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};
53 use {LinkerFlavor, PanicStrategy, RelroLevel};
70 mod windows_msvc_base;
76 pub type LinkArgs = BTreeMap<LinkerFlavor, Vec<String>>;
77 pub type TargetResult = Result<Target, String>;
79 macro_rules! supported_targets {
80 ( $(($triple:expr, $module:ident),)+ ) => (
83 /// List of supported targets
84 const TARGETS: &'static [&'static str] = &[$($triple),*];
86 fn load_specific(target: &str) -> TargetResult {
90 let mut t = $module::target()?;
91 t.options.is_builtin = true;
93 // round-trip through the JSON parser to ensure at
94 // run-time that the parser works correctly
95 t = Target::from_json(t.to_json())?;
96 debug!("Got builtin target: {:?}", t);
100 _ => Err(format!("Unable to find target: {}", target))
104 pub fn get_targets() -> Box<Iterator<Item=String>> {
105 Box::new(TARGETS.iter().filter_map(|t| -> Option<String> {
107 .and(Ok(t.to_string()))
113 mod test_json_encode_decode {
114 use serialize::json::ToJson;
116 $(use super::$module;)*
121 // Grab the TargetResult struct. If we successfully retrieved
122 // a Target, then the test JSON encoding/decoding can run for this
123 // Target on this testing platform (i.e., checking the iOS targets
124 // only on a Mac test platform).
125 let _ = $module::target().map(|original| {
126 let as_json = original.to_json();
127 let parsed = Target::from_json(as_json).unwrap();
128 assert_eq!(original, parsed);
137 ("x86_64-unknown-linux-gnu", x86_64_unknown_linux_gnu),
138 ("i686-unknown-linux-gnu", i686_unknown_linux_gnu),
139 ("i586-unknown-linux-gnu", i586_unknown_linux_gnu),
140 ("mips-unknown-linux-gnu", mips_unknown_linux_gnu),
141 ("mips64-unknown-linux-gnuabi64", mips64_unknown_linux_gnuabi64),
142 ("mips64el-unknown-linux-gnuabi64", mips64el_unknown_linux_gnuabi64),
143 ("mipsel-unknown-linux-gnu", mipsel_unknown_linux_gnu),
144 ("powerpc-unknown-linux-gnu", powerpc_unknown_linux_gnu),
145 ("powerpc64-unknown-linux-gnu", powerpc64_unknown_linux_gnu),
146 ("powerpc64le-unknown-linux-gnu", powerpc64le_unknown_linux_gnu),
147 ("s390x-unknown-linux-gnu", s390x_unknown_linux_gnu),
148 ("arm-unknown-linux-gnueabi", arm_unknown_linux_gnueabi),
149 ("arm-unknown-linux-gnueabihf", arm_unknown_linux_gnueabihf),
150 ("arm-unknown-linux-musleabi", arm_unknown_linux_musleabi),
151 ("arm-unknown-linux-musleabihf", arm_unknown_linux_musleabihf),
152 ("armv5te-unknown-linux-gnueabi", armv5te_unknown_linux_gnueabi),
153 ("armv7-unknown-linux-gnueabihf", armv7_unknown_linux_gnueabihf),
154 ("armv7-unknown-linux-musleabihf", armv7_unknown_linux_musleabihf),
155 ("aarch64-unknown-linux-gnu", aarch64_unknown_linux_gnu),
156 ("x86_64-unknown-linux-musl", x86_64_unknown_linux_musl),
157 ("i686-unknown-linux-musl", i686_unknown_linux_musl),
158 ("mips-unknown-linux-musl", mips_unknown_linux_musl),
159 ("mipsel-unknown-linux-musl", mipsel_unknown_linux_musl),
160 ("mips-unknown-linux-uclibc", mips_unknown_linux_uclibc),
161 ("mipsel-unknown-linux-uclibc", mipsel_unknown_linux_uclibc),
163 ("sparc64-unknown-linux-gnu", sparc64_unknown_linux_gnu),
