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::path::{Path, PathBuf};
41 use std::str::FromStr;
44 use rustc_macros::HashStable_Generic;
57 mod hermit_kernel_base;
60 mod linux_kernel_base;
73 mod windows_msvc_base;
74 mod windows_uwp_gnu_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 = $module::target()
287 .map_err(LoadTargetError::Other)?;
288 t.options.is_builtin = true;
290 // round-trip through the JSON parser to ensure at
291 // run-time that the parser works correctly
292 t = Target::from_json(t.to_json())
293 .map_err(LoadTargetError::Other)?;
294 debug!("got builtin target: {:?}", t);
298 _ => Err(LoadTargetError::BuiltinTargetNotFound(
299 format!("Unable to find target: {}", target)))
303 pub fn get_targets() -> impl Iterator<Item = String> {
304 TARGETS.iter().filter_map(|t| -> Option<String> {
306 .and(Ok(t.to_string()))
315 // Cannot put this into a separate file without duplication, make an exception.
319 tests_impl::test_target(super::$module::target());
327 ("x86_64-unknown-linux-gnu", x86_64_unknown_linux_gnu),
328 ("x86_64-unknown-linux-gnux32", x86_64_unknown_linux_gnux32),
329 ("i686-unknown-linux-gnu", i686_unknown_linux_gnu),
330 ("i586-unknown-linux-gnu", i586_unknown_linux_gnu),
331 ("mips-unknown-linux-gnu", mips_unknown_linux_gnu),
332 ("mips64-unknown-linux-gnuabi64", mips64_unknown_linux_gnuabi64),
333 ("mips64el-unknown-linux-gnuabi64", mips64el_unknown_linux_gnuabi64),
334 ("mipsisa32r6-unknown-linux-gnu", mipsisa32r6_unknown_linux_gnu),
335 ("mipsisa32r6el-unknown-linux-gnu", mipsisa32r6el_unknown_linux_gnu),
336 ("mipsisa64r6-unknown-linux-gnuabi64", mipsisa64r6_unknown_linux_gnuabi64),
337 ("mipsisa64r6el-unknown-linux-gnuabi64", mipsisa64r6el_unknown_linux_gnuabi64),
338 ("mipsel-unknown-linux-gnu", mipsel_unknown_linux_gnu),
339 ("powerpc-unknown-linux-gnu", powerpc_unknown_linux_gnu),
340 ("powerpc-unknown-linux-gnuspe", powerpc_unknown_linux_gnuspe),
341 ("powerpc-unknown-linux-musl", powerpc_unknown_linux_musl),
342 ("powerpc64-unknown-linux-gnu", powerpc64_unknown_linux_gnu),
343 ("powerpc64-unknown-linux-musl", powerpc64_unknown_linux_musl),
344 ("powerpc64le-unknown-linux-gnu", powerpc64le_unknown_linux_gnu),
345 ("powerpc64le-unknown-linux-musl", powerpc64le_unknown_linux_musl),
346 ("s390x-unknown-linux-gnu", s390x_unknown_linux_gnu),
347 ("sparc-unknown-linux-gnu", sparc_unknown_linux_gnu),
348 ("sparc64-unknown-linux-gnu", sparc64_unknown_linux_gnu),
349 ("arm-unknown-linux-gnueabi", arm_unknown_linux_gnueabi),
350 ("arm-unknown-linux-gnueabihf", arm_unknown_linux_gnueabihf),
351 ("arm-unknown-linux-musleabi", arm_unknown_linux_musleabi),
352 ("arm-unknown-linux-musleabihf", arm_unknown_linux_musleabihf),
353 ("armv4t-unknown-linux-gnueabi", armv4t_unknown_linux_gnueabi),
354 ("armv5te-unknown-linux-gnueabi", armv5te_unknown_linux_gnueabi),
355 ("armv5te-unknown-linux-musleabi", armv5te_unknown_linux_musleabi),
356 ("armv7-unknown-linux-gnueabi", armv7_unknown_linux_gnueabi),
357 ("armv7-unknown-linux-gnueabihf", armv7_unknown_linux_gnueabihf),
358 ("thumbv7neon-unknown-linux-gnueabihf", thumbv7neon_unknown_linux_gnueabihf),
359 ("thumbv7neon-unknown-linux-musleabihf", thumbv7neon_unknown_linux_musleabihf),
360 ("armv7-unknown-linux-musleabi", armv7_unknown_linux_musleabi),
361 ("armv7-unknown-linux-musleabihf", armv7_unknown_linux_musleabihf),
362 ("aarch64-unknown-linux-gnu", aarch64_unknown_linux_gnu),
363 ("aarch64-unknown-linux-musl", aarch64_unknown_linux_musl),
364 ("x86_64-unknown-linux-musl", x86_64_unknown_linux_musl),
365 ("i686-unknown-linux-musl", i686_unknown_linux_musl),
366 ("i586-unknown-linux-musl", i586_unknown_linux_musl),
367 ("mips-unknown-linux-musl", mips_unknown_linux_musl),
368 ("mipsel-unknown-linux-musl", mipsel_unknown_linux_musl),
369 ("mips64-unknown-linux-muslabi64", mips64_unknown_linux_muslabi64),
370 ("mips64el-unknown-linux-muslabi64", mips64el_unknown_linux_muslabi64),
371 ("hexagon-unknown-linux-musl", hexagon_unknown_linux_musl),
373 ("mips-unknown-linux-uclibc", mips_unknown_linux_uclibc),
374 ("mipsel-unknown-linux-uclibc", mipsel_unknown_linux_uclibc),
376 ("i686-linux-android", i686_linux_android),
377 ("x86_64-linux-android", x86_64_linux_android),
378 ("arm-linux-androideabi", arm_linux_androideabi),
379 ("armv7-linux-androideabi", armv7_linux_androideabi),
380 ("thumbv7neon-linux-androideabi", thumbv7neon_linux_androideabi),
381 ("aarch64-linux-android", aarch64_linux_android),
383 ("x86_64-linux-kernel", x86_64_linux_kernel),
385 ("aarch64-unknown-freebsd", aarch64_unknown_freebsd),
386 ("armv6-unknown-freebsd", armv6_unknown_freebsd),
387 ("armv7-unknown-freebsd", armv7_unknown_freebsd),
388 ("i686-unknown-freebsd", i686_unknown_freebsd),
389 ("powerpc64-unknown-freebsd", powerpc64_unknown_freebsd),
