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),
203 ("sparcv9-sun-solaris", sparcv9_sun_solaris),
205 ("x86_64-pc-windows-gnu", x86_64_pc_windows_gnu),
206 ("i686-pc-windows-gnu", i686_pc_windows_gnu),
208 ("x86_64-pc-windows-msvc", x86_64_pc_windows_msvc),
209 ("i686-pc-windows-msvc", i686_pc_windows_msvc),
210 ("i586-pc-windows-msvc", i586_pc_windows_msvc),
212 ("le32-unknown-nacl", le32_unknown_nacl),
213 ("asmjs-unknown-emscripten", asmjs_unknown_emscripten),
214 ("wasm32-unknown-emscripten", wasm32_unknown_emscripten),
216 ("thumbv6m-none-eabi", thumbv6m_none_eabi),
217 ("thumbv7m-none-eabi", thumbv7m_none_eabi),
218 ("thumbv7em-none-eabi", thumbv7em_none_eabi),
219 ("thumbv7em-none-eabihf", thumbv7em_none_eabihf),
222 /// Everything `rustc` knows about how to compile for a specific target.
224 /// Every field here must be specified, and has no default value.
225 #[derive(PartialEq, Clone, Debug)]
227 /// Target triple to pass to LLVM.
228 pub llvm_target: String,
229 /// String to use as the `target_endian` `cfg` variable.
230 pub target_endian: String,
231 /// String to use as the `target_pointer_width` `cfg` variable.
232 pub target_pointer_width: String,
233 /// OS name to use for conditional compilation.
234 pub target_os: String,
235 /// Environment name to use for conditional compilation.
236 pub target_env: String,
237 /// Vendor name to use for conditional compilation.
238 pub target_vendor: String,
239 /// Architecture to use for ABI considerations. Valid options: "x86",
240 /// "x86_64", "arm", "aarch64", "mips", "powerpc", and "powerpc64".
242 /// [Data layout](http://llvm.org/docs/LangRef.html#data-layout) to pass to LLVM.
243 pub data_layout: String,
244 /// Optional settings with defaults.
245 pub options: TargetOptions,
248 /// Optional aspects of a target specification.
250 /// This has an implementation of `Default`, see each field for what the default is. In general,
251 /// these try to take "minimal defaults" that don't assume anything about the runtime they run in.
252 #[derive(PartialEq, Clone, Debug)]
253 pub struct TargetOptions {
254 /// Whether the target is built-in or loaded from a custom target specification.
255 pub is_builtin: bool,
257 /// Linker to invoke. Defaults to "cc".
259 /// Archive utility to use when managing archives. Defaults to "ar".
262 /// Linker arguments that are unconditionally passed *before* any
263 /// user-defined libraries.
264 pub pre_link_args: Vec<String>,
265 /// Objects to link before all others, always found within the
267 pub pre_link_objects_exe: Vec<String>, // ... when linking an executable
268 pub pre_link_objects_dll: Vec<String>, // ... when linking a dylib
269 /// Linker arguments that are unconditionally passed after any
270 /// user-defined but before post_link_objects. Standard platform
271 /// libraries that should be always be linked to, usually go here.
272 pub late_link_args: Vec<String>,
273 /// Objects to link after all others, always found within the
275 pub post_link_objects: Vec<String>,
276 /// Linker arguments that are unconditionally passed *after* any
277 /// user-defined libraries.
278 pub post_link_args: Vec<String>,
280 /// Extra arguments to pass to the external assembler (when used)
281 pub asm_args: Vec<String>,
283 /// Default CPU to pass to LLVM. Corresponds to `llc -mcpu=$cpu`. Defaults
286 /// Default target features to pass to LLVM. These features will *always* be
287 /// passed, and cannot be disabled even via `-C`. Corresponds to `llc
288 /// -mattr=$features`.
289 pub features: String,
290 /// Whether dynamic linking is available on this target. Defaults to false.
291 pub dynamic_linking: bool,
292 /// Whether executables are available on this target. iOS, for example, only allows static
293 /// libraries. Defaults to false.
294 pub executables: bool,
295 /// Relocation model to use in object file. Corresponds to `llc
296 /// -relocation-model=$relocation_model`. Defaults to "pic".
297 pub relocation_model: String,
298 /// Code model to use. Corresponds to `llc -code-model=$code_model`. Defaults to "default".
299 pub code_model: String,
300 /// Do not emit code that uses the "red zone", if the ABI has one. Defaults to false.
