default is. In general,
1085 /// these try to take "minimal defaults" that don't assume anything about the runtime they run in.
1087 /// `TargetOptions` as a separate structure is mostly an implementation detail of `Target`
1088 /// construction, all its fields logically belong to `Target` and available from `Target`
1089 /// through `Deref` impls.
1090 #[derive(PartialEq, Clone, Debug)]
1091 pub struct TargetOptions {
1092 /// Whether the target is built-in or loaded from a custom target specification.
1093 pub is_builtin: bool,
1095 /// Used as the `target_endian` `cfg` variable. Defaults to little endian.
1097 /// Width of c_int type. Defaults to "32".
1098 pub c_int_width: String,
1099 /// OS name to use for conditional compilation (`target_os`). Defaults to "none".
1100 /// "none" implies a bare metal target without `std` library.
1101 /// A couple of targets having `std` also use "unknown" as an `os` value,
1102 /// but they are exceptions.
1104 /// Environment name to use for conditional compilation (`target_env`). Defaults to "".
1106 /// ABI name to distinguish multiple ABIs on the same OS and architecture. For instance, `"eabi"`
1107 /// or `"eabihf"`. Defaults to "".
1109 /// Vendor name to use for conditional compilation (`target_vendor`). Defaults to "unknown".
1111 /// Default linker flavor used if `-C linker-flavor` or `-C linker` are not passed
1112 /// on the command line. Defaults to `LinkerFlavor::Gcc`.
1113 pub linker_flavor: LinkerFlavor,
1115 /// Linker to invoke
1116 pub linker: Option<String>,
1118 /// LLD flavor used if `lld` (or `rust-lld`) is specified as a linker
1119 /// without clarifying its flavor in any way.
1120 pub lld_flavor: LldFlavor,
1122 /// Linker arguments that are passed *before* any user-defined libraries.
1123 pub pre_link_args: LinkArgs,
1124 /// Objects to link before and after all other object code.
1125 pub pre_link_objects: CrtObjects,
1126 pub post_link_objects: CrtObjects,
1127 /// Same as `(pre|post)_link_objects`, but when we fail to pull the objects with help of the
1128 /// target's native gcc and fall back to the "self-contained" mode and pull them manually.
1129 /// See `crt_objects.rs` for some more detailed documentation.
1130 pub pre_link_objects_fallback: CrtObjects,
1131 pub post_link_objects_fallback: CrtObjects,
1132 /// Which logic to use to determine whether to fall back to the "self-contained" mode or not.
1133 pub crt_objects_fallback: Option<CrtObjectsFallback>,
1135 /// Linker arguments that are unconditionally passed after any
1136 /// user-defined but before post-link objects. Standard platform
1137 /// libraries that should be always be linked to, usually go here.
1138 pub late_link_args: LinkArgs,
1139 /// Linker arguments used in addition to `late_link_args` if at least one
1140 /// Rust dependency is dynamically linked.
1141 pub late_link_args_dynamic: LinkArgs,
1142 /// Linker arguments used in addition to `late_link_args` if aall Rust
1143 /// dependencies are statically linked.
1144 pub late_link_args_static: LinkArgs,
1145 /// Linker arguments that are unconditionally passed *after* any
1146 /// user-defined libraries.
1147 pub post_link_args: LinkArgs,
1148 /// Optional link script applied to `dylib` and `executable` crate types.
1149 /// This is a string containing the script, not a path. Can only be applied
1150 /// to linkers where `linker_is_gnu` is true.
1151 pub link_script: Option<String>,
1153 /// Environment variables to be set for the linker invocation.
1154 pub link_env: Vec<(String, String)>,
1155 /// Environment variables to be removed for the linker invocation.
1156 pub link_env_remove: Vec<String>,
1158 /// Extra arguments to pass to the external assembler (when used)
1159 pub asm_args: Vec<String>,
1161 /// Default CPU to pass to LLVM. Corresponds to `llc -mcpu=$cpu`. Defaults
1164 /// Default target features to pass to LLVM. These features will *always* be
1165 /// passed, and cannot be disabled even via `-C`. Corresponds to `llc
1166 /// -mattr=$features`.
1167 pub features: String,
1168 /// Whether dynamic linking is available on this target. Defaults to false.
1169 pub dynamic_linking: bool,
1170 /// If dynamic linking is available, whether only cdylibs are supported.
1171 pub only_cdylib: bool,
1172 /// Whether executables are available on this target. iOS, for example, only allows static
1173 /// libraries. Defaults to false.
1174 pub executables: bool,
1175 /// Relocation model to use in object file. Corresponds to `llc
1176 /// -relocation-model=$relocation_model`. Defaults to `Pic`.
1177 pub relocation_model: RelocModel,
1178 /// Code model to use. Corresponds to `llc -code-model=$code_model`.
1179 /// Defaults to `None` which means "inherited from the base LLVM target".
1180 pub code_model: Option<CodeModel>,
1181 /// TLS model to use. Options are "global-dynamic" (default), "local-dynamic", "initial-exec"
1182 /// and "local-exec". This is similar to the -ftls-model option in GCC/Clang.
1183 pub tls_model: TlsModel,
1184 /// Do not emit code that uses the "red zone", if the ABI has one. Defaults to false.
1185 pub disable_redzone: bool,
1186 /// Frame pointer mode for this target. Defaults to `MayOmit`.
1187 pub frame_pointer: FramePointer,
1188 /// Emit each function in its own section. Defaults to true.
1189 pub function_sections: bool,
1190 /// String to prepend to the name of every dynamic library. Defaults to "lib".
1191 pub dll_prefix: String,
1192 /// String to append to the name of every dynamic library. Defaults to ".so".
1193 pub dll_suffix: String,
1194 /// String to append to the name of every executable.
1195 pub exe_suffix: String,
1196 /// String to prepend to the name of every static library. Defaults to "lib".
1197 pub staticlib_prefix: String,
1198 /// String to append to the name of every static library. Defaults to ".a".
1199 pub staticlib_suffix: String,
1200 /// Values of the `target_family` cfg set for this target.
1202 /// Common options are: "unix", "windows". Defaults to no families.
1204 /// See <https://doc.rust-lang.org/reference/conditional-compilation.html#target_family>.
1205 pub families: Vec<String>,
1206 /// Whether the target toolchain's ABI supports returning small structs as an integer.
1207 pub abi_return_struct_as_int: bool,
1208 /// Whether the target toolchain is like macOS's. Only useful for compiling against iOS/macOS,
1209 /// in particular running dsymutil and some other stuff like `-dead_strip`. Defaults to false.
1210 pub is_like_osx: bool,
1211 /// Whether the target toolchain is like Solaris's.
1212 /// Only useful for compiling against Illumos/Solaris,
1213 /// as they have a different set of linker flags. Defaults to false.