390 ("x86_64-unknown-freebsd", x86_64_unknown_freebsd),
392 ("x86_64-unknown-dragonfly", x86_64_unknown_dragonfly),
394 ("aarch64-unknown-openbsd", aarch64_unknown_openbsd),
395 ("i686-unknown-openbsd", i686_unknown_openbsd),
396 ("sparc64-unknown-openbsd", sparc64_unknown_openbsd),
397 ("x86_64-unknown-openbsd", x86_64_unknown_openbsd),
399 ("aarch64-unknown-netbsd", aarch64_unknown_netbsd),
400 ("armv6-unknown-netbsd-eabihf", armv6_unknown_netbsd_eabihf),
401 ("armv7-unknown-netbsd-eabihf", armv7_unknown_netbsd_eabihf),
402 ("i686-unknown-netbsd", i686_unknown_netbsd),
403 ("powerpc-unknown-netbsd", powerpc_unknown_netbsd),
404 ("sparc64-unknown-netbsd", sparc64_unknown_netbsd),
405 ("x86_64-unknown-netbsd", x86_64_unknown_netbsd),
406 ("x86_64-rumprun-netbsd", x86_64_rumprun_netbsd),
408 ("i686-unknown-haiku", i686_unknown_haiku),
409 ("x86_64-unknown-haiku", x86_64_unknown_haiku),
411 ("x86_64-apple-darwin", x86_64_apple_darwin),
412 ("i686-apple-darwin", i686_apple_darwin),
414 ("aarch64-fuchsia", aarch64_fuchsia),
415 ("x86_64-fuchsia", x86_64_fuchsia),
417 ("x86_64-unknown-l4re-uclibc", x86_64_unknown_l4re_uclibc),
419 ("aarch64-unknown-redox", aarch64_unknown_redox),
420 ("x86_64-unknown-redox", x86_64_unknown_redox),
422 ("i386-apple-ios", i386_apple_ios),
423 ("x86_64-apple-ios", x86_64_apple_ios),
424 ("aarch64-apple-ios", aarch64_apple_ios),
425 ("armv7-apple-ios", armv7_apple_ios),
426 ("armv7s-apple-ios", armv7s_apple_ios),
427 ("x86_64-apple-ios-macabi", x86_64_apple_ios_macabi),
428 ("aarch64-apple-tvos", aarch64_apple_tvos),
429 ("x86_64-apple-tvos", x86_64_apple_tvos),
431 ("armebv7r-none-eabi", armebv7r_none_eabi),
432 ("armebv7r-none-eabihf", armebv7r_none_eabihf),
433 ("armv7r-none-eabi", armv7r_none_eabi),
434 ("armv7r-none-eabihf", armv7r_none_eabihf),
436 // `x86_64-pc-solaris` is an alias for `x86_64_sun_solaris` for backwards compatibility reasons.
437 // (See <https://github.com/rust-lang/rust/issues/40531>.)
438 ("x86_64-sun-solaris", "x86_64-pc-solaris", x86_64_sun_solaris),
439 ("sparcv9-sun-solaris", sparcv9_sun_solaris),
441 ("x86_64-pc-windows-gnu", x86_64_pc_windows_gnu),
442 ("i686-pc-windows-gnu", i686_pc_windows_gnu),
443 ("i686-uwp-windows-gnu", i686_uwp_windows_gnu),
444 ("x86_64-uwp-windows-gnu", x86_64_uwp_windows_gnu),
446 ("aarch64-pc-windows-msvc", aarch64_pc_windows_msvc),
447 ("aarch64-uwp-windows-msvc", aarch64_uwp_windows_msvc),
448 ("x86_64-pc-windows-msvc", x86_64_pc_windows_msvc),
449 ("x86_64-uwp-windows-msvc", x86_64_uwp_windows_msvc),
450 ("i686-pc-windows-msvc", i686_pc_windows_msvc),
451 ("i686-uwp-windows-msvc", i686_uwp_windows_msvc),
452 ("i586-pc-windows-msvc", i586_pc_windows_msvc),
453 ("thumbv7a-pc-windows-msvc", thumbv7a_pc_windows_msvc),
455 ("asmjs-unknown-emscripten", asmjs_unknown_emscripten),
456 ("wasm32-unknown-emscripten", wasm32_unknown_emscripten),
457 ("wasm32-unknown-unknown", wasm32_unknown_unknown),
458 ("wasm32-wasi", wasm32_wasi),
460 ("thumbv6m-none-eabi", thumbv6m_none_eabi),
461 ("thumbv7m-none-eabi", thumbv7m_none_eabi),
462 ("thumbv7em-none-eabi", thumbv7em_none_eabi),
463 ("thumbv7em-none-eabihf", thumbv7em_none_eabihf),
464 ("thumbv8m.base-none-eabi", thumbv8m_base_none_eabi),
465 ("thumbv8m.main-none-eabi", thumbv8m_main_none_eabi),
466 ("thumbv8m.main-none-eabihf", thumbv8m_main_none_eabihf),
468 ("armv7a-none-eabi", armv7a_none_eabi),
469 ("armv7a-none-eabihf", armv7a_none_eabihf),
471 ("msp430-none-elf", msp430_none_elf),
473 ("aarch64-unknown-cloudabi", aarch64_unknown_cloudabi),
474 ("armv7-unknown-cloudabi-eabihf", armv7_unknown_cloudabi_eabihf),
475 ("i686-unknown-cloudabi", i686_unknown_cloudabi),
476 ("x86_64-unknown-cloudabi", x86_64_unknown_cloudabi),
478 ("aarch64-unknown-hermit", aarch64_unknown_hermit),
479 ("x86_64-unknown-hermit", x86_64_unknown_hermit),
480 ("x86_64-unknown-hermit-kernel", x86_64_unknown_hermit_kernel),
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),
487 ("riscv64gc-unknown-linux-gnu", riscv64gc_unknown_linux_gnu),
489 ("aarch64-unknown-none", aarch64_unknown_none),
490 ("aarch64-unknown-none-softfloat", aarch64_unknown_none_softfloat),
492 ("x86_64-fortanix-unknown-sgx", x86_64_fortanix_unknown_sgx),
494 ("x86_64-unknown-uefi", x86_64_unknown_uefi),
495 ("i686-unknown-uefi", i686_unknown_uefi),
497 ("nvptx64-nvidia-cuda", nvptx64_nvidia_cuda),
499 ("i686-wrs-vxworks", i686_wrs_vxworks),
500 ("x86_64-wrs-vxworks", x86_64_wrs_vxworks),
501 ("armv7-wrs-vxworks-eabihf", armv7_wrs_vxworks_eabihf),
502 ("aarch64-wrs-vxworks", aarch64_wrs_vxworks),
503 ("powerpc-wrs-vxworks", powerpc_wrs_vxworks),
504 ("powerpc-wrs-vxworks-spe", powerpc_wrs_vxworks_spe),
505 ("powerpc64-wrs-vxworks", powerpc64_wrs_vxworks),
508 /// Everything `rustc` knows about how to compile for a specific target.