301 pub disable_redzone: bool,
302 /// Eliminate frame pointers from stack frames if possible. Defaults to true.
303 pub eliminate_frame_pointer: bool,
304 /// Emit each function in its own section. Defaults to true.
305 pub function_sections: bool,
306 /// String to prepend to the name of every dynamic library. Defaults to "lib".
307 pub dll_prefix: String,
308 /// String to append to the name of every dynamic library. Defaults to ".so".
309 pub dll_suffix: String,
310 /// String to append to the name of every executable.
311 pub exe_suffix: String,
312 /// String to prepend to the name of every static library. Defaults to "lib".
313 pub staticlib_prefix: String,
314 /// String to append to the name of every static library. Defaults to ".a".
315 pub staticlib_suffix: String,
316 /// OS family to use for conditional compilation. Valid options: "unix", "windows".
317 pub target_family: Option<String>,
318 /// Whether the target toolchain is like OpenBSD's.
319 /// Only useful for compiling against OpenBSD, for configuring abi when returning a struct.
320 pub is_like_openbsd: bool,
321 /// Whether the target toolchain is like macOS's. Only useful for compiling against iOS/macOS,
322 /// in particular running dsymutil and some other stuff like `-dead_strip`. Defaults to false.
323 pub is_like_osx: bool,
324 /// Whether the target toolchain is like Solaris's.
325 /// Only useful for compiling against Illumos/Solaris,
326 /// as they have a different set of linker flags. Defaults to false.
327 pub is_like_solaris: bool,
328 /// Whether the target toolchain is like Windows'. Only useful for compiling against Windows,
329 /// only really used for figuring out how to find libraries, since Windows uses its own
330 /// library naming convention. Defaults to false.
331 pub is_like_windows: bool,
332 pub is_like_msvc: bool,
333 /// Whether the target toolchain is like Android's. Only useful for compiling against Android.
334 /// Defaults to false.
335 pub is_like_android: bool,
336 /// Whether the target toolchain is like Emscripten's. Only useful for compiling with
337 /// Emscripten toolchain.
338 /// Defaults to false.
339 pub is_like_emscripten: bool,
340 /// Whether the linker support GNU-like arguments such as -O. Defaults to false.
341 pub linker_is_gnu: bool,
342 /// The MinGW toolchain has a known issue that prevents it from correctly
343 /// handling COFF object files with more than 2^15 sections. Since each weak
344 /// symbol needs its own COMDAT section, weak linkage implies a large
345 /// number sections that easily exceeds the given limit for larger
346 /// codebases. Consequently we want a way to disallow weak linkage on some
348 pub allows_weak_linkage: bool,
349 /// Whether the linker support rpaths or not. Defaults to false.
351 /// Whether to disable linking to the default libraries, typically corresponds
352 /// to `-nodefaultlibs`. Defaults to true.
353 pub no_default_libraries: bool,
354 /// Dynamically linked executables can be compiled as position independent
355 /// if the default relocation model of position independent code is not
356 /// changed. This is a requirement to take advantage of ASLR, as otherwise
357 /// the functions in the executable are not randomized and can be used
358 /// during an exploit of a vulnerability in any code.
359 pub position_independent_executables: bool,
360 /// Format that archives should be emitted in. This affects whether we use
361 /// LLVM to assemble an archive or fall back to the system linker, and
362 /// currently only "gnu" is used to fall into LLVM. Unknown strings cause
363 /// the system linker to be used.
364 pub archive_format: String,
365 /// Is asm!() allowed? Defaults to true.
367 /// Whether the target uses a custom unwind resumption routine.
368 /// By default LLVM lowers `resume` instructions into calls to `_Unwind_Resume`
369 /// defined in libgcc. If this option is enabled, the target must provide
370 /// `eh_unwind_resume` lang item.
371 pub custom_unwind_resume: bool,
373 /// Default crate for allocation symbols to link against
374 pub lib_allocation_crate: String,
375 pub exe_allocation_crate: String,
377 /// Flag indicating whether ELF TLS (e.g. #[thread_local]) is available for
379 pub has_elf_tls: bool,
380 // This is mainly for easy compatibility with emscripten.
381 // If we give emcc .o files that are actually .bc files it
383 pub obj_is_bitcode: bool,
385 // LLVM can't produce object files for this target. Instead, we'll make LLVM
386 // emit assembly and then use `gcc` to turn that assembly into an object
388 pub no_integrated_as: bool,
390 /// Don't use this field; instead use the `.min_atomic_width()` method.
