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 rustc_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};
56 mod linux_kernel_base;
63 mod windows_msvc_base;
65 mod windows_uwp_msvc_base;
74 #[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
75 pub enum LinkerFlavor {
84 #[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
93 fn from_str(s: &str) -> Option<Self> {
95 "darwin" => LldFlavor::Ld64,
96 "gnu" => LldFlavor::Ld,
97 "link" => LldFlavor::Link,
98 "wasm" => LldFlavor::Wasm,
104 impl ToJson for LldFlavor {
105 fn to_json(&self) -> Json {
107 LldFlavor::Ld64 => "darwin",
108 LldFlavor::Ld => "gnu",
109 LldFlavor::Link => "link",
110 LldFlavor::Wasm => "wasm",
115 impl ToJson for LinkerFlavor {
116 fn to_json(&self) -> Json {
117 self.desc().to_json()
120 macro_rules! flavor_mappings {
121 ($((($($flavor:tt)*), $string:expr),)*) => (
123 pub const fn one_of() -> &'static str {
124 concat!("one of: ", $($string, " ",)*)
127 pub fn from_str(s: &str) -> Option<Self> {
129 $($string => $($flavor)*,)*
134 pub fn desc(&self) -> &str {
136 $($($flavor)* => $string,)*
145 ((LinkerFlavor::Em), "em"),
146 ((LinkerFlavor::Gcc), "gcc"),
147 ((LinkerFlavor::Ld), "ld"),
148 ((LinkerFlavor::Msvc), "msvc"),
149 ((LinkerFlavor::PtxLinker), "ptx-linker"),
150 ((LinkerFlavor::Lld(LldFlavor::Wasm)), "wasm-ld"),
151 ((LinkerFlavor::Lld(LldFlavor::Ld64)), "ld64.lld"),
152 ((LinkerFlavor::Lld(LldFlavor::Ld)), "ld.lld"),
153 ((LinkerFlavor::Lld(LldFlavor::Link)), "lld-link"),
156 #[derive(Clone, Copy, Debug, PartialEq, Hash, RustcEncodable, RustcDecodable)]
157 pub enum PanicStrategy {
163 pub fn desc(&self) -> &str {
165 PanicStrategy::Unwind => "unwind",
166 PanicStrategy::Abort => "abort",
171 impl ToJson for PanicStrategy {
172 fn to_json(&self) -> Json {
174 PanicStrategy::Abort => "abort".to_json(),
175 PanicStrategy::Unwind => "unwind".to_json(),
180 #[derive(Clone, Copy, Debug, PartialEq, Hash, RustcEncodable, RustcDecodable)]
181 pub enum RelroLevel {
189 pub fn desc(&self) -> &str {
191 RelroLevel::Full => "full",
192 RelroLevel::Partial => "partial",
193 RelroLevel::Off => "off",
194 RelroLevel::None => "none",
199 impl FromStr for RelroLevel {
202 fn from_str(s: &str) -> Result<RelroLevel, ()> {
204 "full" => Ok(RelroLevel::Full),
205 "partial" => Ok(RelroLevel::Partial),
206 "off" => Ok(RelroLevel::Off),
207 "none" => Ok(RelroLevel::None),
213 impl ToJson for RelroLevel {
214 fn to_json(&self) -> Json {
216 RelroLevel::Full => "full".to_json(),
217 RelroLevel::Partial => "partial".to_json(),
218 RelroLevel::Off => "off".to_json(),
219 RelroLevel::None => "None".to_json(),
224 #[derive(Clone, Copy, Debug, PartialEq, Hash, RustcEncodable, RustcDecodable)]
225 pub enum MergeFunctions {
231 impl MergeFunctions {
232 pub fn desc(&self) -> &str {
234 MergeFunctions::Disabled => "disabled",
235 MergeFunctions::Trampolines => "trampolines",
236 MergeFunctions::Aliases => "aliases",
241 impl FromStr for MergeFunctions {
244 fn from_str(s: &str) -> Result<MergeFunctions, ()> {
246 "disabled" => Ok(MergeFunctions::Disabled),
247 "trampolines" => Ok(MergeFunctions::Trampolines),
248 "aliases" => Ok(MergeFunctions::Aliases),
254 impl ToJson for MergeFunctions {
255 fn to_json(&self) -> Json {
257 MergeFunctions::Disabled => "disabled".to_json(),
258 MergeFunctions::Trampolines => "trampolines".to_json(),
259 MergeFunctions::Aliases => "aliases".to_json(),
264 pub enum LoadTargetError {
265 BuiltinTargetNotFound(String),
269 pub type LinkArgs = BTreeMap<LinkerFlavor, Vec<String>>;
270 pub type TargetResult = Result<Target, String>;
272 macro_rules! supported_targets {
273 ( $(($( $triple:literal, )+ $module:ident ),)+ ) => {
276 /// List of supported targets
277 const TARGETS: &[&str] = &[$($($triple),+),+];
279 fn load_specific(target: &str) -> Result<Target, LoadTargetError> {
283 let mut t = $module::target()
284 .map_err(LoadTargetError::Other)?;
285 t.options.is_builtin = true;
287 // round-trip through the JSON parser to ensure at
288 // run-time that the parser works correctly
289 t = Target::from_json(t.to_json())
290 .map_err(LoadTargetError::Other)?;
291 debug!("got builtin target: {:?}", t);
295 _ => Err(LoadTargetError::BuiltinTargetNotFound(
296 format!("Unable to find target: {}", target)))
300 pub fn get_targets() -> impl Iterator<Item = String> {
301 TARGETS.iter().filter_map(|t| -> Option<String> {
303 .and(Ok(t.to_string()))
309 mod test_json_encode_decode {
310 use rustc_serialize::json::ToJson;
312 $(use super::$module;)+
315 #[test] // `#[test]` - this is hard to put into a separate file, make an exception
317 // Grab the TargetResult struct. If we successfully retrieved
318 // a Target, then the test JSON encoding/decoding can run for this
319 // Target on this testing platform (i.e., checking the iOS targets
320 // only on a Mac test platform).