510 /// Every field here must be specified, and has no default value.
511 #[derive(PartialEq, Clone, Debug)]
513 /// Target triple to pass to LLVM.
514 pub llvm_target: String,
515 /// String to use as the `target_endian` `cfg` variable.
516 pub target_endian: String,
517 /// String to use as the `target_pointer_width` `cfg` variable.
518 pub target_pointer_width: String,
519 /// Width of c_int type
520 pub target_c_int_width: String,
521 /// OS name to use for conditional compilation.
522 pub target_os: String,
523 /// Environment name to use for conditional compilation.
524 pub target_env: String,
525 /// Vendor name to use for conditional compilation.
526 pub target_vendor: String,
527 /// Architecture to use for ABI considerations. Valid options include: "x86",
528 /// "x86_64", "arm", "aarch64", "mips", "powerpc", "powerpc64", and others.
530 /// [Data layout](http://llvm.org/docs/LangRef.html#data-layout) to pass to LLVM.
531 pub data_layout: String,
532 /// Default linker flavor used if `-C linker-flavor` or `-C linker` are not passed
533 /// on the command line.
534 pub linker_flavor: LinkerFlavor,
535 /// Optional settings with defaults.
536 pub options: TargetOptions,
539 pub trait HasTargetSpec {
540 fn target_spec(&self) -> &Target;
543 impl HasTargetSpec for Target {
544 fn target_spec(&self) -> &Target {
549 /// Optional aspects of a target specification.
551 /// This has an implementation of `Default`, see each field for what the default is. In general,
552 /// these try to take "minimal defaults" that don't assume anything about the runtime they run in.
553 #[derive(PartialEq, Clone, Debug)]
554 pub struct TargetOptions {
555 /// Whether the target is built-in or loaded from a custom target specification.
556 pub is_builtin: bool,
559 pub linker: Option<String>,
561 /// LLD flavor used if `lld` (or `rust-lld`) is specified as a linker
562 /// without clarifying its flavor in any way.
563 pub lld_flavor: LldFlavor,
565 /// Linker arguments that are passed *before* any user-defined libraries.
566 pub pre_link_args: LinkArgs, // ... unconditionally
567 pub pre_link_args_crt: LinkArgs, // ... when linking with a bundled crt
568 /// Objects to link before all others, always found within the
570 pub pre_link_objects_exe: Vec<String>, // ... when linking an executable, unconditionally
571 pub pre_link_objects_exe_crt: Vec<String>, // ... when linking an executable with a bundled crt
572 pub pre_link_objects_dll: Vec<String>, // ... when linking a dylib
573 /// Linker arguments that are unconditionally passed after any
574 /// user-defined but before post_link_objects. Standard platform
575 /// libraries that should be always be linked to, usually go here.
576 pub late_link_args: LinkArgs,
577 /// Linker arguments used in addition to `late_link_args` if at least one
578 /// Rust dependency is dynamically linked.
579 pub late_link_args_dynamic: LinkArgs,
580 /// Linker arguments used in addition to `late_link_args` if aall Rust
581 /// dependencies are statically linked.
582 pub late_link_args_static: LinkArgs,
583 /// Objects to link after all others, always found within the
585 pub post_link_objects: Vec<String>, // ... unconditionally
586 pub post_link_objects_crt: Vec<String>, // ... when linking with a bundled crt
587 /// Linker arguments that are unconditionally passed *after* any
588 /// user-defined libraries.
589 pub post_link_args: LinkArgs,
591 /// Environment variables to be set for the linker invocation.
592 pub link_env: Vec<(String, String)>,
593 /// Environment variables to be removed for the linker invocation.
594 pub link_env_remove: Vec<String>,
596 /// Extra arguments to pass to the external assembler (when used)
597 pub asm_args: Vec<String>,
599 /// Default CPU to pass to LLVM. Corresponds to `llc -mcpu=$cpu`. Defaults
602 /// Default target features to pass to LLVM. These features will *always* be
603 /// passed, and cannot be disabled even via `-C`. Corresponds to `llc
604 /// -mattr=$features`.
605 pub features: String,
606 /// Whether dynamic linking is available on this target. Defaults to false.
607 pub dynamic_linking: bool,
608 /// If dynamic linking is available, whether only cdylibs are supported.
609 pub only_cdylib: bool,
610 /// Whether executables are available on this target. iOS, for example, only allows static
611 /// libraries. Defaults to false.
612 pub executables: bool,
613 /// Relocation model to use in object file. Corresponds to `llc
614 /// -relocation-model=$relocation_model`. Defaults to "pic".
615 pub relocation_model: String,
616 /// Code model to use. Corresponds to `llc -code-model=$code_model`.
617 pub code_model: Option<String>,
618 /// TLS model to use. Options are "global-dynamic" (default), "local-dynamic", "initial-exec"
619 /// and "local-exec". This is similar to the -ftls-model option in GCC/Clang.
620 pub tls_model: String,
621 /// Do not emit code that uses the "red zone", if the ABI has one. Defaults to false.
622 pub disable_redzone: bool,
623 /// Eliminate frame pointers from stack frames if possible. Defaults to true.
624 pub eliminate_frame_pointer: bool,
625 /// Emit each function in its own section. Defaults to true.
626 pub function_sections: bool,
627 /// String to prepend to the name of every dynamic library. Defaults to "lib".
628 pub dll_prefix: String,
629 /// String to append to the name of every dynamic library. Defaults to ".so".
630 pub dll_suffix: String,
631 /// String to append to the name of every executable.
632 pub exe_suffix: String,
633 /// String to prepend to the name of every static library. Defaults to "lib".