391 pub min_atomic_width: Option<u64>,
393 /// Don't use this field; instead use the `.max_atomic_width()` method.
394 pub max_atomic_width: Option<u64>,
396 /// Panic strategy: "unwind" or "abort"
397 pub panic_strategy: PanicStrategy,
399 /// A blacklist of ABIs unsupported by the current target. Note that generic
400 /// ABIs are considered to be supported on all platforms and cannot be blacklisted.
401 pub abi_blacklist: Vec<Abi>,
403 /// Whether or not the CRT is statically linked by default.
404 pub crt_static_default: bool,
407 impl Default for TargetOptions {
408 /// Create a set of "sane defaults" for any target. This is still
409 /// incomplete, and if used for compilation, will certainly not work.
410 fn default() -> TargetOptions {
413 linker: option_env!("CFG_DEFAULT_LINKER").unwrap_or("cc").to_string(),
414 ar: option_env!("CFG_DEFAULT_AR").unwrap_or("ar").to_string(),
415 pre_link_args: Vec::new(),
416 post_link_args: Vec::new(),
417 asm_args: Vec::new(),
418 cpu: "generic".to_string(),
419 features: "".to_string(),
420 dynamic_linking: false,
422 relocation_model: "pic".to_string(),
423 code_model: "default".to_string(),
424 disable_redzone: false,
425 eliminate_frame_pointer: true,
426 function_sections: true,
427 dll_prefix: "lib".to_string(),
428 dll_suffix: ".so".to_string(),
429 exe_suffix: "".to_string(),
430 staticlib_prefix: "lib".to_string(),
431 staticlib_suffix: ".a".to_string(),
433 is_like_openbsd: false,
435 is_like_solaris: false,
436 is_like_windows: false,
437 is_like_android: false,
438 is_like_emscripten: false,
440 linker_is_gnu: false,
441 allows_weak_linkage: true,
443 no_default_libraries: true,
444 position_independent_executables: false,
445 pre_link_objects_exe: Vec::new(),
446 pre_link_objects_dll: Vec::new(),
447 post_link_objects: Vec::new(),
448 late_link_args: Vec::new(),
449 archive_format: "gnu".to_string(),
450 custom_unwind_resume: false,
451 lib_allocation_crate: "alloc_system".to_string(),
452 exe_allocation_crate: "alloc_system".to_string(),
455 obj_is_bitcode: false,
456 no_integrated_as: false,
457 min_atomic_width: None,
458 max_atomic_width: None,
459 panic_strategy: PanicStrategy::Unwind,
460 abi_blacklist: vec![],
461 crt_static_default: false,
467 /// Given a function ABI, turn "System" into the correct ABI for this target.
468 pub fn adjust_abi(&self, abi: Abi) -> Abi {
471 if self.options.is_like_windows && self.arch == "x86" {
481 /// Minimum integer size in bits that this target can perform atomic
483 pub fn min_atomic_width(&self) -> u64 {
484 self.options.min_atomic_width.unwrap_or(8)
487 /// Maximum integer size in bits that this target can perform atomic
489 pub fn max_atomic_width(&self) -> u64 {
490 self.options.max_atomic_width.unwrap_or(self.target_pointer_width.parse().unwrap())
493 pub fn is_abi_supported(&self, abi: Abi) -> bool {
494 abi.generic() || !self.options.abi_blacklist.contains(&abi)
497 /// Load a target descriptor from a JSON object.
498 pub fn from_json(obj: Json) -> TargetResult {
499 // While ugly, this code must remain this way to retain
500 // compatibility with existing JSON fields and the internal
501 // expected naming of the Target and TargetOptions structs.
502 // To ensure compatibility is retained, the built-in targets
503 // are round-tripped through this code to catch cases where
504 // the JSON parser is not updated to match the structs.