321 let _ = $module::target().map(|original| {
322 let as_json = original.to_json();
323 let parsed = Target::from_json(as_json).unwrap();
324 assert_eq!(original, parsed);
333 ("x86_64-unknown-linux-gnu", x86_64_unknown_linux_gnu),
334 ("x86_64-unknown-linux-gnux32", x86_64_unknown_linux_gnux32),
335 ("i686-unknown-linux-gnu", i686_unknown_linux_gnu),
336 ("i586-unknown-linux-gnu", i586_unknown_linux_gnu),
337 ("mips-unknown-linux-gnu", mips_unknown_linux_gnu),
338 ("mips64-unknown-linux-gnuabi64", mips64_unknown_linux_gnuabi64),
339 ("mips64el-unknown-linux-gnuabi64", mips64el_unknown_linux_gnuabi64),
340 ("mipsisa32r6-unknown-linux-gnu", mipsisa32r6_unknown_linux_gnu),
341 ("mipsisa32r6el-unknown-linux-gnu", mipsisa32r6el_unknown_linux_gnu),
342 ("mipsisa64r6-unknown-linux-gnuabi64", mipsisa64r6_unknown_linux_gnuabi64),
343 ("mipsisa64r6el-unknown-linux-gnuabi64", mipsisa64r6el_unknown_linux_gnuabi64),
344 ("mipsel-unknown-linux-gnu", mipsel_unknown_linux_gnu),
345 ("powerpc-unknown-linux-gnu", powerpc_unknown_linux_gnu),
346 ("powerpc-unknown-linux-gnuspe", powerpc_unknown_linux_gnuspe),
347 ("powerpc-unknown-linux-musl", powerpc_unknown_linux_musl),
348 ("powerpc64-unknown-linux-gnu", powerpc64_unknown_linux_gnu),
349 ("powerpc64-unknown-linux-musl", powerpc64_unknown_linux_musl),
350 ("powerpc64le-unknown-linux-gnu", powerpc64le_unknown_linux_gnu),
351 ("powerpc64le-unknown-linux-musl", powerpc64le_unknown_linux_musl),
352 ("s390x-unknown-linux-gnu", s390x_unknown_linux_gnu),
353 ("sparc-unknown-linux-gnu", sparc_unknown_linux_gnu),
354 ("sparc64-unknown-linux-gnu", sparc64_unknown_linux_gnu),
355 ("arm-unknown-linux-gnueabi", arm_unknown_linux_gnueabi),
356 ("arm-unknown-linux-gnueabihf", arm_unknown_linux_gnueabihf),
357 ("arm-unknown-linux-musleabi", arm_unknown_linux_musleabi),
358 ("arm-unknown-linux-musleabihf", arm_unknown_linux_musleabihf),
359 ("armv4t-unknown-linux-gnueabi", armv4t_unknown_linux_gnueabi),
360 ("armv5te-unknown-linux-gnueabi", armv5te_unknown_linux_gnueabi),
361 ("armv5te-unknown-linux-musleabi", armv5te_unknown_linux_musleabi),
362 ("armv7-unknown-linux-gnueabi", armv7_unknown_linux_gnueabi),
363 ("armv7-unknown-linux-gnueabihf", armv7_unknown_linux_gnueabihf),
364 ("thumbv7neon-unknown-linux-gnueabihf", thumbv7neon_unknown_linux_gnueabihf),
365 ("armv7-unknown-linux-musleabi", armv7_unknown_linux_musleabi),
366 ("armv7-unknown-linux-musleabihf", armv7_unknown_linux_musleabihf),
367 ("aarch64-unknown-linux-gnu", aarch64_unknown_linux_gnu),
368 ("aarch64-unknown-linux-musl", aarch64_unknown_linux_musl),
369 ("x86_64-unknown-linux-musl", x86_64_unknown_linux_musl),
370 ("i686-unknown-linux-musl", i686_unknown_linux_musl),
371 ("i586-unknown-linux-musl", i586_unknown_linux_musl),
372 ("mips-unknown-linux-musl", mips_unknown_linux_musl),
373 ("mipsel-unknown-linux-musl", mipsel_unknown_linux_musl),
374 ("mips64-unknown-linux-muslabi64", mips64_unknown_linux_muslabi64),
375 ("mips64el-unknown-linux-muslabi64", mips64el_unknown_linux_muslabi64),
376 ("hexagon-unknown-linux-musl", hexagon_unknown_linux_musl),
378 ("mips-unknown-linux-uclibc", mips_unknown_linux_uclibc),
379 ("mipsel-unknown-linux-uclibc", mipsel_unknown_linux_uclibc),
381 ("i686-linux-android", i686_linux_android),
382 ("x86_64-linux-android", x86_64_linux_android),
383 ("arm-linux-androideabi", arm_linux_androideabi),
384 ("armv7-linux-androideabi", armv7_linux_androideabi),
385 ("thumbv7neon-linux-androideabi", thumbv7neon_linux_androideabi),
386 ("aarch64-linux-android", aarch64_linux_android),
388 ("x86_64-linux-kernel", x86_64_linux_kernel),
390 ("aarch64-unknown-freebsd", aarch64_unknown_freebsd),
391 ("armv6-unknown-freebsd", armv6_unknown_freebsd),
392 ("armv7-unknown-freebsd", armv7_unknown_freebsd),
393 ("i686-unknown-freebsd", i686_unknown_freebsd),
394 ("powerpc64-unknown-freebsd", powerpc64_unknown_freebsd),
395 ("x86_64-unknown-freebsd", x86_64_unknown_freebsd),
397 ("i686-unknown-dragonfly", i686_unknown_dragonfly),
398 ("x86_64-unknown-dragonfly", x86_64_unknown_dragonfly),
400 ("aarch64-unknown-openbsd", aarch64_unknown_openbsd),
401 ("i686-unknown-openbsd", i686_unknown_openbsd),
402 ("sparc64-unknown-openbsd", sparc64_unknown_openbsd),
403 ("x86_64-unknown-openbsd", x86_64_unknown_openbsd),
405 ("aarch64-unknown-netbsd", aarch64_unknown_netbsd),
406 ("armv6-unknown-netbsd-eabihf", armv6_unknown_netbsd_eabihf),
407 ("armv7-unknown-netbsd-eabihf", armv7_unknown_netbsd_eabihf),
408 ("i686-unknown-netbsd", i686_unknown_netbsd),
409 ("powerpc-unknown-netbsd", powerpc_unknown_netbsd),
410 ("sparc64-unknown-netbsd", sparc64_unknown_netbsd),
411 ("x86_64-unknown-netbsd", x86_64_unknown_netbsd),
412 ("x86_64-rumprun-netbsd", x86_64_rumprun_netbsd),
414 ("i686-unknown-haiku", i686_unknown_haiku),
415 ("x86_64-unknown-haiku", x86_64_unknown_haiku),
417 ("x86_64-apple-darwin", x86_64_apple_darwin),
418 ("i686-apple-darwin", i686_apple_darwin),
420 ("aarch64-fuchsia", aarch64_fuchsia),
421 ("x86_64-fuchsia", x86_64_fuchsia),
423 ("x86_64-unknown-l4re-uclibc", x86_64_unknown_l4re_uclibc),
425 ("aarch64-unknown-redox", aarch64_unknown_redox),
426 ("x86_64-unknown-redox", x86_64_unknown_redox),
428 ("i386-apple-ios", i386_apple_ios),
429 ("x86_64-apple-ios", x86_64_apple_ios),
430 ("aarch64-apple-ios", aarch64_apple_ios),
431 ("armv7-apple-ios", armv7_apple_ios),
432 ("armv7s-apple-ios", armv7s_apple_ios),
433 ("x86_64-apple-ios-macabi", x86_64_apple_ios_macabi),
435 ("armebv7r-none-eabi", armebv7r_none_eabi),
436 ("armebv7r-none-eabihf", armebv7r_none_eabihf),
437 ("armv7r-none-eabi", armv7r_none_eabi),
438 ("armv7r-none-eabihf", armv7r_none_eabihf),
440 // `x86_64-pc-solaris` is an alias for `x86_64_sun_solaris` for backwards compatibility reasons.