165 ("i686-linux-android", i686_linux_android),
166 ("x86_64-linux-android", x86_64_linux_android),
167 ("arm-linux-androideabi", arm_linux_androideabi),
168 ("armv7-linux-androideabi", armv7_linux_androideabi),
169 ("aarch64-linux-android", aarch64_linux_android),
171 ("aarch64-unknown-freebsd", aarch64_unknown_freebsd),
172 ("i686-unknown-freebsd", i686_unknown_freebsd),
173 ("x86_64-unknown-freebsd", x86_64_unknown_freebsd),
175 ("i686-unknown-dragonfly", i686_unknown_dragonfly),
176 ("x86_64-unknown-dragonfly", x86_64_unknown_dragonfly),
178 ("x86_64-unknown-bitrig", x86_64_unknown_bitrig),
180 ("i686-unknown-openbsd", i686_unknown_openbsd),
181 ("x86_64-unknown-openbsd", x86_64_unknown_openbsd),
183 ("i686-unknown-netbsd", i686_unknown_netbsd),
184 ("sparc64-unknown-netbsd", sparc64_unknown_netbsd),
185 ("x86_64-unknown-netbsd", x86_64_unknown_netbsd),
186 ("x86_64-rumprun-netbsd", x86_64_rumprun_netbsd),
188 ("i686-unknown-haiku", i686_unknown_haiku),
189 ("x86_64-unknown-haiku", x86_64_unknown_haiku),
191 ("x86_64-apple-darwin", x86_64_apple_darwin),
192 ("i686-apple-darwin", i686_apple_darwin),
194 ("aarch64-unknown-fuchsia", aarch64_unknown_fuchsia),
195 ("x86_64-unknown-fuchsia", x86_64_unknown_fuchsia),
197 ("x86_64-unknown-l4re-uclibc", x86_64_unknown_l4re_uclibc),
199 ("x86_64-unknown-redox", x86_64_unknown_redox),
201 ("i386-apple-ios", i386_apple_ios),
202 ("x86_64-apple-ios", x86_64_apple_ios),
203 ("aarch64-apple-ios", aarch64_apple_ios),
204 ("armv7-apple-ios", armv7_apple_ios),
205 ("armv7s-apple-ios", armv7s_apple_ios),
207 ("x86_64-sun-solaris", x86_64_sun_solaris),
208 ("sparcv9-sun-solaris", sparcv9_sun_solaris),
210 ("x86_64-pc-windows-gnu", x86_64_pc_windows_gnu),
211 ("i686-pc-windows-gnu", i686_pc_windows_gnu),
213 ("x86_64-pc-windows-msvc", x86_64_pc_windows_msvc),
214 ("i686-pc-windows-msvc", i686_pc_windows_msvc),
215 ("i586-pc-windows-msvc", i586_pc_windows_msvc),
217 ("le32-unknown-nacl", le32_unknown_nacl),
218 ("asmjs-unknown-emscripten", asmjs_unknown_emscripten),
219 ("wasm32-unknown-emscripten", wasm32_unknown_emscripten),
220 ("wasm32-experimental-emscripten", wasm32_experimental_emscripten),
222 ("thumbv6m-none-eabi", thumbv6m_none_eabi),
223 ("thumbv7m-none-eabi", thumbv7m_none_eabi),
224 ("thumbv7em-none-eabi", thumbv7em_none_eabi),
225 ("thumbv7em-none-eabihf", thumbv7em_none_eabihf),
227 ("msp430-none-elf", msp430_none_elf),
230 /// Everything `rustc` knows about how to compile for a specific target.
232 /// Every field here must be specified, and has no default value.
233 #[derive(PartialEq, Clone, Debug)]
235 /// Target triple to pass to LLVM.
236 pub llvm_target: String,
237 /// String to use as the `target_endian` `cfg` variable.
238 pub target_endian: String,
239 /// String to use as the `target_pointer_width` `cfg` variable.
240 pub target_pointer_width: String,
241 /// OS name to use for conditional compilation.
242 pub target_os: String,
243 /// Environment name to use for conditional compilation.
244 pub target_env: String,
245 /// Vendor name to use for conditional compilation.
