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](http://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 serialize::json::{Json, ToJson};
38 use std::collections::BTreeMap;
39 use std::default::Default;
41 use std::path::{Path, PathBuf};
42 use std::str::FromStr;
43 use crate::spec::abi::{Abi, lookup as lookup_abi};
63 mod windows_msvc_base;
70 #[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd, Hash,
71 RustcEncodable, RustcDecodable)]
72 pub enum LinkerFlavor {
81 #[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd, Hash,
82 RustcEncodable, RustcDecodable)]
91 fn from_str(s: &str) -> Option<Self> {
93 "darwin" => LldFlavor::Ld64,
94 "gnu" => LldFlavor::Ld,
95 "link" => LldFlavor::Link,
96 "wasm" => LldFlavor::Wasm,
102 impl ToJson for LldFlavor {
103 fn to_json(&self) -> Json {
105 LldFlavor::Ld64 => "darwin",
106 LldFlavor::Ld => "gnu",
107 LldFlavor::Link => "link",
108 LldFlavor::Wasm => "wasm",
113 impl ToJson for LinkerFlavor {
114 fn to_json(&self) -> Json {
115 self.desc().to_json()
118 macro_rules! flavor_mappings {
119 ($((($($flavor:tt)*), $string:expr),)*) => (
121 pub const fn one_of() -> &'static str {
122 concat!("one of: ", $($string, " ",)+)
125 pub fn from_str(s: &str) -> Option<Self> {
127 $($string => $($flavor)*,)+
132 pub fn desc(&self) -> &str {
134 $($($flavor)* => $string,)+
143 ((LinkerFlavor::Em), "em"),
144 ((LinkerFlavor::Gcc), "gcc"),
145 ((LinkerFlavor::Ld), "ld"),
146 ((LinkerFlavor::Msvc), "msvc"),
147 ((LinkerFlavor::PtxLinker), "ptx-linker"),
148 ((LinkerFlavor::Lld(LldFlavor::Wasm)), "wasm-ld"),
149 ((LinkerFlavor::Lld(LldFlavor::Ld64)), "ld64.lld"),
150 ((LinkerFlavor::Lld(LldFlavor::Ld)), "ld.lld"),
151 ((LinkerFlavor::Lld(LldFlavor::Link)), "lld-link"),
154 #[derive(Clone, Copy, Debug, PartialEq, Hash, RustcEncodable, RustcDecodable)]
155 pub enum PanicStrategy {
161 pub fn desc(&self) -> &str {
163 PanicStrategy::Unwind => "unwind",
164 PanicStrategy::Abort => "abort",
169 impl ToJson for PanicStrategy {
170 fn to_json(&self) -> Json {
172 PanicStrategy::Abort => "abort".to_json(),
173 PanicStrategy::Unwind => "unwind".to_json(),
178 #[derive(Clone, Copy, Debug, PartialEq, Hash, RustcEncodable, RustcDecodable)]
179 pub enum RelroLevel {
187 pub fn desc(&self) -> &str {
189 RelroLevel::Full => "full",
190 RelroLevel::Partial => "partial",
191 RelroLevel::Off => "off",
192 RelroLevel::None => "none",
197 impl FromStr for RelroLevel {
200 fn from_str(s: &str) -> Result<RelroLevel, ()> {
202 "full" => Ok(RelroLevel::Full),
203 "partial" => Ok(RelroLevel::Partial),
204 "off" => Ok(RelroLevel::Off),
205 "none" => Ok(RelroLevel::None),
211 impl ToJson for RelroLevel {
212 fn to_json(&self) -> Json {
214 RelroLevel::Full => "full".to_json(),
215 RelroLevel::Partial => "partial".to_json(),
216 RelroLevel::Off => "off".to_json(),
217 RelroLevel::None => "None".to_json(),
222 #[derive(Clone, Copy, Debug, PartialEq, Hash, RustcEncodable, RustcDecodable)]
223 pub enum MergeFunctions {
229 impl MergeFunctions {
230 pub fn desc(&self) -> &str {
232 MergeFunctions::Disabled => "disabled",
233 MergeFunctions::Trampolines => "trampolines",
234 MergeFunctions::Aliases => "aliases",
239 impl FromStr for MergeFunctions {
242 fn from_str(s: &str) -> Result<MergeFunctions, ()> {
244 "disabled" => Ok(MergeFunctions::Disabled),
245 "trampolines" => Ok(MergeFunctions::Trampolines),
246 "aliases" => Ok(MergeFunctions::Aliases),
252 impl ToJson for MergeFunctions {
253 fn to_json(&self) -> Json {
255 MergeFunctions::Disabled => "disabled".to_json(),
256 MergeFunctions::Trampolines => "trampolines".to_json(),
257 MergeFunctions::Aliases => "aliases".to_json(),
262 pub enum LoadTargetError {
263 BuiltinTargetNotFound(String),
267 pub type LinkArgs = BTreeMap<LinkerFlavor, Vec<String>>;
268 pub type TargetResult = Result<Target, String>;
270 macro_rules! supported_targets {
271 ( $(($triple:expr, $module:ident),)+ ) => (
274 /// List of supported targets
275 const TARGETS: &[&str] = &[$($triple),*];
277 fn load_specific(target: &str) -> Result<Target, LoadTargetError> {
281 let mut t = $module::target()
282 .map_err(LoadTargetError::Other)?;
283 t.options.is_builtin = true;
285 // round-trip through the JSON parser to ensure at
286 // run-time that the parser works correctly
287 t = Target::from_json(t.to_json())
288 .map_err(LoadTargetError::Other)?;
289 debug!("Got builtin target: {:?}", t);
293 _ => Err(LoadTargetError::BuiltinTargetNotFound(
294 format!("Unable to find target: {}", target)))
298 pub fn get_targets() -> impl Iterator<Item = String> {
299 TARGETS.iter().filter_map(|t| -> Option<String> {
301 .and(Ok(t.to_string()))
307 mod test_json_encode_decode {
308 use serialize::json::ToJson;
310 $(use super::$module;)*
315 // Grab the TargetResult struct. If we successfully retrieved
316 // a Target, then the test JSON encoding/decoding can run for this
317 // Target on this testing platform (i.e., checking the iOS targets
318 // only on a Mac test platform).
