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 crate::spec::abi::{lookup as lookup_abi, Abi};
38 use rustc_serialize::json::{Json, ToJson};
39 use std::collections::BTreeMap;
40 use std::default::Default;
41 use std::path::{Path, PathBuf};
42 use std::str::FromStr;
45 use rustc_macros::HashStable_Generic;
58 mod hermit_kernel_base;
61 mod linux_kernel_base;
73 mod windows_msvc_base;
75 mod windows_uwp_msvc_base;
77 #[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
78 pub enum LinkerFlavor {
87 #[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
96 fn from_str(s: &str) -> Option<Self> {
98 "darwin" => LldFlavor::Ld64,
99 "gnu" => LldFlavor::Ld,
100 "link" => LldFlavor::Link,
101 "wasm" => LldFlavor::Wasm,
107 impl ToJson for LldFlavor {
108 fn to_json(&self) -> Json {
110 LldFlavor::Ld64 => "darwin",
111 LldFlavor::Ld => "gnu",
112 LldFlavor::Link => "link",
113 LldFlavor::Wasm => "wasm",
119 impl ToJson for LinkerFlavor {
120 fn to_json(&self) -> Json {
121 self.desc().to_json()
124 macro_rules! flavor_mappings {
125 ($((($($flavor:tt)*), $string:expr),)*) => (
127 pub const fn one_of() -> &'static str {
128 concat!("one of: ", $($string, " ",)*)
131 pub fn from_str(s: &str) -> Option<Self> {
133 $($string => $($flavor)*,)*
138 pub fn desc(&self) -> &str {
140 $($($flavor)* => $string,)*
148 ((LinkerFlavor::Em), "em"),
149 ((LinkerFlavor::Gcc), "gcc"),
150 ((LinkerFlavor::Ld), "ld"),
151 ((LinkerFlavor::Msvc), "msvc"),
152 ((LinkerFlavor::PtxLinker), "ptx-linker"),
153 ((LinkerFlavor::Lld(LldFlavor::Wasm)), "wasm-ld"),
154 ((LinkerFlavor::Lld(LldFlavor::Ld64)), "ld64.lld"),
155 ((LinkerFlavor::Lld(LldFlavor::Ld)), "ld.lld"),
156 ((LinkerFlavor::Lld(LldFlavor::Link)), "lld-link"),
159 #[derive(Clone, Copy, Debug, PartialEq, Hash, RustcEncodable, RustcDecodable, HashStable_Generic)]
160 pub enum PanicStrategy {
166 pub fn desc(&self) -> &str {
168 PanicStrategy::Unwind => "unwind",
169 PanicStrategy::Abort => "abort",
174 impl ToJson for PanicStrategy {
175 fn to_json(&self) -> Json {
177 PanicStrategy::Abort => "abort".to_json(),
178 PanicStrategy::Unwind => "unwind".to_json(),
183 #[derive(Clone, Copy, Debug, PartialEq, Hash, RustcEncodable, RustcDecodable)]
184 pub enum RelroLevel {
192 pub fn desc(&self) -> &str {
194 RelroLevel::Full => "full",
195 RelroLevel::Partial => "partial",
196 RelroLevel::Off => "off",
197 RelroLevel::None => "none",
202 impl FromStr for RelroLevel {
205 fn from_str(s: &str) -> Result<RelroLevel, ()> {
207 "full" => Ok(RelroLevel::Full),
208 "partial" => Ok(RelroLevel::Partial),
209 "off" => Ok(RelroLevel::Off),
210 "none" => Ok(RelroLevel::None),
216 impl ToJson for RelroLevel {
217 fn to_json(&self) -> Json {
219 RelroLevel::Full => "full".to_json(),
220 RelroLevel::Partial => "partial".to_json(),
221 RelroLevel::Off => "off".to_json(),
222 RelroLevel::None => "None".to_json(),
227 #[derive(Clone, Copy, Debug, PartialEq, Hash, RustcEncodable, RustcDecodable)]
228 pub enum MergeFunctions {
234 impl MergeFunctions {
235 pub fn desc(&self) -> &str {
237 MergeFunctions::Disabled => "disabled",
238 MergeFunctions::Trampolines => "trampolines",
239 MergeFunctions::Aliases => "aliases",
244 impl FromStr for MergeFunctions {
247 fn from_str(s: &str) -> Result<MergeFunctions, ()> {
249 "disabled" => Ok(MergeFunctions::Disabled),
250 "trampolines" => Ok(MergeFunctions::Trampolines),
251 "aliases" => Ok(MergeFunctions::Aliases),
257 impl ToJson for MergeFunctions {
258 fn to_json(&self) -> Json {
260 MergeFunctions::Disabled => "disabled".to_json(),
261 MergeFunctions::Trampolines => "trampolines".to_json(),
262 MergeFunctions::Aliases => "aliases".to_json(),
267 pub enum LoadTargetError {
268 BuiltinTargetNotFound(String),
272 pub type LinkArgs = BTreeMap<LinkerFlavor, Vec<String>>;
273 pub type TargetResult = Result<Target, String>;
275 macro_rules! supported_targets {
276 ( $(($( $triple:literal, )+ $module:ident ),)+ ) => {
279 /// List of supported targets
280 const TARGETS: &[&str] = &[$($($triple),+),+];
282 fn load_specific(target: &str) -> Result<Target, LoadTargetError> {
286 let mut t = $module::target()
287 .map_err(LoadTargetError::Other)?;
288 t.options.is_builtin = true;
290 // round-trip through the JSON parser to ensure at
291 // run-time that the parser works correctly
292 t = Target::from_json(t.to_json())
293 .map_err(LoadTargetError::Other)?;
294 debug!("got builtin target: {:?}", t);
298 _ => Err(LoadTargetError::BuiltinTargetNotFound(
299 format!("Unable to find target: {}", target)))
303 pub fn get_targets() -> impl Iterator<Item = String> {
304 TARGETS.iter().filter_map(|t| -> Option<String> {
306 .and(Ok(t.to_string()))
312 mod test_json_encode_decode {
313 use rustc_serialize::json::ToJson;
315 $(use super::$module;)+
318 #[test] // `#[test]` - this is hard to put into a separate file, make an exception
320 // Grab the TargetResult struct. If we successfully retrieved
321 // a Target, then the test JSON encoding/decoding can run for this
322 // Target on this testing platform (i.e., checking the iOS targets
323 // only on a Mac test platform).
