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
::*;
65 mod windows_msvc_base
;
67 pub type TargetResult
= Result
<Target
, String
>;
69 macro_rules
! supported_targets
{
70 ( $
(($triple
:expr
, $module
:ident
)),+ ) => (
73 /// List of supported targets
74 const TARGETS
: &'
static [&'
static str] = &[$
($triple
),*];
76 fn load_specific(target
: &str) -> TargetResult
{
80 let mut t
= try
!($module
::target());
81 t
.options
.is_builtin
= true;
83 // round-trip through the JSON parser to ensure at
84 // run-time that the parser works correctly
85 t
= try
!(Target
::from_json(t
.to_json()));
86 debug
!("Got builtin target: {:?}", t
);
90 _
=> Err(format
!("Unable to find target: {}", target
))
94 pub fn get_targets() -> Box
<Iterator
<Item
=String
>> {
95 Box
::new(TARGETS
.iter().filter_map(|t
| -> Option
<String
> {
97 .and(Ok(t
.to_string()))
103 mod test_json_encode_decode
{
104 use serialize
::json
::ToJson
;
106 $
(use super::$module
;)*
111 // Grab the TargetResult struct. If we successfully retrieved
112 // a Target, then the test JSON encoding/decoding can run for this
113 // Target on this testing platform (i.e., checking the iOS targets
114 // only on a Mac test platform).
115 let _
= $module
::target().map(|original
| {
116 let as_json
= original
.to_json();
117 let parsed
= Target
::from_json(as_json
).unwrap();
118 assert_eq
!(original
, parsed
);
127 ("x86_64-unknown-linux-gnu", x86_64_unknown_linux_gnu
),
128 ("i686-unknown-linux-gnu", i686_unknown_linux_gnu
),
129 ("i586-unknown-linux-gnu", i586_unknown_linux_gnu
),
130 ("mips-unknown-linux-gnu", mips_unknown_linux_gnu
),
131 ("mipsel-unknown-linux-gnu", mipsel_unknown_linux_gnu
),
132 ("powerpc-unknown-linux-gnu", powerpc_unknown_linux_gnu
),
133 ("powerpc64-unknown-linux-gnu", powerpc64_unknown_linux_gnu
),
134 ("powerpc64le-unknown-linux-gnu", powerpc64le_unknown_linux_gnu
),
135 ("arm-unknown-linux-gnueabi", arm_unknown_linux_gnueabi
),
136 ("arm-unknown-linux-gnueabihf", arm_unknown_linux_gnueabihf
),
137 ("arm-unknown-linux-musleabi", arm_unknown_linux_musleabi
),
138 ("arm-unknown-linux-musleabihf", arm_unknown_linux_musleabihf
),
139 ("armv7-unknown-linux-gnueabihf", armv7_unknown_linux_gnueabihf
),
140 ("armv7-unknown-linux-musleabihf", armv7_unknown_linux_musleabihf
),
141 ("aarch64-unknown-linux-gnu", aarch64_unknown_linux_gnu
),
142 ("x86_64-unknown-linux-musl", x86_64_unknown_linux_musl
),
143 ("i686-unknown-linux-musl", i686_unknown_linux_musl
),
144 ("mips-unknown-linux-musl", mips_unknown_linux_musl
),
145 ("mipsel-unknown-linux-musl", mipsel_unknown_linux_musl
),
147 ("i686-linux-android", i686_linux_android
),
148 ("arm-linux-androideabi", arm_linux_androideabi
),
149 ("armv7-linux-androideabi", armv7_linux_androideabi
),
150 ("aarch64-linux-android", aarch64_linux_android
),
152 ("i686-unknown-freebsd", i686_unknown_freebsd
),
153 ("x86_64-unknown-freebsd", x86_64_unknown_freebsd
),
155 ("i686-unknown-dragonfly", i686_unknown_dragonfly
),
156 ("x86_64-unknown-dragonfly", x86_64_unknown_dragonfly
),
158 ("x86_64-unknown-bitrig", x86_64_unknown_bitrig
),
159 ("x86_64-unknown-openbsd", x86_64_unknown_openbsd
),
160 ("x86_64-unknown-netbsd", x86_64_unknown_netbsd
),
161 ("x86_64-rumprun-netbsd", x86_64_rumprun_netbsd
),
163 ("x86_64-apple-darwin", x86_64_apple_darwin
),
164 ("i686-apple-darwin", i686_apple_darwin
),
166 ("i386-apple-ios", i386_apple_ios
),