506 let get_req_field = |name: &str| {
508 .map(|s| s.as_string())
509 .and_then(|os| os.map(|s| s.to_string())) {
510 Some(val) => Ok(val),
512 return Err(format!("Field {} in target specification is required", name))
517 let get_opt_field = |name: &str, default: &str| {
518 obj.find(name).and_then(|s| s.as_string())
519 .map(|s| s.to_string())
520 .unwrap_or(default.to_string())
523 let mut base = Target {
524 llvm_target: get_req_field("llvm-target")?,
525 target_endian: get_req_field("target-endian")?,
526 target_pointer_width: get_req_field("target-pointer-width")?,
527 data_layout: get_req_field("data-layout")?,
528 arch: get_req_field("arch")?,
529 target_os: get_req_field("os")?,
530 target_env: get_opt_field("env", ""),
531 target_vendor: get_opt_field("vendor", "unknown"),
532 options: Default::default(),
536 ($key_name:ident) => ( {
537 let name = (stringify!($key_name)).replace("_", "-");
538 obj.find(&name[..]).map(|o| o.as_string()
539 .map(|s| base.options.$key_name = s.to_string()));
541 ($key_name:ident, bool) => ( {
542 let name = (stringify!($key_name)).replace("_", "-");
544 .map(|o| o.as_boolean()
545 .map(|s| base.options.$key_name = s));
547 ($key_name:ident, Option<u64>) => ( {
548 let name = (stringify!($key_name)).replace("_", "-");
551 .map(|s| base.options.$key_name = Some(s)));
553 ($key_name:ident, PanicStrategy) => ( {
554 let name = (stringify!($key_name)).replace("_", "-");
555 obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
557 "unwind" => base.options.$key_name = PanicStrategy::Unwind,
558 "abort" => base.options.$key_name = PanicStrategy::Abort,
559 _ => return Some(Err(format!("'{}' is not a valid value for \
560 panic-strategy. Use 'unwind' or 'abort'.",
564 })).unwrap_or(Ok(()))
566 ($key_name:ident, list) => ( {
567 let name = (stringify!($key_name)).replace("_", "-");
568 obj.find(&name[..]).map(|o| o.as_array()
569 .map(|v| base.options.$key_name = v.iter()
570 .map(|a| a.as_string().unwrap().to_string()).collect()
574 ($key_name:ident, optional) => ( {
575 let name = (stringify!($key_name)).replace("_", "-");
576 if let Some(o) = obj.find(&name[..]) {
577 base.options.$key_name = o
579 .map(|s| s.to_string() );
584 key!(is_builtin, bool);
587 key!(pre_link_args, list);
588 key!(pre_link_objects_exe, list);
589 key!(pre_link_objects_dll, list);
590 key!(late_link_args, list);
591 key!(post_link_objects, list);
592 key!(post_link_args, list);
593 key!(asm_args, list);
596 key!(dynamic_linking, bool);
597 key!(executables, bool);
598 key!(relocation_model);
600 key!(disable_redzone, bool);
601 key!(eliminate_frame_pointer, bool);
602 key!(function_sections, bool);
606 key!(staticlib_prefix);
607 key!(staticlib_suffix);
608 key!(target_family, optional);
609 key!(is_like_openbsd, bool);
610 key!(is_like_osx, bool);
611 key!(is_like_solaris, bool);
612 key!(is_like_windows, bool);
613 key!(is_like_msvc, bool);
614 key!(is_like_emscripten, bool);
615 key!(is_like_android, bool);
616 key!(linker_is_gnu, bool);
617 key!(allows_weak_linkage, bool);
618 key!(has_rpath, bool);
619 key!(no_default_libraries, bool);
620 key!(position_independent_executables, bool);
621 key!(archive_format);
622 key!(allow_asm, bool);
623 key!(custom_unwind_resume, bool);
624 key!(lib_allocation_crate);
625 key!(exe_allocation_crate);
626 key!(has_elf_tls, bool);
627 key!(obj_is_bitcode, bool);
628 key!(no_integrated_as, bool);
629 key!(max_atomic_width, Option<u64>);
630 key!(min_atomic_width, Option<u64>);
631 try!(key!(panic_strategy, PanicStrategy));
632 key!(crt_static_default, bool);
634 if let Some(array) = obj.find("abi-blacklist").and_then(Json::as_array) {
635 for name in array.iter().filter_map(|abi| abi.as_string()) {
636 match lookup_abi(name) {
639 return Err(format!("The ABI \"{}\" is considered to be supported on \
640 all targets and cannot be blacklisted", abi))
643 base.options.abi_blacklist.push(abi)
645 None => return Err(format!("Unknown ABI \"{}\" in target specification", name))
653 /// Search RUST_TARGET_PATH for a JSON file specifying the given target
654 /// triple. Note that it could also just be a bare filename already, so also
655 /// check for that. If one of the hardcoded targets we know about, just
656 /// return it directly.
658 /// The error string could come from any of the APIs called, including
659 /// filesystem access and JSON decoding.
660 pub fn search(target: &str) -> Result<Target, String> {
662 use std::ffi::OsString;
664 use std::path::{Path, PathBuf};
667 fn load_file(path: &Path) -> Result<Target, String> {
668 let mut f = File::open(path).map_err(|e| e.to_string())?;
669 let mut contents = Vec::new();
670 f.read_to_end(&mut contents).map_err(|e| e.to_string())?;
671 let obj = json::from_reader(&mut &contents[..])