324 let _ = $module::target().map(|original| {
325 let as_json = original.to_json();
326 let parsed = Target::from_json(as_json).unwrap();
327 assert_eq!(original, parsed);
336 ("x86_64-unknown-linux-gnu", x86_64_unknown_linux_gnu),
337 ("x86_64-unknown-linux-gnux32", x86_64_unknown_linux_gnux32),
338 ("i686-unknown-linux-gnu", i686_unknown_linux_gnu),
339 ("i586-unknown-linux-gnu", i586_unknown_linux_gnu),
340 ("mips-unknown-linux-gnu", mips_unknown_linux_gnu),
341 ("mips64-unknown-linux-gnuabi64", mips64_unknown_linux_gnuabi64),
342 ("mips64el-unknown-linux-gnuabi64", mips64el_unknown_linux_gnuabi64),
343 ("mipsisa32r6-unknown-linux-gnu", mipsisa32r6_unknown_linux_gnu),
344 ("mipsisa32r6el-unknown-linux-gnu", mipsisa32r6el_unknown_linux_gnu),
345 ("mipsisa64r6-unknown-linux-gnuabi64", mipsisa64r6_unknown_linux_gnuabi64),
346 ("mipsisa64r6el-unknown-linux-gnuabi64", mipsisa64r6el_unknown_linux_gnuabi64),
347 ("mipsel-unknown-linux-gnu", mipsel_unknown_linux_gnu),
348 ("powerpc-unknown-linux-gnu", powerpc_unknown_linux_gnu),
349 ("powerpc-unknown-linux-gnuspe", powerpc_unknown_linux_gnuspe),
350 ("powerpc-unknown-linux-musl", powerpc_unknown_linux_musl),
351 ("powerpc64-unknown-linux-gnu", powerpc64_unknown_linux_gnu),
352 ("powerpc64-unknown-linux-musl", powerpc64_unknown_linux_musl),
353 ("powerpc64le-unknown-linux-gnu", powerpc64le_unknown_linux_gnu),
354 ("powerpc64le-unknown-linux-musl", powerpc64le_unknown_linux_musl),
355 ("s390x-unknown-linux-gnu", s390x_unknown_linux_gnu),
356 ("sparc-unknown-linux-gnu", sparc_unknown_linux_gnu),
357 ("sparc64-unknown-linux-gnu", sparc64_unknown_linux_gnu),
358 ("arm-unknown-linux-gnueabi", arm_unknown_linux_gnueabi),
359 ("arm-unknown-linux-gnueabihf", arm_unknown_linux_gnueabihf),
360 ("arm-unknown-linux-musleabi", arm_unknown_linux_musleabi),
361 ("arm-unknown-linux-musleabihf", arm_unknown_linux_musleabihf),
362 ("armv4t-unknown-linux-gnueabi", armv4t_unknown_linux_gnueabi),
363 ("armv5te-unknown-linux-gnueabi", armv5te_unknown_linux_gnueabi),
364 ("armv5te-unknown-linux-musleabi", armv5te_unknown_linux_musleabi),
365 ("armv7-unknown-linux-gnueabi", armv7_unknown_linux_gnueabi),
366 ("armv7-unknown-linux-gnueabihf", armv7_unknown_linux_gnueabihf),
367 ("thumbv7neon-unknown-linux-gnueabihf", thumbv7neon_unknown_linux_gnueabihf),
368 ("thumbv7neon-unknown-linux-musleabihf", thumbv7neon_unknown_linux_musleabihf),
369 ("armv7-unknown-linux-musleabi", armv7_unknown_linux_musleabi),
370 ("armv7-unknown-linux-musleabihf", armv7_unknown_linux_musleabihf),
371 ("aarch64-unknown-linux-gnu", aarch64_unknown_linux_gnu),
372 ("aarch64-unknown-linux-musl", aarch64_unknown_linux_musl),
373 ("x86_64-unknown-linux-musl", x86_64_unknown_linux_musl),
374 ("i686-unknown-linux-musl", i686_unknown_linux_musl),
375 ("i586-unknown-linux-musl", i586_unknown_linux_musl),
376 ("mips-unknown-linux-musl", mips_unknown_linux_musl),
377 ("mipsel-unknown-linux-musl", mipsel_unknown_linux_musl),
378 ("mips64-unknown-linux-muslabi64", mips64_unknown_linux_muslabi64),
379 ("mips64el-unknown-linux-muslabi64", mips64el_unknown_linux_muslabi64),
380 ("hexagon-unknown-linux-musl", hexagon_unknown_linux_musl),
382 ("mips-unknown-linux-uclibc", mips_unknown_linux_uclibc),
383 ("mipsel-unknown-linux-uclibc", mipsel_unknown_linux_uclibc),
385 ("i686-linux-android", i686_linux_android),
386 ("x86_64-linux-android", x86_64_linux_android),
387 ("arm-linux-androideabi", arm_linux_androideabi),
388 ("armv7-linux-androideabi", armv7_linux_androideabi),
389 ("thumbv7neon-linux-androideabi", thumbv7neon_linux_androideabi),
390 ("aarch64-linux-android", aarch64_linux_android),
392 ("x86_64-linux-kernel", x86_64_linux_kernel),
394 ("aarch64-unknown-freebsd", aarch64_unknown_freebsd),
395 ("armv6-unknown-freebsd", armv6_unknown_freebsd),
396 ("armv7-unknown-freebsd", armv7_unknown_freebsd),
397 ("i686-unknown-freebsd", i686_unknown_freebsd),
398 ("powerpc64-unknown-freebsd", powerpc64_unknown_freebsd),
399 ("x86_64-unknown-freebsd", x86_64_unknown_freebsd),
401 ("x86_64-unknown-dragonfly", x86_64_unknown_dragonfly),
403 ("aarch64-unknown-openbsd", aarch64_unknown_openbsd),
404 ("i686-unknown-openbsd", i686_unknown_openbsd),
405 ("sparc64-unknown-openbsd", sparc64_unknown_openbsd),
406 ("x86_64-unknown-openbsd", x86_64_unknown_openbsd),
408 ("aarch64-unknown-netbsd", aarch64_unknown_netbsd),
409 ("armv6-unknown-netbsd-eabihf", armv6_unknown_netbsd_eabihf),
410 ("armv7-unknown-netbsd-eabihf", armv7_unknown_netbsd_eabihf),
411 ("i686-unknown-netbsd", i686_unknown_netbsd),
412 ("powerpc-unknown-netbsd", powerpc_unknown_netbsd),
413 ("sparc64-unknown-netbsd", sparc64_unknown_netbsd),
414 ("x86_64-unknown-netbsd", x86_64_unknown_netbsd),
415 ("x86_64-rumprun-netbsd", x86_64_rumprun_netbsd),
417 ("i686-unknown-haiku", i686_unknown_haiku),
418 ("x86_64-unknown-haiku", x86_64_unknown_haiku),
420 ("x86_64-apple-darwin", x86_64_apple_darwin),
421 ("i686-apple-darwin", i686_apple_darwin),
423 ("aarch64-fuchsia", aarch64_fuchsia),
424 ("x86_64-fuchsia", x86_64_fuchsia),
426 ("x86_64-unknown-l4re-uclibc", x86_64_unknown_l4re_uclibc),
428 ("aarch64-unknown-redox", aarch64_unknown_redox),
429 ("x86_64-unknown-redox", x86_64_unknown_redox),
431 ("i386-apple-ios", i386_apple_ios),
432 ("x86_64-apple-ios", x86_64_apple_ios),
433 ("aarch64-apple-ios", aarch64_apple_ios),
434 ("armv7-apple-ios", armv7_apple_ios),
435 ("armv7s-apple-ios", armv7s_apple_ios),
436 ("x86_64-apple-ios-macabi", x86_64_apple_ios_macabi),
437 ("aarch64-apple-tvos", aarch64_apple_tvos),
438 ("x86_64-apple-tvos", x86_64_apple_tvos),
440 ("armebv7r-none-eabi", armebv7r_none_eabi),
441 ("armebv7r-none-eabihf", armebv7r_none_eabihf),
442 ("armv7r-none-eabi", armv7r_none_eabi),
443 ("armv7r-none-eabihf", armv7r_none_eabihf),
445 // `x86_64-pc-solaris` is an alias for `x86_64_sun_solaris` for backwards compatibility reasons.