167 ("x86_64-apple-ios", x86_64_apple_ios
),
168 ("aarch64-apple-ios", aarch64_apple_ios
),
169 ("armv7-apple-ios", armv7_apple_ios
),
170 ("armv7s-apple-ios", armv7s_apple_ios
),
172 ("x86_64-sun-solaris", x86_64_sun_solaris
),
174 ("x86_64-pc-windows-gnu", x86_64_pc_windows_gnu
),
175 ("i686-pc-windows-gnu", i686_pc_windows_gnu
),
177 ("x86_64-pc-windows-msvc", x86_64_pc_windows_msvc
),
178 ("i686-pc-windows-msvc", i686_pc_windows_msvc
),
179 ("i586-pc-windows-msvc", i586_pc_windows_msvc
),
181 ("le32-unknown-nacl", le32_unknown_nacl
),
182 ("asmjs-unknown-emscripten", asmjs_unknown_emscripten
)
185 /// Everything `rustc` knows about how to compile for a specific target.
187 /// Every field here must be specified, and has no default value.
188 #[derive(PartialEq, Clone, Debug)]
190 /// Target triple to pass to LLVM.
191 pub llvm_target
: String
,
192 /// String to use as the `target_endian` `cfg` variable.
193 pub target_endian
: String
,
194 /// String to use as the `target_pointer_width` `cfg` variable.
195 pub target_pointer_width
: String
,
196 /// OS name to use for conditional compilation.
197 pub target_os
: String
,
198 /// Environment name to use for conditional compilation.
199 pub target_env
: String
,
200 /// Vendor name to use for conditional compilation.
201 pub target_vendor
: String
,
202 /// Architecture to use for ABI considerations. Valid options: "x86",
203 /// "x86_64", "arm", "aarch64", "mips", "powerpc", and "powerpc64".
205 /// [Data layout](http://llvm.org/docs/LangRef.html#data-layout) to pass to LLVM.
206 pub data_layout
: String
,
207 /// Optional settings with defaults.
208 pub options
: TargetOptions
,
211 /// Optional aspects of a target specification.
213 /// This has an implementation of `Default`, see each field for what the default is. In general,
214 /// these try to take "minimal defaults" that don't assume anything about the runtime they run in.
215 #[derive(PartialEq, Clone, Debug)]
216 pub struct TargetOptions
{
217 /// Whether the target is built-in or loaded from a custom target specification.
218 pub is_builtin
: bool
,
220 /// Linker to invoke. Defaults to "cc".
222 /// Archive utility to use when managing archives. Defaults to "ar".
225 /// Linker arguments that are unconditionally passed *before* any
226 /// user-defined libraries.
227 pub pre_link_args
: Vec
<String
>,
228 /// Objects to link before all others, always found within the
230 pub pre_link_objects_exe
: Vec
<String
>, // ... when linking an executable
231 pub pre_link_objects_dll
: Vec
<String
>, // ... when linking a dylib
232 /// Linker arguments that are unconditionally passed after any
233 /// user-defined but before post_link_objects. Standard platform
234 /// libraries that should be always be linked to, usually go here.
235 pub late_link_args
: Vec
<String
>,
236 /// Objects to link after all others, always found within the
238 pub post_link_objects
: Vec
<String
>,
239 /// Linker arguments that are unconditionally passed *after* any
240 /// user-defined libraries.
241 pub post_link_args
: Vec
<String
>,
243 /// Default CPU to pass to LLVM. Corresponds to `llc -mcpu=$cpu`. Defaults
246 /// Default target features to pass to LLVM. These features will *always* be
247 /// passed, and cannot be disabled even via `-C`. Corresponds to `llc
248 /// -mattr=$features`.
249 pub features
: String
,
250 /// Whether dynamic linking is available on this target. Defaults to false.