634 pub staticlib_prefix: String,
635 /// String to append to the name of every static library. Defaults to ".a".
636 pub staticlib_suffix: String,
637 /// OS family to use for conditional compilation. Valid options: "unix", "windows".
638 pub target_family: Option<String>,
639 /// Whether the target toolchain's ABI supports returning small structs as an integer.
640 pub abi_return_struct_as_int: bool,
641 /// Whether the target toolchain is like macOS's. Only useful for compiling against iOS/macOS,
642 /// in particular running dsymutil and some other stuff like `-dead_strip`. Defaults to false.
643 pub is_like_osx: bool,
644 /// Whether the target toolchain is like Solaris's.
645 /// Only useful for compiling against Illumos/Solaris,
646 /// as they have a different set of linker flags. Defaults to false.
647 pub is_like_solaris: bool,
648 /// Whether the target toolchain is like Windows'. Only useful for compiling against Windows,
649 /// only really used for figuring out how to find libraries, since Windows uses its own
650 /// library naming convention. Defaults to false.
651 pub is_like_windows: bool,
652 pub is_like_msvc: bool,
653 /// Whether the target toolchain is like Android's. Only useful for compiling against Android.
654 /// Defaults to false.
655 pub is_like_android: bool,
656 /// Whether the target toolchain is like Emscripten's. Only useful for compiling with
657 /// Emscripten toolchain.
658 /// Defaults to false.
659 pub is_like_emscripten: bool,
660 /// Whether the target toolchain is like Fuchsia's.
661 pub is_like_fuchsia: bool,
662 /// Whether the linker support GNU-like arguments such as -O. Defaults to false.
663 pub linker_is_gnu: bool,
664 /// The MinGW toolchain has a known issue that prevents it from correctly
665 /// handling COFF object files with more than 2<sup>15</sup> sections. Since each weak
666 /// symbol needs its own COMDAT section, weak linkage implies a large
667 /// number sections that easily exceeds the given limit for larger
668 /// codebases. Consequently we want a way to disallow weak linkage on some
670 pub allows_weak_linkage: bool,
671 /// Whether the linker support rpaths or not. Defaults to false.
673 /// Whether to disable linking to the default libraries, typically corresponds
674 /// to `-nodefaultlibs`. Defaults to true.
675 pub no_default_libraries: bool,
676 /// Dynamically linked executables can be compiled as position independent
677 /// if the default relocation model of position independent code is not
678 /// changed. This is a requirement to take advantage of ASLR, as otherwise
679 /// the functions in the executable are not randomized and can be used
680 /// during an exploit of a vulnerability in any code.
681 pub position_independent_executables: bool,
682 /// Determines if the target always requires using the PLT for indirect
683 /// library calls or not. This controls the default value of the `-Z plt` flag.
685 /// Either partial, full, or off. Full RELRO makes the dynamic linker
686 /// resolve all symbols at startup and marks the GOT read-only before
687 /// starting the program, preventing overwriting the GOT.
688 pub relro_level: RelroLevel,
689 /// Format that archives should be emitted in. This affects whether we use
690 /// LLVM to assemble an archive or fall back to the system linker, and
691 /// currently only "gnu" is used to fall into LLVM. Unknown strings cause
692 /// the system linker to be used.
693 pub archive_format: String,
694 /// Is asm!() allowed? Defaults to true.
696 /// Whether the runtime startup code requires the `main` function be passed
697 /// `argc` and `argv` values.
698 pub main_needs_argc_argv: bool,
700 /// Flag indicating whether ELF TLS (e.g., #[thread_local]) is available for
702 pub has_elf_tls: bool,
703 // This is mainly for easy compatibility with emscripten.
704 // If we give emcc .o files that are actually .bc files it
706 pub obj_is_bitcode: bool,
708 /// Don't use this field; instead use the `.min_atomic_width()` method.
709 pub min_atomic_width: Option<u64>,
711 /// Don't use this field; instead use the `.max_atomic_width()` method.
712 pub max_atomic_width: Option<u64>,
714 /// Whether the target supports atomic CAS operations natively
715 pub atomic_cas: bool,
717 /// Panic strategy: "unwind" or "abort"
718 pub panic_strategy: PanicStrategy,
720 /// A blacklist of ABIs unsupported by the current target. Note that generic
721 /// ABIs are considered to be supported on all platforms and cannot be blacklisted.
722 pub abi_blacklist: Vec<Abi>,
724 /// Whether or not linking dylibs to a static CRT is allowed.
725 pub crt_static_allows_dylibs: bool,
726 /// Whether or not the CRT is statically linked by default.
727 pub crt_static_default: bool,
728 /// Whether or not crt-static is respected by the compiler (or is a no-op).
729 pub crt_static_respected: bool,
731 /// Whether or not stack probes (__rust_probestack) are enabled
732 pub stack_probes: bool,
734 /// The minimum alignment for global symbols.
735 pub min_global_align: Option<u64>,
737 /// Default number of codegen units to use in debug mode
738 pub default_codegen_units: Option<u64>,
740 /// Whether to generate trap instructions in places where optimization would
741 /// otherwise produce control flow that falls through into unrelated memory.
742 pub trap_unreachable: bool,
744 /// This target requires everything to be compiled with LTO to emit a final
745 /// executable, aka there is no native linker for this target.
746 pub requires_lto: bool,
748 /// This target has no support for threads.
749 pub singlethread: bool,
751 /// Whether library functions call lowering/optimization is disabled in LLVM
752 /// for this target unconditionally.
753 pub no_builtins: bool,
755 /// The codegen backend to use for this target, typically "llvm"
756 pub codegen_backend: String,
758 /// The default visibility for symbols in this target should be "hidden"
759 /// rather than "default"
760 pub default_hidden_visibility: bool,
762 /// Whether a .debug_gdb_scripts section will be added to the output object file
763 pub emit_debug_gdb_scripts: bool,
765 /// Whether or not to unconditionally `uwtable` attributes on functions,
766 /// typically because the platform needs to unwind for things like stack
768 pub requires_uwtable: bool,
770 /// Whether or not SIMD types are passed by reference in the Rust ABI,
771 /// typically required if a target can be compiled with a mixed set of
772 /// target features. This is `true` by default, and `false` for targets like
773 /// wasm32 where the whole program either has simd or not.