446 // (See <https://github.com/rust-lang/rust/issues/40531>.)
447 ("x86_64-sun-solaris", "x86_64-pc-solaris", x86_64_sun_solaris),
448 ("sparcv9-sun-solaris", sparcv9_sun_solaris),
450 ("x86_64-pc-windows-gnu", x86_64_pc_windows_gnu),
451 ("i686-pc-windows-gnu", i686_pc_windows_gnu),
452 ("i686-uwp-windows-gnu", i686_uwp_windows_gnu),
453 ("x86_64-uwp-windows-gnu", x86_64_uwp_windows_gnu),
455 ("aarch64-pc-windows-msvc", aarch64_pc_windows_msvc),
456 ("aarch64-uwp-windows-msvc", aarch64_uwp_windows_msvc),
457 ("x86_64-pc-windows-msvc", x86_64_pc_windows_msvc),
458 ("x86_64-uwp-windows-msvc", x86_64_uwp_windows_msvc),
459 ("i686-pc-windows-msvc", i686_pc_windows_msvc),
460 ("i686-uwp-windows-msvc", i686_uwp_windows_msvc),
461 ("i586-pc-windows-msvc", i586_pc_windows_msvc),
462 ("thumbv7a-pc-windows-msvc", thumbv7a_pc_windows_msvc),
464 ("asmjs-unknown-emscripten", asmjs_unknown_emscripten),
465 ("wasm32-unknown-emscripten", wasm32_unknown_emscripten),
466 ("wasm32-unknown-unknown", wasm32_unknown_unknown),
467 ("wasm32-wasi", wasm32_wasi),
469 ("thumbv6m-none-eabi", thumbv6m_none_eabi),
470 ("thumbv7m-none-eabi", thumbv7m_none_eabi),
471 ("thumbv7em-none-eabi", thumbv7em_none_eabi),
472 ("thumbv7em-none-eabihf", thumbv7em_none_eabihf),
473 ("thumbv8m.base-none-eabi", thumbv8m_base_none_eabi),
474 ("thumbv8m.main-none-eabi", thumbv8m_main_none_eabi),
475 ("thumbv8m.main-none-eabihf", thumbv8m_main_none_eabihf),
477 ("armv7a-none-eabi", armv7a_none_eabi),
478 ("armv7a-none-eabihf", armv7a_none_eabihf),
480 ("msp430-none-elf", msp430_none_elf),
482 ("aarch64-unknown-cloudabi", aarch64_unknown_cloudabi),
483 ("armv7-unknown-cloudabi-eabihf", armv7_unknown_cloudabi_eabihf),
484 ("i686-unknown-cloudabi", i686_unknown_cloudabi),
485 ("x86_64-unknown-cloudabi", x86_64_unknown_cloudabi),
487 ("aarch64-unknown-hermit", aarch64_unknown_hermit),
488 ("x86_64-unknown-hermit", x86_64_unknown_hermit),
489 ("x86_64-unknown-hermit-kernel", x86_64_unknown_hermit_kernel),
491 ("riscv32i-unknown-none-elf", riscv32i_unknown_none_elf),
492 ("riscv32imc-unknown-none-elf", riscv32imc_unknown_none_elf),
493 ("riscv32imac-unknown-none-elf", riscv32imac_unknown_none_elf),
494 ("riscv64imac-unknown-none-elf", riscv64imac_unknown_none_elf),
495 ("riscv64gc-unknown-none-elf", riscv64gc_unknown_none_elf),
496 ("riscv64gc-unknown-linux-gnu", riscv64gc_unknown_linux_gnu),
498 ("aarch64-unknown-none", aarch64_unknown_none),
499 ("aarch64-unknown-none-softfloat", aarch64_unknown_none_softfloat),
501 ("x86_64-fortanix-unknown-sgx", x86_64_fortanix_unknown_sgx),
503 ("x86_64-unknown-uefi", x86_64_unknown_uefi),
504 ("i686-unknown-uefi", i686_unknown_uefi),
506 ("nvptx64-nvidia-cuda", nvptx64_nvidia_cuda),
508 ("i686-wrs-vxworks", i686_wrs_vxworks),
509 ("x86_64-wrs-vxworks", x86_64_wrs_vxworks),
510 ("armv7-wrs-vxworks-eabihf", armv7_wrs_vxworks_eabihf),
511 ("aarch64-wrs-vxworks", aarch64_wrs_vxworks),
512 ("powerpc-wrs-vxworks", powerpc_wrs_vxworks),
513 ("powerpc-wrs-vxworks-spe", powerpc_wrs_vxworks_spe),
514 ("powerpc64-wrs-vxworks", powerpc64_wrs_vxworks),
517 /// Everything `rustc` knows about how to compile for a specific target.
519 /// Every field here must be specified, and has no default value.
520 #[derive(PartialEq, Clone, Debug)]
522 /// Target triple to pass to LLVM.
523 pub llvm_target: String,
524 /// String to use as the `target_endian` `cfg` variable.
525 pub target_endian: String,
526 /// String to use as the `target_pointer_width` `cfg` variable.
527 pub target_pointer_width: String,
528 /// Width of c_int type
529 pub target_c_int_width: String,
530 /// OS name to use for conditional compilation.
531 pub target_os: String,
532 /// Environment name to use for conditional compilation.
533 pub target_env: String,
534 /// Vendor name to use for conditional compilation.
535 pub target_vendor: String,
536 /// Architecture to use for ABI considerations. Valid options include: "x86",
537 /// "x86_64", "arm", "aarch64", "mips", "powerpc", "powerpc64", and others.
539 /// [Data layout](http://llvm.org/docs/LangRef.html#data-layout) to pass to LLVM.
540 pub data_layout: String,
542 pub linker_flavor: LinkerFlavor,
543 /// Optional settings with defaults.
544 pub options: TargetOptions,
547 pub trait HasTargetSpec {
548 fn target_spec(&self) -> &Target;
551 impl HasTargetSpec for Target {
552 fn target_spec(&self) -> &Target {
557 /// Optional aspects of a target specification.
559 /// This has an implementation of `Default`, see each field for what the default is. In general,
560 /// these try to take "minimal defaults" that don't assume anything about the runtime they run in.
561 #[derive(PartialEq, Clone, Debug)]
562 pub struct TargetOptions {
563 /// Whether the target is built-in or loaded from a custom target specification.
