1 // Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 //! [Flexible target specification.](https://github.com/rust-lang/rfcs/pull/131)
13 //! Rust targets a wide variety of usecases, and in the interest of flexibility,
14 //! allows new target triples to be defined in configuration files. Most users
15 //! will not need to care about these, but this is invaluable when porting Rust
16 //! to a new platform, and allows for an unprecedented level of control over how
17 //! the compiler works.
19 //! # Using custom targets
21 //! A target triple, as passed via `rustc --target=TRIPLE`, will first be
22 //! compared against the list of built-in targets. This is to ease distributing
23 //! rustc (no need for configuration files) and also to hold these built-in
24 //! targets as immutable and sacred. If `TRIPLE` is not one of the built-in
25 //! targets, rustc will check if a file named `TRIPLE` exists. If it does, it
26 //! will be loaded as the target configuration. If the file does not exist,
27 //! rustc will search each directory in the environment variable
28 //! `RUST_TARGET_PATH` for a file named `TRIPLE.json`. The first one found will
29 //! be loaded. If no file is found in any of those directories, a fatal error
32 //! Projects defining their own targets should use
33 //! `--target=path/to/my-awesome-platform.json` instead of adding to
34 //! `RUST_TARGET_PATH`.
36 //! # Defining a new target
38 //! Targets are defined using [JSON](http://json.org/). The `Target` struct in
39 //! this module defines the format the JSON file should take, though each
40 //! underscore in the field names should be replaced with a hyphen (`-`) in the
41 //! JSON file. Some fields are required in every target specification, such as
42 //! `llvm-target`, `target-endian`, `target-pointer-width`, `data-layout`,
43 //! `arch`, and `os`. In general, options passed to rustc with `-C` override
44 //! the target's settings, though `target-feature` and `link-args` will *add*
45 //! to the list specified by the target, rather than replace.
47 use serialize::json::{Json, ToJson};
48 use std::collections::BTreeMap;
49 use std::default::Default;
50 use std::io::prelude::*;
51 use syntax::abi::{Abi, lookup as lookup_abi};
70 mod windows_msvc_base;
75 pub type TargetResult = Result<Target, String>;
77 macro_rules! supported_targets {
78 ( $(($triple:expr, $module:ident),)+ ) => (
81 /// List of supported targets
82 const TARGETS: &'static [&'static str] = &[$($triple),*];
84 fn load_specific(target: &str) -> TargetResult {
88 let mut t = $module::target()?;
89 t.options.is_builtin = true;
91 // round-trip through the JSON parser to ensure at
92 // run-time that the parser works correctly
93 t = Target::from_json(t.to_json())?;
94 debug!("Got builtin target: {:?}", t);
98 _ => Err(format!("Unable to find target: {}", target))
102 pub fn get_targets() -> Box<Iterator<Item=String>> {
103 Box::new(TARGETS.iter().filter_map(|t| -> Option<String> {
105 .and(Ok(t.to_string()))
111 mod test_json_encode_decode {
112 use serialize::json::ToJson;
114 $(use super::$module;)*
119 // Grab the TargetResult struct. If we successfully retrieved
120 // a Target, then the test JSON encoding/decoding can run for this
121 // Target on this testing platform (i.e., checking the iOS targets
122 // only on a Mac test platform).