246 pub target_vendor: String,
247 /// Architecture to use for ABI considerations. Valid options: "x86",
248 /// "x86_64", "arm", "aarch64", "mips", "powerpc", and "powerpc64".
250 /// [Data layout](http://llvm.org/docs/LangRef.html#data-layout) to pass to LLVM.
251 pub data_layout: String,
253 pub linker_flavor: LinkerFlavor,
254 /// Optional settings with defaults.
255 pub options: TargetOptions,
258 /// Optional aspects of a target specification.
260 /// This has an implementation of `Default`, see each field for what the default is. In general,
261 /// these try to take "minimal defaults" that don't assume anything about the runtime they run in.
262 #[derive(PartialEq, Clone, Debug)]
263 pub struct TargetOptions {
264 /// Whether the target is built-in or loaded from a custom target specification.
265 pub is_builtin: bool,
267 /// Linker to invoke. Defaults to "cc".
269 /// Archive utility to use when managing archives. Defaults to "ar".
272 /// Linker arguments that are unconditionally passed *before* any
273 /// user-defined libraries.
274 pub pre_link_args: LinkArgs,
275 /// Objects to link before all others, always found within the
277 pub pre_link_objects_exe: Vec<String>, // ... when linking an executable
278 pub pre_link_objects_dll: Vec<String>, // ... when linking a dylib
279 /// Linker arguments that are unconditionally passed after any
280 /// user-defined but before post_link_objects. Standard platform
281 /// libraries that should be always be linked to, usually go here.
282 pub late_link_args: LinkArgs,
283 /// Objects to link after all others, always found within the
285 pub post_link_objects: Vec<String>,
286 /// Linker arguments that are unconditionally passed *after* any
287 /// user-defined libraries.
288 pub post_link_args: LinkArgs,
290 /// Environment variables to be set before invoking the linker.
291 pub link_env: Vec<(String, String)>,
293 /// Extra arguments to pass to the external assembler (when used)
294 pub asm_args: Vec<String>,
296 /// Default CPU to pass to LLVM. Corresponds to `llc -mcpu=$cpu`. Defaults
299 /// Default target features to pass to LLVM. These features will *always* be
300 /// passed, and cannot be disabled even via `-C`. Corresponds to `llc
301 /// -mattr=$features`.
302 pub features: String,
303 /// Whether dynamic linking is available on this target. Defaults to false.
304 pub dynamic_linking: bool,
305 /// Whether executables are available on this target. iOS, for example, only allows static
306 /// libraries. Defaults to false.
307 pub executables: bool,
308 /// Relocation model to use in object file. Corresponds to `llc
309 /// -relocation-model=$relocation_model`. Defaults to "pic".
310 pub relocation_model: String,
311 /// Code model to use. Corresponds to `llc -code-model=$code_model`. Defaults to "default".
312 pub code_model: String,
313 /// Do not emit code that uses the "red zone", if the ABI has one. Defaults to false.
314 pub disable_redzone: bool,
315 /// Eliminate frame pointers from stack frames if possible. Defaults to true.
316 pub eliminate_frame_pointer: bool,
317 /// Emit each function in its own section. Defaults to true.
318 pub function_sections: bool,
319 /// String to prepend to the name of every dynamic library. Defaults to "lib".
320 pub dll_prefix: String,
321 /// String to append to the name of every dynamic library. Defaults to ".so".
322 pub dll_suffix: String,
323 /// String to append to the name of every executable.
324 pub exe_suffix: String,
325 /// String to prepend to the name of every static library. Defaults to "lib".
326 pub staticlib_prefix: String,
327 /// String to append to the name of every static library. Defaults to ".a".
328 pub staticlib_suffix: String,
329 /// OS family to use for conditional compilation. Valid options: "unix", "windows".
330 pub target_family: Option<String>,
331 /// Whether the target toolchain is like OpenBSD's.
332 /// Only useful for compiling against OpenBSD, for configuring abi when returning a struct.
333 pub is_like_openbsd: bool,
334 /// Whether the target toolchain is like macOS's. Only useful for compiling against iOS/macOS,
335 /// in particular running dsymutil and some other stuff like `-dead_strip`. Defaults to false.