251 pub dynamic_linking
: bool
,
252 /// Whether executables are available on this target. iOS, for example, only allows static
253 /// libraries. Defaults to false.
254 pub executables
: bool
,
255 /// Relocation model to use in object file. Corresponds to `llc
256 /// -relocation-model=$relocation_model`. Defaults to "pic".
257 pub relocation_model
: String
,
258 /// Code model to use. Corresponds to `llc -code-model=$code_model`. Defaults to "default".
259 pub code_model
: String
,
260 /// Do not emit code that uses the "red zone", if the ABI has one. Defaults to false.
261 pub disable_redzone
: bool
,
262 /// Eliminate frame pointers from stack frames if possible. Defaults to true.
263 pub eliminate_frame_pointer
: bool
,
264 /// Emit each function in its own section. Defaults to true.
265 pub function_sections
: bool
,
266 /// String to prepend to the name of every dynamic library. Defaults to "lib".
267 pub dll_prefix
: String
,
268 /// String to append to the name of every dynamic library. Defaults to ".so".
269 pub dll_suffix
: String
,
270 /// String to append to the name of every executable.
271 pub exe_suffix
: String
,
272 /// String to prepend to the name of every static library. Defaults to "lib".
273 pub staticlib_prefix
: String
,
274 /// String to append to the name of every static library. Defaults to ".a".
275 pub staticlib_suffix
: String
,
276 /// OS family to use for conditional compilation. Valid options: "unix", "windows".
277 pub target_family
: Option
<String
>,
278 /// Whether the target toolchain is like OSX's. Only useful for compiling against iOS/OS X, in
279 /// particular running dsymutil and some other stuff like `-dead_strip`. Defaults to false.
280 pub is_like_osx
: bool
,
281 /// Whether the target toolchain is like Solaris's.
282 /// Only useful for compiling against Illumos/Solaris,
283 /// as they have a different set of linker flags. Defaults to false.
284 pub is_like_solaris
: bool
,
285 /// Whether the target toolchain is like Windows'. Only useful for compiling against Windows,
286 /// only really used for figuring out how to find libraries, since Windows uses its own
287 /// library naming convention. Defaults to false.
288 pub is_like_windows
: bool
,
289 pub is_like_msvc
: bool
,
290 /// Whether the target toolchain is like Android's. Only useful for compiling against Android.
291 /// Defaults to false.
292 pub is_like_android
: bool
,
293 /// Whether the linker support GNU-like arguments such as -O. Defaults to false.
294 pub linker_is_gnu
: bool
,
295 /// The MinGW toolchain has a known issue that prevents it from correctly
296 /// handling COFF object files with more than 2^15 sections. Since each weak
297 /// symbol needs its own COMDAT section, weak linkage implies a large
298 /// number sections that easily exceeds the given limit for larger
299 /// codebases. Consequently we want a way to disallow weak linkage on some
301 pub allows_weak_linkage
: bool
,
302 /// Whether the linker support rpaths or not. Defaults to false.
304 /// Whether to disable linking to compiler-rt. Defaults to false, as LLVM
305 /// will emit references to the functions that compiler-rt provides.
306 pub no_compiler_rt
: bool
,
307 /// Whether to disable linking to the default libraries, typically corresponds
308 /// to `-nodefaultlibs`. Defaults to true.
309 pub no_default_libraries
: bool
,
310 /// Dynamically linked executables can be compiled as position independent
311 /// if the default relocation model of position independent code is not
312 /// changed. This is a requirement to take advantage of ASLR, as otherwise
313 /// the functions in the executable are not randomized and can be used
314 /// during an exploit of a vulnerability in any code.
315 pub position_independent_executables
: bool
,
316 /// Format that archives should be emitted in. This affects whether we use
317 /// LLVM to assemble an archive or fall back to the system linker, and
318 /// currently only "gnu" is used to fall into LLVM. Unknown strings cause
319 /// the system linker to be used.
320 pub archive_format
: String
,
321 /// Is asm!() allowed? Defaults to true.
323 /// Whether the target uses a custom unwind resumption routine.
324 /// By default LLVM lowers `resume` instructions into calls to `_Unwind_Resume`
325 /// defined in libgcc. If this option is enabled, the target must provide
326 /// `eh_unwind_resume` lang item.