564 pub is_builtin: bool,
567 pub linker: Option<String>,
570 pub lld_flavor: LldFlavor,
572 /// Linker arguments that are passed *before* any user-defined libraries.
573 pub pre_link_args: LinkArgs, // ... unconditionally
574 pub pre_link_args_crt: LinkArgs, // ... when linking with a bundled crt
575 /// Objects to link before all others, always found within the
577 pub pre_link_objects_exe: Vec<String>, // ... when linking an executable, unconditionally
578 pub pre_link_objects_exe_crt: Vec<String>, // ... when linking an executable with a bundled crt
579 pub pre_link_objects_dll: Vec<String>, // ... when linking a dylib
580 /// Linker arguments that are unconditionally passed after any
581 /// user-defined but before post_link_objects. Standard platform
582 /// libraries that should be always be linked to, usually go here.
583 pub late_link_args: LinkArgs,
584 /// Linker arguments used in addition to `late_link_args` if at least one
585 /// Rust dependency is dynamically linked.
586 pub late_link_args_dynamic: LinkArgs,
587 /// Linker arguments used in addition to `late_link_args` if aall Rust
588 /// dependencies are statically linked.
589 pub late_link_args_static: LinkArgs,
590 /// Objects to link after all others, always found within the
592 pub post_link_objects: Vec<String>, // ... unconditionally
593 pub post_link_objects_crt: Vec<String>, // ... when linking with a bundled crt
594 /// Linker arguments that are unconditionally passed *after* any
595 /// user-defined libraries.
596 pub post_link_args: LinkArgs,
598 /// Environment variables to be set for the linker invocation.
599 pub link_env: Vec<(String, String)>,
600 /// Environment variables to be removed for the linker invocation.
601 pub link_env_remove: Vec<String>,
603 /// Extra arguments to pass to the external assembler (when used)
604 pub asm_args: Vec<String>,
606 /// Default CPU to pass to LLVM. Corresponds to `llc -mcpu=$cpu`. Defaults
609 /// Default target features to pass to LLVM. These features will *always* be
610 /// passed, and cannot be disabled even via `-C`. Corresponds to `llc
611 /// -mattr=$features`.
612 pub features: String,
613 /// Whether dynamic linking is available on this target. Defaults to false.
614 pub dynamic_linking: bool,
615 /// If dynamic linking is available, whether only cdylibs are supported.
616 pub only_cdylib: bool,
617 /// Whether executables are available on this target. iOS, for example, only allows static
618 /// libraries. Defaults to false.
619 pub executables: bool,
620 /// Relocation model to use in object file. Corresponds to `llc
621 /// -relocation-model=$relocation_model`. Defaults to "pic".
622 pub relocation_model: String,
623 /// Code model to use. Corresponds to `llc -code-model=$code_model`.
624 pub code_model: Option<String>,
625 /// TLS model to use. Options are "global-dynamic" (default), "local-dynamic", "initial-exec"
626 /// and "local-exec". This is similar to the -ftls-model option in GCC/Clang.
627 pub tls_model: String,
628 /// Do not emit code that uses the "red zone", if the ABI has one. Defaults to false.
629 pub disable_redzone: bool,
630 /// Eliminate frame pointers from stack frames if possible. Defaults to true.
631 pub eliminate_frame_pointer: bool,
632 /// Emit each function in its own section. Defaults to true.
633 pub function_sections: bool,
634 /// String to prepend to the name of every dynamic library. Defaults to "lib".
635 pub dll_prefix: String,
636 /// String to append to the name of every dynamic library. Defaults to ".so".
637 pub dll_suffix: String,
638 /// String to append to the name of every executable.
639 pub exe_suffix: String,
640 /// String to prepend to the name of every static library. Defaults to "lib".
641 pub staticlib_prefix: String,
642 /// String to append to the name of every static library. Defaults to ".a".
643 pub staticlib_suffix: String,
644 /// OS family to use for conditional compilation. Valid options: "unix", "windows".
645 pub target_family: Option<String>,
646 /// Whether the target toolchain's ABI supports returning small structs as an integer.
647 pub abi_return_struct_as_int: bool,
648 /// Whether the target toolchain is like macOS's. Only useful for compiling against iOS/macOS,
649 /// in particular running dsymutil and some other stuff like `-dead_strip`. Defaults to false.
650 pub is_like_osx: bool,
651 /// Whether the target toolchain is like Solaris's.
652 /// Only useful for compiling against Illumos/Solaris,
653 /// as they have a different set of linker flags. Defaults to false.
654 pub is_like_solaris: bool,
655 /// Whether the target toolchain is like Windows'. Only useful for compiling against Windows,
656 /// only really used for figuring out how to find libraries, since Windows uses its own
657 /// library naming convention. Defaults to false.
658 pub is_like_windows: bool,
659 pub is_like_msvc: bool,
660 /// Whether the target toolchain is like Android's. Only useful for compiling against Android.
661 /// Defaults to false.
662 pub is_like_android: bool,
663 /// Whether the target toolchain is like Emscripten's. Only useful for compiling with
664 /// Emscripten toolchain.
665 /// Defaults to false.
666 pub is_like_emscripten: bool,
667 /// Whether the target toolchain is like Fuchsia's.
668 pub is_like_fuchsia: bool,
669 /// Whether the linker support GNU-like arguments such as -O. Defaults to false.
670 pub linker_is_gnu: bool,
671 /// The MinGW toolchain has a known issue that prevents it from correctly
672 /// handling COFF object files with more than 2<sup>15</sup> sections. Since each weak
673 /// symbol needs its own COMDAT section, weak linkage implies a large
674 /// number sections that easily exceeds the given limit for larger
675 /// codebases. Consequently we want a way to disallow weak linkage on some
677 pub allows_weak_linkage: bool,
678 /// Whether the linker support rpaths or not. Defaults to false.
680 /// Whether to disable linking to the default libraries, typically corresponds
681 /// to `-nodefaultlibs`. Defaults to true.
682 pub no_default_libraries: bool,
683 /// Dynamically linked executables can be compiled as position independent
684 /// if the default relocation model of position independent code is not
685 /// changed. This is a requirement to take advantage of ASLR, as otherwise
686 /// the functions in the executable are not randomized and can be used
687 /// during an exploit of a vulnerability in any code.
688 pub position_independent_executables: bool,
689 /// Determines if the target always requires using the PLT for indirect
690 /// library calls or not. This controls the default value of the `-Z plt` flag.
692 /// Either partial, full, or off. Full RELRO makes the dynamic linker
693 /// resolve all symbols at startup and marks the GOT read-only before
694 /// starting the program, preventing overwriting the GOT.
695 pub relro_level: RelroLevel,
696 /// Format that archives should be emitted in. This affects whether we use
697 /// LLVM to assemble an archive or fall back to the system linker, and
698 /// currently only "gnu" is used to fall into LLVM. Unknown strings cause
699 /// the system linker to be used.
700 pub archive_format: String,
701 /// Is asm!() allowed? Defaults to true.
703 /// Whether the runtime startup code requires the `main` function be passed
704 /// `argc` and `argv` values.