319 let _ = $module::target().map(|original| {
320 let as_json = original.to_json();
321 let parsed = Target::from_json(as_json).unwrap();
322 assert_eq!(original, parsed);
331 ("x86_64-unknown-linux-gnu", x86_64_unknown_linux_gnu),
332 ("x86_64-unknown-linux-gnux32", x86_64_unknown_linux_gnux32),
333 ("i686-unknown-linux-gnu", i686_unknown_linux_gnu),
334 ("i586-unknown-linux-gnu", i586_unknown_linux_gnu),
335 ("mips-unknown-linux-gnu", mips_unknown_linux_gnu),
336 ("mips64-unknown-linux-gnuabi64", mips64_unknown_linux_gnuabi64),
337 ("mips64el-unknown-linux-gnuabi64", mips64el_unknown_linux_gnuabi64),
338 ("mipsel-unknown-linux-gnu", mipsel_unknown_linux_gnu),
339 ("powerpc-unknown-linux-gnu", powerpc_unknown_linux_gnu),
340 ("powerpc-unknown-linux-gnuspe", powerpc_unknown_linux_gnuspe),
341 ("powerpc-unknown-linux-musl", powerpc_unknown_linux_musl),
342 ("powerpc64-unknown-linux-gnu", powerpc64_unknown_linux_gnu),
343 ("powerpc64-unknown-linux-musl", powerpc64_unknown_linux_musl),
344 ("powerpc64le-unknown-linux-gnu", powerpc64le_unknown_linux_gnu),
345 ("powerpc64le-unknown-linux-musl", powerpc64le_unknown_linux_musl),
346 ("s390x-unknown-linux-gnu", s390x_unknown_linux_gnu),
347 ("sparc-unknown-linux-gnu", sparc_unknown_linux_gnu),
348 ("sparc64-unknown-linux-gnu", sparc64_unknown_linux_gnu),
349 ("arm-unknown-linux-gnueabi", arm_unknown_linux_gnueabi),
350 ("arm-unknown-linux-gnueabihf", arm_unknown_linux_gnueabihf),
351 ("arm-unknown-linux-musleabi", arm_unknown_linux_musleabi),
352 ("arm-unknown-linux-musleabihf", arm_unknown_linux_musleabihf),
353 ("armv4t-unknown-linux-gnueabi", armv4t_unknown_linux_gnueabi),
354 ("armv5te-unknown-linux-gnueabi", armv5te_unknown_linux_gnueabi),
355 ("armv5te-unknown-linux-musleabi", armv5te_unknown_linux_musleabi),
356 ("armv7-unknown-linux-gnueabihf", armv7_unknown_linux_gnueabihf),
357 ("thumbv7neon-unknown-linux-gnueabihf", thumbv7neon_unknown_linux_gnueabihf),
358 ("armv7-unknown-linux-musleabihf", armv7_unknown_linux_musleabihf),
359 ("aarch64-unknown-linux-gnu", aarch64_unknown_linux_gnu),
361 ("aarch64-unknown-linux-musl", aarch64_unknown_linux_musl),
362 ("x86_64-unknown-linux-musl", x86_64_unknown_linux_musl),
363 ("i686-unknown-linux-musl", i686_unknown_linux_musl),
364 ("i586-unknown-linux-musl", i586_unknown_linux_musl),
365 ("mips-unknown-linux-musl", mips_unknown_linux_musl),
366 ("mipsel-unknown-linux-musl", mipsel_unknown_linux_musl),
368 ("mips-unknown-linux-uclibc", mips_unknown_linux_uclibc),
369 ("mipsel-unknown-linux-uclibc", mipsel_unknown_linux_uclibc),
371 ("i686-linux-android", i686_linux_android),
372 ("x86_64-linux-android", x86_64_linux_android),
373 ("arm-linux-androideabi", arm_linux_androideabi),
374 ("armv7-linux-androideabi", armv7_linux_androideabi),
375 ("thumbv7neon-linux-androideabi", thumbv7neon_linux_androideabi),
376 ("aarch64-linux-android", aarch64_linux_android),
378 ("aarch64-unknown-freebsd", aarch64_unknown_freebsd),
379 ("i686-unknown-freebsd", i686_unknown_freebsd),
380 ("powerpc64-unknown-freebsd", powerpc64_unknown_freebsd),
381 ("x86_64-unknown-freebsd", x86_64_unknown_freebsd),
383 ("i686-unknown-dragonfly", i686_unknown_dragonfly),
384 ("x86_64-unknown-dragonfly", x86_64_unknown_dragonfly),
386 ("x86_64-unknown-bitrig", x86_64_unknown_bitrig),
388 ("aarch64-unknown-openbsd", aarch64_unknown_openbsd),
389 ("i686-unknown-openbsd", i686_unknown_openbsd),
390 ("x86_64-unknown-openbsd", x86_64_unknown_openbsd),
392 ("aarch64-unknown-netbsd", aarch64_unknown_netbsd),
393 ("armv6-unknown-netbsd-eabihf", armv6_unknown_netbsd_eabihf),
394 ("armv7-unknown-netbsd-eabihf", armv7_unknown_netbsd_eabihf),
395 ("i686-unknown-netbsd", i686_unknown_netbsd),
396 ("powerpc-unknown-netbsd", powerpc_unknown_netbsd),
397 ("sparc64-unknown-netbsd", sparc64_unknown_netbsd),
398 ("x86_64-unknown-netbsd", x86_64_unknown_netbsd),
399 ("x86_64-rumprun-netbsd", x86_64_rumprun_netbsd),
401 ("i686-unknown-haiku", i686_unknown_haiku),
402 ("x86_64-unknown-haiku", x86_64_unknown_haiku),
404 ("x86_64-apple-darwin", x86_64_apple_darwin),
405 ("i686-apple-darwin", i686_apple_darwin),
407 ("aarch64-fuchsia", aarch64_fuchsia),
408 ("x86_64-fuchsia", x86_64_fuchsia),
410 ("x86_64-unknown-l4re-uclibc", x86_64_unknown_l4re_uclibc),
412 ("x86_64-unknown-redox", x86_64_unknown_redox),
414 ("i386-apple-ios", i386_apple_ios),
415 ("x86_64-apple-ios", x86_64_apple_ios),
416 ("aarch64-apple-ios", aarch64_apple_ios),
417 ("armv7-apple-ios", armv7_apple_ios),
418 ("armv7s-apple-ios", armv7s_apple_ios),
420 ("armebv7r-none-eabi", armebv7r_none_eabi),
421 ("armebv7r-none-eabihf", armebv7r_none_eabihf),
422 ("armv7r-none-eabi", armv7r_none_eabi),
423 ("armv7r-none-eabihf", armv7r_none_eabihf),
425 ("x86_64-sun-solaris", x86_64_sun_solaris),
426 ("sparcv9-sun-solaris", sparcv9_sun_solaris),
428 ("x86_64-pc-windows-gnu", x86_64_pc_windows_gnu),
429 ("i686-pc-windows-gnu", i686_pc_windows_gnu),
431 ("aarch64-pc-windows-msvc", aarch64_pc_windows_msvc),
432 ("x86_64-pc-windows-msvc", x86_64_pc_windows_msvc),
433 ("i686-pc-windows-msvc", i686_pc_windows_msvc),
434 ("i586-pc-windows-msvc", i586_pc_windows_msvc),