327 pub custom_unwind_resume
: bool
,
329 /// Default crate for allocation symbols to link against
330 pub lib_allocation_crate
: String
,
331 pub exe_allocation_crate
: String
,
333 /// Flag indicating whether ELF TLS (e.g. #[thread_local]) is available for
335 pub has_elf_tls
: bool
,
336 // This is mainly for easy compatibility with emscripten.
337 // If we give emcc .o files that are actually .bc files it
339 pub obj_is_bitcode
: bool
,
341 /// Maximum integer size in bits that this target can perform atomic
343 pub max_atomic_width
: u64,
346 impl Default
for TargetOptions
{
347 /// Create a set of "sane defaults" for any target. This is still
348 /// incomplete, and if used for compilation, will certainly not work.
349 fn default() -> TargetOptions
{
352 linker
: option_env
!("CFG_DEFAULT_LINKER").unwrap_or("cc").to_string(),
353 ar
: option_env
!("CFG_DEFAULT_AR").unwrap_or("ar").to_string(),
354 pre_link_args
: Vec
::new(),
355 post_link_args
: Vec
::new(),
356 cpu
: "generic".to_string(),
357 features
: "".to_string(),
358 dynamic_linking
: false,
360 relocation_model
: "pic".to_string(),
361 code_model
: "default".to_string(),
362 disable_redzone
: false,
363 eliminate_frame_pointer
: true,
364 function_sections
: true,
365 dll_prefix
: "lib".to_string(),
366 dll_suffix
: ".so".to_string(),
367 exe_suffix
: "".to_string(),
368 staticlib_prefix
: "lib".to_string(),
369 staticlib_suffix
: ".a".to_string(),
372 is_like_solaris
: false,
373 is_like_windows
: false,
374 is_like_android
: false,
376 linker_is_gnu
: false,
377 allows_weak_linkage
: true,
379 no_compiler_rt
: false,
380 no_default_libraries
: true,
381 position_independent_executables
: false,
382 pre_link_objects_exe
: Vec
::new(),
383 pre_link_objects_dll
: Vec
::new(),
384 post_link_objects
: Vec
::new(),
385 late_link_args
: Vec
::new(),
386 archive_format
: "gnu".to_string(),
387 custom_unwind_resume
: false,
388 lib_allocation_crate
: "alloc_system".to_string(),
389 exe_allocation_crate
: "alloc_system".to_string(),
392 obj_is_bitcode
: false,
399 /// Given a function ABI, turn "System" into the correct ABI for this target.
400 pub fn adjust_abi(&self, abi
: Abi
) -> Abi
{
403 if self.options
.is_like_windows
&& self.arch
== "x86" {
413 /// Load a target descriptor from a JSON object.
414 pub fn from_json(obj
: Json
) -> TargetResult
{
415 // While ugly, this code must remain this way to retain
416 // compatibility with existing JSON fields and the internal
417 // expected naming of the Target and TargetOptions structs.
418 // To ensure compatibility is retained, the built-in targets
419 // are round-tripped through this code to catch cases where
420 // the JSON parser is not updated to match the structs.
