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),
438 ("armebv7r-none-eabi", armebv7r_none_eabi),
439 ("armebv7r-none-eabihf", armebv7r_none_eabihf),
440 ("armv7r-none-eabi", armv7r_none_eabi),
441 ("armv7r-none-eabihf", armv7r_none_eabihf),
443 // `x86_64-pc-solaris` is an alias for `x86_64_sun_solaris` for backwards compatibility reasons.
444 // (See <https://github.com/rust-lang/rust/issues/40531>.)
445 ("x86_64-sun-solaris", "x86_64-pc-solaris", x86_64_sun_solaris),
446 ("sparcv9-sun-solaris", sparcv9_sun_solaris),
448 ("x86_64-pc-windows-gnu", x86_64_pc_windows_gnu),
449 ("i686-pc-windows-gnu", i686_pc_windows_gnu),
450 ("i686-uwp-windows-gnu", i686_uwp_windows_gnu),
451 ("x86_64-uwp-windows-gnu", x86_64_uwp_windows_gnu),
453 ("aarch64-pc-windows-msvc", aarch64_pc_windows_msvc),
454 ("aarch64-uwp-windows-msvc", aarch64_uwp_windows_msvc),
455 ("x86_64-pc-windows-msvc", x86_64_pc_windows_msvc),
456 ("x86_64-uwp-windows-msvc", x86_64_uwp_windows_msvc),
457 ("i686-pc-windows-msvc", i686_pc_windows_msvc),
458 ("i686-uwp-windows-msvc", i686_uwp_windows_msvc),
459 ("i586-pc-windows-msvc", i586_pc_windows_msvc),
460 ("thumbv7a-pc-windows-msvc", thumbv7a_pc_windows_msvc),
462 ("asmjs-unknown-emscripten", asmjs_unknown_emscripten),
463 ("wasm32-unknown-emscripten", wasm32_unknown_emscripten),
464 ("wasm32-unknown-unknown", wasm32_unknown_unknown),
465 ("wasm32-wasi", wasm32_wasi),
467 ("thumbv6m-none-eabi", thumbv6m_none_eabi),
468 ("thumbv7m-none-eabi", thumbv7m_none_eabi),
469 ("thumbv7em-none-eabi", thumbv7em_none_eabi),
470 ("thumbv7em-none-eabihf", thumbv7em_none_eabihf),
471 ("thumbv8m.base-none-eabi", thumbv8m_base_none_eabi),
472 ("thumbv8m.main-none-eabi", thumbv8m_main_none_eabi),
473 ("thumbv8m.main-none-eabihf", thumbv8m_main_none_eabihf),
475 ("armv7a-none-eabi", armv7a_none_eabi),
476 ("armv7a-none-eabihf", armv7a_none_eabihf),
478 ("msp430-none-elf", msp430_none_elf),
480 ("aarch64-unknown-cloudabi", aarch64_unknown_cloudabi),
481 ("armv7-unknown-cloudabi-eabihf", armv7_unknown_cloudabi_eabihf),
482 ("i686-unknown-cloudabi", i686_unknown_cloudabi),
483 ("x86_64-unknown-cloudabi", x86_64_unknown_cloudabi),
485 ("aarch64-unknown-hermit", aarch64_unknown_hermit),
486 ("x86_64-unknown-hermit", x86_64_unknown_hermit),
487 ("x86_64-unknown-hermit-kernel", x86_64_unknown_hermit_kernel),
489 ("riscv32i-unknown-none-elf", riscv32i_unknown_none_elf),
490 ("riscv32imc-unknown-none-elf", riscv32imc_unknown_none_elf),
491 ("riscv32imac-unknown-none-elf", riscv32imac_unknown_none_elf),
492 ("riscv64imac-unknown-none-elf", riscv64imac_unknown_none_elf),
493 ("riscv64gc-unknown-none-elf", riscv64gc_unknown_none_elf),
494 ("riscv64gc-unknown-linux-gnu", riscv64gc_unknown_linux_gnu),
496 ("aarch64-unknown-none", aarch64_unknown_none),
497 ("aarch64-unknown-none-softfloat", aarch64_unknown_none_softfloat),
499 ("x86_64-fortanix-unknown-sgx", x86_64_fortanix_unknown_sgx),
501 ("x86_64-unknown-uefi", x86_64_unknown_uefi),
502 ("i686-unknown-uefi", i686_unknown_uefi),
504 ("nvptx64-nvidia-cuda", nvptx64_nvidia_cuda),
506 ("i686-wrs-vxworks", i686_wrs_vxworks),
507 ("x86_64-wrs-vxworks", x86_64_wrs_vxworks),
508 ("armv7-wrs-vxworks-eabihf", armv7_wrs_vxworks_eabihf),
509 ("aarch64-wrs-vxworks", aarch64_wrs_vxworks),
510 ("powerpc-wrs-vxworks", powerpc_wrs_vxworks),
511 ("powerpc-wrs-vxworks-spe", powerpc_wrs_vxworks_spe),
512 ("powerpc64-wrs-vxworks", powerpc64_wrs_vxworks),
515 /// Everything `rustc` knows about how to compile for a specific target.
517 /// Every field here must be specified, and has no default value.
518 #[derive(PartialEq, Clone, Debug)]
520 /// Target triple to pass to LLVM.