1214 pub is_like_solaris: bool,
1215 /// Whether the target is like Windows.
1216 /// This is a combination of several more specific properties represented as a single flag:
1217 /// - The target uses a Windows ABI,
1218 /// - uses PE/COFF as a format for object code,
1219 /// - uses Windows-style dllexport/dllimport for shared libraries,
1220 /// - uses import libraries and .def files for symbol exports,
1221 /// - executables support setting a subsystem.
1222 pub is_like_windows: bool,
1223 /// Whether the target is like MSVC.
1224 /// This is a combination of several more specific properties represented as a single flag:
1225 /// - The target has all the properties from `is_like_windows`
1226 /// (for in-tree targets "is_like_msvc ⇒ is_like_windows" is ensured by a unit test),
1227 /// - has some MSVC-specific Windows ABI properties,
1228 /// - uses a link.exe-like linker,
1229 /// - uses CodeView/PDB for debuginfo and natvis for its visualization,
1230 /// - uses SEH-based unwinding,
1231 /// - supports control flow guard mechanism.
1232 pub is_like_msvc: bool,
1233 /// Whether the target toolchain is like Emscripten's. Only useful for compiling with
1234 /// Emscripten toolchain.
1235 /// Defaults to false.
1236 pub is_like_emscripten: bool,
1237 /// Whether the target toolchain is like Fuchsia's.
1238 pub is_like_fuchsia: bool,
1239 /// Whether a target toolchain is like WASM.
1240 pub is_like_wasm: bool,
1241 /// Version of DWARF to use if not using the default.
1242 /// Useful because some platforms (osx, bsd) only want up to DWARF2.
1243 pub dwarf_version: Option<u32>,
1244 /// Whether the linker support GNU-like arguments such as -O. Defaults to true.
1245 pub linker_is_gnu: bool,
1246 /// The MinGW toolchain has a known issue that prevents it from correctly
1247 /// handling COFF object files with more than 2<sup>15</sup> sections. Since each weak
1248 /// symbol needs its own COMDAT section, weak linkage implies a large
1249 /// number sections that easily exceeds the given limit for larger
1250 /// codebases. Consequently we want a way to disallow weak linkage on some
1252 pub allows_weak_linkage: bool,
1253 /// Whether the linker support rpaths or not. Defaults to false.
1254 pub has_rpath: bool,
1255 /// Whether to disable linking to the default libraries, typically corresponds
1256 /// to `-nodefaultlibs`. Defaults to true.
1257 pub no_default_libraries: bool,
1258 /// Dynamically linked executables can be compiled as position independent
1259 /// if the default relocation model of position independent code is not
1260 /// changed. This is a requirement to take advantage of ASLR, as otherwise
1261 /// the functions in the executable are not randomized and can be used
1262 /// during an exploit of a vulnerability in any code.
1263 pub position_independent_executables: bool,
1264 /// Executables that are both statically linked and position-independent are supported.
1265 pub static_position_independent_executables: bool,
1266 /// Determines if the target always requires using the PLT for indirect
1267 /// library calls or not. This controls the default value of the `-Z plt` flag.
1268 pub needs_plt: bool,
1269 /// Either partial, full, or off. Full RELRO makes the dynamic linker
1270 /// resolve all symbols at startup and marks the GOT read-only before
1271 /// starting the program, preventing overwriting the GOT.
1272 pub relro_level: RelroLevel,
1273 /// Format that archives should be emitted in. This affects whether we use
1274 /// LLVM to assemble an archive or fall back to the system linker, and
1275 /// currently only "gnu" is used to fall into LLVM. Unknown strings cause
1276 /// the system linker to be used.
1277 pub archive_format: String,
1278 /// Is asm!() allowed? Defaults to true.
1279 pub allow_asm: bool,
1280 /// Whether the runtime startup code requires the `main` function be passed
1281 /// `argc` and `argv` values.
1282 pub main_needs_argc_argv: bool,
1284 /// Flag indicating whether #[thread_local] is available for this target.
1285 pub has_thread_local: bool,
1286 // This is mainly for easy compatibility with emscripten.
1287 // If we give emcc .o files that are actually .bc files it
1288 // will 'just work'.
1289 pub obj_is_bitcode: bool,
1290 /// Whether the target requires that emitted object code includes bitcode.
1291 pub forces_embed_bitcode: bool,
1292 /// Content of the LLVM cmdline section associated with embedded bitcode.
1293 pub bitcode_llvm_cmdline: String,
1295 /// Don't use this field; instead use the `.min_atomic_width()` method.
1296 pub min_atomic_width: Option<u64>,
1298 /// Don't use this field; instead use the `.max_atomic_width()` method.
1299 pub max_atomic_width: Option<u64>,
1301 /// Whether the target supports atomic CAS operations natively
1302 pub atomic_cas: bool,
1304 /// Panic strategy: "unwind" or "abort"
1305 pub panic_strategy: PanicStrategy,
1307 /// Whether or not linking dylibs to a static CRT is allowed.
1308 pub crt_static_allows_dylibs: bool,
1309 /// Whether or not the CRT is statically linked by default.
1310 pub crt_static_default: bool,
1311 /// Whether or not crt-static is respected by the compiler (or is a no-op).
1312 pub crt_static_respected: bool,
1314 /// The implementation of stack probes to use.
1315 pub stack_probes: StackProbeType,
1317 /// The minimum alignment for global symbols.
1318 pub min_global_align: Option<u64>,
1320 /// Default number of codegen units to use in debug mode
1321 pub default_codegen_units: Option<u64>,
1323 /// Whether to generate trap instructions in places where optimization would
1324 /// otherwise produce control flow that falls through into unrelated memory.
1325 pub trap_unreachable: bool,
1327 /// This target requires everything to be compiled with LTO to emit a final
1328 /// executable, aka there is no native linker for this target.
1329 pub requires_lto: bool,
1331 /// This target has no support for threads.
1332 pub singlethread: bool,
1334 /// Whether library functions call lowering/optimization is disabled in LLVM
1335 /// for this target unconditionally.
1336 pub no_builtins: bool,
1338 /// The default visibility for symbols in this target should be "hidden"
1339 /// rather than "default"
1340 pub default_hidden_visibility: bool,
1342 /// Whether a .debug_gdb_scripts section will be added to the output object file
1343 pub emit_debug_gdb_scripts: bool,
1345 /// Whether or not to unconditionally `uwtable` attributes on functions,
1346 /// typically because the platform needs to unwind for things like stack
1348 pub requires_uwtable: bool,
1350 /// Whether or not to emit `uwtable` attributes on functions if `-C force-unwind-tables`
1351 /// is not specified and `uwtable` is not required on this target.
1352 pub default_uwtable: bool,
1354 /// Whether or not SIMD types are passed by reference in the Rust ABI,
1355 /// typically required if a target can be compiled with a mixed set of
1356 /// target features. This is `true` by default, and `false` for targets like
1357 /// wasm32 where the whole program either has simd or not.