441 // (See <https://github.com/rust-lang/rust/issues/40531>.)
442 ("x86_64-sun-solaris", "x86_64-pc-solaris", x86_64_sun_solaris),
443 ("sparcv9-sun-solaris", sparcv9_sun_solaris),
445 ("x86_64-pc-windows-gnu", x86_64_pc_windows_gnu),
446 ("i686-pc-windows-gnu", i686_pc_windows_gnu),
447 ("i686-uwp-windows-gnu", i686_uwp_windows_gnu),
448 ("x86_64-uwp-windows-gnu", x86_64_uwp_windows_gnu),
450 ("aarch64-pc-windows-msvc", aarch64_pc_windows_msvc),
451 ("aarch64-uwp-windows-msvc", aarch64_uwp_windows_msvc),
452 ("x86_64-pc-windows-msvc", x86_64_pc_windows_msvc),
453 ("x86_64-uwp-windows-msvc", x86_64_uwp_windows_msvc),
454 ("i686-pc-windows-msvc", i686_pc_windows_msvc),
455 ("i686-uwp-windows-msvc", i686_uwp_windows_msvc),
456 ("i586-pc-windows-msvc", i586_pc_windows_msvc),
457 ("thumbv7a-pc-windows-msvc", thumbv7a_pc_windows_msvc),
459 ("asmjs-unknown-emscripten", asmjs_unknown_emscripten),
460 ("wasm32-unknown-emscripten", wasm32_unknown_emscripten),
461 ("wasm32-unknown-unknown", wasm32_unknown_unknown),
462 ("wasm32-wasi", wasm32_wasi),
464 ("thumbv6m-none-eabi", thumbv6m_none_eabi),
465 ("thumbv7m-none-eabi", thumbv7m_none_eabi),
466 ("thumbv7em-none-eabi", thumbv7em_none_eabi),
467 ("thumbv7em-none-eabihf", thumbv7em_none_eabihf),
468 ("thumbv8m.base-none-eabi", thumbv8m_base_none_eabi),
469 ("thumbv8m.main-none-eabi", thumbv8m_main_none_eabi),
470 ("thumbv8m.main-none-eabihf", thumbv8m_main_none_eabihf),
472 ("msp430-none-elf", msp430_none_elf),
474 ("aarch64-unknown-cloudabi", aarch64_unknown_cloudabi),
475 ("armv7-unknown-cloudabi-eabihf", armv7_unknown_cloudabi_eabihf),
476 ("i686-unknown-cloudabi", i686_unknown_cloudabi),
477 ("x86_64-unknown-cloudabi", x86_64_unknown_cloudabi),
479 ("aarch64-unknown-hermit", aarch64_unknown_hermit),
480 ("x86_64-unknown-hermit", x86_64_unknown_hermit),
482 ("riscv32i-unknown-none-elf", riscv32i_unknown_none_elf),
483 ("riscv32imc-unknown-none-elf", riscv32imc_unknown_none_elf),
484 ("riscv32imac-unknown-none-elf", riscv32imac_unknown_none_elf),
485 ("riscv64imac-unknown-none-elf", riscv64imac_unknown_none_elf),
486 ("riscv64gc-unknown-none-elf", riscv64gc_unknown_none_elf),
488 ("aarch64-unknown-none", aarch64_unknown_none),
489 ("aarch64-unknown-none-softfloat", aarch64_unknown_none_softfloat),
491 ("x86_64-fortanix-unknown-sgx", x86_64_fortanix_unknown_sgx),
493 ("x86_64-unknown-uefi", x86_64_unknown_uefi),
494 ("i686-unknown-uefi", i686_unknown_uefi),
496 ("nvptx64-nvidia-cuda", nvptx64_nvidia_cuda),
498 ("i686-wrs-vxworks", i686_wrs_vxworks),
499 ("x86_64-wrs-vxworks", x86_64_wrs_vxworks),
500 ("armv7-wrs-vxworks-eabihf", armv7_wrs_vxworks_eabihf),
501 ("aarch64-wrs-vxworks", aarch64_wrs_vxworks),
502 ("powerpc-wrs-vxworks", powerpc_wrs_vxworks),
503 ("powerpc-wrs-vxworks-spe", powerpc_wrs_vxworks_spe),
504 ("powerpc64-wrs-vxworks", powerpc64_wrs_vxworks),
507 /// Everything `rustc` knows about how to compile for a specific target.
509 /// Every field here must be specified, and has no default value.
510 #[derive(PartialEq, Clone, Debug)]
512 /// Target triple to pass to LLVM.
513 pub llvm_target: String,
514 /// String to use as the `target_endian` `cfg` variable.
515 pub target_endian: String,
516 /// String to use as the `target_pointer_width` `cfg` variable.
517 pub target_pointer_width: String,
518 /// Width of c_int type
519 pub target_c_int_width: String,
520 /// OS name to use for conditional compilation.
521 pub target_os: String,
522 /// Environment name to use for conditional compilation.
523 pub target_env: String,
524 /// Vendor name to use for conditional compilation.
525 pub target_vendor: String,
526 /// Architecture to use for ABI considerations. Valid options include: "x86",
527 /// "x86_64", "arm", "aarch64", "mips", "powerpc", "powerpc64", and others.
529 /// [Data layout](http://llvm.org/docs/LangRef.html#data-layout) to pass to LLVM.
530 pub data_layout: String,
532 pub linker_flavor: LinkerFlavor,
533 /// Optional settings with defaults.
534 pub options: TargetOptions,
537 pub trait HasTargetSpec {
538 fn target_spec(&self) -> &Target;
541 impl HasTargetSpec for Target {
542 fn target_spec(&self) -> &Target {
547 /// Optional aspects of a target specification.
549 /// This has an implementation of `Default`, see each field for what the default is. In general,
550 /// these try to take "minimal defaults" that don't assume anything about the runtime they run in.
551 #[derive(PartialEq, Clone, Debug)]
552 pub struct TargetOptions {
553 /// Whether the target is built-in or loaded from a custom target specification.
554 pub is_builtin: bool,
557 pub linker: Option<String>,
560 pub lld_flavor: LldFlavor,
562 /// Linker arguments that are passed *before* any user-defined libraries.
563 pub pre_link_args: LinkArgs, // ... unconditionally
564 pub pre_link_args_crt: LinkArgs, // ... when linking with a bundled crt
565 /// Objects to link before all others, always found within the
567 pub pre_link_objects_exe: Vec<String>, // ... when linking an executable, unconditionally
568 pub pre_link_objects_exe_crt: Vec<String>, // ... when linking an executable with a bundled crt
569 pub pre_link_objects_dll: Vec<String>, // ... when linking a dylib
570 /// Linker arguments that are unconditionally passed after any
571 /// user-defined but before post_link_objects. Standard platform
572 /// libraries that should be always be linked to, usually go here.