435 ("thumbv7a-pc-windows-msvc", thumbv7a_pc_windows_msvc),
437 ("asmjs-unknown-emscripten", asmjs_unknown_emscripten),
438 ("wasm32-unknown-emscripten", wasm32_unknown_emscripten),
439 ("wasm32-unknown-unknown", wasm32_unknown_unknown),
440 ("wasm32-experimental-emscripten", wasm32_experimental_emscripten),
442 ("thumbv6m-none-eabi", thumbv6m_none_eabi),
443 ("thumbv7m-none-eabi", thumbv7m_none_eabi),
444 ("thumbv7em-none-eabi", thumbv7em_none_eabi),
445 ("thumbv7em-none-eabihf", thumbv7em_none_eabihf),
446 ("thumbv8m.base-none-eabi", thumbv8m_base_none_eabi),
447 ("thumbv8m.main-none-eabi", thumbv8m_main_none_eabi),
448 ("thumbv8m.main-none-eabihf", thumbv8m_main_none_eabihf),
450 ("msp430-none-elf", msp430_none_elf),
452 ("aarch64-unknown-cloudabi", aarch64_unknown_cloudabi),
453 ("armv7-unknown-cloudabi-eabihf", armv7_unknown_cloudabi_eabihf),
454 ("i686-unknown-cloudabi", i686_unknown_cloudabi),
455 ("x86_64-unknown-cloudabi", x86_64_unknown_cloudabi),
457 ("aarch64-unknown-hermit", aarch64_unknown_hermit),
458 ("x86_64-unknown-hermit", x86_64_unknown_hermit),
460 ("riscv32imc-unknown-none-elf", riscv32imc_unknown_none_elf),
461 ("riscv32imac-unknown-none-elf", riscv32imac_unknown_none_elf),
462 ("riscv64imac-unknown-none-elf", riscv64imac_unknown_none_elf),
463 ("riscv64gc-unknown-none-elf", riscv64gc_unknown_none_elf),
465 ("aarch64-unknown-none", aarch64_unknown_none),
467 ("x86_64-fortanix-unknown-sgx", x86_64_fortanix_unknown_sgx),
469 ("x86_64-unknown-uefi", x86_64_unknown_uefi),
471 ("nvptx64-nvidia-cuda", nvptx64_nvidia_cuda),
474 /// Everything `rustc` knows about how to compile for a specific target.
476 /// Every field here must be specified, and has no default value.
477 #[derive(PartialEq, Clone, Debug)]
479 /// Target triple to pass to LLVM.
480 pub llvm_target: String,
481 /// String to use as the `target_endian` `cfg` variable.
482 pub target_endian: String,
483 /// String to use as the `target_pointer_width` `cfg` variable.
484 pub target_pointer_width: String,
485 /// Width of c_int type
486 pub target_c_int_width: String,
487 /// OS name to use for conditional compilation.
488 pub target_os: String,
489 /// Environment name to use for conditional compilation.
490 pub target_env: String,
491 /// Vendor name to use for conditional compilation.
492 pub target_vendor: String,
493 /// Architecture to use for ABI considerations. Valid options: "x86",
494 /// "x86_64", "arm", "aarch64", "mips", "powerpc", and "powerpc64".
496 /// [Data layout](http://llvm.org/docs/LangRef.html#data-layout) to pass to LLVM.
497 pub data_layout: String,
499 pub linker_flavor: LinkerFlavor,
500 /// Optional settings with defaults.
501 pub options: TargetOptions,
504 pub trait HasTargetSpec {
505 fn target_spec(&self) -> &Target;
508 impl HasTargetSpec for Target {
509 fn target_spec(&self) -> &Target {
514 /// Optional aspects of a target specification.
516 /// This has an implementation of `Default`, see each field for what the default is. In general,
517 /// these try to take "minimal defaults" that don't assume anything about the runtime they run in.
518 #[derive(PartialEq, Clone, Debug)]
519 pub struct TargetOptions {
520 /// Whether the target is built-in or loaded from a custom target specification.
521 pub is_builtin: bool,
524 pub linker: Option<String>,
527 pub lld_flavor: LldFlavor,
529 /// Linker arguments that are passed *before* any user-defined libraries.
530 pub pre_link_args: LinkArgs, // ... unconditionally
531 pub pre_link_args_crt: LinkArgs, // ... when linking with a bundled crt
532 /// Objects to link before all others, always found within the
534 pub pre_link_objects_exe: Vec<String>, // ... when linking an executable, unconditionally
535 pub pre_link_objects_exe_crt: Vec<String>, // ... when linking an executable with a bundled crt
536 pub pre_link_objects_dll: Vec<String>, // ... when linking a dylib
537 /// Linker arguments that are unconditionally passed after any
538 /// user-defined but before post_link_objects. Standard platform
539 /// libraries that should be always be linked to, usually go here.
540 pub late_link_args: LinkArgs,
541 /// Objects to link after all others, always found within the
543 pub post_link_objects: Vec<String>, // ... unconditionally
544 pub post_link_objects_crt: Vec<String>, // ... when linking with a bundled crt
545 /// Linker arguments that are unconditionally passed *after* any
546 /// user-defined libraries.
547 pub post_link_args: LinkArgs,
549 /// Environment variables to be set before invoking the linker.
550 pub link_env: Vec<(String, String)>,
552 /// Extra arguments to pass to the external assembler (when used)
553 pub asm_args: Vec<String>,
555 /// Default CPU to pass to LLVM. Corresponds to `llc -mcpu=$cpu`. Defaults
558 /// Default target features to pass to LLVM. These features will *always* be
559 /// passed, and cannot be disabled even via `-C`. Corresponds to `llc
560 /// -mattr=$features`.
561 pub features: String,
562 /// Whether dynamic linking is available on this target. Defaults to false.
563 pub dynamic_linking: bool,
564 /// If dynamic linking is available, whether only cdylibs are supported.