336 pub is_like_osx: bool,
337 /// Whether the target toolchain is like Solaris's.
338 /// Only useful for compiling against Illumos/Solaris,
339 /// as they have a different set of linker flags. Defaults to false.
340 pub is_like_solaris: bool,
341 /// Whether the target toolchain is like Windows'. Only useful for compiling against Windows,
342 /// only really used for figuring out how to find libraries, since Windows uses its own
343 /// library naming convention. Defaults to false.
344 pub is_like_windows: bool,
345 pub is_like_msvc: bool,
346 /// Whether the target toolchain is like Android's. Only useful for compiling against Android.
347 /// Defaults to false.
348 pub is_like_android: bool,
349 /// Whether the target toolchain is like Emscripten's. Only useful for compiling with
350 /// Emscripten toolchain.
351 /// Defaults to false.
352 pub is_like_emscripten: bool,
353 /// Whether the linker support GNU-like arguments such as -O. Defaults to false.
354 pub linker_is_gnu: bool,
355 /// The MinGW toolchain has a known issue that prevents it from correctly
356 /// handling COFF object files with more than 2^15 sections. Since each weak
357 /// symbol needs its own COMDAT section, weak linkage implies a large
358 /// number sections that easily exceeds the given limit for larger
359 /// codebases. Consequently we want a way to disallow weak linkage on some
361 pub allows_weak_linkage: bool,
362 /// Whether the linker support rpaths or not. Defaults to false.
364 /// Whether to disable linking to the default libraries, typically corresponds
365 /// to `-nodefaultlibs`. Defaults to true.
366 pub no_default_libraries: bool,
367 /// Dynamically linked executables can be compiled as position independent
368 /// if the default relocation model of position independent code is not
369 /// changed. This is a requirement to take advantage of ASLR, as otherwise
370 /// the functions in the executable are not randomized and can be used
371 /// during an exploit of a vulnerability in any code.
372 pub position_independent_executables: bool,
373 /// Either partial, full, or off. Full RELRO makes the dynamic linker
374 /// resolve all symbols at startup and marks the GOT read-only before
375 /// starting the program, preventing overwriting the GOT.
376 pub relro_level: RelroLevel,
377 /// Format that archives should be emitted in. This affects whether we use
378 /// LLVM to assemble an archive or fall back to the system linker, and
379 /// currently only "gnu" is used to fall into LLVM. Unknown strings cause
380 /// the system linker to be used.
381 pub archive_format: String,
382 /// Is asm!() allowed? Defaults to true.
384 /// Whether the target uses a custom unwind resumption routine.
385 /// By default LLVM lowers `resume` instructions into calls to `_Unwind_Resume`
386 /// defined in libgcc. If this option is enabled, the target must provide
387 /// `eh_unwind_resume` lang item.
388 pub custom_unwind_resume: bool,
390 /// If necessary, a different crate to link exe allocators by default
391 pub exe_allocation_crate: Option<String>,
393 /// Flag indicating whether ELF TLS (e.g. #[thread_local]) is available for
395 pub has_elf_tls: bool,
396 // This is mainly for easy compatibility with emscripten.
397 // If we give emcc .o files that are actually .bc files it
399 pub obj_is_bitcode: bool,
401 // LLVM can't produce object files for this target. Instead, we'll make LLVM
402 // emit assembly and then use `gcc` to turn that assembly into an object
404 pub no_integrated_as: bool,
406 /// Don't use this field; instead use the `.min_atomic_width()` method.
407 pub min_atomic_width: Option<u64>,
409 /// Don't use this field; instead use the `.max_atomic_width()` method.
410 pub max_atomic_width: Option<u64>,
412 /// Panic strategy: "unwind" or "abort"
413 pub panic_strategy: PanicStrategy,
415 /// A blacklist of ABIs unsupported by the current target. Note that generic
416 /// ABIs are considered to be supported on all platforms and cannot be blacklisted.
417 pub abi_blacklist: Vec<Abi>,
419 /// Whether or not the CRT is statically linked by default.