123 let _ = $module::target().map(|original| {
124 let as_json = original.to_json();
125 let parsed = Target::from_json(as_json).unwrap();
126 assert_eq!(original, parsed);
135 ("x86_64-unknown-linux-gnu", x86_64_unknown_linux_gnu),
136 ("i686-unknown-linux-gnu", i686_unknown_linux_gnu),
137 ("i586-unknown-linux-gnu", i586_unknown_linux_gnu),
138 ("mips-unknown-linux-gnu", mips_unknown_linux_gnu),
139 ("mips64-unknown-linux-gnuabi64", mips64_unknown_linux_gnuabi64),
140 ("mips64el-unknown-linux-gnuabi64", mips64el_unknown_linux_gnuabi64),
141 ("mipsel-unknown-linux-gnu", mipsel_unknown_linux_gnu),
142 ("powerpc-unknown-linux-gnu", powerpc_unknown_linux_gnu),
143 ("powerpc64-unknown-linux-gnu", powerpc64_unknown_linux_gnu),
144 ("powerpc64le-unknown-linux-gnu", powerpc64le_unknown_linux_gnu),
145 ("s390x-unknown-linux-gnu", s390x_unknown_linux_gnu),
146 ("arm-unknown-linux-gnueabi", arm_unknown_linux_gnueabi),
147 ("arm-unknown-linux-gnueabihf", arm_unknown_linux_gnueabihf),
148 ("arm-unknown-linux-musleabi", arm_unknown_linux_musleabi),
149 ("arm-unknown-linux-musleabihf", arm_unknown_linux_musleabihf),
150 ("armv5te-unknown-linux-gnueabi", armv5te_unknown_linux_gnueabi),
151 ("armv7-unknown-linux-gnueabihf", armv7_unknown_linux_gnueabihf),
152 ("armv7-unknown-linux-musleabihf", armv7_unknown_linux_musleabihf),
153 ("aarch64-unknown-linux-gnu", aarch64_unknown_linux_gnu),
154 ("x86_64-unknown-linux-musl", x86_64_unknown_linux_musl),
155 ("i686-unknown-linux-musl", i686_unknown_linux_musl),
156 ("mips-unknown-linux-musl", mips_unknown_linux_musl),
157 ("mipsel-unknown-linux-musl", mipsel_unknown_linux_musl),
158 ("mips-unknown-linux-uclibc", mips_unknown_linux_uclibc),
159 ("mipsel-unknown-linux-uclibc", mipsel_unknown_linux_uclibc),
161 ("sparc64-unknown-linux-gnu", sparc64_unknown_linux_gnu),
163 ("i686-linux-android", i686_linux_android),
164 ("arm-linux-androideabi", arm_linux_androideabi),
165 ("armv7-linux-androideabi", armv7_linux_androideabi),
166 ("aarch64-linux-android", aarch64_linux_android),
168 ("aarch64-unknown-freebsd", aarch64_unknown_freebsd),
169 ("i686-unknown-freebsd", i686_unknown_freebsd),
170 ("x86_64-unknown-freebsd", x86_64_unknown_freebsd),
172 ("i686-unknown-dragonfly", i686_unknown_dragonfly),
173 ("x86_64-unknown-dragonfly", x86_64_unknown_dragonfly),
175 ("x86_64-unknown-bitrig", x86_64_unknown_bitrig),
177 ("i686-unknown-openbsd", i686_unknown_openbsd),
178 ("x86_64-unknown-openbsd", x86_64_unknown_openbsd),
180 ("i686-unknown-netbsd", i686_unknown_netbsd),
181 ("sparc64-unknown-netbsd", sparc64_unknown_netbsd),
182 ("x86_64-unknown-netbsd", x86_64_unknown_netbsd),
183 ("x86_64-rumprun-netbsd", x86_64_rumprun_netbsd),
185 ("i686-unknown-haiku", i686_unknown_haiku),
186 ("x86_64-unknown-haiku", x86_64_unknown_haiku),
188 ("x86_64-apple-darwin", x86_64_apple_darwin),
189 ("i686-apple-darwin", i686_apple_darwin),
191 ("aarch64-unknown-fuchsia", aarch64_unknown_fuchsia),
192 ("x86_64-unknown-fuchsia", x86_64_unknown_fuchsia),
194 ("x86_64-unknown-redox", x86_64_unknown_redox),
196 ("i386-apple-ios", i386_apple_ios),
197 ("x86_64-apple-ios", x86_64_apple_ios),
198 ("aarch64-apple-ios", aarch64_apple_ios),
199 ("armv7-apple-ios", armv7_apple_ios),
200 ("armv7s-apple-ios", armv7s_apple_ios),
202 ("x86_64-sun-solaris", x86_64_sun_solaris),
204 ("x86_64-pc-windows-gnu", x86_64_pc_windows_gnu),
205 ("i686-pc-windows-gnu", i686_pc_windows_gnu),
207 ("x86_64-pc-windows-msvc", x86_64_pc_windows_msvc),
208 ("i686-pc-windows-msvc", i686_pc_windows_msvc),
209 ("i586-pc-windows-msvc", i586_pc_windows_msvc),
211 ("le32-unknown-nacl", le32_unknown_nacl),
212 ("asmjs-unknown-emscripten", asmjs_unknown_emscripten),
213 ("wasm32-unknown-emscripten", wasm32_unknown_emscripten),
215 ("thumbv6m-none-eabi", thumbv6m_none_eabi),
216 ("thumbv7m-none-eabi", thumbv7m_none_eabi),
217 ("thumbv7em-none-eabi", thumbv7em_none_eabi),
218 ("thumbv7em-none-eabihf", thumbv7em_none_eabihf),
221 /// Everything `rustc` knows about how to compile for a specific target.