1358 pub simd_types_indirect: bool,
1360 /// Pass a list of symbol which should be exported in the dylib to the linker.
1361 pub limit_rdylib_exports: bool,
1363 /// If set, have the linker export exactly these symbols, instead of using
1364 /// the usual logic to figure this out from the crate itself.
1365 pub override_export_symbols: Option<Vec<String>>,
1367 /// Determines how or whether the MergeFunctions LLVM pass should run for
1368 /// this target. Either "disabled", "trampolines", or "aliases".
1369 /// The MergeFunctions pass is generally useful, but some targets may need
1370 /// to opt out. The default is "aliases".
1372 /// Workaround for: <https://github.com/rust-lang/rust/issues/57356>
1373 pub merge_functions: MergeFunctions,
1375 /// Use platform dependent mcount function
1378 /// LLVM ABI name, corresponds to the '-mabi' parameter available in multilib C compilers
1379 pub llvm_abiname: String,
1381 /// Whether or not RelaxElfRelocation flag will be passed to the linker
1382 pub relax_elf_relocations: bool,
1384 /// Additional arguments to pass to LLVM, similar to the `-C llvm-args` codegen option.
1385 pub llvm_args: Vec<String>,
1387 /// Whether to use legacy .ctors initialization hooks rather than .init_array. Defaults
1388 /// to false (uses .init_array).
1389 pub use_ctors_section: bool,
1391 /// Whether the linker is instructed to add a `GNU_EH_FRAME` ELF header
1392 /// used to locate unwinding information is passed
1393 /// (only has effect if the linker is `ld`-like).
1394 pub eh_frame_header: bool,
1396 /// Is true if the target is an ARM architecture using thumb v1 which allows for
1397 /// thumb and arm interworking.
1398 pub has_thumb_interworking: bool,
1400 /// How to handle split debug information, if at all. Specifying `None` has
1401 /// target-specific meaning.
1402 pub split_debuginfo: SplitDebuginfo,
1404 /// The sanitizers supported by this target
1406 /// Note that the support here is at a codegen level. If the machine code with sanitizer
1407 /// enabled can generated on this target, but the necessary supporting libraries are not
1408 /// distributed with the target, the sanitizer should still appear in this list for the target.
1409 pub supported_sanitizers: SanitizerSet,
1411 /// If present it's a default value to use for adjusting the C ABI.
1412 pub default_adjusted_cabi: Option<Abi>,
1414 /// Minimum number of bits in #[repr(C)] enum. Defaults to 32.
1415 pub c_enum_min_bits: u64,
1417 /// Whether or not the DWARF `.debug_aranges` section should be generated.
1418 pub generate_arange_section: bool,
1420 /// Whether the target supports stack canary checks. `true` by default,
1421 /// since this is most common among tier 1 and tier 2 targets.
1422 pub supports_stack_protector: bool,
1425 impl Default for TargetOptions {
1426 /// Creates a set of "sane defaults" for any target. This is still
1427 /// incomplete, and if used for compilation, will certainly not work.
1428 fn default() -> TargetOptions {
1431 endian: Endian::Little,
1432 c_int_width: "32".to_string(),
1433 os: "none".to_string(),
1436 vendor: "unknown".to_string(),
1437 linker_flavor: LinkerFlavor::Gcc,
1438 linker: option_env!("CFG_DEFAULT_LINKER").map(|s| s.to_string()),
1439 lld_flavor: LldFlavor::Ld,
1440 pre_link_args: LinkArgs::new(),
1441 post_link_args: LinkArgs::new(),
1443 asm_args: Vec::new(),
1444 cpu: "generic".to_string(),
1445 features: String::new(),
1446 dynamic_linking: false,
1449 relocation_model: RelocModel::Pic,
1451 tls_model: TlsModel::GeneralDynamic,
1452 disable_redzone: false,
1453 frame_pointer: FramePointer::MayOmit,
1454 function_sections: true,
1455 dll_prefix: "lib".to_string(),
1456 dll_suffix: ".so".to_string(),
1457 exe_suffix: String::new(),
1458 staticlib_prefix: "lib".to_string(),
1459 staticlib_suffix: ".a".to_string(),
1460 families: Vec::new(),
1461 abi_return_struct_as_int: false,
1463 is_like_solaris: false,
1464 is_like_windows: false,
1465 is_like_emscripten: false,
1466 is_like_msvc: false,
1467 is_like_fuchsia: false,
1468 is_like_wasm: false,
1469 dwarf_version: None,
1470 linker_is_gnu: true,
1471 allows_weak_linkage: true,
1473 no_default_libraries: true,
1474 position_independent_executables: false,
1475 static_position_independent_executables: false,
1477 relro_level: RelroLevel::None,
1478 pre_link_objects: Default::default(),
1479 post_link_objects: Default::default(),
1480 pre_link_objects_fallback: Default::default(),
1481 post_link_objects_fallback: Default::default(),
1482 crt_objects_fallback: None,
1483 late_link_args: LinkArgs::new(),
1484 late_link_args_dynamic: LinkArgs::new(),
1485 late_link_args_static: LinkArgs::new(),
1486 link_env: Vec::new(),
1487 link_env_remove: Vec::new(),
1488 archive_format: "gnu".to_string(),
1489 main_needs_argc_argv: true,
1491 has_thread_local: false,
1492 obj_is_bitcode: false,
1493 forces_embed_bitcode: false,
1494 bitcode_llvm_cmdline: String::new(),
1495 min_atomic_width: None,
1496 max_atomic_width: None,
1498 panic_strategy: PanicStrategy::Unwind,
1499 crt_static_allows_dylibs: false,
1500 crt_static_default: false,
1501 crt_static_respected: false,
1502 stack_probes: StackProbeType::None,
1503 min_global_align: None,
1504 default_codegen_units: None,
1505 trap_unreachable: true,
1506 requires_lto: false,
1507 singlethread: false,
1509 default_hidden_visibility: false,
1510 emit_debug_gdb_scripts: true,
1511 requires_uwtable: false,
1512 default_uwtable: false,
1513 simd_types_indirect: true,
1514 limit_rdylib_exports: true,
1515 override_export_symbols: None,
1516 merge_functions: MergeFunctions::Aliases,
1517 mcount: "mcount".to_string(),
1518 llvm_abiname: "".to_string(),
1519 relax_elf_relocations: false,
1521 use_ctors_section: false,
1522 eh_frame_header: true,
1523 has_thumb_interworking: false,
1524 split_debuginfo: SplitDebuginfo::Off,
1525 supported_sanitizers: SanitizerSet::empty(),
1526 default_adjusted_cabi: None,
1527 c_enum_min_bits: 32,
1528 generate_arange_section: true,
1529 supports_stack_protector: true,
1534 /// `TargetOptions` being a separate type is basically an implementation detail of `Target` that is
1535 /// used for providing defaults. Perhaps there's a way to merge `TargetOptions` into `Target` so
1536 /// this `Deref` implementation is no longer necessary.