565 pub only_cdylib: bool,
566 /// Whether executables are available on this target. iOS, for example, only allows static
567 /// libraries. Defaults to false.
568 pub executables: bool,
569 /// Relocation model to use in object file. Corresponds to `llc
570 /// -relocation-model=$relocation_model`. Defaults to "pic".
571 pub relocation_model: String,
572 /// Code model to use. Corresponds to `llc -code-model=$code_model`.
573 pub code_model: Option<String>,
574 /// TLS model to use. Options are "global-dynamic" (default), "local-dynamic", "initial-exec"
575 /// and "local-exec". This is similar to the -ftls-model option in GCC/Clang.
576 pub tls_model: String,
577 /// Do not emit code that uses the "red zone", if the ABI has one. Defaults to false.
578 pub disable_redzone: bool,
579 /// Eliminate frame pointers from stack frames if possible. Defaults to true.
580 pub eliminate_frame_pointer: bool,
581 /// Emit each function in its own section. Defaults to true.
582 pub function_sections: bool,
583 /// String to prepend to the name of every dynamic library. Defaults to "lib".
584 pub dll_prefix: String,
585 /// String to append to the name of every dynamic library. Defaults to ".so".
586 pub dll_suffix: String,
587 /// String to append to the name of every executable.
588 pub exe_suffix: String,
589 /// String to prepend to the name of every static library. Defaults to "lib".
590 pub staticlib_prefix: String,
591 /// String to append to the name of every static library. Defaults to ".a".
592 pub staticlib_suffix: String,
593 /// OS family to use for conditional compilation. Valid options: "unix", "windows".
594 pub target_family: Option<String>,
595 /// Whether the target toolchain's ABI supports returning small structs as an integer.
596 pub abi_return_struct_as_int: bool,
597 /// Whether the target toolchain is like macOS's. Only useful for compiling against iOS/macOS,
598 /// in particular running dsymutil and some other stuff like `-dead_strip`. Defaults to false.
599 pub is_like_osx: bool,
600 /// Whether the target toolchain is like Solaris's.
601 /// Only useful for compiling against Illumos/Solaris,
602 /// as they have a different set of linker flags. Defaults to false.
603 pub is_like_solaris: bool,
604 /// Whether the target toolchain is like Windows'. Only useful for compiling against Windows,
605 /// only really used for figuring out how to find libraries, since Windows uses its own
606 /// library naming convention. Defaults to false.
607 pub is_like_windows: bool,
608 pub is_like_msvc: bool,
609 /// Whether the target toolchain is like Android's. Only useful for compiling against Android.
610 /// Defaults to false.
611 pub is_like_android: bool,
612 /// Whether the target toolchain is like Emscripten's. Only useful for compiling with
613 /// Emscripten toolchain.
614 /// Defaults to false.
615 pub is_like_emscripten: bool,
616 /// Whether the target toolchain is like Fuchsia's.
617 pub is_like_fuchsia: bool,
618 /// Whether the linker support GNU-like arguments such as -O. Defaults to false.
619 pub linker_is_gnu: bool,
620 /// The MinGW toolchain has a known issue that prevents it from correctly
621 /// handling COFF object files with more than 2<sup>15</sup> sections. Since each weak
622 /// symbol needs its own COMDAT section, weak linkage implies a large
623 /// number sections that easily exceeds the given limit for larger
624 /// codebases. Consequently we want a way to disallow weak linkage on some
626 pub allows_weak_linkage: bool,
627 /// Whether the linker support rpaths or not. Defaults to false.
629 /// Whether to disable linking to the default libraries, typically corresponds
630 /// to `-nodefaultlibs`. Defaults to true.
631 pub no_default_libraries: bool,
632 /// Dynamically linked executables can be compiled as position independent
633 /// if the default relocation model of position independent code is not
634 /// changed. This is a requirement to take advantage of ASLR, as otherwise
635 /// the functions in the executable are not randomized and can be used
636 /// during an exploit of a vulnerability in any code.
637 pub position_independent_executables: bool,
638 /// Determines if the target always requires using the PLT for indirect
639 /// library calls or not. This controls the default value of the `-Z plt` flag.
641 /// Either partial, full, or off. Full RELRO makes the dynamic linker
642 /// resolve all symbols at startup and marks the GOT read-only before
643 /// starting the program, preventing overwriting the GOT.
644 pub relro_level: RelroLevel,
645 /// Format that archives should be emitted in. This affects whether we use
646 /// LLVM to assemble an archive or fall back to the system linker, and
647 /// currently only "gnu" is used to fall into LLVM. Unknown strings cause
648 /// the system linker to be used.
649 pub archive_format: String,
650 /// Is asm!() allowed? Defaults to true.
652 /// Whether the target uses a custom unwind resumption routine.
653 /// By default LLVM lowers `resume` instructions into calls to `_Unwind_Resume`
654 /// defined in libgcc. If this option is enabled, the target must provide
655 /// `eh_unwind_resume` lang item.
656 pub custom_unwind_resume: bool,
658 /// Flag indicating whether ELF TLS (e.g., #[thread_local]) is available for
660 pub has_elf_tls: bool,
661 // This is mainly for easy compatibility with emscripten.
662 // If we give emcc .o files that are actually .bc files it
664 pub obj_is_bitcode: bool,
666 // LLVM can't produce object files for this target. Instead, we'll make LLVM
667 // emit assembly and then use `gcc` to turn that assembly into an object
669 pub no_integrated_as: bool,
671 /// Don't use this field; instead use the `.min_atomic_width()` method.
672 pub min_atomic_width: Option<u64>,
674 /// Don't use this field; instead use the `.max_atomic_width()` method.
675 pub max_atomic_width: Option<u64>,
677 /// Whether the target supports atomic CAS operations natively
678 pub atomic_cas: bool,
680 /// Panic strategy: "unwind" or "abort"
681 pub panic_strategy: PanicStrategy,
683 /// A blacklist of ABIs unsupported by the current target. Note that generic
684 /// ABIs are considered to be supported on all platforms and cannot be blacklisted.
685 pub abi_blacklist: Vec<Abi>,
687 /// Whether or not linking dylibs to a static CRT is allowed.
688 pub crt_static_allows_dylibs: bool,
689 /// Whether or not the CRT is statically linked by default.
690 pub crt_static_default: bool,
691 /// Whether or not crt-static is respected by the compiler (or is a no-op).