573 pub late_link_args: LinkArgs,
574 /// Objects to link after all others, always found within the
576 pub post_link_objects: Vec<String>, // ... unconditionally
577 pub post_link_objects_crt: Vec<String>, // ... when linking with a bundled crt
578 /// Linker arguments that are unconditionally passed *after* any
579 /// user-defined libraries.
580 pub post_link_args: LinkArgs,
582 /// Environment variables to be set for the linker invocation.
583 pub link_env: Vec<(String, String)>,
584 /// Environment variables to be removed for the linker invocation.
585 pub link_env_remove: Vec<String>,
587 /// Extra arguments to pass to the external assembler (when used)
588 pub asm_args: Vec<String>,
590 /// Default CPU to pass to LLVM. Corresponds to `llc -mcpu=$cpu`. Defaults
593 /// Default target features to pass to LLVM. These features will *always* be
594 /// passed, and cannot be disabled even via `-C`. Corresponds to `llc
595 /// -mattr=$features`.
596 pub features: String,
597 /// Whether dynamic linking is available on this target. Defaults to false.
598 pub dynamic_linking: bool,
599 /// If dynamic linking is available, whether only cdylibs are supported.
600 pub only_cdylib: bool,
601 /// Whether executables are available on this target. iOS, for example, only allows static
602 /// libraries. Defaults to false.
603 pub executables: bool,
604 /// Relocation model to use in object file. Corresponds to `llc
605 /// -relocation-model=$relocation_model`. Defaults to "pic".
606 pub relocation_model: String,
607 /// Code model to use. Corresponds to `llc -code-model=$code_model`.
608 pub code_model: Option<String>,
609 /// TLS model to use. Options are "global-dynamic" (default), "local-dynamic", "initial-exec"
610 /// and "local-exec". This is similar to the -ftls-model option in GCC/Clang.
611 pub tls_model: String,
612 /// Do not emit code that uses the "red zone", if the ABI has one. Defaults to false.
613 pub disable_redzone: bool,
614 /// Eliminate frame pointers from stack frames if possible. Defaults to true.
615 pub eliminate_frame_pointer: bool,
616 /// Emit each function in its own section. Defaults to true.
617 pub function_sections: bool,
618 /// String to prepend to the name of every dynamic library. Defaults to "lib".
619 pub dll_prefix: String,
620 /// String to append to the name of every dynamic library. Defaults to ".so".
621 pub dll_suffix: String,
622 /// String to append to the name of every executable.
623 pub exe_suffix: String,
624 /// String to prepend to the name of every static library. Defaults to "lib".
625 pub staticlib_prefix: String,
626 /// String to append to the name of every static library. Defaults to ".a".
627 pub staticlib_suffix: String,
628 /// OS family to use for conditional compilation. Valid options: "unix", "windows".
629 pub target_family: Option<String>,
630 /// Whether the target toolchain's ABI supports returning small structs as an integer.
631 pub abi_return_struct_as_int: bool,
632 /// Whether the target toolchain is like macOS's. Only useful for compiling against iOS/macOS,
633 /// in particular running dsymutil and some other stuff like `-dead_strip`. Defaults to false.
634 pub is_like_osx: bool,
635 /// Whether the target toolchain is like Solaris's.
636 /// Only useful for compiling against Illumos/Solaris,
637 /// as they have a different set of linker flags. Defaults to false.
638 pub is_like_solaris: bool,
639 /// Whether the target toolchain is like Windows'. Only useful for compiling against Windows,
640 /// only really used for figuring out how to find libraries, since Windows uses its own
641 /// library naming convention. Defaults to false.
642 pub is_like_windows: bool,
643 pub is_like_msvc: bool,
644 /// Whether the target toolchain is like Android's. Only useful for compiling against Android.
645 /// Defaults to false.
646 pub is_like_android: bool,
647 /// Whether the target toolchain is like Emscripten's. Only useful for compiling with
648 /// Emscripten toolchain.
649 /// Defaults to false.
650 pub is_like_emscripten: bool,
651 /// Whether the target toolchain is like Fuchsia's.
652 pub is_like_fuchsia: bool,
653 /// Whether the linker support GNU-like arguments such as -O. Defaults to false.
654 pub linker_is_gnu: bool,
655 /// The MinGW toolchain has a known issue that prevents it from correctly
656 /// handling COFF object files with more than 2<sup>15</sup> sections. Since each weak
657 /// symbol needs its own COMDAT section, weak linkage implies a large
658 /// number sections that easily exceeds the given limit for larger
659 /// codebases. Consequently we want a way to disallow weak linkage on some
661 pub allows_weak_linkage: bool,
662 /// Whether the linker support rpaths or not. Defaults to false.
664 /// Whether to disable linking to the default libraries, typically corresponds
665 /// to `-nodefaultlibs`. Defaults to true.
666 pub no_default_libraries: bool,
667 /// Dynamically linked executables can be compiled as position independent
668 /// if the default relocation model of position independent code is not
669 /// changed. This is a requirement to take advantage of ASLR, as otherwise
670 /// the functions in the executable are not randomized and can be used
671 /// during an exploit of a vulnerability in any code.
672 pub position_independent_executables: bool,
673 /// Determines if the target always requires using the PLT for indirect
674 /// library calls or not. This controls the default value of the `-Z plt` flag.
676 /// Either partial, full, or off. Full RELRO makes the dynamic linker
677 /// resolve all symbols at startup and marks the GOT read-only before
678 /// starting the program, preventing overwriting the GOT.
679 pub relro_level: RelroLevel,
680 /// Format that archives should be emitted in. This affects whether we use
681 /// LLVM to assemble an archive or fall back to the system linker, and
682 /// currently only "gnu" is used to fall into LLVM. Unknown strings cause
683 /// the system linker to be used.
684 pub archive_format: String,
685 /// Is asm!() allowed? Defaults to true.
687 /// Whether the target uses a custom unwind resumption routine.
688 /// By default LLVM lowers `resume` instructions into calls to `_Unwind_Resume`
689 /// defined in libgcc. If this option is enabled, the target must provide
690 /// `eh_unwind_resume` lang item.
691 pub custom_unwind_resume: bool,
692 /// Whether the runtime startup code requires the `main` function be passed
693 /// `argc` and `argv` values.
694 pub main_needs_argc_argv: bool,
696 /// Flag indicating whether ELF TLS (e.g., #[thread_local]) is available for
698 pub has_elf_tls: bool,
699 // This is mainly for easy compatibility with emscripten.