420 pub crt_static_default: bool,
422 /// Whether or not stack probes (__rust_probestack) are enabled
423 pub stack_probes: bool,
426 impl Default for TargetOptions {
427 /// Create a set of "sane defaults" for any target. This is still
428 /// incomplete, and if used for compilation, will certainly not work.
429 fn default() -> TargetOptions {
432 linker: option_env!("CFG_DEFAULT_LINKER").unwrap_or("cc").to_string(),
433 ar: option_env!("CFG_DEFAULT_AR").unwrap_or("ar").to_string(),
434 pre_link_args: LinkArgs::new(),
435 post_link_args: LinkArgs::new(),
436 asm_args: Vec::new(),
437 cpu: "generic".to_string(),
438 features: "".to_string(),
439 dynamic_linking: false,
441 relocation_model: "pic".to_string(),
442 code_model: "default".to_string(),
443 disable_redzone: false,
444 eliminate_frame_pointer: true,
445 function_sections: true,
446 dll_prefix: "lib".to_string(),
447 dll_suffix: ".so".to_string(),
448 exe_suffix: "".to_string(),
449 staticlib_prefix: "lib".to_string(),
450 staticlib_suffix: ".a".to_string(),
452 is_like_openbsd: false,
454 is_like_solaris: false,
455 is_like_windows: false,
456 is_like_android: false,
457 is_like_emscripten: false,
459 linker_is_gnu: false,
460 allows_weak_linkage: true,
462 no_default_libraries: true,
463 position_independent_executables: false,
464 relro_level: RelroLevel::Off,
465 pre_link_objects_exe: Vec::new(),
466 pre_link_objects_dll: Vec::new(),
467 post_link_objects: Vec::new(),
468 late_link_args: LinkArgs::new(),
469 link_env: Vec::new(),
470 archive_format: "gnu".to_string(),
471 custom_unwind_resume: false,
472 exe_allocation_crate: None,
475 obj_is_bitcode: false,
476 no_integrated_as: false,
477 min_atomic_width: None,
478 max_atomic_width: None,
479 panic_strategy: PanicStrategy::Unwind,
480 abi_blacklist: vec![],
481 crt_static_default: false,
488 /// Given a function ABI, turn "System" into the correct ABI for this target.
489 pub fn adjust_abi(&self, abi: Abi) -> Abi {
492 if self.options.is_like_windows && self.arch == "x86" {
502 /// Minimum integer size in bits that this target can perform atomic
504 pub fn min_atomic_width(&self) -> u64 {
505 self.options.min_atomic_width.unwrap_or(8)
508 /// Maximum integer size in bits that this target can perform atomic
510 pub fn max_atomic_width(&self) -> u64 {
511 self.options.max_atomic_width.unwrap_or(self.target_pointer_width.parse().unwrap())
514 pub fn is_abi_supported(&self, abi: Abi) -> bool {
515 abi.generic() || !self.options.abi_blacklist.contains(&abi)
518 /// Load a target descriptor from a JSON object.
519 pub fn from_json(obj: Json) -> TargetResult {
520 // While ugly, this code must remain this way to retain
521 // compatibility with existing JSON fields and the internal
522 // expected naming of the Target and TargetOptions structs.
523 // To ensure compatibility is retained, the built-in targets
524 // are round-tripped through this code to catch cases where
525 // the JSON parser is not updated to match the structs.
527 let get_req_field = |name: &str| {
529 .map(|s| s.as_string())
530 .and_then(|os| os.map(|s| s.to_string())) {
531 Some(val) => Ok(val),
533 return Err(format!("Field {} in target specification is required", name))
538 let get_opt_field = |name: &str, default: &str| {
539 obj.find(name).and_then(|s| s.as_string())
540 .map(|s| s.to_string())
541 .unwrap_or(default.to_string())
544 let mut base = Target {
545 llvm_target: get_req_field("llvm-target")?,
546 target_endian: get_req_field("target-endian")?,
547 target_pointer_width: get_req_field("target-pointer-width")?,
548 data_layout: get_req_field("data-layout")?,
549 arch: get_req_field("arch")?,
550 target_os: get_req_field("os")?,
551 target_env: get_opt_field("env", ""),
552 target_vendor: get_opt_field("vendor", "unknown"),
553 linker_flavor: LinkerFlavor::from_str(&*get_req_field("linker-flavor")?)