1537 impl Deref for Target {
1538 type Target = TargetOptions;
1540 fn deref(&self) -> &Self::Target {
1544 impl DerefMut for Target {
1545 fn deref_mut(&mut self) -> &mut Self::Target {
1551 /// Given a function ABI, turn it into the correct ABI for this target.
1552 pub fn adjust_abi(&self, abi: Abi) -> Abi {
1554 Abi::C { .. } => self.default_adjusted_cabi.unwrap_or(abi),
1555 Abi::System { unwind } if self.is_like_windows && self.arch == "x86" => {
1556 Abi::Stdcall { unwind }
1558 Abi::System { unwind } => Abi::C { unwind },
1559 Abi::EfiApi if self.arch == "x86_64" => Abi::Win64,
1560 Abi::EfiApi => Abi::C { unwind: false },
1562 // See commentary in `is_abi_supported`.
1563 Abi::Stdcall { .. } | Abi::Thiscall { .. } if self.arch == "x86" => abi,
1564 Abi::Stdcall { unwind } | Abi::Thiscall { unwind } => Abi::C { unwind },
1565 Abi::Fastcall if self.arch == "x86" => abi,
1566 Abi::Vectorcall if ["x86", "x86_64"].contains(&&self.arch[..]) => abi,
1567 Abi::Fastcall | Abi::Vectorcall => Abi::C { unwind: false },
1573 /// Returns a None if the UNSUPPORTED_CALLING_CONVENTIONS lint should be emitted
1574 pub fn is_abi_supported(&self, abi: Abi) -> Option<bool> {
1586 X86Interrupt => ["x86", "x86_64"].contains(&&self.arch[..]),
1587 Aapcs => "arm" == self.arch,
1588 CCmseNonSecureCall => ["arm", "aarch64"].contains(&&self.arch[..]),
1589 Win64 | SysV64 => self.arch == "x86_64",
1590 PtxKernel => self.arch == "nvptx64",
1591 Msp430Interrupt => self.arch == "msp430",
1592 AmdGpuKernel => self.arch == "amdgcn",
1593 AvrInterrupt | AvrNonBlockingInterrupt => self.arch == "avr",
1594 Wasm => ["wasm32", "wasm64"].contains(&&self.arch[..]),
1595 Thiscall { .. } => self.arch == "x86",
1596 // On windows these fall-back to platform native calling convention (C) when the
1597 // architecture is not supported.
1599 // This is I believe a historical accident that has occurred as part of Microsoft
1600 // striving to allow most of the code to "just" compile when support for 64-bit x86
1601 // was added and then later again, when support for ARM architectures was added.
1603 // This is well documented across MSDN. Support for this in Rust has been added in
1604 // #54576. This makes much more sense in context of Microsoft's C++ than it does in
1605 // Rust, but there isn't much leeway remaining here to change it back at the time this
1606 // comment has been written.
1608 // Following are the relevant excerpts from the MSDN documentation.
1610 // > The __vectorcall calling convention is only supported in native code on x86 and
1611 // x64 processors that include Streaming SIMD Extensions 2 (SSE2) and above.
1613 // > On ARM machines, __vectorcall is accepted and ignored by the compiler.
1615 // -- https://docs.microsoft.com/en-us/cpp/cpp/vectorcall?view=msvc-160
1617 // > On ARM and x64 processors, __stdcall is accepted and ignored by the compiler;
1619 // -- https://docs.microsoft.com/en-us/cpp/cpp/stdcall?view=msvc-160
1621 // > In most cases, keywords or compiler switches that specify an unsupported
1622 // > convention on a particular platform are ignored, and the platform default
1623 // > convention is used.
1625 // -- https://docs.microsoft.com/en-us/cpp/cpp/argument-passing-and-naming-conventions
1626 Stdcall { .. } | Fastcall | Vectorcall if self.is_like_windows => true,
1627 // Outside of Windows we want to only support these calling conventions for the
1628 // architectures for which these calling conventions are actually well defined.
1629 Stdcall { .. } | Fastcall if self.arch == "x86" => true,
1630 Vectorcall if ["x86", "x86_64"].contains(&&self.arch[..]) => true,
1631 // Return a `None` for other cases so that we know to emit a future compat lint.
1632 Stdcall { .. } | Fastcall | Vectorcall => return None,
1636 /// Minimum integer size in bits that this target can perform atomic
1638 pub fn min_atomic_width(&self) -> u64 {
1639 self.min_atomic_width.unwrap_or(8)
1642 /// Maximum integer size in bits that this target can perform atomic
1644 pub fn max_atomic_width(&self) -> u64 {
1645 self.max_atomic_width.unwrap_or_else(|| self.pointer_width.into())
1648 /// Loads a target descriptor from a JSON object.
1649 pub fn from_json(mut obj: Json) -> Result<(Target, TargetWarnings), String> {
1650 // While ugly, this code must remain this way to retain
1651 // compatibility with existing JSON fields and the internal
1652 // expected naming of the Target and TargetOptions structs.
1653 // To ensure compatibility is retained, the built-in targets
1654 // are round-tripped through this code to catch cases where
1655 // the JSON parser is not updated to match the structs.
1657 let mut get_req_field = |name: &str| {
1658 obj.remove_key(name)
1659 .and_then(|j| Json::as_string(&j).map(str::to_string))
1660 .ok_or_else(|| format!("Field {} in target specification is required", name))
1663 let mut base = Target {
1664 llvm_target: get_req_field("llvm-target")?,
1665 pointer_width: get_req_field("target-pointer-width")?