774 pub simd_types_indirect: bool,
776 /// Pass a list of symbol which should be exported in the dylib to the linker.
777 pub limit_rdylib_exports: bool,
779 /// If set, have the linker export exactly these symbols, instead of using
780 /// the usual logic to figure this out from the crate itself.
781 pub override_export_symbols: Option<Vec<String>>,
783 /// Determines how or whether the MergeFunctions LLVM pass should run for
784 /// this target. Either "disabled", "trampolines", or "aliases".
785 /// The MergeFunctions pass is generally useful, but some targets may need
786 /// to opt out. The default is "aliases".
788 /// Workaround for: https://github.com/rust-lang/rust/issues/57356
789 pub merge_functions: MergeFunctions,
791 /// Use platform dependent mcount function
792 pub target_mcount: String,
794 /// LLVM ABI name, corresponds to the '-mabi' parameter available in multilib C compilers
795 pub llvm_abiname: String,
797 /// Whether or not RelaxElfRelocation flag will be passed to the linker
798 pub relax_elf_relocations: bool,
800 /// Additional arguments to pass to LLVM, similar to the `-C llvm-args` codegen option.
801 pub llvm_args: Vec<String>,
804 impl Default for TargetOptions {
805 /// Creates a set of "sane defaults" for any target. This is still
806 /// incomplete, and if used for compilation, will certainly not work.
807 fn default() -> TargetOptions {
810 linker: option_env!("CFG_DEFAULT_LINKER").map(|s| s.to_string()),
811 lld_flavor: LldFlavor::Ld,
812 pre_link_args: LinkArgs::new(),
813 pre_link_args_crt: LinkArgs::new(),
814 post_link_args: LinkArgs::new(),
815 asm_args: Vec::new(),
816 cpu: "generic".to_string(),
817 features: String::new(),
818 dynamic_linking: false,
821 relocation_model: "pic".to_string(),
823 tls_model: "global-dynamic".to_string(),
824 disable_redzone: false,
825 eliminate_frame_pointer: true,
826 function_sections: true,
827 dll_prefix: "lib".to_string(),
828 dll_suffix: ".so".to_string(),
829 exe_suffix: String::new(),
830 staticlib_prefix: "lib".to_string(),
831 staticlib_suffix: ".a".to_string(),
833 abi_return_struct_as_int: false,
835 is_like_solaris: false,
836 is_like_windows: false,
837 is_like_android: false,
838 is_like_emscripten: false,
840 is_like_fuchsia: false,
841 linker_is_gnu: false,
842 allows_weak_linkage: true,
844 no_default_libraries: true,
845 position_independent_executables: false,
847 relro_level: RelroLevel::None,
848 pre_link_objects_exe: Vec::new(),
849 pre_link_objects_exe_crt: Vec::new(),
850 pre_link_objects_dll: Vec::new(),
851 post_link_objects: Vec::new(),
852 post_link_objects_crt: Vec::new(),
853 late_link_args: LinkArgs::new(),
854 late_link_args_dynamic: LinkArgs::new(),
855 late_link_args_static: LinkArgs::new(),
856 link_env: Vec::new(),
857 link_env_remove: Vec::new(),
858 archive_format: "gnu".to_string(),
859 main_needs_argc_argv: true,
862 obj_is_bitcode: false,
863 min_atomic_width: None,
864 max_atomic_width: None,
866 panic_strategy: PanicStrategy::Unwind,
867 abi_blacklist: vec![],
868 crt_static_allows_dylibs: false,
869 crt_static_default: false,
870 crt_static_respected: false,
872 min_global_align: None,
873 default_codegen_units: None,
874 trap_unreachable: true,
878 codegen_backend: "llvm".to_string(),
879 default_hidden_visibility: false,
880 emit_debug_gdb_scripts: true,
881 requires_uwtable: false,
882 simd_types_indirect: true,
883 limit_rdylib_exports: true,
884 override_export_symbols: None,
885 merge_functions: MergeFunctions::Aliases,
886 target_mcount: "mcount".to_string(),
887 llvm_abiname: "".to_string(),
888 relax_elf_relocations: false,
895 /// Given a function ABI, turn it into the correct ABI for this target.
896 pub fn adjust_abi(&self, abi: Abi) -> Abi {
899 if self.options.is_like_windows && self.arch == "x86" {
905 // These ABI kinds are ignored on non-x86 Windows targets.
906 // See https://docs.microsoft.com/en-us/cpp/cpp/argument-passing-and-naming-conventions
907 // and the individual pages for __stdcall et al.
908 Abi::Stdcall | Abi::Fastcall | Abi::Vectorcall | Abi::Thiscall => {
909 if self.options.is_like_windows && self.arch != "x86" { Abi::C } else { abi }
912 if self.arch == "x86_64" {
922 /// Minimum integer size in bits that this target can perform atomic
924 pub fn min_atomic_width(&self) -> u64 {
925 self.options.min_atomic_width.unwrap_or(8)
928 /// Maximum integer size in bits that this target can perform atomic
930 pub fn max_atomic_width(&self) -> u64 {
931 self.options.max_atomic_width.unwrap_or_else(|| self.target_pointer_width.parse().unwrap())
934 pub fn is_abi_supported(&self, abi: Abi) -> bool {
935 abi.generic() || !self.options.abi_blacklist.contains(&abi)
938 /// Loads a target descriptor from a JSON object.
939 pub fn from_json(obj: Json) -> TargetResult {
940 // While ugly, this code must remain this way to retain
941 // compatibility with existing JSON fields and the internal
942 // expected naming of the Target and TargetOptions structs.
943 // To ensure compatibility is retained, the built-in targets
944 // are round-tripped through this code to catch cases where
945 // the JSON parser is not updated to match the structs.
947 let get_req_field = |name: &str| {
949 .map(|s| s.as_string())
950 .and_then(|os| os.map(|s| s.to_string()))
951 .ok_or_else(|| format!("Field {} in target specification is required", name))
954 let get_opt_field = |name: &str, default: &str| {
956 .and_then(|s| s.as_string())
957 .map(|s| s.to_string())
958 .unwrap_or_else(|| default.to_string())
961 let mut base = Target {
962 llvm_target: get_req_field("llvm-target")?,
963 target_endian: get_req_field("target-endian")?,
964 target_pointer_width: get_req_field("target-pointer-width")?,
965 target_c_int_width: get_req_field("target-c-int-width")?,
966 data_layout: get_req_field("data-layout")?,
967 arch: get_req_field("arch")?,
968 target_os: get_req_field("os")?,
969 target_env: get_opt_field("env", ""),
970 target_vendor: get_opt_field("vendor", "unknown"),
971 linker_flavor: LinkerFlavor::from_str(&*get_req_field("linker-flavor")?)