705 pub main_needs_argc_argv: bool,
707 /// Flag indicating whether ELF TLS (e.g., #[thread_local]) is available for
709 pub has_elf_tls: bool,
710 // This is mainly for easy compatibility with emscripten.
711 // If we give emcc .o files that are actually .bc files it
713 pub obj_is_bitcode: bool,
715 /// Don't use this field; instead use the `.min_atomic_width()` method.
716 pub min_atomic_width: Option<u64>,
718 /// Don't use this field; instead use the `.max_atomic_width()` method.
719 pub max_atomic_width: Option<u64>,
721 /// Whether the target supports atomic CAS operations natively
722 pub atomic_cas: bool,
724 /// Panic strategy: "unwind" or "abort"
725 pub panic_strategy: PanicStrategy,
727 /// A blacklist of ABIs unsupported by the current target. Note that generic
728 /// ABIs are considered to be supported on all platforms and cannot be blacklisted.
729 pub abi_blacklist: Vec<Abi>,
731 /// Whether or not linking dylibs to a static CRT is allowed.
732 pub crt_static_allows_dylibs: bool,
733 /// Whether or not the CRT is statically linked by default.
734 pub crt_static_default: bool,
735 /// Whether or not crt-static is respected by the compiler (or is a no-op).
736 pub crt_static_respected: bool,
738 /// Whether or not stack probes (__rust_probestack) are enabled
739 pub stack_probes: bool,
741 /// The minimum alignment for global symbols.
742 pub min_global_align: Option<u64>,
744 /// Default number of codegen units to use in debug mode
745 pub default_codegen_units: Option<u64>,
747 /// Whether to generate trap instructions in places where optimization would
748 /// otherwise produce control flow that falls through into unrelated memory.
749 pub trap_unreachable: bool,
751 /// This target requires everything to be compiled with LTO to emit a final
752 /// executable, aka there is no native linker for this target.
753 pub requires_lto: bool,
755 /// This target has no support for threads.
756 pub singlethread: bool,
758 /// Whether library functions call lowering/optimization is disabled in LLVM
759 /// for this target unconditionally.
760 pub no_builtins: bool,
762 /// The codegen backend to use for this target, typically "llvm"
763 pub codegen_backend: String,
765 /// The default visibility for symbols in this target should be "hidden"
766 /// rather than "default"
767 pub default_hidden_visibility: bool,
769 /// Whether a .debug_gdb_scripts section will be added to the output object file
770 pub emit_debug_gdb_scripts: bool,
772 /// Whether or not to unconditionally `uwtable` attributes on functions,
773 /// typically because the platform needs to unwind for things like stack
775 pub requires_uwtable: bool,
777 /// Whether or not SIMD types are passed by reference in the Rust ABI,
778 /// typically required if a target can be compiled with a mixed set of
779 /// target features. This is `true` by default, and `false` for targets like
780 /// wasm32 where the whole program either has simd or not.
781 pub simd_types_indirect: bool,
783 /// Pass a list of symbol which should be exported in the dylib to the linker.
784 pub limit_rdylib_exports: bool,
786 /// If set, have the linker export exactly these symbols, instead of using
787 /// the usual logic to figure this out from the crate itself.
788 pub override_export_symbols: Option<Vec<String>>,
790 /// Determines how or whether the MergeFunctions LLVM pass should run for
791 /// this target. Either "disabled", "trampolines", or "aliases".
792 /// The MergeFunctions pass is generally useful, but some targets may need
793 /// to opt out. The default is "aliases".
795 /// Workaround for: https://github.com/rust-lang/rust/issues/57356
796 pub merge_functions: MergeFunctions,
798 /// Use platform dependent mcount function
799 pub target_mcount: String,
801 /// LLVM ABI name, corresponds to the '-mabi' parameter available in multilib C compilers
802 pub llvm_abiname: String,
804 /// Whether or not RelaxElfRelocation flag will be passed to the linker
805 pub relax_elf_relocations: bool,
807 /// Additional arguments to pass to LLVM, similar to the `-C llvm-args` codegen option.
808 pub llvm_args: Vec<String>,
811 impl Default for TargetOptions {
812 /// Creates a set of "sane defaults" for any target. This is still
813 /// incomplete, and if used for compilation, will certainly not work.
814 fn default() -> TargetOptions {
817 linker: option_env!("CFG_DEFAULT_LINKER").map(|s| s.to_string()),
818 lld_flavor: LldFlavor::Ld,
819 pre_link_args: LinkArgs::new(),
820 pre_link_args_crt: LinkArgs::new(),
821 post_link_args: LinkArgs::new(),
822 asm_args: Vec::new(),
823 cpu: "generic".to_string(),
824 features: String::new(),
825 dynamic_linking: false,
828 relocation_model: "pic".to_string(),
830 tls_model: "global-dynamic".to_string(),
831 disable_redzone: false,
832 eliminate_frame_pointer: true,
833 function_sections: true,
834 dll_prefix: "lib".to_string(),
835 dll_suffix: ".so".to_string(),
836 exe_suffix: String::new(),
837 staticlib_prefix: "lib".to_string(),
838 staticlib_suffix: ".a".to_string(),
840 abi_return_struct_as_int: false,
842 is_like_solaris: false,
843 is_like_windows: false,
844 is_like_android: false,
845 is_like_emscripten: false,
847 is_like_fuchsia: false,
848 linker_is_gnu: false,
849 allows_weak_linkage: true,
851 no_default_libraries: true,
852 position_independent_executables: false,
854 relro_level: RelroLevel::None,
855 pre_link_objects_exe: Vec::new(),
856 pre_link_objects_exe_crt: Vec::new(),
857 pre_link_objects_dll: Vec::new(),
858 post_link_objects: Vec::new(),
859 post_link_objects_crt: Vec::new(),
860 late_link_args: LinkArgs::new(),
861 late_link_args_dynamic: LinkArgs::new(),
862 late_link_args_static: LinkArgs::new(),
863 link_env: Vec::new(),
864 link_env_remove: Vec::new(),
865 archive_format: "gnu".to_string(),
866 main_needs_argc_argv: true,
869 obj_is_bitcode: false,
870 min_atomic_width: None,
871 max_atomic_width: None,
873 panic_strategy: PanicStrategy::Unwind,
874 abi_blacklist: vec![],
875 crt_static_allows_dylibs: false,
876 crt_static_default: false,
877 crt_static_respected: false,
879 min_global_align: None,
880 default_codegen_units: None,
881 trap_unreachable: true,
885 codegen_backend: "llvm".to_string(),
886 default_hidden_visibility: false,
887 emit_debug_gdb_scripts: true,
888 requires_uwtable: false,
889 simd_types_indirect: true,
890 limit_rdylib_exports: true,
891 override_export_symbols: None,
892 merge_functions: MergeFunctions::Aliases,
893 target_mcount: "mcount".to_string(),
894 llvm_abiname: "".to_string(),
895 relax_elf_relocations: false,
902 /// Given a function ABI, turn it into the correct ABI for this target.