692 pub crt_static_respected: bool,
694 /// Whether or not stack probes (__rust_probestack) are enabled
695 pub stack_probes: bool,
697 /// The minimum alignment for global symbols.
698 pub min_global_align: Option<u64>,
700 /// Default number of codegen units to use in debug mode
701 pub default_codegen_units: Option<u64>,
703 /// Whether to generate trap instructions in places where optimization would
704 /// otherwise produce control flow that falls through into unrelated memory.
705 pub trap_unreachable: bool,
707 /// This target requires everything to be compiled with LTO to emit a final
708 /// executable, aka there is no native linker for this target.
709 pub requires_lto: bool,
711 /// This target has no support for threads.
712 pub singlethread: bool,
714 /// Whether library functions call lowering/optimization is disabled in LLVM
715 /// for this target unconditionally.
716 pub no_builtins: bool,
718 /// Whether to lower 128-bit operations to compiler_builtins calls. Use if
719 /// your backend only supports 64-bit and smaller math.
720 pub i128_lowering: bool,
722 /// The codegen backend to use for this target, typically "llvm"
723 pub codegen_backend: String,
725 /// The default visibility for symbols in this target should be "hidden"
726 /// rather than "default"
727 pub default_hidden_visibility: bool,
729 /// Whether or not bitcode is embedded in object files
730 pub embed_bitcode: bool,
732 /// Whether a .debug_gdb_scripts section will be added to the output object file
733 pub emit_debug_gdb_scripts: bool,
735 /// Whether or not to unconditionally `uwtable` attributes on functions,
736 /// typically because the platform needs to unwind for things like stack
738 pub requires_uwtable: bool,
740 /// Whether or not SIMD types are passed by reference in the Rust ABI,
741 /// typically required if a target can be compiled with a mixed set of
742 /// target features. This is `true` by default, and `false` for targets like
743 /// wasm32 where the whole program either has simd or not.
744 pub simd_types_indirect: bool,
746 /// If set, have the linker export exactly these symbols, instead of using
747 /// the usual logic to figure this out from the crate itself.
748 pub override_export_symbols: Option<Vec<String>>,
750 /// Determines how or whether the MergeFunctions LLVM pass should run for
751 /// this target. Either "disabled", "trampolines", or "aliases".
752 /// The MergeFunctions pass is generally useful, but some targets may need
753 /// to opt out. The default is "aliases".
755 /// Workaround for: https://github.com/rust-lang/rust/issues/57356
756 pub merge_functions: MergeFunctions
759 impl Default for TargetOptions {
760 /// Creates a set of "sane defaults" for any target. This is still
761 /// incomplete, and if used for compilation, will certainly not work.
762 fn default() -> TargetOptions {
765 linker: option_env!("CFG_DEFAULT_LINKER").map(|s| s.to_string()),
766 lld_flavor: LldFlavor::Ld,
767 pre_link_args: LinkArgs::new(),
768 pre_link_args_crt: LinkArgs::new(),
769 post_link_args: LinkArgs::new(),
770 asm_args: Vec::new(),
771 cpu: "generic".to_string(),
772 features: String::new(),
773 dynamic_linking: false,
776 relocation_model: "pic".to_string(),
778 tls_model: "global-dynamic".to_string(),
779 disable_redzone: false,
780 eliminate_frame_pointer: true,
781 function_sections: true,
782 dll_prefix: "lib".to_string(),
783 dll_suffix: ".so".to_string(),
784 exe_suffix: String::new(),
785 staticlib_prefix: "lib".to_string(),
786 staticlib_suffix: ".a".to_string(),
788 abi_return_struct_as_int: false,
790 is_like_solaris: false,
791 is_like_windows: false,
792 is_like_android: false,
793 is_like_emscripten: false,
795 is_like_fuchsia: false,
796 linker_is_gnu: false,
797 allows_weak_linkage: true,
799 no_default_libraries: true,
800 position_independent_executables: false,
802 relro_level: RelroLevel::None,
803 pre_link_objects_exe: Vec::new(),
804 pre_link_objects_exe_crt: Vec::new(),
805 pre_link_objects_dll: Vec::new(),
806 post_link_objects: Vec::new(),
807 post_link_objects_crt: Vec::new(),
808 late_link_args: LinkArgs::new(),
809 link_env: Vec::new(),
810 archive_format: "gnu".to_string(),
811 custom_unwind_resume: false,
814 obj_is_bitcode: false,
815 no_integrated_as: false,
816 min_atomic_width: None,
817 max_atomic_width: None,
819 panic_strategy: PanicStrategy::Unwind,
820 abi_blacklist: vec![],
821 crt_static_allows_dylibs: false,
822 crt_static_default: false,
823 crt_static_respected: false,
825 min_global_align: None,
826 default_codegen_units: None,
827 trap_unreachable: true,
831 i128_lowering: false,
832 codegen_backend: "llvm".to_string(),
833 default_hidden_visibility: false,
834 embed_bitcode: false,
835 emit_debug_gdb_scripts: true,
836 requires_uwtable: false,
837 simd_types_indirect: true,
838 override_export_symbols: None,
839 merge_functions: MergeFunctions::Aliases,
845 /// Given a function ABI, turn it into the correct ABI for this target.
846 pub fn adjust_abi(&self, abi: Abi) -> Abi {
849 if self.options.is_like_windows && self.arch == "x86" {
855 // These ABI kinds are ignored on non-x86 Windows targets.
856 // See https://docs.microsoft.com/en-us/cpp/cpp/argument-passing-and-naming-conventions
857 // and the individual pages for __stdcall et al.
858 Abi::Stdcall | Abi::Fastcall | Abi::Vectorcall | Abi::Thiscall => {
859 if self.options.is_like_windows && self.arch != "x86" {
869 /// Minimum integer size in bits that this target can perform atomic
871 pub fn min_atomic_width(&self) -> u64 {
872 self.options.min_atomic_width.unwrap_or(8)
875 /// Maximum integer size in bits that this target can perform atomic
877 pub fn max_atomic_width(&self) -> u64 {
878 self.options.max_atomic_width.unwrap_or_else(|| self.target_pointer_width.parse().unwrap())
881 pub fn is_abi_supported(&self, abi: Abi) -> bool {
882 abi.generic() || !self.options.abi_blacklist.contains(&abi)
885 /// Loads a target descriptor from a JSON object.
886 pub fn from_json(obj: Json) -> TargetResult {
887 // While ugly, this code must remain this way to retain
888 // compatibility with existing JSON fields and the internal
889 // expected naming of the Target and TargetOptions structs.