422 let get_req_field
= |name
: &str| {
424 .map(|s
| s
.as_string())
425 .and_then(|os
| os
.map(|s
| s
.to_string())) {
426 Some(val
) => Ok(val
),
428 return Err(format
!("Field {} in target specification is required", name
))
433 let get_opt_field
= |name
: &str, default: &str| {
434 obj
.find(name
).and_then(|s
| s
.as_string())
435 .map(|s
| s
.to_string())
436 .unwrap_or(default.to_string())
439 let mut base
= Target
{
440 llvm_target
: try
!(get_req_field("llvm-target")),
441 target_endian
: try
!(get_req_field("target-endian")),
442 target_pointer_width
: try
!(get_req_field("target-pointer-width")),
443 data_layout
: try
!(get_req_field("data-layout")),
444 arch
: try
!(get_req_field("arch")),
445 target_os
: try
!(get_req_field("os")),
446 target_env
: get_opt_field("env", ""),
447 target_vendor
: get_opt_field("vendor", "unknown"),
448 options
: Default
::default(),
451 // Default max-atomic-width to target-pointer-width
452 base
.options
.max_atomic_width
= base
.target_pointer_width
.parse().unwrap();
455 ($key_name
:ident
) => ( {
456 let name
= (stringify
!($key_name
)).replace("_", "-");
457 obj
.find(&name
[..]).map(|o
| o
.as_string()
458 .map(|s
| base
.options
.$key_name
= s
.to_string()));
460 ($key_name
:ident
, bool
) => ( {
461 let name
= (stringify
!($key_name
)).replace("_", "-");
463 .map(|o
| o
.as_boolean()
464 .map(|s
| base
.options
.$key_name
= s
));
466 ($key_name
:ident
, u64) => ( {
467 let name
= (stringify
!($key_name
)).replace("_", "-");
470 .map(|s
| base
.options
.$key_name
= s
));
472 ($key_name
:ident
, list
) => ( {
473 let name
= (stringify
!($key_name
)).replace("_", "-");
474 obj
.find(&name
[..]).map(|o
| o
.as_array()
475 .map(|v
| base
.options
.$key_name
= v
.iter()
476 .map(|a
| a
.as_string().unwrap().to_string()).collect()
480 ($key_name
:ident
, optional
) => ( {
481 let name
= (stringify
!($key_name
)).replace("_", "-");
482 if let Some(o
) = obj
.find(&name
[..]) {
483 base
.options
.$key_name
= o
485 .map(|s
| s
.to_string() );
490 key
!(is_builtin
, bool
);
493 key
!(pre_link_args
, list
);
494 key
!(pre_link_objects_exe
, list
);
495 key
!(pre_link_objects_dll
, list
);
496 key
!(late_link_args
, list
);
497 key
!(post_link_objects
, list
);
498 key
!(post_link_args
, list
);
501 key
!(dynamic_linking
, bool
);
502 key
!(executables
, bool
);
503 key
!(relocation_model
);
505 key
!(disable_redzone
, bool
);
506 key
!(eliminate_frame_pointer
, bool
);
507 key
!(function_sections
, bool
);
511 key
!(staticlib_prefix
);
512 key
!(staticlib_suffix
);
513 key
!(target_family
, optional
);
514 key
!(is_like_osx
, bool
);
515 key
!(is_like_solaris
, bool
);
516 key
!(is_like_windows
, bool
);
517 key
!(is_like_msvc
, bool
);
518 key
!(is_like_android
, bool
);
519 key
!(linker_is_gnu
, bool
);
520 key
!(allows_weak_linkage
, bool
);
521 key
!(has_rpath
, bool
);
522 key
!(no_compiler_rt
, bool
);
523 key
!(no_default_libraries
, bool
);
524 key
!(position_independent_executables
, bool
);
525 key
!(archive_format
);
526 key
!(allow_asm
, bool
);
527 key
!(custom_unwind_resume
, bool
);
528 key
!(lib_allocation_crate
);
529 key
!(exe_allocation_crate
);
530 key
!(has_elf_tls
, bool
);
531 key
!(obj_is_bitcode
, bool
);
532 key
!(max_atomic_width
, u64);
537 /// Search RUST_TARGET_PATH for a JSON file specifying the given target
538 /// triple. Note that it could also just be a bare filename already, so also
539 /// check for that. If one of the hardcoded targets we know about, just
540 /// return it directly.
542 /// The error string could come from any of the APIs called, including
543 /// filesystem access and JSON decoding.
544 pub fn search(target
: &str) -> Result
<Target
, String
> {
546 use std
::ffi
::OsString
;
548 use std
::path
::{Path, PathBuf}
;
551 fn load_file(path
: &Path
) -> Result
<Target
, String
> {
552 let mut f
= File
::open(path
).map_err(|e
| e
.to_string())?
;
553 let mut contents
= Vec
::new();
554 f
.read_to_end(&mut contents
).map_err(|e
| e
.to_string())?
;
555 let obj
= json
::from_reader(&mut &contents
[..])
556 .map_err(|e
| e
.to_string())?