972 .ok_or_else(|| format!("linker flavor must be {}", LinkerFlavor::one_of()))?,
973 options: Default::default(),
977 ($key_name:ident) => ( {
978 let name = (stringify!($key_name)).replace("_", "-");
979 obj.find(&name[..]).map(|o| o.as_string()
980 .map(|s| base.options.$key_name = s.to_string()));
982 ($key_name:ident, bool) => ( {
983 let name = (stringify!($key_name)).replace("_", "-");
985 .map(|o| o.as_boolean()
986 .map(|s| base.options.$key_name = s));
988 ($key_name:ident, Option<u64>) => ( {
989 let name = (stringify!($key_name)).replace("_", "-");
992 .map(|s| base.options.$key_name = Some(s)));
994 ($key_name:ident, MergeFunctions) => ( {
995 let name = (stringify!($key_name)).replace("_", "-");
996 obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
997 match s.parse::<MergeFunctions>() {
998 Ok(mergefunc) => base.options.$key_name = mergefunc,
999 _ => return Some(Err(format!("'{}' is not a valid value for \
1000 merge-functions. Use 'disabled', \
1001 'trampolines', or 'aliases'.",
1005 })).unwrap_or(Ok(()))
1007 ($key_name:ident, PanicStrategy) => ( {
1008 let name = (stringify!($key_name)).replace("_", "-");
1009 obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
1011 "unwind" => base.options.$key_name = PanicStrategy::Unwind,
1012 "abort" => base.options.$key_name = PanicStrategy::Abort,
1013 _ => return Some(Err(format!("'{}' is not a valid value for \
1014 panic-strategy. Use 'unwind' or 'abort'.",
1018 })).unwrap_or(Ok(()))
1020 ($key_name:ident, RelroLevel) => ( {
1021 let name = (stringify!($key_name)).replace("_", "-");
1022 obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
1023 match s.parse::<RelroLevel>() {
1024 Ok(level) => base.options.$key_name = level,
1025 _ => return Some(Err(format!("'{}' is not a valid value for \
1026 relro-level. Use 'full', 'partial, or 'off'.",
1030 })).unwrap_or(Ok(()))
1032 ($key_name:ident, list) => ( {
1033 let name = (stringify!($key_name)).replace("_", "-");
1034 obj.find(&name[..]).map(|o| o.as_array()
1035 .map(|v| base.options.$key_name = v.iter()
1036 .map(|a| a.as_string().unwrap().to_string()).collect()
1040 ($key_name:ident, opt_list) => ( {
1041 let name = (stringify!($key_name)).replace("_", "-");
1042 obj.find(&name[..]).map(|o| o.as_array()
1043 .map(|v| base.options.$key_name = Some(v.iter()
1044 .map(|a| a.as_string().unwrap().to_string()).collect())
1048 ($key_name:ident, optional) => ( {
1049 let name = (stringify!($key_name)).replace("_", "-");
1050 if let Some(o) = obj.find(&name[..]) {
1051 base.options.$key_name = o
1053 .map(|s| s.to_string() );
1056 ($key_name:ident, LldFlavor) => ( {
1057 let name = (stringify!($key_name)).replace("_", "-");
1058 obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
1059 if let Some(flavor) = LldFlavor::from_str(&s) {
1060 base.options.$key_name = flavor;
1062 return Some(Err(format!(
1063 "'{}' is not a valid value for lld-flavor. \
1064 Use 'darwin', 'gnu', 'link' or 'wasm.",
1068 })).unwrap_or(Ok(()))
1070 ($key_name:ident, LinkerFlavor) => ( {
1071 let name = (stringify!($key_name)).replace("_", "-");
1072 obj.find(&name[..]).and_then(|o| o.as_string().map(|s| {
1073 LinkerFlavor::from_str(&s).ok_or_else(|| {
1074 Err(format!("'{}' is not a valid value for linker-flavor. \
1075 Use 'em', 'gcc', 'ld' or 'msvc.", s))
1077 })).unwrap_or(Ok(()))
1079 ($key_name:ident, link_args) => ( {
1080 let name = (stringify!($key_name)).replace("_", "-");
1081 if let Some(val) = obj.find(&name[..]) {
1082 let obj = val.as_object().ok_or_else(|| format!("{}: expected a \
1083 JSON object with fields per linker-flavor.", name))?;
1084 let mut args = LinkArgs::new();
1086 let flavor = LinkerFlavor::from_str(&k).ok_or_else(|| {
1087 format!("{}: '{}' is not a valid value for linker-flavor. \
1088 Use 'em', 'gcc', 'ld' or 'msvc'", name, k)
1091 let v = v.as_array().ok_or_else(||
1092 format!("{}.{}: expected a JSON array", name, k)
1093 )?.iter().enumerate()
1095 let s = s.as_string().ok_or_else(||
1096 format!("{}.{}[{}]: expected a JSON string", name, k, i))?;
1099 .collect::<Result<Vec<_>, String>>()?;
1101 args.insert(flavor, v);
1103 base.options.$key_name = args;
1106 ($key_name:ident, env) => ( {
1107 let name = (stringify!($key_name)).replace("_", "-");
1108 if let Some(a) = obj.find(&name[..]).and_then(|o| o.as_array()) {
1110 if let Some(s) = o.as_string() {
1111 let p = s.split('=').collect::<Vec<_>>();
1113 let k = p[0].to_string();
