1 //! Serialized configuration of a build.
3 //! This module implements parsing `config.toml` configuration files to tweak
4 //! how the build runs.
7 use std::collections::{HashMap, HashSet};
9 use std::ffi::OsString;
11 use std::path::{Path, PathBuf};
14 use crate::cache::{Interned, INTERNER};
15 use crate::flags::Flags;
16 pub use crate::flags::Subcommand;
18 use serde::Deserialize;
21 /// Global configuration for the entire build and/or bootstrap.
23 /// This structure is derived from a combination of both `config.toml` and
24 /// `config.mk`. As of the time of this writing it's unlikely that `config.toml`
25 /// is used all that much, so this is primarily filled out by `config.mk` which
26 /// is generated from `./configure`.
28 /// Note that this structure is not decoded directly into, but rather it is
29 /// filled out from the decoded forms of the structs below. For documentation
30 /// each field, see the corresponding fields in
31 /// `config.toml.example`.
34 pub ccache: Option<String>,
38 pub fast_submodules: bool,
39 pub compiler_docs: bool,
41 pub locked_deps: bool,
43 pub target_config: HashMap<Interned<String>, Target>,
44 pub full_bootstrap: bool,
46 pub tools: Option<HashSet<String>>,
50 pub exclude: Vec<PathBuf>,
51 pub rustc_error_format: Option<String>,
52 pub test_compare_mode: bool,
53 pub llvm_libunwind: bool,
55 pub skip_only_host_steps: bool,
57 pub on_fail: Option<String>,
58 pub stage: Option<u32>,
59 pub keep_stage: Vec<u32>,
61 pub jobs: Option<u32>,
63 pub incremental: bool,
66 pub deny_warnings: bool,
67 pub backtrace_on_ice: bool,
69 // llvm codegen options
70 pub llvm_skip_rebuild: bool,
71 pub llvm_assertions: bool,
72 pub llvm_optimize: bool,
73 pub llvm_thin_lto: bool,
74 pub llvm_release_debuginfo: bool,
75 pub llvm_version_check: bool,
76 pub llvm_static_stdcpp: bool,
77 pub llvm_link_shared: bool,
78 pub llvm_clang_cl: Option<String>,
79 pub llvm_targets: Option<String>,
80 pub llvm_experimental_targets: Option<String>,
81 pub llvm_link_jobs: Option<u32>,
82 pub llvm_version_suffix: Option<String>,
83 pub llvm_use_linker: Option<String>,
84 pub llvm_allow_old_toolchain: Option<bool>,
86 pub lld_enabled: bool,
87 pub lldb_enabled: bool,
88 pub llvm_tools_enabled: bool,
90 pub llvm_cflags: Option<String>,
91 pub llvm_cxxflags: Option<String>,
92 pub llvm_ldflags: Option<String>,
93 pub llvm_use_libcxx: bool,
95 // rust codegen options
96 pub rust_optimize: bool,
97 pub rust_codegen_units: Option<u32>,
98 pub rust_codegen_units_std: Option<u32>,
99 pub rust_debug_assertions: bool,
100 pub rust_debuginfo_level_rustc: u32,
101 pub rust_debuginfo_level_std: u32,
102 pub rust_debuginfo_level_tools: u32,
103 pub rust_debuginfo_level_tests: u32,
104 pub rust_rpath: bool,
105 pub rustc_parallel: bool,
106 pub rustc_default_linker: Option<String>,
107 pub rust_optimize_tests: bool,
108 pub rust_dist_src: bool,
109 pub rust_codegen_backends: Vec<Interned<String>>,
110 pub rust_verify_llvm_ir: bool,
111 pub rust_thin_lto_import_instr_limit: Option<u32>,
112 pub rust_remap_debuginfo: bool,
114 pub build: Interned<String>,
115 pub hosts: Vec<Interned<String>>,
116 pub targets: Vec<Interned<String>>,
117 pub local_rebuild: bool,
121 pub dist_sign_folder: Option<PathBuf>,
122 pub dist_upload_addr: Option<String>,
123 pub dist_gpg_password_file: Option<PathBuf>,
126 pub backtrace: bool, // support for RUST_BACKTRACE
129 pub low_priority: bool,
131 pub verbose_tests: bool,
132 pub save_toolstates: Option<PathBuf>,
133 pub print_step_timings: bool,
134 pub missing_tools: bool,
136 // Fallback musl-root for all targets
137 pub musl_root: Option<PathBuf>,
138 pub prefix: Option<PathBuf>,
139 pub sysconfdir: Option<PathBuf>,
140 pub datadir: Option<PathBuf>,
141 pub docdir: Option<PathBuf>,
143 pub libdir: Option<PathBuf>,
144 pub mandir: Option<PathBuf>,
145 pub codegen_tests: bool,
146 pub nodejs: Option<PathBuf>,
147 pub gdb: Option<PathBuf>,
148 pub python: Option<PathBuf>,
149 pub cargo_native_static: bool,
150 pub configure_args: Vec<String>,
152 // These are either the stage0 downloaded binaries or the locally installed ones.