555 format!("linker flavor must be {}", LinkerFlavor::one_of())
557 options: Default::default(),
561 ($key_name:ident) => ( {
562 let name = (stringify!($key_name)).replace("_", "-");
563 obj.find(&name[..]).map(|o| o.as_string()
564 .map(|s| base.options.$key_name = s.to_string()));
566 ($key_name:ident, bool) => ( {
567 let name = (stringify!($key_name)).replace("_", "-");
569 .map(|o| o.as_boolean()
570 .map(|s| base.options.$key_name = s));
572 ($key_name:ident, Option<u64>) => ( {
573 let name = (stringify!($key_name)).replace("_", "-");
576 .map(|s| base.options.$key_name = Some(s)));
578 ($key_name:ident, PanicStrategy) => ( {
579 let name = (stringify!($key_name)).replace("_", "-");
580 obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
582 "unwind" => base.options.$key_name = PanicStrategy::Unwind,
583 "abort" => base.options.$key_name = PanicStrategy::Abort,
584 _ => return Some(Err(format!("'{}' is not a valid value for \
585 panic-strategy. Use 'unwind' or 'abort'.",
589 })).unwrap_or(Ok(()))
591 ($key_name:ident, RelroLevel) => ( {
592 let name = (stringify!($key_name)).replace("_", "-");
593 obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
594 match s.parse::<RelroLevel>() {
595 Ok(level) => base.options.$key_name = level,
596 _ => return Some(Err(format!("'{}' is not a valid value for \
597 relro-level. Use 'full', 'partial, or 'off'.",
601 })).unwrap_or(Ok(()))
603 ($key_name:ident, list) => ( {
604 let name = (stringify!($key_name)).replace("_", "-");
605 obj.find(&name[..]).map(|o| o.as_array()
606 .map(|v| base.options.$key_name = v.iter()
607 .map(|a| a.as_string().unwrap().to_string()).collect()
611 ($key_name:ident, optional) => ( {
612 let name = (stringify!($key_name)).replace("_", "-");
613 if let Some(o) = obj.find(&name[..]) {
614 base.options.$key_name = o
616 .map(|s| s.to_string() );
619 ($key_name:ident, LinkerFlavor) => ( {
620 let name = (stringify!($key_name)).replace("_", "-");
621 obj.find(&name[..]).and_then(|o| o.as_string().map(|s| {
622 LinkerFlavor::from_str(&s).ok_or_else(|| {
623 Err(format!("'{}' is not a valid value for linker-flavor. \
624 Use 'em', 'gcc', 'ld' or 'msvc.", s))
626 })).unwrap_or(Ok(()))
628 ($key_name:ident, link_args) => ( {
629 let name = (stringify!($key_name)).replace("_", "-");
630 if let Some(obj) = obj.find(&name[..]).and_then(|o| o.as_object()) {
631 let mut args = LinkArgs::new();
633 let k = LinkerFlavor::from_str(&k).ok_or_else(|| {
634 format!("{}: '{}' is not a valid value for linker-flavor. \
635 Use 'em', 'gcc', 'ld' or 'msvc'", name, k)
638 let v = v.as_array().map(|a| {
641 .filter_map(|o| o.as_string())
642 .map(|s| s.to_owned())
644 }).unwrap_or(vec![]);
648 base.options.$key_name = args;
651 ($key_name:ident, env) => ( {
652 let name = (stringify!($key_name)).replace("_", "-");
653 if let Some(a) = obj.find(&name[..]).and_then(|o| o.as_array()) {
655 if let Some(s) = o.as_string() {
656 let p = s.split('=').collect::<Vec<_>>();
658 let k = p[0].to_string();
659 let v = p[1].to_string();
660 base.options.$key_name.push((k, v));