1114 let v = p[1].to_string();
1115 base.options.$key_name.push((k, v));
1123 key!(is_builtin, bool);
1124 key!(linker, optional);
1125 key!(lld_flavor, LldFlavor)?;
1126 key!(pre_link_args, link_args);
1127 key!(pre_link_args_crt, link_args);
1128 key!(pre_link_objects_exe, list);
1129 key!(pre_link_objects_exe_crt, list);
1130 key!(pre_link_objects_dll, list);
1131 key!(late_link_args, link_args);
1132 key!(late_link_args_dynamic, link_args);
1133 key!(late_link_args_static, link_args);
1134 key!(post_link_objects, list);
1135 key!(post_link_objects_crt, list);
1136 key!(post_link_args, link_args);
1137 key!(link_env, env);
1138 key!(link_env_remove, list);
1139 key!(asm_args, list);
1142 key!(dynamic_linking, bool);
1143 key!(only_cdylib, bool);
1144 key!(executables, bool);
1145 key!(relocation_model);
1146 key!(code_model, optional);
1148 key!(disable_redzone, bool);
1149 key!(eliminate_frame_pointer, bool);
1150 key!(function_sections, bool);
1154 key!(staticlib_prefix);
1155 key!(staticlib_suffix);
1156 key!(target_family, optional);
1157 key!(abi_return_struct_as_int, bool);
1158 key!(is_like_osx, bool);
1159 key!(is_like_solaris, bool);
1160 key!(is_like_windows, bool);
1161 key!(is_like_msvc, bool);
1162 key!(is_like_emscripten, bool);
1163 key!(is_like_android, bool);
1164 key!(is_like_fuchsia, bool);
1165 key!(linker_is_gnu, bool);
1166 key!(allows_weak_linkage, bool);
1167 key!(has_rpath, bool);
1168 key!(no_default_libraries, bool);
1169 key!(position_independent_executables, bool);
1170 key!(needs_plt, bool);
1171 key!(relro_level, RelroLevel)?;
1172 key!(archive_format);
1173 key!(allow_asm, bool);
1174 key!(main_needs_argc_argv, bool);
1175 key!(has_elf_tls, bool);
1176 key!(obj_is_bitcode, bool);
1177 key!(max_atomic_width, Option<u64>);
1178 key!(min_atomic_width, Option<u64>);
1179 key!(atomic_cas, bool);
1180 key!(panic_strategy, PanicStrategy)?;
1181 key!(crt_static_allows_dylibs, bool);
1182 key!(crt_static_default, bool);
1183 key!(crt_static_respected, bool);
1184 key!(stack_probes, bool);
1185 key!(min_global_align, Option<u64>);
1186 key!(default_codegen_units, Option<u64>);
1187 key!(trap_unreachable, bool);
1188 key!(requires_lto, bool);
1189 key!(singlethread, bool);
1190 key!(no_builtins, bool);
1191 key!(codegen_backend);
1192 key!(default_hidden_visibility, bool);
1193 key!(emit_debug_gdb_scripts, bool);
1194 key!(requires_uwtable, bool);
1195 key!(simd_types_indirect, bool);
1196 key!(limit_rdylib_exports, bool);
1197 key!(override_export_symbols, opt_list);
1198 key!(merge_functions, MergeFunctions)?;
1199 key!(target_mcount);
1201 key!(relax_elf_relocations, bool);
1202 key!(llvm_args, list);
1204 if let Some(array) = obj.find("abi-blacklist").and_then(Json::as_array) {
1205 for name in array.iter().filter_map(|abi| abi.as_string()) {
1206 match lookup_abi(name) {
1210 "The ABI \"{}\" is considered to be supported on \
1211 all targets and cannot be blacklisted",
1216 base.options.abi_blacklist.push(abi)
1219 return Err(format!("Unknown ABI \"{}\" in target specification", name));
1228 /// Search RUST_TARGET_PATH for a JSON file specifying the given target
1229 /// triple. Note that it could also just be a bare filename already, so also
1230 /// check for that. If one of the hardcoded targets we know about, just
1231 /// return it directly.
1233 /// The error string could come from any of the APIs called, including
1234 /// filesystem access and JSON decoding.
1235 pub fn search(target_triple: &TargetTriple) -> Result<Target, String> {
1236 use rustc_serialize::json;
1240 fn load_file(path: &Path) -> Result<Target, String> {
1241 let contents = fs::read(path).map_err(|e| e.to_string())?;
1242 let obj = json::from_reader(&mut &contents[..]).map_err(|e| e.to_string())?;
1243 Target::from_json(obj)
1246 match *target_triple {
1247 TargetTriple::TargetTriple(ref target_triple) => {
1248 // check if triple is in list of supported targets
1249 match load_specific(target_triple) {
1250 Ok(t) => return Ok(t),
1251 Err(LoadTargetError::BuiltinTargetNotFound(_)) => (),
1252 Err(LoadTargetError::Other(e)) => return Err(e),
1255 // search for a file named `target_triple`.json in RUST_TARGET_PATH
1257 let mut target = target_triple.to_string();
1258 target.push_str(".json");
1259 PathBuf::from(target)
1262 let target_path = env::var_os("RUST_TARGET_PATH").unwrap_or_default();
1264 // FIXME 16351: add a sane default search path?