521 pub llvm_target: String,
522 /// String to use as the `target_endian` `cfg` variable.
523 pub target_endian: String,
524 /// String to use as the `target_pointer_width` `cfg` variable.
525 pub target_pointer_width: String,
526 /// Width of c_int type
527 pub target_c_int_width: String,
528 /// OS name to use for conditional compilation.
529 pub target_os: String,
530 /// Environment name to use for conditional compilation.
531 pub target_env: String,
532 /// Vendor name to use for conditional compilation.
533 pub target_vendor: String,
534 /// Architecture to use for ABI considerations. Valid options include: "x86",
535 /// "x86_64", "arm", "aarch64", "mips", "powerpc", "powerpc64", and others.
537 /// [Data layout](http://llvm.org/docs/LangRef.html#data-layout) to pass to LLVM.
538 pub data_layout: String,
540 pub linker_flavor: LinkerFlavor,
541 /// Optional settings with defaults.
542 pub options: TargetOptions,
545 pub trait HasTargetSpec {
546 fn target_spec(&self) -> &Target;
549 impl HasTargetSpec for Target {
550 fn target_spec(&self) -> &Target {
555 /// Optional aspects of a target specification.
557 /// This has an implementation of `Default`, see each field for what the default is. In general,
558 /// these try to take "minimal defaults" that don't assume anything about the runtime they run in.
559 #[derive(PartialEq, Clone, Debug)]
560 pub struct TargetOptions {
561 /// Whether the target is built-in or loaded from a custom target specification.
562 pub is_builtin: bool,
565 pub linker: Option<String>,
568 pub lld_flavor: LldFlavor,
570 /// Linker arguments that are passed *before* any user-defined libraries.
571 pub pre_link_args: LinkArgs, // ... unconditionally
572 pub pre_link_args_crt: LinkArgs, // ... when linking with a bundled crt
573 /// Objects to link before all others, always found within the
575 pub pre_link_objects_exe: Vec<String>, // ... when linking an executable, unconditionally
576 pub pre_link_objects_exe_crt: Vec<String>, // ... when linking an executable with a bundled crt
577 pub pre_link_objects_dll: Vec<String>, // ... when linking a dylib
578 /// Linker arguments that are unconditionally passed after any
579 /// user-defined but before post_link_objects. Standard platform
580 /// libraries that should be always be linked to, usually go here.
581 pub late_link_args: LinkArgs,
582 /// Objects to link after all others, always found within the
584 pub post_link_objects: Vec<String>, // ... unconditionally
585 pub post_link_objects_crt: Vec<String>, // ... when linking with a bundled crt
586 /// Linker arguments that are unconditionally passed *after* any
587 /// user-defined libraries.
588 pub post_link_args: LinkArgs,
590 /// Environment variables to be set for the linker invocation.
591 pub link_env: Vec<(String, String)>,
592 /// Environment variables to be removed for the linker invocation.
593 pub link_env_remove: Vec<String>,
595 /// Extra arguments to pass to the external assembler (when used)
596 pub asm_args: Vec<String>,
598 /// Default CPU to pass to LLVM. Corresponds to `llc -mcpu=$cpu`. Defaults
601 /// Default target features to pass to LLVM. These features will *always* be
602 /// passed, and cannot be disabled even via `-C`. Corresponds to `llc
603 /// -mattr=$features`.
604 pub features: String,
605 /// Whether dynamic linking is available on this target. Defaults to false.
606 pub dynamic_linking: bool,
607 /// If dynamic linking is available, whether only cdylibs are supported.
608 pub only_cdylib: bool,
609 /// Whether executables are available on this target. iOS, for example, only allows static
610 /// libraries. Defaults to false.
611 pub executables: bool,
612 /// Relocation model to use in object file. Corresponds to `llc
613 /// -relocation-model=$relocation_model`. Defaults to "pic".
614 pub relocation_model: String,
615 /// Code model to use. Corresponds to `llc -code-model=$code_model`.
616 pub code_model: Option<String>,
617 /// TLS model to use. Options are "global-dynamic" (default), "local-dynamic", "initial-exec"
618 /// and "local-exec". This is similar to the -ftls-model option in GCC/Clang.
619 pub tls_model: String,
620 /// Do not emit code that uses the "red zone", if the ABI has one. Defaults to false.
621 pub disable_redzone: bool,
622 /// Eliminate frame pointers from stack frames if possible. Defaults to true.
623 pub eliminate_frame_pointer: bool,
624 /// Emit each function in its own section. Defaults to true.
625 pub function_sections: bool,
626 /// String to prepend to the name of every dynamic library. Defaults to "lib".
627 pub dll_prefix: String,
628 /// String to append to the name of every dynamic library. Defaults to ".so".
629 pub dll_suffix: String,
630 /// String to append to the name of every executable.
631 pub exe_suffix: String,
632 /// String to prepend to the name of every static library. Defaults to "lib".
633 pub staticlib_prefix: String,
634 /// String to append to the name of every static library. Defaults to ".a".
635 pub staticlib_suffix: String,
636 /// OS family to use for conditional compilation. Valid options: "unix", "windows".
637 pub target_family: Option<String>,
638 /// Whether the target toolchain's ABI supports returning small structs as an integer.
639 pub abi_return_struct_as_int: bool,
640 /// Whether the target toolchain is like macOS's. Only useful for compiling against iOS/macOS,
641 /// in particular running dsymutil and some other stuff like `-dead_strip`. Defaults to false.