903 pub fn adjust_abi(&self, abi: Abi) -> Abi {
906 if self.options.is_like_windows && self.arch == "x86" {
912 // These ABI kinds are ignored on non-x86 Windows targets.
913 // See https://docs.microsoft.com/en-us/cpp/cpp/argument-passing-and-naming-conventions
914 // and the individual pages for __stdcall et al.
915 Abi::Stdcall | Abi::Fastcall | Abi::Vectorcall | Abi::Thiscall => {
916 if self.options.is_like_windows && self.arch != "x86" { Abi::C } else { abi }
919 if self.arch == "x86_64" {
929 /// Minimum integer size in bits that this target can perform atomic
931 pub fn min_atomic_width(&self) -> u64 {
932 self.options.min_atomic_width.unwrap_or(8)
935 /// Maximum integer size in bits that this target can perform atomic
937 pub fn max_atomic_width(&self) -> u64 {
938 self.options.max_atomic_width.unwrap_or_else(|| self.target_pointer_width.parse().unwrap())
941 pub fn is_abi_supported(&self, abi: Abi) -> bool {
942 abi.generic() || !self.options.abi_blacklist.contains(&abi)
945 /// Loads a target descriptor from a JSON object.
946 pub fn from_json(obj: Json) -> TargetResult {
947 // While ugly, this code must remain this way to retain
948 // compatibility with existing JSON fields and the internal
949 // expected naming of the Target and TargetOptions structs.
950 // To ensure compatibility is retained, the built-in targets
951 // are round-tripped through this code to catch cases where
952 // the JSON parser is not updated to match the structs.
954 let get_req_field = |name: &str| {
956 .map(|s| s.as_string())
957 .and_then(|os| os.map(|s| s.to_string()))
958 .ok_or_else(|| format!("Field {} in target specification is required", name))
961 let get_opt_field = |name: &str, default: &str| {
963 .and_then(|s| s.as_string())
964 .map(|s| s.to_string())
965 .unwrap_or_else(|| default.to_string())
968 let mut base = Target {
969 llvm_target: get_req_field("llvm-target")?,
970 target_endian: get_req_field("target-endian")?,
971 target_pointer_width: get_req_field("target-pointer-width")?,
972 target_c_int_width: get_req_field("target-c-int-width")?,
973 data_layout: get_req_field("data-layout")?,
974 arch: get_req_field("arch")?,
975 target_os: get_req_field("os")?,
976 target_env: get_opt_field("env", ""),
977 target_vendor: get_opt_field("vendor", "unknown"),
978 linker_flavor: LinkerFlavor::from_str(&*get_req_field("linker-flavor")?)
979 .ok_or_else(|| format!("linker flavor must be {}", LinkerFlavor::one_of()))?,
980 options: Default::default(),
984 ($key_name:ident) => ( {
985 let name = (stringify!($key_name)).replace("_", "-");
986 obj.find(&name[..]).map(|o| o.as_string()
987 .map(|s| base.options.$key_name = s.to_string()));
989 ($key_name:ident, bool) => ( {
990 let name = (stringify!($key_name)).replace("_", "-");
992 .map(|o| o.as_boolean()
993 .map(|s| base.options.$key_name = s));
995 ($key_name:ident, Option<u64>) => ( {
996 let name = (stringify!($key_name)).replace("_", "-");
999 .map(|s| base.options.$key_name = Some(s)));
1001 ($key_name:ident, MergeFunctions) => ( {
1002 let name = (stringify!($key_name)).replace("_", "-");
1003 obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
1004 match s.parse::<MergeFunctions>() {
1005 Ok(mergefunc) => base.options.$key_name = mergefunc,
1006 _ => return Some(Err(format!("'{}' is not a valid value for \
1007 merge-functions. Use 'disabled', \
1008 'trampolines', or 'aliases'.",
1012 })).unwrap_or(Ok(()))
1014 ($key_name:ident, PanicStrategy) => ( {
1015 let name = (stringify!($key_name)).replace("_", "-");
1016 obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
1018 "unwind" => base.options.$key_name = PanicStrategy::Unwind,
1019 "abort" => base.options.$key_name = PanicStrategy::Abort,
1020 _ => return Some(Err(format!("'{}' is not a valid value for \
1021 panic-strategy. Use 'unwind' or 'abort'.",
1025 })).unwrap_or(Ok(()))
1027 ($key_name:ident, RelroLevel) => ( {
1028 let name = (stringify!($key_name)).replace("_", "-");
1029 obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
1030 match s.parse::<RelroLevel>() {
1031 Ok(level) => base.options.$key_name = level,
1032 _ => return Some(Err(format!("'{}' is not a valid value for \
1033 relro-level. Use 'full', 'partial, or 'off'.",
1037 })).unwrap_or(Ok(()))
1039 ($key_name:ident, list) => ( {
1040 let name = (stringify!($key_name)).replace("_", "-");
1041 obj.find(&name[..]).map(|o| o.as_array()
1042 .map(|v| base.options.$key_name = v.iter()
1043 .map(|a| a.as_string().unwrap().to_string()).collect()
1047 ($key_name:ident, opt_list) => ( {
1048 let name = (stringify!($key_name)).replace("_", "-");
1049 obj.find(&name[..]).map(|o| o.as_array()
1050 .map(|v| base.options.$key_name = Some(v.iter()
1051 .map(|a| a.as_string().unwrap().to_string()).collect())
1055 ($key_name:ident, optional) => ( {
1056 let name = (stringify!($key_name)).replace("_", "-");
1057 if let Some(o) = obj.find(&name[..]) {
1058 base.options.$key_name = o
1060 .map(|s| s.to_string() );
1063 ($key_name:ident, LldFlavor) => ( {
1064 let name = (stringify!($key_name)).replace("_", "-");
1065 obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
1066 if let Some(flavor) = LldFlavor::from_str(&s) {
1067 base.options.$key_name = flavor;
1069 return Some(Err(format!(
1070 "'{}' is not a valid value for lld-flavor. \
1071 Use 'darwin', 'gnu', 'link' or 'wasm.",
1075 })).unwrap_or(Ok(()))
1077 ($key_name:ident, LinkerFlavor) => ( {
1078 let name = (stringify!($key_name)).replace("_", "-");
1079 obj.find(&name[..]).and_then(|o| o.as_string().map(|s| {
1080 LinkerFlavor::from_str(&s).ok_or_else(|| {
1081 Err(format!("'{}' is not a valid value for linker-flavor. \