1266 for dir in env::split_paths(&target_path) {
1267 let p = dir.join(&path);
1269 return load_file(&p);
1272 Err(format!("Could not find specification for target {:?}", target_triple))
1274 TargetTriple::TargetPath(ref target_path) => {
1275 if target_path.is_file() {
1276 return load_file(&target_path);
1278 Err(format!("Target path {:?} is not a valid file", target_path))
1284 impl ToJson for Target {
1285 fn to_json(&self) -> Json {
1286 let mut d = BTreeMap::new();
1287 let default: TargetOptions = Default::default();
1289 macro_rules! target_val {
1291 let name = (stringify!($attr)).replace("_", "-");
1292 d.insert(name, self.$attr.to_json());
1294 ($attr:ident, $key_name:expr) => {{
1295 let name = $key_name;
1296 d.insert(name.to_string(), self.$attr.to_json());
1300 macro_rules! target_option_val {
1302 let name = (stringify!($attr)).replace("_", "-");
1303 if default.$attr != self.options.$attr {
1304 d.insert(name, self.options.$attr.to_json());
1307 ($attr:ident, $key_name:expr) => {{
1308 let name = $key_name;
1309 if default.$attr != self.options.$attr {
1310 d.insert(name.to_string(), self.options.$attr.to_json());
1313 (link_args - $attr:ident) => {{
1314 let name = (stringify!($attr)).replace("_", "-");
1315 if default.$attr != self.options.$attr {
1320 .map(|(k, v)| (k.desc().to_owned(), v.clone()))
1321 .collect::<BTreeMap<_, _>>();
1322 d.insert(name, obj.to_json());
1325 (env - $attr:ident) => {{
1326 let name = (stringify!($attr)).replace("_", "-");
1327 if default.$attr != self.options.$attr {
1332 .map(|&(ref k, ref v)| k.clone() + "=" + &v)
1333 .collect::<Vec<_>>();
1334 d.insert(name, obj.to_json());
1339 target_val!(llvm_target);
1340 target_val!(target_endian);
1341 target_val!(target_pointer_width);
1342 target_val!(target_c_int_width);
1344 target_val!(target_os, "os");
1345 target_val!(target_env, "env");
1346 target_val!(target_vendor, "vendor");
1347 target_val!(data_layout);
1348 target_val!(linker_flavor);
1350 target_option_val!(is_builtin);
1351 target_option_val!(linker);
1352 target_option_val!(lld_flavor);
1353 target_option_val!(link_args - pre_link_args);
1354 target_option_val!(link_args - pre_link_args_crt);
1355 target_option_val!(pre_link_objects_exe);
1356 target_option_val!(pre_link_objects_exe_crt);
1357 target_option_val!(pre_link_objects_dll);
1358 target_option_val!(link_args - late_link_args);
1359 target_option_val!(link_args - late_link_args_dynamic);
1360 target_option_val!(link_args - late_link_args_static);
1361 target_option_val!(post_link_objects);
1362 target_option_val!(post_link_objects_crt);
1363 target_option_val!(link_args - post_link_args);
1364 target_option_val!(env - link_env);
1365 target_option_val!(link_env_remove);
1366 target_option_val!(asm_args);
1367 target_option_val!(cpu);
1368 target_option_val!(features);
1369 target_option_val!(dynamic_linking);
1370 target_option_val!(only_cdylib);
1371 target_option_val!(executables);
1372 target_option_val!(relocation_model);
1373 target_option_val!(code_model);
1374 target_option_val!(tls_model);
1375 target_option_val!(disable_redzone);
1376 target_option_val!(eliminate_frame_pointer);
1377 target_option_val!(function_sections);
1378 target_option_val!(dll_prefix);
1379 target_option_val!(dll_suffix);
1380 target_option_val!(exe_suffix);
1381 target_option_val!(staticlib_prefix);
1382 target_option_val!(staticlib_suffix);
1383 target_option_val!(target_family);
1384 target_option_val!(abi_return_struct_as_int);
1385 target_option_val!(is_like_osx);
1386 target_option_val!(is_like_solaris);
1387 target_option_val!(is_like_windows);
1388 target_option_val!(is_like_msvc);
1389 target_option_val!(is_like_emscripten);
1390 target_option_val!(is_like_android);
1391 target_option_val!(is_like_fuchsia);
1392 target_option_val!(linker_is_gnu);
1393 target_option_val!(allows_weak_linkage);
1394 target_option_val!(has_rpath);
1395 target_option_val!(no_default_libraries);
1396 target_option_val!(position_independent_executables);
1397 target_option_val!(needs_plt);
1398 target_option_val!(relro_level);
1399 target_option_val!(archive_format);
1400 target_option_val!(allow_asm);
1401 target_option_val!(main_needs_argc_argv);
1402 target_option_val!(has_elf_tls);
1403 target_option_val!(obj_is_bitcode);
1404 target_option_val!(min_atomic_width);
1405 target_option_val!(max_atomic_width);
1406 target_option_val!(atomic_cas);
1407 target_option_val!(panic_strategy);
1408 target_option_val!(crt_static_allows_dylibs);
1409 target_option_val!(crt_static_default);
1410 target_option_val!(crt_static_respected);
1411 target_option_val!(stack_probes);
1412 target_option_val!(min_global_align);
1413 target_option_val!(default_codegen_units);
1414 target_option_val!(trap_unreachable);
1415 target_option_val!(requires_lto);
1416 target_option_val!(singlethread);
1417 target_option_val!(no_builtins);
1418 target_option_val!(codegen_backend);
1419 target_option_val!(default_hidden_visibility);
1420 target_option_val!(emit_debug_gdb_scripts);
1421 target_option_val!(requires_uwtable);
1422 target_option_val!(simd_types_indirect);
1423 target_option_val!(limit_rdylib_exports);
1424 target_option_val!(override_export_symbols);
1425 target_option_val!(merge_functions);
1426 target_option_val!(target_mcount);
1427 target_option_val!(llvm_abiname);
1428 target_option_val!(relax_elf_relocations);
1429 target_option_val!(llvm_args);
1431 if default.abi_blacklist != self.options.abi_blacklist {
1433 "abi-blacklist".to_string(),
1437 .map(|&name| Abi::name(name).to_json())
1438 .collect::<Vec<_>>()
1447 /// Either a target triple string or a path to a JSON file.
1448 #[derive(PartialEq, Clone, Debug, Hash, RustcEncodable, RustcDecodable)]
1449 pub enum TargetTriple {
1450 TargetTriple(String),
1451 TargetPath(PathBuf),
1455 /// Creates a target triple from the passed target triple string.
1456 pub fn from_triple(triple: &str) -> Self {
1457 TargetTriple::TargetTriple(triple.to_string())
1460 /// Creates a target triple from the passed target path.
1461 pub fn from_path(path: &Path) -> Result<Self, io::Error> {
1462 let canonicalized_path = path.canonicalize()?;
1463 Ok(TargetTriple::TargetPath(canonicalized_path))
1466 /// Returns a string triple for this target.
1468 /// If this target is a path, the file name (without extension) is returned.
1469 pub fn triple(&self) -> &str {
1471 TargetTriple::TargetTriple(ref triple) => triple,
1472 TargetTriple::TargetPath(ref path) => path
1474 .expect("target path must not be empty")
1476 .expect("target path must be valid unicode"),
1480 /// Returns an extended string triple for this target.
1482 /// If this target is a path, a hash of the path is appended to the triple returned
1484 pub fn debug_triple(&self) -> String {
1485 use std::collections::hash_map::DefaultHasher;
1486 use std::hash::{Hash, Hasher};
1488 let triple = self.triple();
1489 if let TargetTriple::TargetPath(ref path) = *self {
1490 let mut hasher = DefaultHasher::new();
1491 path.hash(&mut hasher);
1492 let hash = hasher.finish();
1493 format!("{}-{}", triple, hash)
1500 impl fmt::Display for TargetTriple {
1501 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
1502 write!(f, "{}", self.debug_triple())