223 /// Every field here must be specified, and has no default value.
224 #[derive(PartialEq, Clone, Debug)]
226 /// Target triple to pass to LLVM.
227 pub llvm_target: String,
228 /// String to use as the `target_endian` `cfg` variable.
229 pub target_endian: String,
230 /// String to use as the `target_pointer_width` `cfg` variable.
231 pub target_pointer_width: String,
232 /// OS name to use for conditional compilation.
233 pub target_os: String,
234 /// Environment name to use for conditional compilation.
235 pub target_env: String,
236 /// Vendor name to use for conditional compilation.
237 pub target_vendor: String,
238 /// Architecture to use for ABI considerations. Valid options: "x86",
239 /// "x86_64", "arm", "aarch64", "mips", "powerpc", and "powerpc64".
241 /// [Data layout](http://llvm.org/docs/LangRef.html#data-layout) to pass to LLVM.
242 pub data_layout: String,
243 /// Optional settings with defaults.
244 pub options: TargetOptions,
247 /// Optional aspects of a target specification.
249 /// This has an implementation of `Default`, see each field for what the default is. In general,
250 /// these try to take "minimal defaults" that don't assume anything about the runtime they run in.
251 #[derive(PartialEq, Clone, Debug)]
252 pub struct TargetOptions {
253 /// Whether the target is built-in or loaded from a custom target specification.
254 pub is_builtin: bool,
256 /// Linker to invoke. Defaults to "cc".
258 /// Archive utility to use when managing archives. Defaults to "ar".
261 /// Linker arguments that are unconditionally passed *before* any
262 /// user-defined libraries.
263 pub pre_link_args: Vec<String>,
264 /// Objects to link before all others, always found within the
266 pub pre_link_objects_exe: Vec<String>, // ... when linking an executable
267 pub pre_link_objects_dll: Vec<String>, // ... when linking a dylib
268 /// Linker arguments that are unconditionally passed after any
269 /// user-defined but before post_link_objects. Standard platform
270 /// libraries that should be always be linked to, usually go here.
271 pub late_link_args: Vec<String>,
272 /// Objects to link after all others, always found within the
274 pub post_link_objects: Vec<String>,
275 /// Linker arguments that are unconditionally passed *after* any
276 /// user-defined libraries.
277 pub post_link_args: Vec<String>,
279 /// Extra arguments to pass to the external assembler (when used)
280 pub asm_args: Vec<String>,
282 /// Default CPU to pass to LLVM. Corresponds to `llc -mcpu=$cpu`. Defaults
285 /// Default target features to pass to LLVM. These features will *always* be
286 /// passed, and cannot be disabled even via `-C`. Corresponds to `llc
287 /// -mattr=$features`.
288 pub features: String,
289 /// Whether dynamic linking is available on this target. Defaults to false.
290 pub dynamic_linking: bool,
291 /// Whether executables are available on this target. iOS, for example, only allows static
292 /// libraries. Defaults to false.
293 pub executables: bool,
294 /// Relocation model to use in object file. Corresponds to `llc
295 /// -relocation-model=$relocation_model`. Defaults to "pic".
296 pub relocation_model: String,
297 /// Code model to use. Corresponds to `llc -code-model=$code_model`. Defaults to "default".
298 pub code_model: String,
299 /// Do not emit code that uses the "red zone", if the ABI has one. Defaults to false.
300 pub disable_redzone: bool,
301 /// Eliminate frame pointers from stack frames if possible. Defaults to true.
302 pub eliminate_frame_pointer: bool,
303 /// Emit each function in its own section. Defaults to true.
304 pub function_sections: bool,
305 /// String to prepend to the name of every dynamic library. Defaults to "lib".
306 pub dll_prefix: String,
307 /// String to append to the name of every dynamic library. Defaults to ".so".
308 pub dll_suffix: String,
309 /// String to append to the name of every executable.
310 pub exe_suffix: String,
311 /// String to prepend to the name of every static library. Defaults to "lib".
312 pub staticlib_prefix: String,
313 /// String to append to the name of every static library. Defaults to ".a".