890 // To ensure compatibility is retained, the built-in targets
891 // are round-tripped through this code to catch cases where
892 // the JSON parser is not updated to match the structs.
894 let get_req_field = |name: &str| {
896 .map(|s| s.as_string())
897 .and_then(|os| os.map(|s| s.to_string()))
898 .ok_or_else(|| format!("Field {} in target specification is required", name))
901 let get_opt_field = |name: &str, default: &str| {
902 obj.find(name).and_then(|s| s.as_string())
903 .map(|s| s.to_string())
904 .unwrap_or_else(|| default.to_string())
907 let mut base = Target {
908 llvm_target: get_req_field("llvm-target")?,
909 target_endian: get_req_field("target-endian")?,
910 target_pointer_width: get_req_field("target-pointer-width")?,
911 target_c_int_width: get_req_field("target-c-int-width")?,
912 data_layout: get_req_field("data-layout")?,
913 arch: get_req_field("arch")?,
914 target_os: get_req_field("os")?,
915 target_env: get_opt_field("env", ""),
916 target_vendor: get_opt_field("vendor", "unknown"),
917 linker_flavor: LinkerFlavor::from_str(&*get_req_field("linker-flavor")?)
919 format!("linker flavor must be {}", LinkerFlavor::one_of())
921 options: Default::default(),
925 ($key_name:ident) => ( {
926 let name = (stringify!($key_name)).replace("_", "-");
927 obj.find(&name[..]).map(|o| o.as_string()
928 .map(|s| base.options.$key_name = s.to_string()));
930 ($key_name:ident, bool) => ( {
931 let name = (stringify!($key_name)).replace("_", "-");
933 .map(|o| o.as_boolean()
934 .map(|s| base.options.$key_name = s));
936 ($key_name:ident, Option<u64>) => ( {
937 let name = (stringify!($key_name)).replace("_", "-");
940 .map(|s| base.options.$key_name = Some(s)));
942 ($key_name:ident, MergeFunctions) => ( {
943 let name = (stringify!($key_name)).replace("_", "-");
944 obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
945 match s.parse::<MergeFunctions>() {
946 Ok(mergefunc) => base.options.$key_name = mergefunc,
947 _ => return Some(Err(format!("'{}' is not a valid value for \
948 merge-functions. Use 'disabled', \
949 'trampolines', or 'aliases'.",
953 })).unwrap_or(Ok(()))
955 ($key_name:ident, PanicStrategy) => ( {
956 let name = (stringify!($key_name)).replace("_", "-");
957 obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
959 "unwind" => base.options.$key_name = PanicStrategy::Unwind,
960 "abort" => base.options.$key_name = PanicStrategy::Abort,
961 _ => return Some(Err(format!("'{}' is not a valid value for \
962 panic-strategy. Use 'unwind' or 'abort'.",
966 })).unwrap_or(Ok(()))
968 ($key_name:ident, RelroLevel) => ( {
969 let name = (stringify!($key_name)).replace("_", "-");
970 obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
971 match s.parse::<RelroLevel>() {
972 Ok(level) => base.options.$key_name = level,
973 _ => return Some(Err(format!("'{}' is not a valid value for \
974 relro-level. Use 'full', 'partial, or 'off'.",
978 })).unwrap_or(Ok(()))
980 ($key_name:ident, list) => ( {
981 let name = (stringify!($key_name)).replace("_", "-");
982 obj.find(&name[..]).map(|o| o.as_array()
983 .map(|v| base.options.$key_name = v.iter()
984 .map(|a| a.as_string().unwrap().to_string()).collect()
988 ($key_name:ident, opt_list) => ( {
989 let name = (stringify!($key_name)).replace("_", "-");
990 obj.find(&name[..]).map(|o| o.as_array()
991 .map(|v| base.options.$key_name = Some(v.iter()
992 .map(|a| a.as_string().unwrap().to_string()).collect())
996 ($key_name:ident, optional) => ( {
997 let name = (stringify!($key_name)).replace("_", "-");
998 if let Some(o) = obj.find(&name[..]) {
999 base.options.$key_name = o
1001 .map(|s| s.to_string() );
1004 ($key_name:ident, LldFlavor) => ( {
1005 let name = (stringify!($key_name)).replace("_", "-");
1006 obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
1007 if let Some(flavor) = LldFlavor::from_str(&s) {
1008 base.options.$key_name = flavor;
1010 return Some(Err(format!(
1011 "'{}' is not a valid value for lld-flavor. \
1012 Use 'darwin', 'gnu', 'link' or 'wasm.",
1016 })).unwrap_or(Ok(()))
1018 ($key_name:ident, LinkerFlavor) => ( {
1019 let name = (stringify!($key_name)).replace("_", "-");
1020 obj.find(&name[..]).and_then(|o| o.as_string().map(|s| {
1021 LinkerFlavor::from_str(&s).ok_or_else(|| {
1022 Err(format!("'{}' is not a valid value for linker-flavor. \
1023 Use 'em', 'gcc', 'ld' or 'msvc.", s))
1025 })).unwrap_or(Ok(()))
1027 ($key_name:ident, link_args) => ( {
1028 let name = (stringify!($key_name)).replace("_", "-");
1029 if let Some(val) = obj.find(&name[..]) {
1030 let obj = val.as_object().ok_or_else(|| format!("{}: expected a \
1031 JSON object with fields per linker-flavor.", name))?;
1032 let mut args = LinkArgs::new();
1034 let flavor = LinkerFlavor::from_str(&k).ok_or_else(|| {
1035 format!("{}: '{}' is not a valid value for linker-flavor. \
1036 Use 'em', 'gcc', 'ld' or 'msvc'", name, k)