1082 Use 'em', 'gcc', 'ld' or 'msvc.", s))
1084 })).unwrap_or(Ok(()))
1086 ($key_name:ident, link_args) => ( {
1087 let name = (stringify!($key_name)).replace("_", "-");
1088 if let Some(val) = obj.find(&name[..]) {
1089 let obj = val.as_object().ok_or_else(|| format!("{}: expected a \
1090 JSON object with fields per linker-flavor.", name))?;
1091 let mut args = LinkArgs::new();
1093 let flavor = LinkerFlavor::from_str(&k).ok_or_else(|| {
1094 format!("{}: '{}' is not a valid value for linker-flavor. \
1095 Use 'em', 'gcc', 'ld' or 'msvc'", name, k)
1098 let v = v.as_array().ok_or_else(||
1099 format!("{}.{}: expected a JSON array", name, k)
1100 )?.iter().enumerate()
1102 let s = s.as_string().ok_or_else(||
1103 format!("{}.{}[{}]: expected a JSON string", name, k, i))?;
1106 .collect::<Result<Vec<_>, String>>()?;
1108 args.insert(flavor, v);
1110 base.options.$key_name = args;
1113 ($key_name:ident, env) => ( {
1114 let name = (stringify!($key_name)).replace("_", "-");
1115 if let Some(a) = obj.find(&name[..]).and_then(|o| o.as_array()) {
1117 if let Some(s) = o.as_string() {
1118 let p = s.split('=').collect::<Vec<_>>();
1120 let k = p[0].to_string();
1121 let v = p[1].to_string();
1122 base.options.$key_name.push((k, v));
1130 key!(is_builtin, bool);
1131 key!(linker, optional);
1132 key!(lld_flavor, LldFlavor)?;
1133 key!(pre_link_args, link_args);
1134 key!(pre_link_args_crt, link_args);
1135 key!(pre_link_objects_exe, list);
1136 key!(pre_link_objects_exe_crt, list);
1137 key!(pre_link_objects_dll, list);
1138 key!(late_link_args, link_args);
1139 key!(late_link_args_dynamic, link_args);
1140 key!(late_link_args_static, link_args);
1141 key!(post_link_objects, list);
1142 key!(post_link_objects_crt, list);
1143 key!(post_link_args, link_args);
1144 key!(link_env, env);
1145 key!(link_env_remove, list);
1146 key!(asm_args, list);
1149 key!(dynamic_linking, bool);
1150 key!(only_cdylib, bool);
1151 key!(executables, bool);
1152 key!(relocation_model);
1153 key!(code_model, optional);
1155 key!(disable_redzone, bool);
1156 key!(eliminate_frame_pointer, bool);
1157 key!(function_sections, bool);
1161 key!(staticlib_prefix);
1162 key!(staticlib_suffix);
1163 key!(target_family, optional);
1164 key!(abi_return_struct_as_int, bool);
1165 key!(is_like_osx, bool);
1166 key!(is_like_solaris, bool);
1167 key!(is_like_windows, bool);
1168 key!(is_like_msvc, bool);
1169 key!(is_like_emscripten, bool);
1170 key!(is_like_android, bool);
1171 key!(is_like_fuchsia, bool);
1172 key!(linker_is_gnu, bool);
1173 key!(allows_weak_linkage, bool);
1174 key!(has_rpath, bool);
1175 key!(no_default_libraries, bool);
1176 key!(position_independent_executables, bool);
1177 key!(needs_plt, bool);
1178 key!(relro_level, RelroLevel)?;
1179 key!(archive_format);
1180 key!(allow_asm, bool);
1181 key!(main_needs_argc_argv, bool);
1182 key!(has_elf_tls, bool);
1183 key!(obj_is_bitcode, bool);
1184 key!(max_atomic_width, Option<u64>);
1185 key!(min_atomic_width, Option<u64>);
1186 key!(atomic_cas, bool);
1187 key!(panic_strategy, PanicStrategy)?;
1188 key!(crt_static_allows_dylibs, bool);
1189 key!(crt_static_default, bool);
1190 key!(crt_static_respected, bool);
1191 key!(stack_probes, bool);
1192 key!(min_global_align, Option<u64>);
1193 key!(default_codegen_units, Option<u64>);
1194 key!(trap_unreachable, bool);
1195 key!(requires_lto, bool);
1196 key!(singlethread, bool);
1197 key!(no_builtins, bool);
1198 key!(codegen_backend);
1199 key!(default_hidden_visibility, bool);
1200 key!(emit_debug_gdb_scripts, bool);
1201 key!(requires_uwtable, bool);
1202 key!(simd_types_indirect, bool);
1203 key!(limit_rdylib_exports, bool);
1204 key!(override_export_symbols, opt_list);
1205 key!(merge_functions, MergeFunctions)?;
1206 key!(target_mcount);
1208 key!(relax_elf_relocations, bool);
1209 key!(llvm_args, list);
1211 if let Some(array) = obj.find("abi-blacklist").and_then(Json::as_array) {
1212 for name in array.iter().filter_map(|abi| abi.as_string()) {
1213 match lookup_abi(name) {
1217 "The ABI \"{}\" is considered to be supported on \
1218 all targets and cannot be blacklisted",
1223 base.options.abi_blacklist.push(abi)
1226 return Err(format!("Unknown ABI \"{}\" in target specification", name));
1235 /// Search RUST_TARGET_PATH for a JSON file specifying the given target
1236 /// triple. Note that it could also just be a bare filename already, so also
1237 /// check for that. If one of the hardcoded targets we know about, just
1238 /// return it directly.
1240 /// The error string could come from any of the APIs called, including
1241 /// filesystem access and JSON decoding.
1242 pub fn search(target_triple: &TargetTriple) -> Result<Target, String> {
1243 use rustc_serialize::json;
1247 fn load_file(path: &Path) -> Result<Target, String> {
1248 let contents = fs::read(path).map_err(|e| e.to_string())?;
1249 let obj = json::from_reader(&mut &contents[..]).map_err(|e| e.to_string())?;
1250 Target::from_json(obj)
1253 match *target_triple {
1254 TargetTriple::TargetTriple(ref target_triple) => {
1255 // check if triple is in list of supported targets
1256 match load_specific(target_triple) {
1257 Ok(t) => return Ok(t),
1258 Err(LoadTargetError::BuiltinTargetNotFound(_)) => (),
1259 Err(LoadTargetError::Other(e)) => return Err(e),
1262 // search for a file named `target_triple`.json in RUST_TARGET_PATH
1264 let mut target = target_triple.to_string();
1265 target.push_str(".json");
1266 PathBuf::from(target)
1269 let target_path = env::var_os("RUST_TARGET_PATH").unwrap_or_default();
1271 // FIXME 16351: add a sane default search path?