700 // If we give emcc .o files that are actually .bc files it
702 pub obj_is_bitcode: bool,
704 // LLVM can't produce object files for this target. Instead, we'll make LLVM
705 // emit assembly and then use `gcc` to turn that assembly into an object
707 pub no_integrated_as: bool,
709 /// Don't use this field; instead use the `.min_atomic_width()` method.
710 pub min_atomic_width: Option<u64>,
712 /// Don't use this field; instead use the `.max_atomic_width()` method.
713 pub max_atomic_width: Option<u64>,
715 /// Whether the target supports atomic CAS operations natively
716 pub atomic_cas: bool,
718 /// Panic strategy: "unwind" or "abort"
719 pub panic_strategy: PanicStrategy,
721 /// A blacklist of ABIs unsupported by the current target. Note that generic
722 /// ABIs are considered to be supported on all platforms and cannot be blacklisted.
723 pub abi_blacklist: Vec<Abi>,
725 /// Whether or not linking dylibs to a static CRT is allowed.
726 pub crt_static_allows_dylibs: bool,
727 /// Whether or not the CRT is statically linked by default.
728 pub crt_static_default: bool,
729 /// Whether or not crt-static is respected by the compiler (or is a no-op).
730 pub crt_static_respected: bool,
732 /// Whether or not stack probes (__rust_probestack) are enabled
733 pub stack_probes: bool,
735 /// The minimum alignment for global symbols.
736 pub min_global_align: Option<u64>,
738 /// Default number of codegen units to use in debug mode
739 pub default_codegen_units: Option<u64>,
741 /// Whether to generate trap instructions in places where optimization would
742 /// otherwise produce control flow that falls through into unrelated memory.
743 pub trap_unreachable: bool,
745 /// This target requires everything to be compiled with LTO to emit a final
746 /// executable, aka there is no native linker for this target.
747 pub requires_lto: bool,
749 /// This target has no support for threads.
750 pub singlethread: bool,
752 /// Whether library functions call lowering/optimization is disabled in LLVM
753 /// for this target unconditionally.
754 pub no_builtins: bool,
756 /// The codegen backend to use for this target, typically "llvm"
757 pub codegen_backend: String,
759 /// The default visibility for symbols in this target should be "hidden"
760 /// rather than "default"
761 pub default_hidden_visibility: bool,
763 /// Whether or not bitcode is embedded in object files
764 pub embed_bitcode: bool,
766 /// Whether a .debug_gdb_scripts section will be added to the output object file
767 pub emit_debug_gdb_scripts: bool,
769 /// Whether or not to unconditionally `uwtable` attributes on functions,
770 /// typically because the platform needs to unwind for things like stack
772 pub requires_uwtable: bool,
774 /// Whether or not SIMD types are passed by reference in the Rust ABI,
775 /// typically required if a target can be compiled with a mixed set of
776 /// target features. This is `true` by default, and `false` for targets like
777 /// wasm32 where the whole program either has simd or not.
778 pub simd_types_indirect: bool,
780 /// Pass a list of symbol which should be exported in the dylib to the linker.
781 pub limit_rdylib_exports: bool,
783 /// If set, have the linker export exactly these symbols, instead of using
784 /// the usual logic to figure this out from the crate itself.
785 pub override_export_symbols: Option<Vec<String>>,
787 /// Determines how or whether the MergeFunctions LLVM pass should run for
788 /// this target. Either "disabled", "trampolines", or "aliases".
789 /// The MergeFunctions pass is generally useful, but some targets may need
790 /// to opt out. The default is "aliases".
792 /// Workaround for: https://github.com/rust-lang/rust/issues/57356
793 pub merge_functions: MergeFunctions,
795 /// Use platform dependent mcount function
796 pub target_mcount: String
799 impl Default for TargetOptions {
800 /// Creates a set of "sane defaults" for any target. This is still
801 /// incomplete, and if used for compilation, will certainly not work.
802 fn default() -> TargetOptions {
805 linker: option_env!("CFG_DEFAULT_LINKER").map(|s| s.to_string()),
806 lld_flavor: LldFlavor::Ld,
807 pre_link_args: LinkArgs::new(),
808 pre_link_args_crt: LinkArgs::new(),
809 post_link_args: LinkArgs::new(),
810 asm_args: Vec::new(),
811 cpu: "generic".to_string(),
812 features: String::new(),
813 dynamic_linking: false,
816 relocation_model: "pic".to_string(),
818 tls_model: "global-dynamic".to_string(),
819 disable_redzone: false,
820 eliminate_frame_pointer: true,
821 function_sections: true,
822 dll_prefix: "lib".to_string(),
823 dll_suffix: ".so".to_string(),
824 exe_suffix: String::new(),
825 staticlib_prefix: "lib".to_string(),
826 staticlib_suffix: ".a".to_string(),
828 abi_return_struct_as_int: false,
830 is_like_solaris: false,
831 is_like_windows: false,
832 is_like_android: false,
833 is_like_emscripten: false,
835 is_like_fuchsia: false,
836 linker_is_gnu: false,
837 allows_weak_linkage: true,
839 no_default_libraries: true,
840 position_independent_executables: false,
842 relro_level: RelroLevel::None,
843 pre_link_objects_exe: Vec::new(),
844 pre_link_objects_exe_crt: Vec::new(),
845 pre_link_objects_dll: Vec::new(),
846 post_link_objects: Vec::new(),
847 post_link_objects_crt: Vec::new(),
848 late_link_args: LinkArgs::new(),
849 link_env: Vec::new(),
850 link_env_remove: Vec::new(),
851 archive_format: "gnu".to_string(),
852 custom_unwind_resume: false,
853 main_needs_argc_argv: true,
856 obj_is_bitcode: false,
857 no_integrated_as: false,
858 min_atomic_width: None,
859 max_atomic_width: None,
861 panic_strategy: PanicStrategy::Unwind,
862 abi_blacklist: vec![],
863 crt_static_allows_dylibs: false,
864 crt_static_default: false,
865 crt_static_respected: false,
867 min_global_align: None,
868 default_codegen_units: None,
869 trap_unreachable: true,
873 codegen_backend: "llvm".to_string(),
874 default_hidden_visibility: false,
875 embed_bitcode: false,
876 emit_debug_gdb_scripts: true,
877 requires_uwtable: false,
878 simd_types_indirect: true,
879 limit_rdylib_exports: true,
880 override_export_symbols: None,
881 merge_functions: MergeFunctions::Aliases,
882 target_mcount: "mcount".to_string(),
888 /// Given a function ABI, turn it into the correct ABI for this target.
889 pub fn adjust_abi(&self, abi: Abi) -> Abi {
892 if self.options.is_like_windows && self.arch == "x86" {
898 // These ABI kinds are ignored on non-x86 Windows targets.
899 // See https://docs.microsoft.com/en-us/cpp/cpp/argument-passing-and-naming-conventions
900 // and the individual pages for __stdcall et al.