1039 let v = v.as_array().ok_or_else(||
1040 format!("{}.{}: expected a JSON array", name, k)
1041 )?.iter().enumerate()
1043 let s = s.as_string().ok_or_else(||
1044 format!("{}.{}[{}]: expected a JSON string", name, k, i))?;
1047 .collect::<Result<Vec<_>, String>>()?;
1049 args.insert(flavor, v);
1051 base.options.$key_name = args;
1054 ($key_name:ident, env) => ( {
1055 let name = (stringify!($key_name)).replace("_", "-");
1056 if let Some(a) = obj.find(&name[..]).and_then(|o| o.as_array()) {
1058 if let Some(s) = o.as_string() {
1059 let p = s.split('=').collect::<Vec<_>>();
1061 let k = p[0].to_string();
1062 let v = p[1].to_string();
1063 base.options.$key_name.push((k, v));
1071 key!(is_builtin, bool);
1072 key!(linker, optional);
1073 key!(lld_flavor, LldFlavor)?;
1074 key!(pre_link_args, link_args);
1075 key!(pre_link_args_crt, link_args);
1076 key!(pre_link_objects_exe, list);
1077 key!(pre_link_objects_exe_crt, list);
1078 key!(pre_link_objects_dll, list);
1079 key!(late_link_args, link_args);
1080 key!(post_link_objects, list);
1081 key!(post_link_objects_crt, list);
1082 key!(post_link_args, link_args);
1083 key!(link_env, env);
1084 key!(asm_args, list);
1087 key!(dynamic_linking, bool);
1088 key!(only_cdylib, bool);
1089 key!(executables, bool);
1090 key!(relocation_model);
1091 key!(code_model, optional);
1093 key!(disable_redzone, bool);
1094 key!(eliminate_frame_pointer, bool);
1095 key!(function_sections, bool);
1099 key!(staticlib_prefix);
1100 key!(staticlib_suffix);
1101 key!(target_family, optional);
1102 key!(abi_return_struct_as_int, bool);
1103 key!(is_like_osx, bool);
1104 key!(is_like_solaris, bool);
1105 key!(is_like_windows, bool);
1106 key!(is_like_msvc, bool);
1107 key!(is_like_emscripten, bool);
1108 key!(is_like_android, bool);
1109 key!(is_like_fuchsia, bool);
1110 key!(linker_is_gnu, bool);
1111 key!(allows_weak_linkage, bool);
1112 key!(has_rpath, bool);
1113 key!(no_default_libraries, bool);
1114 key!(position_independent_executables, bool);
1115 key!(needs_plt, bool);
1116 key!(relro_level, RelroLevel)?;
1117 key!(archive_format);
1118 key!(allow_asm, bool);
1119 key!(custom_unwind_resume, bool);
1120 key!(has_elf_tls, bool);
1121 key!(obj_is_bitcode, bool);
1122 key!(no_integrated_as, bool);
1123 key!(max_atomic_width, Option<u64>);
1124 key!(min_atomic_width, Option<u64>);
1125 key!(atomic_cas, bool);
1126 key!(panic_strategy, PanicStrategy)?;
1127 key!(crt_static_allows_dylibs, bool);
1128 key!(crt_static_default, bool);
1129 key!(crt_static_respected, bool);
1130 key!(stack_probes, bool);
1131 key!(min_global_align, Option<u64>);
1132 key!(default_codegen_units, Option<u64>);
1133 key!(trap_unreachable, bool);
1134 key!(requires_lto, bool);
1135 key!(singlethread, bool);
1136 key!(no_builtins, bool);
1137 key!(codegen_backend);
1138 key!(default_hidden_visibility, bool);
1139 key!(embed_bitcode, bool);
1140 key!(emit_debug_gdb_scripts, bool);
1141 key!(requires_uwtable, bool);
1142 key!(simd_types_indirect, bool);
1143 key!(override_export_symbols, opt_list);
1144 key!(merge_functions, MergeFunctions)?;
1146 if let Some(array) = obj.find("abi-blacklist").and_then(Json::as_array) {
1147 for name in array.iter().filter_map(|abi| abi.as_string()) {
1148 match lookup_abi(name) {
1151 return Err(format!("The ABI \"{}\" is considered to be supported on \
1152 all targets and cannot be blacklisted", abi))
1155 base.options.abi_blacklist.push(abi)
1157 None => return Err(format!("Unknown ABI \"{}\" in target specification", name))
1165 /// Search RUST_TARGET_PATH for a JSON file specifying the given target
1166 /// triple. Note that it could also just be a bare filename already, so also
1167 /// check for that. If one of the hardcoded targets we know about, just
1168 /// return it directly.
1170 /// The error string could come from any of the APIs called, including
1171 /// filesystem access and JSON decoding.
1172 pub fn search(target_triple: &TargetTriple) -> Result<Target, String> {
1175 use serialize::json;
1177 fn load_file(path: &Path) -> Result<Target, String> {
1178 let contents = fs::read(path).map_err(|e| e.to_string())?;
1179 let obj = json::from_reader(&mut &contents[..])
1180 .map_err(|e| e.to_string())?;
1181 Target::from_json(obj)
1184 match *target_triple {
1185 TargetTriple::TargetTriple(ref target_triple) => {
1186 // check if triple is in list of supported targets
1187 match load_specific(target_triple) {
1188 Ok(t) => return Ok(t),
1189 Err(LoadTargetError::BuiltinTargetNotFound(_)) => (),
1190 Err(LoadTargetError::Other(e)) => return Err(e),
1193 // search for a file named `target_triple`.json in RUST_TARGET_PATH
1195 let mut target = target_triple.to_string();
1196 target.push_str(".json");
1197 PathBuf::from(target)
1200 let target_path = env::var_os("RUST_TARGET_PATH").unwrap_or_default();
1202 // FIXME 16351: add a sane default search path?