314 pub staticlib_suffix: String,
315 /// OS family to use for conditional compilation. Valid options: "unix", "windows".
316 pub target_family: Option<String>,
317 /// Whether the target toolchain is like OpenBSD's.
318 /// Only useful for compiling against OpenBSD, for configuring abi when returning a struct.
319 pub is_like_openbsd: bool,
320 /// Whether the target toolchain is like OSX's. Only useful for compiling against iOS/OS X, in
321 /// particular running dsymutil and some other stuff like `-dead_strip`. Defaults to false.
322 pub is_like_osx: bool,
323 /// Whether the target toolchain is like Solaris's.
324 /// Only useful for compiling against Illumos/Solaris,
325 /// as they have a different set of linker flags. Defaults to false.
326 pub is_like_solaris: bool,
327 /// Whether the target toolchain is like Windows'. Only useful for compiling against Windows,
328 /// only really used for figuring out how to find libraries, since Windows uses its own
329 /// library naming convention. Defaults to false.
330 pub is_like_windows: bool,
331 pub is_like_msvc: bool,
332 /// Whether the target toolchain is like Android's. Only useful for compiling against Android.
333 /// Defaults to false.
334 pub is_like_android: bool,
335 /// Whether the target toolchain is like Emscripten's. Only useful for compiling with
336 /// Emscripten toolchain.
337 /// Defaults to false.
338 pub is_like_emscripten: bool,
339 /// Whether the linker support GNU-like arguments such as -O. Defaults to false.
340 pub linker_is_gnu: bool,
341 /// The MinGW toolchain has a known issue that prevents it from correctly
342 /// handling COFF object files with more than 2^15 sections. Since each weak
343 /// symbol needs its own COMDAT section, weak linkage implies a large
344 /// number sections that easily exceeds the given limit for larger
345 /// codebases. Consequently we want a way to disallow weak linkage on some
347 pub allows_weak_linkage: bool,
348 /// Whether the linker support rpaths or not. Defaults to false.
350 /// Whether to disable linking to the default libraries, typically corresponds
351 /// to `-nodefaultlibs`. Defaults to true.
352 pub no_default_libraries: bool,
353 /// Dynamically linked executables can be compiled as position independent
354 /// if the default relocation model of position independent code is not
355 /// changed. This is a requirement to take advantage of ASLR, as otherwise
356 /// the functions in the executable are not randomized and can be used
357 /// during an exploit of a vulnerability in any code.
358 pub position_independent_executables: bool,
359 /// Format that archives should be emitted in. This affects whether we use
360 /// LLVM to assemble an archive or fall back to the system linker, and
361 /// currently only "gnu" is used to fall into LLVM. Unknown strings cause
362 /// the system linker to be used.
363 pub archive_format: String,
364 /// Is asm!() allowed? Defaults to true.
366 /// Whether the target uses a custom unwind resumption routine.
367 /// By default LLVM lowers `resume` instructions into calls to `_Unwind_Resume`
368 /// defined in libgcc. If this option is enabled, the target must provide
369 /// `eh_unwind_resume` lang item.
370 pub custom_unwind_resume: bool,
372 /// Default crate for allocation symbols to link against
373 pub lib_allocation_crate: String,
374 pub exe_allocation_crate: String,
376 /// Flag indicating whether ELF TLS (e.g. #[thread_local]) is available for
378 pub has_elf_tls: bool,
379 // This is mainly for easy compatibility with emscripten.
380 // If we give emcc .o files that are actually .bc files it
382 pub obj_is_bitcode: bool,
384 // LLVM can't produce object files for this target. Instead, we'll make LLVM
385 // emit assembly and then use `gcc` to turn that assembly into an object
387 pub no_integrated_as: bool,
389 /// Don't use this field; instead use the `.min_atomic_width()` method.
390 pub min_atomic_width: Option<u64>,
392 /// Don't use this field; instead use the `.max_atomic_width()` method.
393 pub max_atomic_width: Option<u64>,
395 /// Panic strategy: "unwind" or "abort"
396 pub panic_strategy: PanicStrategy,
398 /// A blacklist of ABIs unsupported by the current target. Note that generic
399 /// ABIs are considered to be supported on all platforms and cannot be blacklisted.
400 pub abi_blacklist: Vec<Abi>,
402 /// Whether or not the CRT is statically linked by default.