668 key!(is_builtin, bool);
671 key!(pre_link_args, link_args);
672 key!(pre_link_objects_exe, list);
673 key!(pre_link_objects_dll, list);
674 key!(late_link_args, link_args);
675 key!(post_link_objects, list);
676 key!(post_link_args, link_args);
678 key!(asm_args, list);
681 key!(dynamic_linking, bool);
682 key!(executables, bool);
683 key!(relocation_model);
685 key!(disable_redzone, bool);
686 key!(eliminate_frame_pointer, bool);
687 key!(function_sections, bool);
691 key!(staticlib_prefix);
692 key!(staticlib_suffix);
693 key!(target_family, optional);
694 key!(is_like_openbsd, bool);
695 key!(is_like_osx, bool);
696 key!(is_like_solaris, bool);
697 key!(is_like_windows, bool);
698 key!(is_like_msvc, bool);
699 key!(is_like_emscripten, bool);
700 key!(is_like_android, bool);
701 key!(linker_is_gnu, bool);
702 key!(allows_weak_linkage, bool);
703 key!(has_rpath, bool);
704 key!(no_default_libraries, bool);
705 key!(position_independent_executables, bool);
706 try!(key!(relro_level, RelroLevel));
707 key!(archive_format);
708 key!(allow_asm, bool);
709 key!(custom_unwind_resume, bool);
710 key!(exe_allocation_crate, optional);
711 key!(has_elf_tls, bool);
712 key!(obj_is_bitcode, bool);
713 key!(no_integrated_as, bool);
714 key!(max_atomic_width, Option<u64>);
715 key!(min_atomic_width, Option<u64>);
716 try!(key!(panic_strategy, PanicStrategy));
717 key!(crt_static_default, bool);
718 key!(stack_probes, bool);
720 if let Some(array) = obj.find("abi-blacklist").and_then(Json::as_array) {
721 for name in array.iter().filter_map(|abi| abi.as_string()) {
722 match lookup_abi(name) {
725 return Err(format!("The ABI \"{}\" is considered to be supported on \
726 all targets and cannot be blacklisted", abi))
729 base.options.abi_blacklist.push(abi)
731 None => return Err(format!("Unknown ABI \"{}\" in target specification", name))
739 /// Search RUST_TARGET_PATH for a JSON file specifying the given target
740 /// triple. Note that it could also just be a bare filename already, so also
741 /// check for that. If one of the hardcoded targets we know about, just
742 /// return it directly.
744 /// The error string could come from any of the APIs called, including
745 /// filesystem access and JSON decoding.
746 pub fn search(target: &str) -> Result<Target, String> {
748 use std::ffi::OsString;
750 use std::path::{Path, PathBuf};
753 fn load_file(path: &Path) -> Result<Target, String> {
754 let mut f = File::open(path).map_err(|e| e.to_string())?;
755 let mut contents = Vec::new();
756 f.read_to_end(&mut contents).map_err(|e| e.to_string())?;
757 let obj = json::from_reader(&mut &contents[..])
758 .map_err(|e| e.to_string())?;
759 Target::from_json(obj)
762 if let Ok(t) = load_specific(target) {
766 let path = Path::new(target);
769 return load_file(&path);
773 let mut target = target.to_string();
774 target.push_str(".json");
775 PathBuf::from(target)
778 let target_path = env::var_os("RUST_TARGET_PATH")
779 .unwrap_or(OsString::new());
781 // FIXME 16351: add a sane default search path?