1204 for dir in env::split_paths(&target_path) {
1205 let p = dir.join(&path);
1207 return load_file(&p);
1210 Err(format!("Could not find specification for target {:?}", target_triple))
1212 TargetTriple::TargetPath(ref target_path) => {
1213 if target_path.is_file() {
1214 return load_file(&target_path);
1216 Err(format!("Target path {:?} is not a valid file", target_path))
1222 impl ToJson for Target {
1223 fn to_json(&self) -> Json {
1224 let mut d = BTreeMap::new();
1225 let default: TargetOptions = Default::default();
1227 macro_rules! target_val {
1228 ($attr:ident) => ( {
1229 let name = (stringify!($attr)).replace("_", "-");
1230 d.insert(name, self.$attr.to_json());
1232 ($attr:ident, $key_name:expr) => ( {
1233 let name = $key_name;
1234 d.insert(name.to_string(), self.$attr.to_json());
1238 macro_rules! target_option_val {
1239 ($attr:ident) => ( {
1240 let name = (stringify!($attr)).replace("_", "-");
1241 if default.$attr != self.options.$attr {
1242 d.insert(name, self.options.$attr.to_json());
1245 ($attr:ident, $key_name:expr) => ( {
1246 let name = $key_name;
1247 if default.$attr != self.options.$attr {
1248 d.insert(name.to_string(), self.options.$attr.to_json());
1251 (link_args - $attr:ident) => ( {
1252 let name = (stringify!($attr)).replace("_", "-");
1253 if default.$attr != self.options.$attr {
1254 let obj = self.options.$attr
1256 .map(|(k, v)| (k.desc().to_owned(), v.clone()))
1257 .collect::<BTreeMap<_, _>>();
1258 d.insert(name, obj.to_json());
1261 (env - $attr:ident) => ( {
1262 let name = (stringify!($attr)).replace("_", "-");
1263 if default.$attr != self.options.$attr {
1264 let obj = self.options.$attr
1266 .map(|&(ref k, ref v)| k.clone() + "=" + &v)
1267 .collect::<Vec<_>>();
1268 d.insert(name, obj.to_json());
1274 target_val!(llvm_target);
1275 target_val!(target_endian);
1276 target_val!(target_pointer_width);
1277 target_val!(target_c_int_width);
1279 target_val!(target_os, "os");
1280 target_val!(target_env, "env");
1281 target_val!(target_vendor, "vendor");
1282 target_val!(data_layout);
1283 target_val!(linker_flavor);
1285 target_option_val!(is_builtin);
1286 target_option_val!(linker);
1287 target_option_val!(lld_flavor);
1288 target_option_val!(link_args - pre_link_args);
1289 target_option_val!(link_args - pre_link_args_crt);
1290 target_option_val!(pre_link_objects_exe);
1291 target_option_val!(pre_link_objects_exe_crt);
1292 target_option_val!(pre_link_objects_dll);
1293 target_option_val!(link_args - late_link_args);
1294 target_option_val!(post_link_objects);
1295 target_option_val!(post_link_objects_crt);
1296 target_option_val!(link_args - post_link_args);
1297 target_option_val!(env - link_env);
1298 target_option_val!(asm_args);
1299 target_option_val!(cpu);
1300 target_option_val!(features);
1301 target_option_val!(dynamic_linking);
1302 target_option_val!(only_cdylib);
1303 target_option_val!(executables);
1304 target_option_val!(relocation_model);
1305 target_option_val!(code_model);
1306 target_option_val!(tls_model);
1307 target_option_val!(disable_redzone);
1308 target_option_val!(eliminate_frame_pointer);
1309 target_option_val!(function_sections);
1310 target_option_val!(dll_prefix);
1311 target_option_val!(dll_suffix);
1312 target_option_val!(exe_suffix);
1313 target_option_val!(staticlib_prefix);
1314 target_option_val!(staticlib_suffix);
1315 target_option_val!(target_family);
1316 target_option_val!(abi_return_struct_as_int);
1317 target_option_val!(is_like_osx);
1318 target_option_val!(is_like_solaris);
1319 target_option_val!(is_like_windows);
1320 target_option_val!(is_like_msvc);
1321 target_option_val!(is_like_emscripten);
1322 target_option_val!(is_like_android);
1323 target_option_val!(is_like_fuchsia);
1324 target_option_val!(linker_is_gnu);
1325 target_option_val!(allows_weak_linkage);
1326 target_option_val!(has_rpath);
1327 target_option_val!(no_default_libraries);
1328 target_option_val!(position_independent_executables);
1329 target_option_val!(needs_plt);
1330 target_option_val!(relro_level);
1331 target_option_val!(archive_format);
1332 target_option_val!(allow_asm);
1333 target_option_val!(custom_unwind_resume);
1334 target_option_val!(has_elf_tls);
1335 target_option_val!(obj_is_bitcode);
1336 target_option_val!(no_integrated_as);
1337 target_option_val!(min_atomic_width);
1338 target_option_val!(max_atomic_width);
1339 target_option_val!(atomic_cas);
1340 target_option_val!(panic_strategy);
1341 target_option_val!(crt_static_allows_dylibs);
1342 target_option_val!(crt_static_default);
1343 target_option_val!(crt_static_respected);
1344 target_option_val!(stack_probes);
1345 target_option_val!(min_global_align);
1346 target_option_val!(default_codegen_units);
1347 target_option_val!(trap_unreachable);
1348 target_option_val!(requires_lto);
1349 target_option_val!(singlethread);
1350 target_option_val!(no_builtins);
1351 target_option_val!(codegen_backend);
1352 target_option_val!(default_hidden_visibility);
1353 target_option_val!(embed_bitcode);
1354 target_option_val!(emit_debug_gdb_scripts);
1355 target_option_val!(requires_uwtable);
1356 target_option_val!(simd_types_indirect);
1357 target_option_val!(override_export_symbols);
1358 target_option_val!(merge_functions);
1360 if default.abi_blacklist != self.options.abi_blacklist {
1361 d.insert("abi-blacklist".to_string(), self.options.abi_blacklist.iter()
1362 .map(|&name| Abi::name(name).to_json())
1363 .collect::<Vec<_>>().to_json());
1370 /// Either a target triple string or a path to a JSON file.
1371 #[derive(PartialEq, Clone, Debug, Hash, RustcEncodable, RustcDecodable)]
1372 pub enum TargetTriple {
1373 TargetTriple(String),
1374 TargetPath(PathBuf),
1378 /// Creates a target triple from the passed target triple string.
1379 pub fn from_triple(triple: &str) -> Self {
1380 TargetTriple::TargetTriple(triple.to_string())
1383 /// Creates a target triple from the passed target path.
1384 pub fn from_path(path: &Path) -> Result<Self, io::Error> {
1385 let canonicalized_path = path.canonicalize()?;
1386 Ok(TargetTriple::TargetPath(canonicalized_path))
1389 /// Returns a string triple for this target.
1391 /// If this target is a path, the file name (without extension) is returned.
1392 pub fn triple(&self) -> &str {
1394 TargetTriple::TargetTriple(ref triple) => triple,
1395 TargetTriple::TargetPath(ref path) => {
1396 path.file_stem().expect("target path must not be empty").to_str()
1397 .expect("target path must be valid unicode")
1402 /// Returns an extended string triple for this target.
1404 /// If this target is a path, a hash of the path is appended to the triple returned
1406 pub fn debug_triple(&self) -> String {
1407 use std::hash::{Hash, Hasher};
1408 use std::collections::hash_map::DefaultHasher;
1410 let triple = self.triple();
1411 if let TargetTriple::TargetPath(ref path) = *self {
1412 let mut hasher = DefaultHasher::new();
1413 path.hash(&mut hasher);
1414 let hash = hasher.finish();
1415 format!("{}-{}", triple, hash)
1422 impl fmt::Display for TargetTriple {
1423 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
1424 write!(f, "{}", self.debug_triple())