642 pub is_like_osx: bool,
643 /// Whether the target toolchain is like Solaris's.
644 /// Only useful for compiling against Illumos/Solaris,
645 /// as they have a different set of linker flags. Defaults to false.
646 pub is_like_solaris: bool,
647 /// Whether the target toolchain is like Windows'. Only useful for compiling against Windows,
648 /// only really used for figuring out how to find libraries, since Windows uses its own
649 /// library naming convention. Defaults to false.
650 pub is_like_windows: bool,
651 pub is_like_msvc: bool,
652 /// Whether the target toolchain is like Android's. Only useful for compiling against Android.
653 /// Defaults to false.
654 pub is_like_android: bool,
655 /// Whether the target toolchain is like Emscripten's. Only useful for compiling with
656 /// Emscripten toolchain.
657 /// Defaults to false.
658 pub is_like_emscripten: bool,
659 /// Whether the target toolchain is like Fuchsia's.
660 pub is_like_fuchsia: bool,
661 /// Whether the linker support GNU-like arguments such as -O. Defaults to false.
662 pub linker_is_gnu: bool,
663 /// The MinGW toolchain has a known issue that prevents it from correctly
664 /// handling COFF object files with more than 2<sup>15</sup> sections. Since each weak
665 /// symbol needs its own COMDAT section, weak linkage implies a large
666 /// number sections that easily exceeds the given limit for larger
667 /// codebases. Consequently we want a way to disallow weak linkage on some
669 pub allows_weak_linkage: bool,
670 /// Whether the linker support rpaths or not. Defaults to false.
672 /// Whether to disable linking to the default libraries, typically corresponds
673 /// to `-nodefaultlibs`. Defaults to true.
674 pub no_default_libraries: bool,
675 /// Dynamically linked executables can be compiled as position independent
676 /// if the default relocation model of position independent code is not
677 /// changed. This is a requirement to take advantage of ASLR, as otherwise
678 /// the functions in the executable are not randomized and can be used
679 /// during an exploit of a vulnerability in any code.
680 pub position_independent_executables: bool,
681 /// Determines if the target always requires using the PLT for indirect
682 /// library calls or not. This controls the default value of the `-Z plt` flag.
684 /// Either partial, full, or off. Full RELRO makes the dynamic linker
685 /// resolve all symbols at startup and marks the GOT read-only before
686 /// starting the program, preventing overwriting the GOT.
687 pub relro_level: RelroLevel,
688 /// Format that archives should be emitted in. This affects whether we use
689 /// LLVM to assemble an archive or fall back to the system linker, and
690 /// currently only "gnu" is used to fall into LLVM. Unknown strings cause
691 /// the system linker to be used.
692 pub archive_format: String,
693 /// Is asm!() allowed? Defaults to true.
695 /// Whether the target uses a custom unwind resumption routine.
696 /// By default LLVM lowers `resume` instructions into calls to `_Unwind_Resume`
697 /// defined in libgcc. If this option is enabled, the target must provide
698 /// `eh_unwind_resume` lang item.
699 pub custom_unwind_resume: bool,
700 /// Whether the runtime startup code requires the `main` function be passed
701 /// `argc` and `argv` values.
702 pub main_needs_argc_argv: bool,
704 /// Flag indicating whether ELF TLS (e.g., #[thread_local]) is available for
706 pub has_elf_tls: bool,
707 // This is mainly for easy compatibility with emscripten.
708 // If we give emcc .o files that are actually .bc files it
710 pub obj_is_bitcode: bool,
712 // LLVM can't produce object files for this target. Instead, we'll make LLVM
713 // emit assembly and then use `gcc` to turn that assembly into an object
715 pub no_integrated_as: bool,
717 /// Don't use this field; instead use the `.min_atomic_width()` method.
718 pub min_atomic_width: Option<u64>,
720 /// Don't use this field; instead use the `.max_atomic_width()` method.
721 pub max_atomic_width: Option<u64>,
723 /// Whether the target supports atomic CAS operations natively
724 pub atomic_cas: bool,
726 /// Panic strategy: "unwind" or "abort"
727 pub panic_strategy: PanicStrategy,
729 /// A blacklist of ABIs unsupported by the current target. Note that generic
730 /// ABIs are considered to be supported on all platforms and cannot be blacklisted.
731 pub abi_blacklist: Vec<Abi>,
733 /// Whether or not linking dylibs to a static CRT is allowed.
734 pub crt_static_allows_dylibs: bool,
735 /// Whether or not the CRT is statically linked by default.
736 pub crt_static_default: bool,
737 /// Whether or not crt-static is respected by the compiler (or is a no-op).
738 pub crt_static_respected: bool,
740 /// Whether or not stack probes (__rust_probestack) are enabled
741 pub stack_probes: bool,
743 /// The minimum alignment for global symbols.
744 pub min_global_align: Option<u64>,
746 /// Default number of codegen units to use in debug mode
747 pub default_codegen_units: Option<u64>,
749 /// Whether to generate trap instructions in places where optimization would
750 /// otherwise produce control flow that falls through into unrelated memory.
751 pub trap_unreachable: bool,
753 /// This target requires everything to be compiled with LTO to emit a final
754 /// executable, aka there is no native linker for this target.