153 pub initial_cargo: PathBuf,
154 pub initial_rustc: PathBuf,
155 pub initial_rustfmt: Option<PathBuf>,
159 /// Per-target configuration stored in the global configuration structure.
162 /// Some(path to llvm-config) if using an external LLVM.
163 pub llvm_config: Option<PathBuf>,
164 /// Some(path to FileCheck) if one was specified.
165 pub llvm_filecheck: Option<PathBuf>,
166 pub cc: Option<PathBuf>,
167 pub cxx: Option<PathBuf>,
168 pub ar: Option<PathBuf>,
169 pub ranlib: Option<PathBuf>,
170 pub linker: Option<PathBuf>,
171 pub ndk: Option<PathBuf>,
172 pub crt_static: Option<bool>,
173 pub musl_root: Option<PathBuf>,
174 pub wasi_root: Option<PathBuf>,
175 pub qemu_rootfs: Option<PathBuf>,
179 /// Structure of the `config.toml` file that configuration is read from.
181 /// This structure uses `Decodable` to automatically decode a TOML configuration
182 /// file into this format, and then this is traversed and written into the above
183 /// `Config` structure.
184 #[derive(Deserialize, Default)]
185 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
187 build: Option<Build>,
188 install: Option<Install>,
191 target: Option<HashMap<String, TomlTarget>>,
195 /// TOML representation of various global build decisions.
196 #[derive(Deserialize, Default, Clone)]
197 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
199 build: Option<String>,
204 cargo: Option<String>,
205 rustc: Option<String>,
206 rustfmt: Option<String>, /* allow bootstrap.py to use rustfmt key */
208 compiler_docs: Option<bool>,
209 submodules: Option<bool>,
210 fast_submodules: Option<bool>,
212 nodejs: Option<String>,
213 python: Option<String>,
214 locked_deps: Option<bool>,
215 vendor: Option<bool>,
216 full_bootstrap: Option<bool>,
217 extended: Option<bool>,
218 tools: Option<HashSet<String>>,
219 verbose: Option<usize>,
220 sanitizers: Option<bool>,
221 profiler: Option<bool>,
222 cargo_native_static: Option<bool>,
223 low_priority: Option<bool>,
224 configure_args: Option<Vec<String>>,
225 local_rebuild: Option<bool>,
226 print_step_timings: Option<bool>,
229 /// TOML representation of various global install decisions.
230 #[derive(Deserialize, Default, Clone)]
231 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
233 prefix: Option<String>,
234 sysconfdir: Option<String>,
235 docdir: Option<String>,
236 bindir: Option<String>,
237 libdir: Option<String>,
238 mandir: Option<String>,
239 datadir: Option<String>,
241 // standard paths, currently unused
242 infodir: Option<String>,
243 localstatedir: Option<String>,
246 /// TOML representation of how the LLVM build is configured.
247 #[derive(Deserialize, Default)]
248 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
250 skip_rebuild: Option<bool>,
251 optimize: Option<bool>,
252 thin_lto: Option<bool>,
253 release_debuginfo: Option<bool>,
254 assertions: Option<bool>,
255 ccache: Option<StringOrBool>,
256 version_check: Option<bool>,
257 static_libstdcpp: Option<bool>,
259 targets: Option<String>,
260 experimental_targets: Option<String>,
261 link_jobs: Option<u32>,
262 link_shared: Option<bool>,
263 version_suffix: Option<String>,
264 clang_cl: Option<String>,
265 cflags: Option<String>,
266 cxxflags: Option<String>,
267 ldflags: Option<String>,
268 use_libcxx: Option<bool>,
269 use_linker: Option<String>,
270 allow_old_toolchain: Option<bool>,
273 #[derive(Deserialize, Default, Clone)]
274 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
276 sign_folder: Option<String>,
277 gpg_password_file: Option<String>,
278 upload_addr: Option<String>,
279 src_tarball: Option<bool>,
280 missing_tools: Option<bool>,
283 #[derive(Deserialize)]
290 impl Default for StringOrBool {
291 fn default() -> StringOrBool {
292 StringOrBool::Bool(false)
296 /// TOML representation of how the Rust build is configured.