783 for dir in env::split_paths(&target_path) {
784 let p = dir.join(&path);
786 return load_file(&p);
790 Err(format!("Could not find specification for target {:?}", target))
794 impl ToJson for Target {
795 fn to_json(&self) -> Json {
796 let mut d = BTreeMap::new();
797 let default: TargetOptions = Default::default();
799 macro_rules! target_val {
801 let name = (stringify!($attr)).replace("_", "-");
802 d.insert(name.to_string(), self.$attr.to_json());
804 ($attr:ident, $key_name:expr) => ( {
805 let name = $key_name;
806 d.insert(name.to_string(), self.$attr.to_json());
810 macro_rules! target_option_val {
812 let name = (stringify!($attr)).replace("_", "-");
813 if default.$attr != self.options.$attr {
814 d.insert(name.to_string(), self.options.$attr.to_json());
817 ($attr:ident, $key_name:expr) => ( {
818 let name = $key_name;
819 if default.$attr != self.options.$attr {
820 d.insert(name.to_string(), self.options.$attr.to_json());
823 (link_args - $attr:ident) => ( {
824 let name = (stringify!($attr)).replace("_", "-");
825 if default.$attr != self.options.$attr {
826 let obj = self.options.$attr
828 .map(|(k, v)| (k.desc().to_owned(), v.clone()))
829 .collect::<BTreeMap<_, _>>();
830 d.insert(name.to_string(), obj.to_json());
833 (env - $attr:ident) => ( {
834 let name = (stringify!($attr)).replace("_", "-");
835 if default.$attr != self.options.$attr {
836 let obj = self.options.$attr
838 .map(|&(ref k, ref v)| k.clone() + "=" + &v)
839 .collect::<Vec<_>>();
840 d.insert(name.to_string(), obj.to_json());
846 target_val!(llvm_target);
847 target_val!(target_endian);
848 target_val!(target_pointer_width);
850 target_val!(target_os, "os");
851 target_val!(target_env, "env");
852 target_val!(target_vendor, "vendor");
853 target_val!(data_layout);
854 target_val!(linker_flavor);
856 target_option_val!(is_builtin);
857 target_option_val!(linker);
858 target_option_val!(ar);
859 target_option_val!(link_args - pre_link_args);
860 target_option_val!(pre_link_objects_exe);
861 target_option_val!(pre_link_objects_dll);
862 target_option_val!(link_args - late_link_args);
863 target_option_val!(post_link_objects);
864 target_option_val!(link_args - post_link_args);
865 target_option_val!(env - link_env);
866 target_option_val!(asm_args);
867 target_option_val!(cpu);
868 target_option_val!(features);
869 target_option_val!(dynamic_linking);
870 target_option_val!(executables);
871 target_option_val!(relocation_model);
872 target_option_val!(code_model);
873 target_option_val!(disable_redzone);
874 target_option_val!(eliminate_frame_pointer);
875 target_option_val!(function_sections);
876 target_option_val!(dll_prefix);
877 target_option_val!(dll_suffix);
878 target_option_val!(exe_suffix);
879 target_option_val!(staticlib_prefix);
880 target_option_val!(staticlib_suffix);
881 target_option_val!(target_family);
882 target_option_val!(is_like_openbsd);
883 target_option_val!(is_like_osx);
884 target_option_val!(is_like_solaris);
885 target_option_val!(is_like_windows);
886 target_option_val!(is_like_msvc);
887 target_option_val!(is_like_emscripten);
888 target_option_val!(is_like_android);
889 target_option_val!(linker_is_gnu);
890 target_option_val!(allows_weak_linkage);
891 target_option_val!(has_rpath);
892 target_option_val!(no_default_libraries);
893 target_option_val!(position_independent_executables);
894 target_option_val!(relro_level);
895 target_option_val!(archive_format);
896 target_option_val!(allow_asm);
897 target_option_val!(custom_unwind_resume);
898 target_option_val!(exe_allocation_crate);
899 target_option_val!(has_elf_tls);
900 target_option_val!(obj_is_bitcode);
901 target_option_val!(no_integrated_as);
902 target_option_val!(min_atomic_width);
903 target_option_val!(max_atomic_width);
904 target_option_val!(panic_strategy);
905 target_option_val!(crt_static_default);
906 target_option_val!(stack_probes);
908 if default.abi_blacklist != self.options.abi_blacklist {
909 d.insert("abi-blacklist".to_string(), self.options.abi_blacklist.iter()
910 .map(Abi::name).map(|name| name.to_json())
911 .collect::<Vec<_>>().to_json());
918 fn maybe_jemalloc() -> Option<String> {
919 if cfg!(feature = "jemalloc") {
920 Some("alloc_jemalloc".to_string())