403 pub crt_static_default: bool,
406 impl Default for TargetOptions {
407 /// Create a set of "sane defaults" for any target. This is still
408 /// incomplete, and if used for compilation, will certainly not work.
409 fn default() -> TargetOptions {
412 linker: option_env!("CFG_DEFAULT_LINKER").unwrap_or("cc").to_string(),
413 ar: option_env!("CFG_DEFAULT_AR").unwrap_or("ar").to_string(),
414 pre_link_args: Vec::new(),
415 post_link_args: Vec::new(),
416 asm_args: Vec::new(),
417 cpu: "generic".to_string(),
418 features: "".to_string(),
419 dynamic_linking: false,
421 relocation_model: "pic".to_string(),
422 code_model: "default".to_string(),
423 disable_redzone: false,
424 eliminate_frame_pointer: true,
425 function_sections: true,
426 dll_prefix: "lib".to_string(),
427 dll_suffix: ".so".to_string(),
428 exe_suffix: "".to_string(),
429 staticlib_prefix: "lib".to_string(),
430 staticlib_suffix: ".a".to_string(),
432 is_like_openbsd: false,
434 is_like_solaris: false,
435 is_like_windows: false,
436 is_like_android: false,
437 is_like_emscripten: false,
439 linker_is_gnu: false,
440 allows_weak_linkage: true,
442 no_default_libraries: true,
443 position_independent_executables: false,
444 pre_link_objects_exe: Vec::new(),
445 pre_link_objects_dll: Vec::new(),
446 post_link_objects: Vec::new(),
447 late_link_args: Vec::new(),
448 archive_format: "gnu".to_string(),
449 custom_unwind_resume: false,
450 lib_allocation_crate: "alloc_system".to_string(),
451 exe_allocation_crate: "alloc_system".to_string(),
454 obj_is_bitcode: false,
455 no_integrated_as: false,
456 min_atomic_width: None,
457 max_atomic_width: None,
458 panic_strategy: PanicStrategy::Unwind,
459 abi_blacklist: vec![],
460 crt_static_default: false,
466 /// Given a function ABI, turn "System" into the correct ABI for this target.
467 pub fn adjust_abi(&self, abi: Abi) -> Abi {
470 if self.options.is_like_windows && self.arch == "x86" {
480 /// Minimum integer size in bits that this target can perform atomic
482 pub fn min_atomic_width(&self) -> u64 {
483 self.options.min_atomic_width.unwrap_or(8)
486 /// Maximum integer size in bits that this target can perform atomic
488 pub fn max_atomic_width(&self) -> u64 {
489 self.options.max_atomic_width.unwrap_or(self.target_pointer_width.parse().unwrap())
492 pub fn is_abi_supported(&self, abi: Abi) -> bool {
493 abi.generic() || !self.options.abi_blacklist.contains(&abi)
496 /// Load a target descriptor from a JSON object.
497 pub fn from_json(obj: Json) -> TargetResult {
498 // While ugly, this code must remain this way to retain
499 // compatibility with existing JSON fields and the internal
500 // expected naming of the Target and TargetOptions structs.
501 // To ensure compatibility is retained, the built-in targets
502 // are round-tripped through this code to catch cases where
503 // the JSON parser is not updated to match the structs.