901 Abi::Stdcall | Abi::Fastcall | Abi::Vectorcall | Abi::Thiscall => {
902 if self.options.is_like_windows && self.arch != "x86" {
912 /// Minimum integer size in bits that this target can perform atomic
914 pub fn min_atomic_width(&self) -> u64 {
915 self.options.min_atomic_width.unwrap_or(8)
918 /// Maximum integer size in bits that this target can perform atomic
920 pub fn max_atomic_width(&self) -> u64 {
921 self.options.max_atomic_width.unwrap_or_else(|| self.target_pointer_width.parse().unwrap())
924 pub fn is_abi_supported(&self, abi: Abi) -> bool {
925 abi.generic() || !self.options.abi_blacklist.contains(&abi)
928 /// Loads a target descriptor from a JSON object.
929 pub fn from_json(obj: Json) -> TargetResult {
930 // While ugly, this code must remain this way to retain
931 // compatibility with existing JSON fields and the internal
932 // expected naming of the Target and TargetOptions structs.
933 // To ensure compatibility is retained, the built-in targets
934 // are round-tripped through this code to catch cases where
935 // the JSON parser is not updated to match the structs.
937 let get_req_field = |name: &str| {
939 .map(|s| s.as_string())
940 .and_then(|os| os.map(|s| s.to_string()))
941 .ok_or_else(|| format!("Field {} in target specification is required", name))
944 let get_opt_field = |name: &str, default: &str| {
945 obj.find(name).and_then(|s| s.as_string())
946 .map(|s| s.to_string())
947 .unwrap_or_else(|| default.to_string())
950 let mut base = Target {
951 llvm_target: get_req_field("llvm-target")?,
952 target_endian: get_req_field("target-endian")?,
953 target_pointer_width: get_req_field("target-pointer-width")?,
954 target_c_int_width: get_req_field("target-c-int-width")?,
955 data_layout: get_req_field("data-layout")?,
956 arch: get_req_field("arch")?,
957 target_os: get_req_field("os")?,
958 target_env: get_opt_field("env", ""),
959 target_vendor: get_opt_field("vendor", "unknown"),
960 linker_flavor: LinkerFlavor::from_str(&*get_req_field("linker-flavor")?)
962 format!("linker flavor must be {}", LinkerFlavor::one_of())
964 options: Default::default(),
968 ($key_name:ident) => ( {
969 let name = (stringify!($key_name)).replace("_", "-");
970 obj.find(&name[..]).map(|o| o.as_string()
971 .map(|s| base.options.$key_name = s.to_string()));
973 ($key_name:ident, bool) => ( {
974 let name = (stringify!($key_name)).replace("_", "-");
976 .map(|o| o.as_boolean()
977 .map(|s| base.options.$key_name = s));
979 ($key_name:ident, Option<u64>) => ( {
980 let name = (stringify!($key_name)).replace("_", "-");
983 .map(|s| base.options.$key_name = Some(s)));
985 ($key_name:ident, MergeFunctions) => ( {
986 let name = (stringify!($key_name)).replace("_", "-");
987 obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
988 match s.parse::<MergeFunctions>() {
989 Ok(mergefunc) => base.options.$key_name = mergefunc,
990 _ => return Some(Err(format!("'{}' is not a valid value for \
991 merge-functions. Use 'disabled', \
992 'trampolines', or 'aliases'.",
996 })).unwrap_or(Ok(()))
998 ($key_name:ident, PanicStrategy) => ( {
999 let name = (stringify!($key_name)).replace("_", "-");
1000 obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
1002 "unwind" => base.options.$key_name = PanicStrategy::Unwind,
1003 "abort" => base.options.$key_name = PanicStrategy::Abort,
1004 _ => return Some(Err(format!("'{}' is not a valid value for \
1005 panic-strategy. Use 'unwind' or 'abort'.",
1009 })).unwrap_or(Ok(()))
1011 ($key_name:ident, RelroLevel) => ( {
1012 let name = (stringify!($key_name)).replace("_", "-");
1013 obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
1014 match s.parse::<RelroLevel>() {
1015 Ok(level) => base.options.$key_name = level,
1016 _ => return Some(Err(format!("'{}' is not a valid value for \
1017 relro-level. Use 'full', 'partial, or 'off'.",
1021 })).unwrap_or(Ok(()))
1023 ($key_name:ident, list) => ( {
1024 let name = (stringify!($key_name)).replace("_", "-");
1025 obj.find(&name[..]).map(|o| o.as_array()
1026 .map(|v| base.options.$key_name = v.iter()
1027 .map(|a| a.as_string().unwrap().to_string()).collect()
1031 ($key_name:ident, opt_list) => ( {
1032 let name = (stringify!($key_name)).replace("_", "-");
1033 obj.find(&name[..]).map(|o| o.as_array()
1034 .map(|v| base.options.$key_name = Some(v.iter()
1035 .map(|a| a.as_string().unwrap().to_string()).collect())
1039 ($key_name:ident, optional) => ( {
1040 let name = (stringify!($key_name)).replace("_", "-");
1041 if let Some(o) = obj.find(&name[..]) {
1042 base.options.$key_name = o
1044 .map(|s| s.to_string() );
1047 ($key_name:ident, LldFlavor) => ( {
1048 let name = (stringify!($key_name)).replace("_", "-");
1049 obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
1050 if let Some(flavor) = LldFlavor::from_str(&s) {
1051 base.options.$key_name = flavor;
1053 return Some(Err(format!(
1054 "'{}' is not a valid value for lld-flavor. \
1055 Use 'darwin', 'gnu', 'link' or 'wasm.",
1059 })).unwrap_or(Ok(()))
1061 ($key_name:ident, LinkerFlavor) => ( {
1062 let name = (stringify!($key_name)).replace("_", "-");
1063 obj.find(&name[..]).and_then(|o| o.as_string().map(|s| {
1064 LinkerFlavor::from_str(&s).ok_or_else(|| {
1065 Err(format!("'{}' is not a valid value for linker-flavor. \
1066 Use 'em', 'gcc', 'ld' or 'msvc.", s))
1068 })).unwrap_or(Ok(()))
1070 ($key_name:ident, link_args) => ( {
1071 let name = (stringify!($key_name)).replace("_", "-");