;
557 Target
::from_json(obj
)
560 if let Ok(t
) = load_specific(target
) {
564 let path
= Path
::new(target
);
567 return load_file(&path
);
571 let mut target
= target
.to_string();
572 target
.push_str(".json");
573 PathBuf
::from(target
)
576 let target_path
= env
::var_os("RUST_TARGET_PATH")
577 .unwrap_or(OsString
::new());
579 // FIXME 16351: add a sane default search path?
581 for dir
in env
::split_paths(&target_path
) {
582 let p
= dir
.join(&path
);
584 return load_file(&p
);
588 Err(format
!("Could not find specification for target {:?}", target
))
592 impl ToJson
for Target
{
593 fn to_json(&self) -> Json
{
594 let mut d
= BTreeMap
::new();
595 let default: TargetOptions
= Default
::default();
597 macro_rules
! target_val
{
599 let name
= (stringify
!($attr
)).replace("_", "-");
600 d
.insert(name
.to_string(), self.$attr
.to_json());
602 ($attr
:ident
, $key_name
:expr
) => ( {
603 let name
= $key_name
;
604 d
.insert(name
.to_string(), self.$attr
.to_json());
608 macro_rules
! target_option_val
{
610 let name
= (stringify
!($attr
)).replace("_", "-");
611 if default.$attr
!= self.options
.$attr
{
612 d
.insert(name
.to_string(), self.options
.$attr
.to_json());
615 ($attr
:ident
, $key_name
:expr
) => ( {
616 let name
= $key_name
;
617 if default.$attr
!= self.options
.$attr
{
618 d
.insert(name
.to_string(), self.options
.$attr
.to_json());
623 target_val
!(llvm_target
);
624 target_val
!(target_endian
);
625 target_val
!(target_pointer_width
);
627 target_val
!(target_os
, "os");
628 target_val
!(target_env
, "env");
629 target_val
!(target_vendor
, "vendor");
631 target_val
!(data_layout
);
633 target_option_val
!(is_builtin
);
634 target_option_val
!(linker
);
635 target_option_val
!(ar
);
636 target_option_val
!(pre_link_args
);
637 target_option_val
!(pre_link_objects_exe
);
638 target_option_val
!(pre_link_objects_dll
);
639 target_option_val
!(late_link_args
);
640 target_option_val
!(post_link_objects
);
641 target_option_val
!(post_link_args
);
642 target_option_val
!(cpu
);
643 target_option_val
!(features
);
644 target_option_val
!(dynamic_linking
);
645 target_option_val
!(executables
);
646 target_option_val
!(relocation_model
);
647 target_option_val
!(code_model
);
648 target_option_val
!(disable_redzone
);
649 target_option_val
!(eliminate_frame_pointer
);
650 target_option_val
!(function_sections
);
651 target_option_val
!(dll_prefix
);
652 target_option_val
!(dll_suffix
);
653 target_option_val
!(exe_suffix
);
654 target_option_val
!(staticlib_prefix
);
655 target_option_val
!(staticlib_suffix
);
656 target_option_val
!(target_family
);
657 target_option_val
!(is_like_osx
);
658 target_option_val
!(is_like_solaris
);
659 target_option_val
!(is_like_windows
);
660 target_option_val
!(is_like_msvc
);
661 target_option_val
!(is_like_android
);
662 target_option_val
!(linker_is_gnu
);
663 target_option_val
!(allows_weak_linkage
);
664 target_option_val
!(has_rpath
);
665 target_option_val
!(no_compiler_rt
);
666 target_option_val
!(no_default_libraries
);
667 target_option_val
!(position_independent_executables
);
668 target_option_val
!(archive_format
);
669 target_option_val
!(allow_asm
);
670 target_option_val
!(custom_unwind_resume
);
671 target_option_val
!(lib_allocation_crate
);
672 target_option_val
!(exe_allocation_crate
);
673 target_option_val
!(has_elf_tls
);
674 target_option_val
!(obj_is_bitcode
);
675 target_option_val
!(max_atomic_width
);
681 fn maybe_jemalloc() -> String
{
682 if cfg
!(feature
= "jemalloc") {
683 "alloc_jemalloc".to_string()
685 "alloc_system".to_string()