755 pub requires_lto: bool,
757 /// This target has no support for threads.
758 pub singlethread: bool,
760 /// Whether library functions call lowering/optimization is disabled in LLVM
761 /// for this target unconditionally.
762 pub no_builtins: bool,
764 /// The codegen backend to use for this target, typically "llvm"
765 pub codegen_backend: String,
767 /// The default visibility for symbols in this target should be "hidden"
768 /// rather than "default"
769 pub default_hidden_visibility: bool,
771 /// Whether or not bitcode is embedded in object files
772 pub embed_bitcode: bool,
774 /// Whether a .debug_gdb_scripts section will be added to the output object file
775 pub emit_debug_gdb_scripts: bool,
777 /// Whether or not to unconditionally `uwtable` attributes on functions,
778 /// typically because the platform needs to unwind for things like stack
780 pub requires_uwtable: bool,
782 /// Whether or not SIMD types are passed by reference in the Rust ABI,
783 /// typically required if a target can be compiled with a mixed set of
784 /// target features. This is `true` by default, and `false` for targets like
785 /// wasm32 where the whole program either has simd or not.
786 pub simd_types_indirect: bool,
788 /// Pass a list of symbol which should be exported in the dylib to the linker.
789 pub limit_rdylib_exports: bool,
791 /// If set, have the linker export exactly these symbols, instead of using
792 /// the usual logic to figure this out from the crate itself.
793 pub override_export_symbols: Option<Vec<String>>,
795 /// Determines how or whether the MergeFunctions LLVM pass should run for
796 /// this target. Either "disabled", "trampolines", or "aliases".
797 /// The MergeFunctions pass is generally useful, but some targets may need
798 /// to opt out. The default is "aliases".
800 /// Workaround for: https://github.com/rust-lang/rust/issues/57356
801 pub merge_functions: MergeFunctions,
803 /// Use platform dependent mcount function
804 pub target_mcount: String,
806 /// LLVM ABI name, corresponds to the '-mabi' parameter available in multilib C compilers
807 pub llvm_abiname: String,
809 /// Whether or not RelaxElfRelocation flag will be passed to the linker
810 pub relax_elf_relocations: bool,
812 /// Additional arguments to pass to LLVM, similar to the `-C llvm-args` codegen option.
813 pub llvm_args: Vec<String>,
816 impl Default for TargetOptions {
817 /// Creates a set of "sane defaults" for any target. This is still
818 /// incomplete, and if used for compilation, will certainly not work.
819 fn default() -> TargetOptions {
822 linker: option_env!("CFG_DEFAULT_LINKER").map(|s| s.to_string()),
823 lld_flavor: LldFlavor::Ld,
824 pre_link_args: LinkArgs::new(),
825 pre_link_args_crt: LinkArgs::new(),
826 post_link_args: LinkArgs::new(),
827 asm_args: Vec::new(),
828 cpu: "generic".to_string(),
829 features: String::new(),
830 dynamic_linking: false,
833 relocation_model: "pic".to_string(),
835 tls_model: "global-dynamic".to_string(),
836 disable_redzone: false,
837 eliminate_frame_pointer: true,
838 function_sections: true,
839 dll_prefix: "lib".to_string(),
840 dll_suffix: ".so".to_string(),
841 exe_suffix: String::new(),
842 staticlib_prefix: "lib".to_string(),
843 staticlib_suffix: ".a".to_string(),
845 abi_return_struct_as_int: false,
847 is_like_solaris: false,
848 is_like_windows: false,
849 is_like_android: false,
850 is_like_emscripten: false,
852 is_like_fuchsia: false,
853 linker_is_gnu: false,
854 allows_weak_linkage: true,
856 no_default_libraries: true,
857 position_independent_executables: false,
859 relro_level: RelroLevel::None,
860 pre_link_objects_exe: Vec::new(),
861 pre_link_objects_exe_crt: Vec::new(),
862 pre_link_objects_dll: Vec::new(),
863 post_link_objects: Vec::new(),
864 post_link_objects_crt: Vec::new(),
865 late_link_args: LinkArgs::new(),
866 link_env: Vec::new(),
867 link_env_remove: Vec::new(),
868 archive_format: "gnu".to_string(),
869 custom_unwind_resume: false,
870 main_needs_argc_argv: true,
873 obj_is_bitcode: false,
874 no_integrated_as: false,
875 min_atomic_width: None,
876 max_atomic_width: None,
878 panic_strategy: PanicStrategy::Unwind,
879 abi_blacklist: vec![],
880 crt_static_allows_dylibs: false,
881 crt_static_default: false,
882 crt_static_respected: false,
884 min_global_align: None,
885 default_codegen_units: None,
886 trap_unreachable: true,
890 codegen_backend: "llvm".to_string(),
891 default_hidden_visibility: false,
892 embed_bitcode: false,
893 emit_debug_gdb_scripts: true,
894 requires_uwtable: false,
895 simd_types_indirect: true,
896 limit_rdylib_exports: true,
897 override_export_symbols: None,
898 merge_functions: MergeFunctions::Aliases,
899 target_mcount: "mcount".to_string(),
900 llvm_abiname: "".to_string(),
901 relax_elf_relocations: false,
908 /// Given a function ABI, turn it into the correct ABI for this target.