1667 .map_err(|_| "target-pointer-width must be an integer".to_string())?,
1668 data_layout: get_req_field("data-layout")?,
1669 arch: get_req_field("arch")?,
1670 options: Default::default(),
1673 let mut incorrect_type = vec![];
1676 ($key_name:ident) => ( {
1677 let name = (stringify!($key_name)).replace("_", "-");
1678 if let Some(s) = obj.remove_key(&name).and_then(|j| Json::as_string(&j).map(str::to_string)) {
1682 ($key_name:ident = $json_name:expr) => ( {
1683 let name = $json_name;
1684 if let Some(s) = obj.remove_key(&name).and_then(|j| Json::as_string(&j).map(str::to_string)) {
1688 ($key_name:ident, bool) => ( {
1689 let name = (stringify!($key_name)).replace("_", "-");
1690 if let Some(s) = obj.remove_key(&name).and_then(|j| Json::as_boolean(&j)) {
1694 ($key_name:ident, u64) => ( {
1695 let name = (stringify!($key_name)).replace("_", "-");
1696 if let Some(s) = obj.remove_key(&name).and_then(|j| Json::as_u64(&j)) {
1700 ($key_name:ident, Option<u32>) => ( {
1701 let name = (stringify!($key_name)).replace("_", "-");
1702 if let Some(s) = obj.remove_key(&name).and_then(|j| Json::as_u64(&j)) {
1704 return Err("Not a valid DWARF version number".to_string());
1706 base.$key_name = Some(s as u32);
1709 ($key_name:ident, Option<u64>) => ( {
1710 let name = (stringify!($key_name)).replace("_", "-");
1711 if let Some(s) = obj.remove_key(&name).and_then(|j| Json::as_u64(&j)) {
1712 base.$key_name = Some(s);
1715 ($key_name:ident, MergeFunctions) => ( {
1716 let name = (stringify!($key_name)).replace("_", "-");
1717 obj.remove_key(&name[..]).and_then(|o| o.as_string().and_then(|s| {
1718 match s.parse::<MergeFunctions>() {
1719 Ok(mergefunc) => base.$key_name = mergefunc,
1720 _ => return Some(Err(format!("'{}' is not a valid value for \
1721 merge-functions. Use 'disabled', \
1722 'trampolines', or 'aliases'.",
1726 })).unwrap_or(Ok(()))
1728 ($key_name:ident, RelocModel) => ( {
1729 let name = (stringify!($key_name)).replace("_", "-");
1730 obj.remove_key(&name[..]).and_then(|o| o.as_string().and_then(|s| {
1731 match s.parse::<RelocModel>() {
1732 Ok(relocation_model) => base.$key_name = relocation_model,
1733 _ => return Some(Err(format!("'{}' is not a valid relocation model. \
1734 Run `rustc --print relocation-models` to \
1735 see the list of supported values.", s))),
1738 })).unwrap_or(Ok(()))
1740 ($key_name:ident, CodeModel) => ( {
1741 let name = (stringify!($key_name)).replace("_", "-");
1742 obj.remove_key(&name[..]).and_then(|o| o.as_string().and_then(|s| {
1743 match s.parse::<CodeModel>() {
1744 Ok(code_model) => base.$key_name = Some(code_model),
1745 _ => return Some(Err(format!("'{}' is not a valid code model. \
1746 Run `rustc --print code-models` to \
1747 see the list of supported values.", s))),
1750 })).unwrap_or(Ok(()))
1752 ($key_name:ident, TlsModel) => ( {
1753 let name = (stringify!($key_name)).replace("_", "-");
1754 obj.remove_key(&name[..]).and_then(|o| o.as_string().and_then(|s| {
1755 match s.parse::<TlsModel>() {
1756 Ok(tls_model) => base.$key_name = tls_model,
1757 _ => return Some(Err(format!("'{}' is not a valid TLS model. \
1758 Run `rustc --print tls-models` to \
1759 see the list of supported values.", s))),
1762 })).unwrap_or(Ok(()))
1764 ($key_name:ident, PanicStrategy) => ( {
1765 let name = (stringify!($key_name)).replace("_", "-");
1766 obj.remove_key(&name[..]).and_then(|o| o.as_string().and_then(|s| {
1768 "unwind" => base.$key_name = PanicStrategy::Unwind,
1769 "abort" => base.$key_name = PanicStrategy::Abort,
1770 _ => return Some(Err(format!("'{}' is not a valid value for \
1771 panic-strategy. Use 'unwind' or 'abort'.",
1775 })).unwrap_or(Ok(()))
1777 ($key_name:ident, RelroLevel) => ( {
1778 let name = (stringify!($key_name)).replace("_", "-");
1779 obj.remove_key(&name[..]).and_then(|o| o.as_string().and_then(|s| {
1780 match s.parse::<RelroLevel>() {
1781 Ok(level) => base.$key_name = level,
1782 _ => return Some(Err(format!("'{}' is not a valid value for \
1783 relro-level. Use 'full', 'partial, or 'off'.",
1787 })).unwrap_or(Ok(()))
1789 ($key_name:ident, SplitDebuginfo) => ( {
1790 let name = (stringify!($key_name)).replace("_", "-");
1791 obj.remove_key(&name[..]).and_then(|o| o.as_string().and_then(|s| {
1792 match s.parse::<SplitDebuginfo>() {
1793 Ok(level) => base.$key_name = level,
1794 _ => return Some(Err(format!("'{}' is not a valid value for \
1795 split-debuginfo. Use 'off' or 'dsymutil'.",
1799 })).unwrap_or(Ok(()))
1801 ($key_name:ident, list) => ( {
1802 let name = (stringify!($key_name)).replace("_", "-");
1803 if let Some(j) = obj.remove_key(&name){
1804 if let Some(v) = Json::as_array(&j) {
1805 base.$key_name = v.iter()
1806 .map(|a| a.as_string().unwrap().to_string())
1809 incorrect_type.push(name)
1813 ($key_name:ident, opt_list) => ( {
1814 let name = (stringify!($key_name)).replace("_", "-");
1815 if let Some(j) = obj.remove_key(&name) {
1816 if let Some(v) = Json::as_array(&j) {
1817 base.$key_name = Some(v.iter()
1818 .map(|a| a.as_string().unwrap().to_string())
1821 incorrect_type.push(name)
1825 ($key_name:ident, optional) => ( {
1826 let name = (stringify!($key_name)).replace("_", "-");
1827 if let Some(o) = obj.remove_key(&name[..]) {
1830 .map(|s| s.to_string() );
1833 ($key_name:ident, LldFlavor) => ( {
1834 let name = (stringify!($key_name)).replace("_", "-");
1835 obj.remove_key(&name[..]).and_then(|o| o.as_string().and_then(|s| {
1836 if let Some(flavor) = LldFlavor::from_str(&s) {
1837 base.$key_name = flavor;
1839 return Some(Err(format!(
1840 "'{}' is not a valid value for lld-flavor. \
1841 Use 'darwin', 'gnu', 'link' or 'wasm.",
1845 })).unwrap_or(Ok(()))
1847 ($key_name:ident, LinkerFlavor) => ( {
1848 let name = (stringify!($key_name)).replace("_", "-");
1849 obj.remove_key(&name[..]).and_then(|o| o.as_string().and_then(|s| {
1850 match LinkerFlavor::from_str(s) {
1851 Some(linker_flavor) => base.$key_name = linker_flavor,
1852 _ => return Some(Err(format!("'{}' is not a valid value for linker-flavor. \