505 let get_req_field = |name: &str| {
507 .map(|s| s.as_string())
508 .and_then(|os| os.map(|s| s.to_string())) {
509 Some(val) => Ok(val),
511 return Err(format!("Field {} in target specification is required", name))
516 let get_opt_field = |name: &str, default: &str| {
517 obj.find(name).and_then(|s| s.as_string())
518 .map(|s| s.to_string())
519 .unwrap_or(default.to_string())
522 let mut base = Target {
523 llvm_target: get_req_field("llvm-target")?,
524 target_endian: get_req_field("target-endian")?,
525 target_pointer_width: get_req_field("target-pointer-width")?,
526 data_layout: get_req_field("data-layout")?,
527 arch: get_req_field("arch")?,
528 target_os: get_req_field("os")?,
529 target_env: get_opt_field("env", ""),
530 target_vendor: get_opt_field("vendor", "unknown"),
531 options: Default::default(),
535 ($key_name:ident) => ( {
536 let name = (stringify!($key_name)).replace("_", "-");
537 obj.find(&name[..]).map(|o| o.as_string()
538 .map(|s| base.options.$key_name = s.to_string()));
540 ($key_name:ident, bool) => ( {
541 let name = (stringify!($key_name)).replace("_", "-");
543 .map(|o| o.as_boolean()
544 .map(|s| base.options.$key_name = s));
546 ($key_name:ident, Option<u64>) => ( {
547 let name = (stringify!($key_name)).replace("_", "-");
550 .map(|s| base.options.$key_name = Some(s)));
552 ($key_name:ident, PanicStrategy) => ( {
553 let name = (stringify!($key_name)).replace("_", "-");
554 obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
556 "unwind" => base.options.$key_name = PanicStrategy::Unwind,
557 "abort" => base.options.$key_name = PanicStrategy::Abort,
558 _ => return Some(Err(format!("'{}' is not a valid value for \
559 panic-strategy. Use 'unwind' or 'abort'.",
563 })).unwrap_or(Ok(()))
565 ($key_name:ident, list) => ( {
566 let name = (stringify!($key_name)).replace("_", "-");
567 obj.find(&name[..]).map(|o| o.as_array()
568 .map(|v| base.options.$key_name = v.iter()
569 .map(|a| a.as_string().unwrap().to_string()).collect()
573 ($key_name:ident, optional) => ( {
574 let name = (stringify!($key_name)).replace("_", "-");
575 if let Some(o) = obj.find(&name[..]) {
576 base.options.$key_name = o
578 .map(|s| s.to_string() );
583 key!(is_builtin, bool);
586 key!(pre_link_args, list);
587 key!(pre_link_objects_exe, list);
588 key!(pre_link_objects_dll, list);
589 key!(late_link_args, list);
590 key!(post_link_objects, list);
591 key!(post_link_args, list);
592 key!(asm_args, list);
595 key!(dynamic_linking, bool);
596 key!(executables, bool);
597 key!(relocation_model);
599 key!(disable_redzone, bool);
600 key!(eliminate_frame_pointer, bool);
601 key!(function_sections, bool);
605 key!(staticlib_prefix);
606 key!(staticlib_suffix);
607 key!(target_family, optional);
608 key!(is_like_openbsd, bool);
609 key!(is_like_osx, bool);
610 key!(is_like_solaris, bool);
611 key!(is_like_windows, bool);
612 key!(is_like_msvc, bool);
613 key!(is_like_emscripten, bool);
614 key!(is_like_android, bool);
615 key!(linker_is_gnu, bool);
616 key!(allows_weak_linkage, bool);
617 key!(has_rpath, bool);
618 key!(no_default_libraries, bool);
619 key!(position_independent_executables, bool);
620 key!(archive_format);
621 key!(allow_asm, bool);
622 key!(custom_unwind_resume, bool);
623 key!(lib_allocation_crate);
624 key!(exe_allocation_crate);
625 key!(has_elf_tls, bool);
626 key!(obj_is_bitcode, bool);
627 key!(no_integrated_as, bool);
628 key!(max_atomic_width, Option<u64>);
629 key!(min_atomic_width, Option<u64>);
630 try!(key!(panic_strategy, PanicStrategy));
631 key!(crt_static_default, bool);
633 if let Some(array) = obj.find("abi-blacklist").and_then(Json::as_array) {
634 for name in array.iter().filter_map(|abi| abi.as_string()) {
635 match lookup_abi(name) {
638 return Err(format!("The ABI \"{}\" is considered to be supported on \
639 all targets and cannot be blacklisted", abi))
642 base.options.abi_blacklist.push(abi)
644 None => return Err(format!("Unknown ABI \"{}\" in target specification", name))
652 /// Search RUST_TARGET_PATH for a JSON file specifying the given target
653 /// triple. Note that it could also just be a bare filename already, so also
654 /// check for that. If one of the hardcoded targets we know about, just
655 /// return it directly.
657 /// The error string could come from any of the APIs called, including
658 /// filesystem access and JSON decoding.
659 pub fn search(target: &str) -> Result<Target, String> {
661 use std::ffi::OsString;
663 use std::path::{Path, PathBuf};
666 fn load_file(path: &Path) -> Result<Target, String> {
667 let mut f = File::open(path).map_err(|e| e.to_string())?;
668 let mut contents = Vec::new();
669 f.read_to_end(&mut contents).map_err(|e| e.to_string())?;
670 let obj = json::from_reader(&mut &contents[..])