909 pub fn adjust_abi(&self, abi: Abi) -> Abi {
912 if self.options.is_like_windows && self.arch == "x86" {
918 // These ABI kinds are ignored on non-x86 Windows targets.
919 // See https://docs.microsoft.com/en-us/cpp/cpp/argument-passing-and-naming-conventions
920 // and the individual pages for __stdcall et al.
921 Abi::Stdcall | Abi::Fastcall | Abi::Vectorcall | Abi::Thiscall => {
922 if self.options.is_like_windows && self.arch != "x86" { Abi::C } else { abi }
925 if self.arch == "x86_64" {
935 /// Minimum integer size in bits that this target can perform atomic
937 pub fn min_atomic_width(&self) -> u64 {
938 self.options.min_atomic_width.unwrap_or(8)
941 /// Maximum integer size in bits that this target can perform atomic
943 pub fn max_atomic_width(&self) -> u64 {
944 self.options.max_atomic_width.unwrap_or_else(|| self.target_pointer_width.parse().unwrap())
947 pub fn is_abi_supported(&self, abi: Abi) -> bool {
948 abi.generic() || !self.options.abi_blacklist.contains(&abi)
951 /// Loads a target descriptor from a JSON object.
952 pub fn from_json(obj: Json) -> TargetResult {
953 // While ugly, this code must remain this way to retain
954 // compatibility with existing JSON fields and the internal
955 // expected naming of the Target and TargetOptions structs.
956 // To ensure compatibility is retained, the built-in targets
957 // are round-tripped through this code to catch cases where
958 // the JSON parser is not updated to match the structs.
960 let get_req_field = |name: &str| {
962 .map(|s| s.as_string())
963 .and_then(|os| os.map(|s| s.to_string()))
964 .ok_or_else(|| format!("Field {} in target specification is required", name))
967 let get_opt_field = |name: &str, default: &str| {
969 .and_then(|s| s.as_string())
970 .map(|s| s.to_string())
971 .unwrap_or_else(|| default.to_string())
974 let mut base = Target {
975 llvm_target: get_req_field("llvm-target")?,
976 target_endian: get_req_field("target-endian")?,
977 target_pointer_width: get_req_field("target-pointer-width")?,
978 target_c_int_width: get_req_field("target-c-int-width")?,
979 data_layout: get_req_field("data-layout")?,
980 arch: get_req_field("arch")?,
981 target_os: get_req_field("os")?,
982 target_env: get_opt_field("env", ""),
983 target_vendor: get_opt_field("vendor", "unknown"),
984 linker_flavor: LinkerFlavor::from_str(&*get_req_field("linker-flavor")?)
985 .ok_or_else(|| format!("linker flavor must be {}", LinkerFlavor::one_of()))?,
986 options: Default::default(),
990 ($key_name:ident) => ( {
991 let name = (stringify!($key_name)).replace("_", "-");
992 obj.find(&name[..]).map(|o| o.as_string()
993 .map(|s| base.options.$key_name = s.to_string()));
995 ($key_name:ident, bool) => ( {
996 let name = (stringify!($key_name)).replace("_", "-");
998 .map(|o| o.as_boolean()
999 .map(|s| base.options.$key_name = s));
1001 ($key_name:ident, Option<u64>) => ( {
1002 let name = (stringify!($key_name)).replace("_", "-");
1005 .map(|s| base.options.$key_name = Some(s)));
1007 ($key_name:ident, MergeFunctions) => ( {
1008 let name = (stringify!($key_name)).replace("_", "-");
1009 obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
1010 match s.parse::<MergeFunctions>() {
1011 Ok(mergefunc) => base.options.$key_name = mergefunc,
1012 _ => return Some(Err(format!("'{}' is not a valid value for \
1013 merge-functions. Use 'disabled', \
1014 'trampolines', or 'aliases'.",
1018 })).unwrap_or(Ok(()))
1020 ($key_name:ident, PanicStrategy) => ( {
1021 let name = (stringify!($key_name)).replace("_", "-");
1022 obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
1024 "unwind" => base.options.$key_name = PanicStrategy::Unwind,
1025 "abort" => base.options.$key_name = PanicStrategy::Abort,
1026 _ => return Some(Err(format!("'{}' is not a valid value for \
1027 panic-strategy. Use 'unwind' or 'abort'.",
1031 })).unwrap_or(Ok(()))
1033 ($key_name:ident, RelroLevel) => ( {
1034 let name = (stringify!($key_name)).replace("_", "-");
1035 obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
1036 match s.parse::<RelroLevel>() {
1037 Ok(level) => base.options.$key_name = level,
1038 _ => return Some(Err(format!("'{}' is not a valid value for \
1039 relro-level. Use 'full', 'partial, or 'off'.",
1043 })).unwrap_or(Ok(()))
1045 ($key_name:ident, list) => ( {
1046 let name = (stringify!($key_name)).replace("_", "-");
1047 obj.find(&name[..]).map(|o| o.as_array()
1048 .map(|v| base.options.$key_name = v.iter()
1049 .map(|a| a.as_string().unwrap().to_string()).collect()
1053 ($key_name:ident, opt_list) => ( {
1054 let name = (stringify!($key_name)).replace("_", "-");
1055 obj.find(&name[..]).map(|o| o.as_array()
1056 .map(|v| base.options.$key_name = Some(v.iter()
1057 .map(|a| a.as_string().unwrap().to_string()).collect())
1061 ($key_name:ident, optional) => ( {
1062 let name = (stringify!($key_name)).replace("_", "-");
1063 if let Some(o) = obj.find(&name[..]) {
1064 base.options.$key_name = o
1066 .map(|s| s.to_string() );
1069 ($key_name:ident, LldFlavor) => ( {
1070 let name = (stringify!($key_name)).replace("_", "-");