1853 Use {}", s, LinkerFlavor::one_of()))),
1856 })).unwrap_or(Ok(()))
1858 ($key_name:ident, StackProbeType) => ( {
1859 let name = (stringify!($key_name)).replace("_", "-");
1860 obj.remove_key(&name[..]).and_then(|o| match StackProbeType::from_json(&o) {
1866 format!("`{:?}` is not a valid value for `{}`: {}", o, name, s)
1868 }).unwrap_or(Ok(()))
1870 ($key_name:ident, SanitizerSet) => ( {
1871 let name = (stringify!($key_name)).replace("_", "-");
1872 if let Some(o) = obj.remove_key(&name[..]) {
1873 if let Some(a) = o.as_array() {
1875 base.$key_name |= match s.as_string() {
1876 Some("address") => SanitizerSet::ADDRESS,
1877 Some("cfi") => SanitizerSet::CFI,
1878 Some("leak") => SanitizerSet::LEAK,
1879 Some("memory") => SanitizerSet::MEMORY,
1880 Some("thread") => SanitizerSet::THREAD,
1881 Some("hwaddress") => SanitizerSet::HWADDRESS,
1882 Some(s) => return Err(format!("unknown sanitizer {}", s)),
1883 _ => return Err(format!("not a string: {:?}", s)),
1887 incorrect_type.push(name)
1890 Ok::<(), String>(())
1893 ($key_name:ident, crt_objects_fallback) => ( {
1894 let name = (stringify!($key_name)).replace("_", "-");
1895 obj.remove_key(&name[..]).and_then(|o| o.as_string().and_then(|s| {
1896 match s.parse::<CrtObjectsFallback>() {
1897 Ok(fallback) => base.$key_name = Some(fallback),
1898 _ => return Some(Err(format!("'{}' is not a valid CRT objects fallback. \
1899 Use 'musl', 'mingw' or 'wasm'", s))),
1902 })).unwrap_or(Ok(()))
1904 ($key_name:ident, link_objects) => ( {
1905 let name = (stringify!($key_name)).replace("_", "-");
1906 if let Some(val) = obj.remove_key(&name[..]) {
1907 let obj = val.as_object().ok_or_else(|| format!("{}: expected a \
1908 JSON object with fields per CRT object kind.", name))?;
1909 let mut args = CrtObjects::new();
1911 let kind = LinkOutputKind::from_str(&k).ok_or_else(|| {
1912 format!("{}: '{}' is not a valid value for CRT object kind. \
1913 Use '(dynamic,static)-(nopic,pic)-exe' or \
1914 '(dynamic,static)-dylib' or 'wasi-reactor-exe'", name, k)
1917 let v = v.as_array().ok_or_else(||
1918 format!("{}.{}: expected a JSON array", name, k)
1919 )?.iter().enumerate()
1921 let s = s.as_string().ok_or_else(||
1922 format!("{}.{}[{}]: expected a JSON string", name, k, i))?;
1925 .collect::<Result<Vec<_>, String>>()?;
1927 args.insert(kind, v);
1929 base.$key_name = args;
1932 ($key_name:ident, link_args) => ( {
1933 let name = (stringify!($key_name)).replace("_", "-");
1934 if let Some(val) = obj.remove_key(&name[..]) {
1935 let obj = val.as_object().ok_or_else(|| format!("{}: expected a \
1936 JSON object with fields per linker-flavor.", name))?;
1937 let mut args = LinkArgs::new();
1939 let flavor = LinkerFlavor::from_str(&k).ok_or_else(|| {
1940 format!("{}: '{}' is not a valid value for linker-flavor. \
1941 Use 'em', 'gcc', 'ld' or 'msvc'", name, k)
1944 let v = v.as_array().ok_or_else(||
1945 format!("{}.{}: expected a JSON array", name, k)
1946 )?.iter().enumerate()
1948 let s = s.as_string().ok_or_else(||
1949 format!("{}.{}[{}]: expected a JSON string", name, k, i))?;
1952 .collect::<Result<Vec<_>, String>>()?;
1954 args.insert(flavor, v);
1956 base.$key_name = args;
1959 ($key_name:ident, env) => ( {
1960 let name = (stringify!($key_name)).replace("_", "-");
1961 if let Some(o) = obj.remove_key(&name[..]) {
1962 if let Some(a) = o.as_array() {
1964 if let Some(s) = o.as_string() {
1965 let p = s.split('=').collect::<Vec<_>>();
1967 let k = p[0].to_string();
1968 let v = p[1].to_string();
1969 base.$key_name.push((k, v));
1974 incorrect_type.push(name)
1978 ($key_name:ident, Option<Abi>) => ( {
1979 let name = (stringify!($key_name)).replace("_", "-");
1980 obj.remove_key(&name[..]).and_then(|o| o.as_string().and_then(|s| {
1981 match lookup_abi(s) {
1982 Some(abi) => base.$key_name = Some(abi),
1983 _ => return Some(Err(format!("'{}' is not a valid value for abi", s))),
1986 })).unwrap_or(Ok(()))
1988 ($key_name:ident, TargetFamilies) => ( {
1989 if let Some(value) = obj.remove_key("target-family") {
1990 if let Some(v) = Json::as_array(&value) {
1991 base.$key_name = v.iter()
1992 .map(|a| a.as_string().unwrap().to_string())
1994 } else if let Some(v) = Json::as_string(&value) {
1995 base.$key_name = vec![v.to_string()];
2001 if let Some(j) = obj.remove_key("target-endian") {
2002 if let Some(s) = Json::as_string(&j) {
2003 base.endian = s.parse()?;
2005 incorrect_type.push("target-endian".to_string())
2009 if let Some(fp) = obj.remove_key("frame-pointer") {
2010 if let Some(s) = Json::as_string(&fp) {
2011 base.frame_pointer = s
2013 .map_err(|()| format!("'{}' is not a valid value for frame-pointer", s))?;
2015 incorrect_type.push("frame-pointer".to_string())
2019 key!(is_builtin, bool);
2020 key!(c_int_width = "target-c-int-width");
2025 key!(linker_flavor, LinkerFlavor)?;
2026 key!(linker, optional);
2027 key!(lld_flavor, LldFlavor)?;
2028 key!(pre_link_objects, link_objects);
2029 key!(post_link_objects, link_objects);
2030 key!(pre_link_objects_fallback, link_objects);
2031 key!(post_link_objects_fallback, link_objects);
2032 key!(crt_objects_fallback, crt_objects_fallback)?;
2033 key!(pre_link_args, link_args);
2034 key!(late_link_args, link_args);
2035 key!(late_link_args_dynamic, link_args);
2036 key!(late_link_args_static, link_args);
2037 key!(post_link_args, link_args);
2038 key!(link_script, optional);
2039 key!(link_env, env);
2040 key!(link_env_remove, list);
2041 key!(asm_args, list);
2044 key!(dynamic_linking, bool);
2045 key!(only_cdylib, bool);
2046 key!(executables, bool);
2047 key!(relocation_model, RelocModel)?;
2048 key!(code_model, CodeModel)?;
2049 key!(tls_model, TlsModel)?;
2050 key!(disable_redzone, bool);
2051 key!(function_sections, bool);
2055 key!(staticlib_prefix);
2056 key!(staticlib_suffix);
2057 key!(families, TargetFamilies);
2058 key!(abi_return_struct_as_int, bool);
2059 key!(is_like_osx, bool);
2060 key!(is_like_solaris, bool);
2061 key!(is_like_windows, bool);