671 .map_err(|e| e.to_string())?;
672 Target::from_json(obj)
675 if let Ok(t) = load_specific(target) {
679 let path = Path::new(target);
682 return load_file(&path);
686 let mut target = target.to_string();
687 target.push_str(".json");
688 PathBuf::from(target)
691 let target_path = env::var_os("RUST_TARGET_PATH")
692 .unwrap_or(OsString::new());
694 // FIXME 16351: add a sane default search path?
696 for dir in env::split_paths(&target_path) {
697 let p = dir.join(&path);
699 return load_file(&p);
703 Err(format!("Could not find specification for target {:?}", target))
707 impl ToJson for Target {
708 fn to_json(&self) -> Json {
709 let mut d = BTreeMap::new();
710 let default: TargetOptions = Default::default();
712 macro_rules! target_val {
714 let name = (stringify!($attr)).replace("_", "-");
715 d.insert(name.to_string(), self.$attr.to_json());
717 ($attr:ident, $key_name:expr) => ( {
718 let name = $key_name;
719 d.insert(name.to_string(), self.$attr.to_json());
723 macro_rules! target_option_val {
725 let name = (stringify!($attr)).replace("_", "-");
726 if default.$attr != self.options.$attr {
727 d.insert(name.to_string(), self.options.$attr.to_json());
730 ($attr:ident, $key_name:expr) => ( {
731 let name = $key_name;
732 if default.$attr != self.options.$attr {
733 d.insert(name.to_string(), self.options.$attr.to_json());
738 target_val!(llvm_target);
739 target_val!(target_endian);
740 target_val!(target_pointer_width);
742 target_val!(target_os, "os");
743 target_val!(target_env, "env");
744 target_val!(target_vendor, "vendor");
746 target_val!(data_layout);
748 target_option_val!(is_builtin);
749 target_option_val!(linker);
750 target_option_val!(ar);
751 target_option_val!(pre_link_args);
752 target_option_val!(pre_link_objects_exe);
753 target_option_val!(pre_link_objects_dll);
754 target_option_val!(late_link_args);
755 target_option_val!(post_link_objects);
756 target_option_val!(post_link_args);
757 target_option_val!(asm_args);
758 target_option_val!(cpu);
759 target_option_val!(features);
760 target_option_val!(dynamic_linking);
761 target_option_val!(executables);
762 target_option_val!(relocation_model);
763 target_option_val!(code_model);
764 target_option_val!(disable_redzone);
765 target_option_val!(eliminate_frame_pointer);
766 target_option_val!(function_sections);
767 target_option_val!(dll_prefix);
768 target_option_val!(dll_suffix);
769 target_option_val!(exe_suffix);
770 target_option_val!(staticlib_prefix);
771 target_option_val!(staticlib_suffix);
772 target_option_val!(target_family);
773 target_option_val!(is_like_openbsd);
774 target_option_val!(is_like_osx);
775 target_option_val!(is_like_solaris);
776 target_option_val!(is_like_windows);
777 target_option_val!(is_like_msvc);
778 target_option_val!(is_like_emscripten);
779 target_option_val!(is_like_android);
780 target_option_val!(linker_is_gnu);
781 target_option_val!(allows_weak_linkage);
782 target_option_val!(has_rpath);
783 target_option_val!(no_default_libraries);
784 target_option_val!(position_independent_executables);
785 target_option_val!(archive_format);
786 target_option_val!(allow_asm);
787 target_option_val!(custom_unwind_resume);
788 target_option_val!(lib_allocation_crate);
789 target_option_val!(exe_allocation_crate);
790 target_option_val!(has_elf_tls);
791 target_option_val!(obj_is_bitcode);
792 target_option_val!(no_integrated_as);
793 target_option_val!(min_atomic_width);
794 target_option_val!(max_atomic_width);
795 target_option_val!(panic_strategy);
796 target_option_val!(crt_static_default);
798 if default.abi_blacklist != self.options.abi_blacklist {
799 d.insert("abi-blacklist".to_string(), self.options.abi_blacklist.iter()
800 .map(Abi::name).map(|name| name.to_json())
801 .collect::<Vec<_>>().to_json());
808 fn maybe_jemalloc() -> String {
809 if cfg!(feature = "jemalloc") {
810 "alloc_jemalloc".to_string()
812 "alloc_system".to_string()