672 .map_err(|e| e.to_string())?;
673 Target::from_json(obj)
676 if let Ok(t) = load_specific(target) {
680 let path = Path::new(target);
683 return load_file(&path);
687 let mut target = target.to_string();
688 target.push_str(".json");
689 PathBuf::from(target)
692 let target_path = env::var_os("RUST_TARGET_PATH")
693 .unwrap_or(OsString::new());
695 // FIXME 16351: add a sane default search path?
697 for dir in env::split_paths(&target_path) {
698 let p = dir.join(&path);
700 return load_file(&p);
704 Err(format!("Could not find specification for target {:?}", target))
708 impl ToJson for Target {
709 fn to_json(&self) -> Json {
710 let mut d = BTreeMap::new();
711 let default: TargetOptions = Default::default();
713 macro_rules! target_val {
715 let name = (stringify!($attr)).replace("_", "-");
716 d.insert(name.to_string(), self.$attr.to_json());
718 ($attr:ident, $key_name:expr) => ( {
719 let name = $key_name;
720 d.insert(name.to_string(), self.$attr.to_json());
724 macro_rules! target_option_val {
726 let name = (stringify!($attr)).replace("_", "-");
727 if default.$attr != self.options.$attr {
728 d.insert(name.to_string(), self.options.$attr.to_json());
731 ($attr:ident, $key_name:expr) => ( {
732 let name = $key_name;
733 if default.$attr != self.options.$attr {
734 d.insert(name.to_string(), self.options.$attr.to_json());
739 target_val!(llvm_target);
740 target_val!(target_endian);
741 target_val!(target_pointer_width);
743 target_val!(target_os, "os");
744 target_val!(target_env, "env");
745 target_val!(target_vendor, "vendor");
747 target_val!(data_layout);
749 target_option_val!(is_builtin);
750 target_option_val!(linker);
751 target_option_val!(ar);
752 target_option_val!(pre_link_args);
753 target_option_val!(pre_link_objects_exe);
754 target_option_val!(pre_link_objects_dll);
755 target_option_val!(late_link_args);
756 target_option_val!(post_link_objects);
757 target_option_val!(post_link_args);
758 target_option_val!(asm_args);
759 target_option_val!(cpu);
760 target_option_val!(features);
761 target_option_val!(dynamic_linking);
762 target_option_val!(executables);
763 target_option_val!(relocation_model);
764 target_option_val!(code_model);
765 target_option_val!(disable_redzone);
766 target_option_val!(eliminate_frame_pointer);
767 target_option_val!(function_sections);
768 target_option_val!(dll_prefix);
769 target_option_val!(dll_suffix);
770 target_option_val!(exe_suffix);
771 target_option_val!(staticlib_prefix);
772 target_option_val!(staticlib_suffix);
773 target_option_val!(target_family);
774 target_option_val!(is_like_openbsd);
775 target_option_val!(is_like_osx);
776 target_option_val!(is_like_solaris);
777 target_option_val!(is_like_windows);
778 target_option_val!(is_like_msvc);
779 target_option_val!(is_like_emscripten);
780 target_option_val!(is_like_android);
781 target_option_val!(linker_is_gnu);
782 target_option_val!(allows_weak_linkage);
783 target_option_val!(has_rpath);
784 target_option_val!(no_default_libraries);
785 target_option_val!(position_independent_executables);
786 target_option_val!(archive_format);
787 target_option_val!(allow_asm);
788 target_option_val!(custom_unwind_resume);
789 target_option_val!(lib_allocation_crate);
790 target_option_val!(exe_allocation_crate);
791 target_option_val!(has_elf_tls);
792 target_option_val!(obj_is_bitcode);
793 target_option_val!(no_integrated_as);
794 target_option_val!(min_atomic_width);
795 target_option_val!(max_atomic_width);
796 target_option_val!(panic_strategy);
797 target_option_val!(crt_static_default);
799 if default.abi_blacklist != self.options.abi_blacklist {
800 d.insert("abi-blacklist".to_string(), self.options.abi_blacklist.iter()
801 .map(Abi::name).map(|name| name.to_json())
802 .collect::<Vec<_>>().to_json());
809 fn maybe_jemalloc() -> String {
810 if cfg!(feature = "jemalloc") {
811 "alloc_jemalloc".to_string()
813 "alloc_system".to_string()