2062 key!(is_like_msvc, bool);
2063 key!(is_like_emscripten, bool);
2064 key!(is_like_fuchsia, bool);
2065 key!(is_like_wasm, bool);
2066 key!(dwarf_version, Option<u32>);
2067 key!(linker_is_gnu, bool);
2068 key!(allows_weak_linkage, bool);
2069 key!(has_rpath, bool);
2070 key!(no_default_libraries, bool);
2071 key!(position_independent_executables, bool);
2072 key!(static_position_independent_executables, bool);
2073 key!(needs_plt, bool);
2074 key!(relro_level, RelroLevel)?;
2075 key!(archive_format);
2076 key!(allow_asm, bool);
2077 key!(main_needs_argc_argv, bool);
2078 key!(has_thread_local, bool);
2079 key!(obj_is_bitcode, bool);
2080 key!(forces_embed_bitcode, bool);
2081 key!(bitcode_llvm_cmdline);
2082 key!(max_atomic_width, Option<u64>);
2083 key!(min_atomic_width, Option<u64>);
2084 key!(atomic_cas, bool);
2085 key!(panic_strategy, PanicStrategy)?;
2086 key!(crt_static_allows_dylibs, bool);
2087 key!(crt_static_default, bool);
2088 key!(crt_static_respected, bool);
2089 key!(stack_probes, StackProbeType)?;
2090 key!(min_global_align, Option<u64>);
2091 key!(default_codegen_units, Option<u64>);
2092 key!(trap_unreachable, bool);
2093 key!(requires_lto, bool);
2094 key!(singlethread, bool);
2095 key!(no_builtins, bool);
2096 key!(default_hidden_visibility, bool);
2097 key!(emit_debug_gdb_scripts, bool);
2098 key!(requires_uwtable, bool);
2099 key!(default_uwtable, bool);
2100 key!(simd_types_indirect, bool);
2101 key!(limit_rdylib_exports, bool);
2102 key!(override_export_symbols, opt_list);
2103 key!(merge_functions, MergeFunctions)?;
2104 key!(mcount = "target-mcount");
2106 key!(relax_elf_relocations, bool);
2107 key!(llvm_args, list);
2108 key!(use_ctors_section, bool);
2109 key!(eh_frame_header, bool);
2110 key!(has_thumb_interworking, bool);
2111 key!(split_debuginfo, SplitDebuginfo)?;
2112 key!(supported_sanitizers, SanitizerSet)?;
2113 key!(default_adjusted_cabi, Option<Abi>)?;
2114 key!(c_enum_min_bits, u64);
2115 key!(generate_arange_section, bool);
2116 key!(supports_stack_protector, bool);
2118 if base.is_builtin {
2119 // This can cause unfortunate ICEs later down the line.
2120 return Err("may not set is_builtin for targets not built-in".to_string());
2122 // Each field should have been read using `Json::remove_key` so any keys remaining are unused.
2123 let remaining_keys = obj.as_object().ok_or("Expected JSON object for target")?.keys();
2126 TargetWarnings { unused_fields: remaining_keys.cloned().collect(), incorrect_type },
2130 /// Search for a JSON file specifying the given target triple.
2132 /// If none is found in `$RUST_TARGET_PATH`, look for a file called `target.json` inside the
2133 /// sysroot under the target-triple's `rustlib` directory. Note that it could also just be a
2134 /// bare filename already, so also check for that. If one of the hardcoded targets we know
2135 /// about, just return it directly.
2137 /// The error string could come from any of the APIs called, including filesystem access and
2140 target_triple: &TargetTriple,
2142 ) -> Result<(Target, TargetWarnings), String> {
2143 use rustc_serialize::json;
2147 fn load_file(path: &Path) -> Result<(Target, TargetWarnings), String> {
2148 let contents = fs::read(path).map_err(|e| e.to_string())?;
2149 let obj = json::from_reader(&mut &contents[..]).map_err(|e| e.to_string())?;
2150 Target::from_json(obj)
2153 match *target_triple {
2154 TargetTriple::TargetTriple(ref target_triple) => {
2155 // check if triple is in list of built-in targets
2156 if let Some(t) = load_builtin(target_triple) {
2157 return Ok((t, TargetWarnings::empty()));
2160 // search for a file named `target_triple`.json in RUST_TARGET_PATH
2162 let mut target = target_triple.to_string();
2163 target.push_str(".json");
2164 PathBuf::from(target)
2167 let target_path = env::var_os("RUST_TARGET_PATH").unwrap_or_default();
2169 for dir in env::split_paths(&target_path) {
2170 let p = dir.join(&path);
2172 return load_file(&p);
2176 // Additionally look in the sysroot under `lib/rustlib/<triple>/target.json`
2178 let rustlib_path = crate::target_rustlib_path(&sysroot, &target_triple);
2179 let p = PathBuf::from_iter([
2181 Path::new(&rustlib_path),
2182 Path::new("target.json"),
2185 return load_file(&p);
2188 Err(format!("Could not find specification for target {:?}", target_triple))
2190 TargetTriple::TargetPath(ref target_path) => {
2191 if target_path.is_file() {
2192 return load_file(&target_path);
2194 Err(format!("Target path {:?} is not a valid file", target_path))
2200 impl ToJson for Target {
2201 fn to_json(&self) -> Json {
2202 let mut d = BTreeMap::new();
2203 let default: TargetOptions = Default::default();
2205 macro_rules! target_val {
2207 let name = (stringify!($attr)).replace("_", "-");
2208 d.insert(name, self.$attr.to_json());
2210 ($attr:ident, $key_name:expr) => {{
2211 let name = $key_name;
2212 d.insert(name.to_string(), self.$attr.to_json());
2216 macro_rules! target_option_val {
2218 let name = (stringify!($attr)).replace("_", "-");
2219 if default.$attr != self.$attr {
2220 d.insert(name, self.$attr.to_json());
2223 ($attr:ident, $key_name:expr) => {{
2224 let name = $key_name;
2225 if default.$attr != self.$attr {
2226 d.insert(name.to_string(), self.$attr.to_json());
2229 (link_args - $attr:ident) => {{
2230 let name = (stringify!($attr)).replace("_", "-");
2231 if default.$attr != self.$attr {
2235 .map(|(k, v)| (k.desc().to_owned(), v.clone()))
2236 .collect::<BTreeMap<_, _>>();
2237 d.insert(name, obj.to_json());
2240 (env - $attr:ident) => {{
2241 let name = (stringify!($attr)).replace("_", "-");
2242 if default.$attr != self.$attr {
2246 .map(|&(ref k, ref v)| k.clone() + "=" + &v)
2247 .collect::<Vec<_>>();
2248 d.insert(name, obj.to_json());
2253 target_val!(llvm_target);
2254 d.insert("target-pointer-width".to_string(), self.pointer_width.to_string().to_json());
2256 target_val!(data_layout);
2258 target_option_val!(is_builtin);
2259 target_option_val!(endian, "target-endian");