1071 obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
1072 if let Some(flavor) = LldFlavor::from_str(&s) {
1073 base.options.$key_name = flavor;
1075 return Some(Err(format!(
1076 "'{}' is not a valid value for lld-flavor. \
1077 Use 'darwin', 'gnu', 'link' or 'wasm.",
1081 })).unwrap_or(Ok(()))
1083 ($key_name:ident, LinkerFlavor) => ( {
1084 let name = (stringify!($key_name)).replace("_", "-");
1085 obj.find(&name[..]).and_then(|o| o.as_string().map(|s| {
1086 LinkerFlavor::from_str(&s).ok_or_else(|| {
1087 Err(format!("'{}' is not a valid value for linker-flavor. \
1088 Use 'em', 'gcc', 'ld' or 'msvc.", s))
1090 })).unwrap_or(Ok(()))
1092 ($key_name:ident, link_args) => ( {
1093 let name = (stringify!($key_name)).replace("_", "-");
1094 if let Some(val) = obj.find(&name[..]) {
1095 let obj = val.as_object().ok_or_else(|| format!("{}: expected a \
1096 JSON object with fields per linker-flavor.", name))?;
1097 let mut args = LinkArgs::new();
1099 let flavor = LinkerFlavor::from_str(&k).ok_or_else(|| {
1100 format!("{}: '{}' is not a valid value for linker-flavor. \
1101 Use 'em', 'gcc', 'ld' or 'msvc'", name, k)
1104 let v = v.as_array().ok_or_else(||
1105 format!("{}.{}: expected a JSON array", name, k)
1106 )?.iter().enumerate()
1108 let s = s.as_string().ok_or_else(||
1109 format!("{}.{}[{}]: expected a JSON string", name, k, i))?;
1112 .collect::<Result<Vec<_>, String>>()?;
1114 args.insert(flavor, v);
1116 base.options.$key_name = args;
1119 ($key_name:ident, env) => ( {
1120 let name = (stringify!($key_name)).replace("_", "-");
1121 if let Some(a) = obj.find(&name[..]).and_then(|o| o.as_array()) {
1123 if let Some(s) = o.as_string() {
1124 let p = s.split('=').collect::<Vec<_>>();
1126 let k = p[0].to_string();
1127 let v = p[1].to_string();
1128 base.options.$key_name.push((k, v));
1136 key!(is_builtin, bool);
1137 key!(linker, optional);
1138 key!(lld_flavor, LldFlavor)?;
1139 key!(pre_link_args, link_args);
1140 key!(pre_link_args_crt, link_args);
1141 key!(pre_link_objects_exe, list);
1142 key!(pre_link_objects_exe_crt, list);
1143 key!(pre_link_objects_dll, list);
1144 key!(late_link_args, link_args);
1145 key!(post_link_objects, list);
1146 key!(post_link_objects_crt, list);
1147 key!(post_link_args, link_args);
1148 key!(link_env, env);
1149 key!(link_env_remove, list);
1150 key!(asm_args, list);
1153 key!(dynamic_linking, bool);
1154 key!(only_cdylib, bool);
1155 key!(executables, bool);
1156 key!(relocation_model);
1157 key!(code_model, optional);
1159 key!(disable_redzone, bool);
1160 key!(eliminate_frame_pointer, bool);
1161 key!(function_sections, bool);
1165 key!(staticlib_prefix);
1166 key!(staticlib_suffix);
1167 key!(target_family, optional);
1168 key!(abi_return_struct_as_int, bool);
1169 key!(is_like_osx, bool);
1170 key!(is_like_solaris, bool);
1171 key!(is_like_windows, bool);
1172 key!(is_like_msvc, bool);
1173 key!(is_like_emscripten, bool);
1174 key!(is_like_android, bool);
1175 key!(is_like_fuchsia, bool);
1176 key!(linker_is_gnu, bool);
1177 key!(allows_weak_linkage, bool);
1178 key!(has_rpath, bool);
1179 key!(no_default_libraries, bool);
1180 key!(position_independent_executables, bool);
1181 key!(needs_plt, bool);
1182 key!(relro_level, RelroLevel)?;
1183 key!(archive_format);
1184 key!(allow_asm, bool);
1185 key!(custom_unwind_resume, bool);
1186 key!(main_needs_argc_argv, bool);
1187 key!(has_elf_tls, bool);
1188 key!(obj_is_bitcode, bool);
1189 key!(no_integrated_as, bool);
1190 key!(max_atomic_width, Option<u64>);
1191 key!(min_atomic_width, Option<u64>);
1192 key!(atomic_cas, bool);
1193 key!(panic_strategy, PanicStrategy)?;
1194 key!(crt_static_allows_dylibs, bool);
1195 key!(crt_static_default, bool);
1196 key!(crt_static_respected, bool);
1197 key!(stack_probes, bool);
1198 key!(min_global_align, Option<u64>);
1199 key!(default_codegen_units, Option<u64>);
1200 key!(trap_unreachable, bool);
1201 key!(requires_lto, bool);
1202 key!(singlethread, bool);
1203 key!(no_builtins, bool);
1204 key!(codegen_backend);
1205 key!(default_hidden_visibility, bool);
1206 key!(embed_bitcode, bool);
1207 key!(emit_debug_gdb_scripts, bool);
1208 key!(requires_uwtable, bool);
1209 key!(simd_types_indirect, bool);
1210 key!(limit_rdylib_exports, bool);
1211 key!(override_export_symbols, opt_list);
1212 key!(merge_functions, MergeFunctions)?;
1213 key!(target_mcount);
1215 key!(relax_elf_relocations, bool);
1216 key!(llvm_args, list);
1218 if let Some(array) = obj.find("abi-blacklist").and_then(Json::as_array) {
1219 for name in array.iter().filter_map(|abi| abi.as_string()) {
1220 match lookup_abi(name) {
1224 "The ABI \"{}\" is considered to be supported on \
1225 all targets and cannot be blacklisted",
1230 base.options.abi_blacklist.push(abi)
1233 return Err(format!("Unknown ABI \"{}\" in target specification", name));
1242 /// Search RUST_TARGET_PATH for a JSON file specifying the given target
1243 /// triple. Note that it could also just be a bare filename already, so also
1244 /// check for that. If one of the hardcoded targets we know about, just
1245 /// return it directly.