1072 if let Some(val) = obj.find(&name[..]) {
1073 let obj = val.as_object().ok_or_else(|| format!("{}: expected a \
1074 JSON object with fields per linker-flavor.", name))?;
1075 let mut args = LinkArgs::new();
1077 let flavor = LinkerFlavor::from_str(&k).ok_or_else(|| {
1078 format!("{}: '{}' is not a valid value for linker-flavor. \
1079 Use 'em', 'gcc', 'ld' or 'msvc'", name, k)
1082 let v = v.as_array().ok_or_else(||
1083 format!("{}.{}: expected a JSON array", name, k)
1084 )?.iter().enumerate()
1086 let s = s.as_string().ok_or_else(||
1087 format!("{}.{}[{}]: expected a JSON string", name, k, i))?;
1090 .collect::<Result<Vec<_>, String>>()?;
1092 args.insert(flavor, v);
1094 base.options.$key_name = args;
1097 ($key_name:ident, env) => ( {
1098 let name = (stringify!($key_name)).replace("_", "-");
1099 if let Some(a) = obj.find(&name[..]).and_then(|o| o.as_array()) {
1101 if let Some(s) = o.as_string() {
1102 let p = s.split('=').collect::<Vec<_>>();
1104 let k = p[0].to_string();
1105 let v = p[1].to_string();
1106 base.options.$key_name.push((k, v));
1114 key!(is_builtin, bool);
1115 key!(linker, optional);
1116 key!(lld_flavor, LldFlavor)?;
1117 key!(pre_link_args, link_args);
1118 key!(pre_link_args_crt, link_args);
1119 key!(pre_link_objects_exe, list);
1120 key!(pre_link_objects_exe_crt, list);
1121 key!(pre_link_objects_dll, list);
1122 key!(late_link_args, link_args);
1123 key!(post_link_objects, list);
1124 key!(post_link_objects_crt, list);
1125 key!(post_link_args, link_args);
1126 key!(link_env, env);
1127 key!(link_env_remove, list);
1128 key!(asm_args, list);
1131 key!(dynamic_linking, bool);
1132 key!(only_cdylib, bool);
1133 key!(executables, bool);
1134 key!(relocation_model);
1135 key!(code_model, optional);
1137 key!(disable_redzone, bool);
1138 key!(eliminate_frame_pointer, bool);
1139 key!(function_sections, bool);
1143 key!(staticlib_prefix);
1144 key!(staticlib_suffix);
1145 key!(target_family, optional);
1146 key!(abi_return_struct_as_int, bool);
1147 key!(is_like_osx, bool);
1148 key!(is_like_solaris, bool);
1149 key!(is_like_windows, bool);
1150 key!(is_like_msvc, bool);
1151 key!(is_like_emscripten, bool);
1152 key!(is_like_android, bool);
1153 key!(is_like_fuchsia, bool);
1154 key!(linker_is_gnu, bool);
1155 key!(allows_weak_linkage, bool);
1156 key!(has_rpath, bool);
1157 key!(no_default_libraries, bool);
1158 key!(position_independent_executables, bool);
1159 key!(needs_plt, bool);
1160 key!(relro_level, RelroLevel)?;
1161 key!(archive_format);
1162 key!(allow_asm, bool);
1163 key!(custom_unwind_resume, bool);
1164 key!(main_needs_argc_argv, bool);
1165 key!(has_elf_tls, bool);
1166 key!(obj_is_bitcode, bool);
1167 key!(no_integrated_as, bool);
1168 key!(max_atomic_width, Option<u64>);
1169 key!(min_atomic_width, Option<u64>);
1170 key!(atomic_cas, bool);
1171 key!(panic_strategy, PanicStrategy)?;
1172 key!(crt_static_allows_dylibs, bool);
1173 key!(crt_static_default, bool);
1174 key!(crt_static_respected, bool);
1175 key!(stack_probes, bool);
1176 key!(min_global_align, Option<u64>);
1177 key!(default_codegen_units, Option<u64>);
1178 key!(trap_unreachable, bool);
1179 key!(requires_lto, bool);
1180 key!(singlethread, bool);
1181 key!(no_builtins, bool);
1182 key!(codegen_backend);
1183 key!(default_hidden_visibility, bool);
1184 key!(embed_bitcode, bool);
1185 key!(emit_debug_gdb_scripts, bool);
1186 key!(requires_uwtable, bool);
1187 key!(simd_types_indirect, bool);
1188 key!(limit_rdylib_exports, bool);
1189 key!(override_export_symbols, opt_list);
1190 key!(merge_functions, MergeFunctions)?;
1191 key!(target_mcount);
1193 if let Some(array) = obj.find("abi-blacklist").and_then(Json::as_array) {
1194 for name in array.iter().filter_map(|abi| abi.as_string()) {
1195 match lookup_abi(name) {
1198 return Err(format!("The ABI \"{}\" is considered to be supported on \
1199 all targets and cannot be blacklisted", abi))
1202 base.options.abi_blacklist.push(abi)
1204 None => return Err(format!("Unknown ABI \"{}\" in target specification", name))
1212 /// Search RUST_TARGET_PATH for a JSON file specifying the given target
1213 /// triple. Note that it could also just be a bare filename already, so also
1214 /// check for that. If one of the hardcoded targets we know about, just
1215 /// return it directly.
1217 /// The error string could come from any of the APIs called, including
1218 /// filesystem access and JSON decoding.
1219 pub fn search(target_triple: &TargetTriple) -> Result<Target, String> {
1222 use rustc_serialize::json;
1224 fn load_file(path: &Path) -> Result<Target, String> {
1225 let contents = fs::read(path).map_err(|e| e.to_string())?;
1226 let obj = json::from_reader(&mut &contents[..])
1227 .map_err(|e| e.to_string())?;
1228 Target::from_json(obj)
1231 match *target_triple {
1232 TargetTriple::TargetTriple(ref target_triple) => {
1233 // check if triple is in list of supported targets
1234 match load_specific(target_triple) {
1235 Ok(t) => return Ok(t),
1236 Err(LoadTargetError::BuiltinTargetNotFound(_)) => (),
1237 Err(LoadTargetError::Other(e)) => return Err(e),
1240 // search for a file named `target_triple`.json in RUST_TARGET_PATH
1242 let mut target = target_triple.to_string();
1243 target.push_str(".json");
1244 PathBuf::from(target)
1247 let target_path = env::var_os("RUST_TARGET_PATH").unwrap_or_default();
1249 // FIXME 16351: add a sane default search path?