2260 target_option_val!(c_int_width, "target-c-int-width");
2261 target_option_val!(os);
2262 target_option_val!(env);
2263 target_option_val!(abi);
2264 target_option_val!(vendor);
2265 target_option_val!(linker_flavor);
2266 target_option_val!(linker);
2267 target_option_val!(lld_flavor);
2268 target_option_val!(pre_link_objects);
2269 target_option_val!(post_link_objects);
2270 target_option_val!(pre_link_objects_fallback);
2271 target_option_val!(post_link_objects_fallback);
2272 target_option_val!(crt_objects_fallback);
2273 target_option_val!(link_args - pre_link_args);
2274 target_option_val!(link_args - late_link_args);
2275 target_option_val!(link_args - late_link_args_dynamic);
2276 target_option_val!(link_args - late_link_args_static);
2277 target_option_val!(link_args - post_link_args);
2278 target_option_val!(link_script);
2279 target_option_val!(env - link_env);
2280 target_option_val!(link_env_remove);
2281 target_option_val!(asm_args);
2282 target_option_val!(cpu);
2283 target_option_val!(features);
2284 target_option_val!(dynamic_linking);
2285 target_option_val!(only_cdylib);
2286 target_option_val!(executables);
2287 target_option_val!(relocation_model);
2288 target_option_val!(code_model);
2289 target_option_val!(tls_model);
2290 target_option_val!(disable_redzone);
2291 target_option_val!(frame_pointer);
2292 target_option_val!(function_sections);
2293 target_option_val!(dll_prefix);
2294 target_option_val!(dll_suffix);
2295 target_option_val!(exe_suffix);
2296 target_option_val!(staticlib_prefix);
2297 target_option_val!(staticlib_suffix);
2298 target_option_val!(families, "target-family");
2299 target_option_val!(abi_return_struct_as_int);
2300 target_option_val!(is_like_osx);
2301 target_option_val!(is_like_solaris);
2302 target_option_val!(is_like_windows);
2303 target_option_val!(is_like_msvc);
2304 target_option_val!(is_like_emscripten);
2305 target_option_val!(is_like_fuchsia);
2306 target_option_val!(is_like_wasm);
2307 target_option_val!(dwarf_version);
2308 target_option_val!(linker_is_gnu);
2309 target_option_val!(allows_weak_linkage);
2310 target_option_val!(has_rpath);
2311 target_option_val!(no_default_libraries);
2312 target_option_val!(position_independent_executables);
2313 target_option_val!(static_position_independent_executables);
2314 target_option_val!(needs_plt);
2315 target_option_val!(relro_level);
2316 target_option_val!(archive_format);
2317 target_option_val!(allow_asm);
2318 target_option_val!(main_needs_argc_argv);
2319 target_option_val!(has_thread_local);
2320 target_option_val!(obj_is_bitcode);
2321 target_option_val!(forces_embed_bitcode);
2322 target_option_val!(bitcode_llvm_cmdline);
2323 target_option_val!(min_atomic_width);
2324 target_option_val!(max_atomic_width);
2325 target_option_val!(atomic_cas);
2326 target_option_val!(panic_strategy);
2327 target_option_val!(crt_static_allows_dylibs);
2328 target_option_val!(crt_static_default);
2329 target_option_val!(crt_static_respected);
2330 target_option_val!(stack_probes);
2331 target_option_val!(min_global_align);
2332 target_option_val!(default_codegen_units);
2333 target_option_val!(trap_unreachable);
2334 target_option_val!(requires_lto);
2335 target_option_val!(singlethread);
2336 target_option_val!(no_builtins);
2337 target_option_val!(default_hidden_visibility);
2338 target_option_val!(emit_debug_gdb_scripts);
2339 target_option_val!(requires_uwtable);
2340 target_option_val!(default_uwtable);
2341 target_option_val!(simd_types_indirect);
2342 target_option_val!(limit_rdylib_exports);
2343 target_option_val!(override_export_symbols);
2344 target_option_val!(merge_functions);
2345 target_option_val!(mcount, "target-mcount");
2346 target_option_val!(llvm_abiname);
2347 target_option_val!(relax_elf_relocations);
2348 target_option_val!(llvm_args);
2349 target_option_val!(use_ctors_section);
2350 target_option_val!(eh_frame_header);
2351 target_option_val!(has_thumb_interworking);
2352 target_option_val!(split_debuginfo);
2353 target_option_val!(supported_sanitizers);
2354 target_option_val!(c_enum_min_bits);
2355 target_option_val!(generate_arange_section);
2356 target_option_val!(supports_stack_protector);
2358 if let Some(abi) = self.default_adjusted_cabi {
2359 d.insert("default-adjusted-cabi".to_string(), Abi::name(abi).to_json());
2366 /// Either a target triple string or a path to a JSON file.
2367 #[derive(PartialEq, Clone, Debug, Hash, Encodable, Decodable)]
2368 pub enum TargetTriple {
2369 TargetTriple(String),
2370 TargetPath(PathBuf),
2374 /// Creates a target triple from the passed target triple string.
2375 pub fn from_triple(triple: &str) -> Self {
2376 TargetTriple::TargetTriple(triple.to_string())
2379 /// Creates a target triple from the passed target path.
2380 pub fn from_path(path: &Path) -> Result<Self, io::Error> {
2381 let canonicalized_path = path.canonicalize()?;
2382 Ok(TargetTriple::TargetPath(canonicalized_path))
2385 /// Returns a string triple for this target.
2387 /// If this target is a path, the file name (without extension) is returned.
2388 pub fn triple(&self) -> &str {
2390 TargetTriple::TargetTriple(ref triple) => triple,
2391 TargetTriple::TargetPath(ref path) => path
2393 .expect("target path must not be empty")
2395 .expect("target path must be valid unicode"),
2399 /// Returns an extended string triple for this target.
2401 /// If this target is a path, a hash of the path is appended to the triple returned
2403 pub fn debug_triple(&self) -> String {
2404 use std::collections::hash_map::DefaultHasher;
2405 use std::hash::{Hash, Hasher};
2407 let triple = self.triple();
2408 if let TargetTriple::TargetPath(ref path) = *self {
2409 let mut hasher = DefaultHasher::new();
2410 path.hash(&mut hasher);
2411 let hash = hasher.finish();
2412 format!("{}-{}", triple, hash)
2419 impl fmt::Display for TargetTriple {
2420 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
2421 write!(f, "{}", self.debug_triple())