1247 /// The error string could come from any of the APIs called, including
1248 /// filesystem access and JSON decoding.
1249 pub fn search(target_triple: &TargetTriple) -> Result<Target, String> {
1250 use rustc_serialize::json;
1254 fn load_file(path: &Path) -> Result<Target, String> {
1255 let contents = fs::read(path).map_err(|e| e.to_string())?;
1256 let obj = json::from_reader(&mut &contents[..]).map_err(|e| e.to_string())?;
1257 Target::from_json(obj)
1260 match *target_triple {
1261 TargetTriple::TargetTriple(ref target_triple) => {
1262 // check if triple is in list of supported targets
1263 match load_specific(target_triple) {
1264 Ok(t) => return Ok(t),
1265 Err(LoadTargetError::BuiltinTargetNotFound(_)) => (),
1266 Err(LoadTargetError::Other(e)) => return Err(e),
1269 // search for a file named `target_triple`.json in RUST_TARGET_PATH
1271 let mut target = target_triple.to_string();
1272 target.push_str(".json");
1273 PathBuf::from(target)
1276 let target_path = env::var_os("RUST_TARGET_PATH").unwrap_or_default();
1278 // FIXME 16351: add a sane default search path?
1280 for dir in env::split_paths(&target_path) {
1281 let p = dir.join(&path);
1283 return load_file(&p);
1286 Err(format!("Could not find specification for target {:?}", target_triple))
1288 TargetTriple::TargetPath(ref target_path) => {
1289 if target_path.is_file() {
1290 return load_file(&target_path);
1292 Err(format!("Target path {:?} is not a valid file", target_path))
1298 impl ToJson for Target {
1299 fn to_json(&self) -> Json {
1300 let mut d = BTreeMap::new();
1301 let default: TargetOptions = Default::default();
1303 macro_rules! target_val {
1305 let name = (stringify!($attr)).replace("_", "-");
1306 d.insert(name, self.$attr.to_json());
1308 ($attr:ident, $key_name:expr) => {{
1309 let name = $key_name;
1310 d.insert(name.to_string(), self.$attr.to_json());
1314 macro_rules! target_option_val {
1316 let name = (stringify!($attr)).replace("_", "-");
1317 if default.$attr != self.options.$attr {
1318 d.insert(name, self.options.$attr.to_json());
1321 ($attr:ident, $key_name:expr) => {{
1322 let name = $key_name;
1323 if default.$attr != self.options.$attr {
1324 d.insert(name.to_string(), self.options.$attr.to_json());
1327 (link_args - $attr:ident) => {{
1328 let name = (stringify!($attr)).replace("_", "-");
1329 if default.$attr != self.options.$attr {
1334 .map(|(k, v)| (k.desc().to_owned(), v.clone()))
1335 .collect::<BTreeMap<_, _>>();
1336 d.insert(name, obj.to_json());
1339 (env - $attr:ident) => {{
1340 let name = (stringify!($attr)).replace("_", "-");
1341 if default.$attr != self.options.$attr {
1346 .map(|&(ref k, ref v)| k.clone() + "=" + &v)
1347 .collect::<Vec<_>>();
1348 d.insert(name, obj.to_json());
1353 target_val!(llvm_target);
1354 target_val!(target_endian);
1355 target_val!(target_pointer_width);
1356 target_val!(target_c_int_width);
1358 target_val!(target_os, "os");
1359 target_val!(target_env, "env");
1360 target_val!(target_vendor, "vendor");
1361 target_val!(data_layout);
1362 target_val!(linker_flavor);
1364 target_option_val!(is_builtin);
1365 target_option_val!(linker);
1366 target_option_val!(lld_flavor);
1367 target_option_val!(link_args - pre_link_args);
1368 target_option_val!(link_args - pre_link_args_crt);
1369 target_option_val!(pre_link_objects_exe);
1370 target_option_val!(pre_link_objects_exe_crt);
1371 target_option_val!(pre_link_objects_dll);
1372 target_option_val!(link_args - late_link_args);
1373 target_option_val!(post_link_objects);
1374 target_option_val!(post_link_objects_crt);
1375 target_option_val!(link_args - post_link_args);
1376 target_option_val!(env - link_env);
1377 target_option_val!(link_env_remove);
1378 target_option_val!(asm_args);
1379 target_option_val!(cpu);
1380 target_option_val!(features);
1381 target_option_val!(dynamic_linking);
1382 target_option_val!(only_cdylib);
1383 target_option_val!(executables);
1384 target_option_val!(relocation_model);
1385 target_option_val!(code_model);
1386 target_option_val!(tls_model);
1387 target_option_val!(disable_redzone);
1388 target_option_val!(eliminate_frame_pointer);
1389 target_option_val!(function_sections);