1273 for dir in env::split_paths(&target_path) {
1274 let p = dir.join(&path);
1276 return load_file(&p);
1279 Err(format!("Could not find specification for target {:?}", target_triple))
1281 TargetTriple::TargetPath(ref target_path) => {
1282 if target_path.is_file() {
1283 return load_file(&target_path);
1285 Err(format!("Target path {:?} is not a valid file", target_path))
1291 impl ToJson for Target {
1292 fn to_json(&self) -> Json {
1293 let mut d = BTreeMap::new();
1294 let default: TargetOptions = Default::default();
1296 macro_rules! target_val {
1298 let name = (stringify!($attr)).replace("_", "-");
1299 d.insert(name, self.$attr.to_json());
1301 ($attr:ident, $key_name:expr) => {{
1302 let name = $key_name;
1303 d.insert(name.to_string(), self.$attr.to_json());
1307 macro_rules! target_option_val {
1309 let name = (stringify!($attr)).replace("_", "-");
1310 if default.$attr != self.options.$attr {
1311 d.insert(name, self.options.$attr.to_json());
1314 ($attr:ident, $key_name:expr) => {{
1315 let name = $key_name;
1316 if default.$attr != self.options.$attr {
1317 d.insert(name.to_string(), self.options.$attr.to_json());
1320 (link_args - $attr:ident) => {{
1321 let name = (stringify!($attr)).replace("_", "-");
1322 if default.$attr != self.options.$attr {
1327 .map(|(k, v)| (k.desc().to_owned(), v.clone()))
1328 .collect::<BTreeMap<_, _>>();
1329 d.insert(name, obj.to_json());
1332 (env - $attr:ident) => {{
1333 let name = (stringify!($attr)).replace("_", "-");
1334 if default.$attr != self.options.$attr {
1339 .map(|&(ref k, ref v)| k.clone() + "=" + &v)
1340 .collect::<Vec<_>>();
1341 d.insert(name, obj.to_json());
1346 target_val!(llvm_target);
1347 target_val!(target_endian);
1348 target_val!(target_pointer_width);
1349 target_val!(target_c_int_width);
1351 target_val!(target_os, "os");
1352 target_val!(target_env, "env");
1353 target_val!(target_vendor, "vendor");
1354 target_val!(data_layout);
1355 target_val!(linker_flavor);
1357 target_option_val!(is_builtin);
1358 target_option_val!(linker);
1359 target_option_val!(lld_flavor);
1360 target_option_val!(link_args - pre_link_args);
1361 target_option_val!(link_args - pre_link_args_crt);
1362 target_option_val!(pre_link_objects_exe);
1363 target_option_val!(pre_link_objects_exe_crt);
1364 target_option_val!(pre_link_objects_dll);
1365 target_option_val!(link_args - late_link_args);
1366 target_option_val!(link_args - late_link_args_dynamic);
1367 target_option_val!(link_args - late_link_args_static);
1368 target_option_val!(post_link_objects);
1369 target_option_val!(post_link_objects_crt);
1370 target_option_val!(link_args - post_link_args);
1371 target_option_val!(env - link_env);
1372 target_option_val!(link_env_remove);
1373 target_option_val!(asm_args);
1374 target_option_val!(cpu);
1375 target_option_val!(features);
1376 target_option_val!(dynamic_linking);
1377 target_option_val!(only_cdylib);
1378 target_option_val!(executables);
1379 target_option_val!(relocation_model);
1380 target_option_val!(code_model);
1381 target_option_val!(tls_model);
1382 target_option_val!(disable_redzone);
1383 target_option_val!(eliminate_frame_pointer);
1384 target_option_val!(function_sections);
1385 target_option_val!(dll_prefix);
1386 target_option_val!(dll_suffix);
1387 target_option_val!(exe_suffix);
1388 target_option_val!(staticlib_prefix);
1389 target_option_val!(staticlib_suffix);
1390 target_option_val!(target_family);
1391 target_option_val!(abi_return_struct_as_int);
1392 target_option_val!(is_like_osx);
1393 target_option_val!(is_like_solaris);
1394 target_option_val!(is_like_windows);
1395 target_option_val!(is_like_msvc);
1396 target_option_val!(is_like_emscripten);
1397 target_option_val!(is_like_android);
1398 target_option_val!(is_like_fuchsia);
1399 target_option_val!(linker_is_gnu);
1400 target_option_val!(allows_weak_linkage);
1401 target_option_val!(has_rpath);
1402 target_option_val!(no_default_libraries);
1403 target_option_val!(position_independent_executables);
1404 target_option_val!(needs_plt);
1405 target_option_val!(relro_level);
1406 target_option_val!(archive_format);
1407 target_option_val!(allow_asm);
1408 target_option_val!(main_needs_argc_argv);
1409 target_option_val!(has_elf_tls);
1410 target_option_val!(obj_is_bitcode);
1411 target_option_val!(min_atomic_width);
1412 target_option_val!(max_atomic_width);
1413 target_option_val!(atomic_cas);
1414 target_option_val!(panic_strategy);
1415 target_option_val!(crt_static_allows_dylibs);
1416 target_option_val!(crt_static_default);
1417 target_option_val!(crt_static_respected);
1418 target_option_val!(stack_probes);
1419 target_option_val!(min_global_align);
1420 target_option_val!(default_codegen_units);
1421 target_option_val!(trap_unreachable);
1422 target_option_val!(requires_lto);
1423 target_option_val!(singlethread);
1424 target_option_val!(no_builtins);
1425 target_option_val!(codegen_backend);
1426 target_option_val!(default_hidden_visibility);
1427 target_option_val!(emit_debug_gdb_scripts);
1428 target_option_val!(requires_uwtable);
1429 target_option_val!(simd_types_indirect);
1430 target_option_val!(limit_rdylib_exports);
1431 target_option_val!(override_export_symbols);
1432 target_option_val!(merge_functions);
1433 target_option_val!(target_mcount);
1434 target_option_val!(llvm_abiname);
1435 target_option_val!(relax_elf_relocations);
1436 target_option_val!(llvm_args);
1438 if default.abi_blacklist != self.options.abi_blacklist {
1440 "abi-blacklist".to_string(),
1444 .map(|&name| Abi::name(name).to_json())
1445 .collect::<Vec<_>>()
1454 /// Either a target triple string or a path to a JSON file.
1455 #[derive(PartialEq, Clone, Debug, Hash, RustcEncodable, RustcDecodable)]
1456 pub enum TargetTriple {
1457 TargetTriple(String),
1458 TargetPath(PathBuf),
1462 /// Creates a target triple from the passed target triple string.
1463 pub fn from_triple(triple: &str) -> Self {
1464 TargetTriple::TargetTriple(triple.to_string())
1467 /// Creates a target triple from the passed target path.
1468 pub fn from_path(path: &Path) -> Result<Self, io::Error> {
1469 let canonicalized_path = path.canonicalize()?;
1470 Ok(TargetTriple::TargetPath(canonicalized_path))
1473 /// Returns a string triple for this target.
1475 /// If this target is a path, the file name (without extension) is returned.
1476 pub fn triple(&self) -> &str {
1478 TargetTriple::TargetTriple(ref triple) => triple,
1479 TargetTriple::TargetPath(ref path) => path
1481 .expect("target path must not be empty")
1483 .expect("target path must be valid unicode"),
1487 /// Returns an extended string triple for this target.
1489 /// If this target is a path, a hash of the path is appended to the triple returned
1491 pub fn debug_triple(&self) -> String {
1492 use std::collections::hash_map::DefaultHasher;
1493 use std::hash::{Hash, Hasher};
1495 let triple = self.triple();
1496 if let TargetTriple::TargetPath(ref path) = *self {
1497 let mut hasher = DefaultHasher::new();
1498 path.hash(&mut hasher);
1499 let hash = hasher.finish();
1500 format!("{}-{}", triple, hash)
1507 impl fmt::Display for TargetTriple {
1508 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
1509 write!(f, "{}", self.debug_triple())