1251 for dir in env::split_paths(&target_path) {
1252 let p = dir.join(&path);
1254 return load_file(&p);
1257 Err(format!("Could not find specification for target {:?}", target_triple))
1259 TargetTriple::TargetPath(ref target_path) => {
1260 if target_path.is_file() {
1261 return load_file(&target_path);
1263 Err(format!("Target path {:?} is not a valid file", target_path))
1269 impl ToJson for Target {
1270 fn to_json(&self) -> Json {
1271 let mut d = BTreeMap::new();
1272 let default: TargetOptions = Default::default();
1274 macro_rules! target_val {
1275 ($attr:ident) => ( {
1276 let name = (stringify!($attr)).replace("_", "-");
1277 d.insert(name, self.$attr.to_json());
1279 ($attr:ident, $key_name:expr) => ( {
1280 let name = $key_name;
1281 d.insert(name.to_string(), self.$attr.to_json());
1285 macro_rules! target_option_val {
1286 ($attr:ident) => ( {
1287 let name = (stringify!($attr)).replace("_", "-");
1288 if default.$attr != self.options.$attr {
1289 d.insert(name, self.options.$attr.to_json());
1292 ($attr:ident, $key_name:expr) => ( {
1293 let name = $key_name;
1294 if default.$attr != self.options.$attr {
1295 d.insert(name.to_string(), self.options.$attr.to_json());
1298 (link_args - $attr:ident) => ( {
1299 let name = (stringify!($attr)).replace("_", "-");
1300 if default.$attr != self.options.$attr {
1301 let obj = self.options.$attr
1303 .map(|(k, v)| (k.desc().to_owned(), v.clone()))
1304 .collect::<BTreeMap<_, _>>();
1305 d.insert(name, obj.to_json());
1308 (env - $attr:ident) => ( {
1309 let name = (stringify!($attr)).replace("_", "-");
1310 if default.$attr != self.options.$attr {
1311 let obj = self.options.$attr
1313 .map(|&(ref k, ref v)| k.clone() + "=" + &v)
1314 .collect::<Vec<_>>();
1315 d.insert(name, obj.to_json());
1321 target_val!(llvm_target);
1322 target_val!(target_endian);
1323 target_val!(target_pointer_width);
1324 target_val!(target_c_int_width);
1326 target_val!(target_os, "os");
1327 target_val!(target_env, "env");
1328 target_val!(target_vendor, "vendor");
1329 target_val!(data_layout);
1330 target_val!(linker_flavor);
1332 target_option_val!(is_builtin);
1333 target_option_val!(linker);
1334 target_option_val!(lld_flavor);
1335 target_option_val!(link_args - pre_link_args);
1336 target_option_val!(link_args - pre_link_args_crt);
1337 target_option_val!(pre_link_objects_exe);
1338 target_option_val!(pre_link_objects_exe_crt);
1339 target_option_val!(pre_link_objects_dll);
1340 target_option_val!(link_args - late_link_args);
1341 target_option_val!(post_link_objects);
1342 target_option_val!(post_link_objects_crt);
1343 target_option_val!(link_args - post_link_args);
1344 target_option_val!(env - link_env);
1345 target_option_val!(link_env_remove);
1346 target_option_val!(asm_args);
1347 target_option_val!(cpu);
1348 target_option_val!(features);
1349 target_option_val!(dynamic_linking);
1350 target_option_val!(only_cdylib);
1351 target_option_val!(executables);
1352 target_option_val!(relocation_model);
1353 target_option_val!(code_model);
1354 target_option_val!(tls_model);
1355 target_option_val!(disable_redzone);
1356 target_option_val!(eliminate_frame_pointer);
1357 target_option_val!(function_sections);
1358 target_option_val!(dll_prefix);
1359 target_option_val!(dll_suffix);
1360 target_option_val!(exe_suffix);
1361 target_option_val!(staticlib_prefix);
1362 target_option_val!(staticlib_suffix);
1363 target_option_val!(target_family);
1364 target_option_val!(abi_return_struct_as_int);
1365 target_option_val!(is_like_osx);
1366 target_option_val!(is_like_solaris);
1367 target_option_val!(is_like_windows);
1368 target_option_val!(is_like_msvc);
1369 target_option_val!(is_like_emscripten);
1370 target_option_val!(is_like_android);
1371 target_option_val!(is_like_fuchsia);
1372 target_option_val!(linker_is_gnu);
1373 target_option_val!(allows_weak_linkage);
1374 target_option_val!(has_rpath);
1375 target_option_val!(no_default_libraries);
1376 target_option_val!(position_independent_executables);
1377 target_option_val!(needs_plt);
1378 target_option_val!(relro_level);
1379 target_option_val!(archive_format);
1380 target_option_val!(allow_asm);
1381 target_option_val!(custom_unwind_resume);
1382 target_option_val!(main_needs_argc_argv);
1383 target_option_val!(has_elf_tls);
1384 target_option_val!(obj_is_bitcode);
1385 target_option_val!(no_integrated_as);
1386 target_option_val!(min_atomic_width);
1387 target_option_val!(max_atomic_width);
1388 target_option_val!(atomic_cas);
1389 target_option_val!(panic_strategy);
1390 target_option_val!(crt_static_allows_dylibs);
1391 target_option_val!(crt_static_default);
1392 target_option_val!(crt_static_respected);
1393 target_option_val!(stack_probes);
1394 target_option_val!(min_global_align);
1395 target_option_val!(default_codegen_units);
1396 target_option_val!(trap_unreachable);
1397 target_option_val!(requires_lto);
1398 target_option_val!(singlethread);
1399 target_option_val!(no_builtins);
1400 target_option_val!(codegen_backend);
1401 target_option_val!(default_hidden_visibility);
1402 target_option_val!(embed_bitcode);
1403 target_option_val!(emit_debug_gdb_scripts);
1404 target_option_val!(requires_uwtable);
1405 target_option_val!(simd_types_indirect);
1406 target_option_val!(limit_rdylib_exports);
1407 target_option_val!(override_export_symbols);
1408 target_option_val!(merge_functions);
1409 target_option_val!(target_mcount);
1411 if default.abi_blacklist != self.options.abi_blacklist {
1412 d.insert("abi-blacklist".to_string(), self.options.abi_blacklist.iter()
1413 .map(|&name| Abi::name(name).to_json())
1414 .collect::<Vec<_>>().to_json());
1421 /// Either a target triple string or a path to a JSON file.
1422 #[derive(PartialEq, Clone, Debug, Hash, RustcEncodable, RustcDecodable)]
1423 pub enum TargetTriple {
1424 TargetTriple(String),
1425 TargetPath(PathBuf),
1429 /// Creates a target triple from the passed target triple string.
1430 pub fn from_triple(triple: &str) -> Self {
1431 TargetTriple::TargetTriple(triple.to_string())
1434 /// Creates a target triple from the passed target path.
1435 pub fn from_path(path: &Path) -> Result<Self, io::Error> {
1436 let canonicalized_path = path.canonicalize()?;
1437 Ok(TargetTriple::TargetPath(canonicalized_path))
1440 /// Returns a string triple for this target.
1442 /// If this target is a path, the file name (without extension) is returned.
1443 pub fn triple(&self) -> &str {
1445 TargetTriple::TargetTriple(ref triple) => triple,
1446 TargetTriple::TargetPath(ref path) => {
1447 path.file_stem().expect("target path must not be empty").to_str()
1448 .expect("target path must be valid unicode")
1453 /// Returns an extended string triple for this target.
1455 /// If this target is a path, a hash of the path is appended to the triple returned
1457 pub fn debug_triple(&self) -> String {
1458 use std::hash::{Hash, Hasher};
1459 use std::collections::hash_map::DefaultHasher;
1461 let triple = self.triple();
1462 if let TargetTriple::TargetPath(ref path) = *self {
1463 let mut hasher = DefaultHasher::new();
1464 path.hash(&mut hasher);
1465 let hash = hasher.finish();
1466 format!("{}-{}", triple, hash)
1473 impl fmt::Display for TargetTriple {
1474 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
1475 write!(f, "{}", self.debug_triple())