1390 target_option_val!(dll_prefix);
1391 target_option_val!(dll_suffix);
1392 target_option_val!(exe_suffix);
1393 target_option_val!(staticlib_prefix);
1394 target_option_val!(staticlib_suffix);
1395 target_option_val!(target_family);
1396 target_option_val!(abi_return_struct_as_int);
1397 target_option_val!(is_like_osx);
1398 target_option_val!(is_like_solaris);
1399 target_option_val!(is_like_windows);
1400 target_option_val!(is_like_msvc);
1401 target_option_val!(is_like_emscripten);
1402 target_option_val!(is_like_android);
1403 target_option_val!(is_like_fuchsia);
1404 target_option_val!(linker_is_gnu);
1405 target_option_val!(allows_weak_linkage);
1406 target_option_val!(has_rpath);
1407 target_option_val!(no_default_libraries);
1408 target_option_val!(position_independent_executables);
1409 target_option_val!(needs_plt);
1410 target_option_val!(relro_level);
1411 target_option_val!(archive_format);
1412 target_option_val!(allow_asm);
1413 target_option_val!(custom_unwind_resume);
1414 target_option_val!(main_needs_argc_argv);
1415 target_option_val!(has_elf_tls);
1416 target_option_val!(obj_is_bitcode);
1417 target_option_val!(no_integrated_as);
1418 target_option_val!(min_atomic_width);
1419 target_option_val!(max_atomic_width);
1420 target_option_val!(atomic_cas);
1421 target_option_val!(panic_strategy);
1422 target_option_val!(crt_static_allows_dylibs);
1423 target_option_val!(crt_static_default);
1424 target_option_val!(crt_static_respected);
1425 target_option_val!(stack_probes);
1426 target_option_val!(min_global_align);
1427 target_option_val!(default_codegen_units);
1428 target_option_val!(trap_unreachable);
1429 target_option_val!(requires_lto);
1430 target_option_val!(singlethread);
1431 target_option_val!(no_builtins);
1432 target_option_val!(codegen_backend);
1433 target_option_val!(default_hidden_visibility);
1434 target_option_val!(embed_bitcode);
1435 target_option_val!(emit_debug_gdb_scripts);
1436 target_option_val!(requires_uwtable);
1437 target_option_val!(simd_types_indirect);
1438 target_option_val!(limit_rdylib_exports);
1439 target_option_val!(override_export_symbols);
1440 target_option_val!(merge_functions);
1441 target_option_val!(target_mcount);
1442 target_option_val!(llvm_abiname);
1443 target_option_val!(relax_elf_relocations);
1444 target_option_val!(llvm_args);
1446 if default.abi_blacklist != self.options.abi_blacklist {
1448 "abi-blacklist".to_string(),
1452 .map(|&name| Abi::name(name).to_json())
1453 .collect::<Vec<_>>()
1462 /// Either a target triple string or a path to a JSON file.
1463 #[derive(PartialEq, Clone, Debug, Hash, RustcEncodable, RustcDecodable)]
1464 pub enum TargetTriple {
1465 TargetTriple(String),
1466 TargetPath(PathBuf),
1470 /// Creates a target triple from the passed target triple string.
1471 pub fn from_triple(triple: &str) -> Self {
1472 TargetTriple::TargetTriple(triple.to_string())
1475 /// Creates a target triple from the passed target path.
1476 pub fn from_path(path: &Path) -> Result<Self, io::Error> {
1477 let canonicalized_path = path.canonicalize()?;
1478 Ok(TargetTriple::TargetPath(canonicalized_path))
1481 /// Returns a string triple for this target.
1483 /// If this target is a path, the file name (without extension) is returned.
1484 pub fn triple(&self) -> &str {
1486 TargetTriple::TargetTriple(ref triple) => triple,
1487 TargetTriple::TargetPath(ref path) => path
1489 .expect("target path must not be empty")
1491 .expect("target path must be valid unicode"),
1495 /// Returns an extended string triple for this target.
1497 /// If this target is a path, a hash of the path is appended to the triple returned
1499 pub fn debug_triple(&self) -> String {
1500 use std::collections::hash_map::DefaultHasher;
1501 use std::hash::{Hash, Hasher};
1503 let triple = self.triple();
1504 if let TargetTriple::TargetPath(ref path) = *self {
1505 let mut hasher = DefaultHasher::new();
1506 path.hash(&mut hasher);
1507 let hash = hasher.finish();
1508 format!("{}-{}", triple, hash)
1515 impl fmt::Display for TargetTriple {
1516 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
1517 write!(f, "{}", self.debug_triple())