297 #[derive(Deserialize, Default)]
298 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
300 optimize: Option<bool>,
302 codegen_units: Option<u32>,
303 codegen_units_std: Option<u32>,
304 debug_assertions: Option<bool>,
305 debuginfo_level: Option<u32>,
306 debuginfo_level_rustc: Option<u32>,
307 debuginfo_level_std: Option<u32>,
308 debuginfo_level_tools: Option<u32>,
309 debuginfo_level_tests: Option<u32>,
310 backtrace: Option<bool>,
311 incremental: Option<bool>,
312 parallel_compiler: Option<bool>,
313 default_linker: Option<String>,
314 channel: Option<String>,
315 musl_root: Option<String>,
317 verbose_tests: Option<bool>,
318 optimize_tests: Option<bool>,
319 codegen_tests: Option<bool>,
320 ignore_git: Option<bool>,
321 dist_src: Option<bool>,
322 save_toolstates: Option<String>,
323 codegen_backends: Option<Vec<String>>,
325 llvm_tools: Option<bool>,
327 deny_warnings: Option<bool>,
328 backtrace_on_ice: Option<bool>,
329 verify_llvm_ir: Option<bool>,
330 thin_lto_import_instr_limit: Option<u32>,
331 remap_debuginfo: Option<bool>,
332 jemalloc: Option<bool>,
333 test_compare_mode: Option<bool>,
334 llvm_libunwind: Option<bool>,
337 /// TOML representation of how each build target is configured.
338 #[derive(Deserialize, Default)]
339 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
344 ranlib: Option<String>,
345 linker: Option<String>,
346 llvm_config: Option<String>,
347 llvm_filecheck: Option<String>,
348 android_ndk: Option<String>,
349 crt_static: Option<bool>,
350 musl_root: Option<String>,
351 wasi_root: Option<String>,
352 qemu_rootfs: Option<String>,
356 fn path_from_python(var_key: &str) -> PathBuf {
357 match env::var_os(var_key) {
358 Some(var_val) => Self::normalize_python_path(var_val),
359 _ => panic!("expected '{}' to be set", var_key),
363 /// Normalizes paths from Python slightly. We don't trust paths from Python (#49785).
364 fn normalize_python_path(path: OsString) -> PathBuf {
365 Path::new(&path).components().collect()
368 pub fn default_opts() -> Config {
369 let mut config = Config::default();
370 config.llvm_optimize = true;
371 config.llvm_version_check = true;
372 config.backtrace = true;
373 config.rust_optimize = true;
374 config.rust_optimize_tests = true;
375 config.submodules = true;
376 config.fast_submodules = true;
378 config.rust_rpath = true;
379 config.channel = "dev".to_string();
380 config.codegen_tests = true;
381 config.ignore_git = false;
382 config.rust_dist_src = true;
383 config.rust_codegen_backends = vec![INTERNER.intern_str("llvm")];
384 config.deny_warnings = true;
385 config.missing_tools = false;
387 // set by bootstrap.py
388 config.build = INTERNER.intern_str(&env::var("BUILD").expect("'BUILD' to be set"));
389 config.src = Config::path_from_python("SRC");
390 config.out = Config::path_from_python("BUILD_DIR");
392 config.initial_rustc = Config::path_from_python("RUSTC");
393 config.initial_cargo = Config::path_from_python("CARGO");
394 config.initial_rustfmt = env::var_os("RUSTFMT").map(Config::normalize_python_path);
399 pub fn parse(args: &[String]) -> Config {
400 let flags = Flags::parse(&args);
401 let file = flags.config.clone();
402 let mut config = Config::default_opts();
403 config.exclude = flags.exclude;
404 config.rustc_error_format = flags.rustc_error_format;
405 config.on_fail = flags.on_fail;
406 config.stage = flags.stage;
407 config.jobs = flags.jobs.map(threads_from_config);
408 config.cmd = flags.cmd;
409 config.incremental = flags.incremental;
410 config.dry_run = flags.dry_run;
411 config.keep_stage = flags.keep_stage;
412 config.bindir = "bin".into(); // default
413 if let Some(value) = flags.deny_warnings {
414 config.deny_warnings = value;
418 let dir = config.out.join("tmp-dry-run");
419 t!(fs::create_dir_all(&dir));
423 // If --target was specified but --host wasn't specified, don't run any host-only tests.
424 let has_hosts = !flags.host.is_empty();
425 let has_targets = !flags.target.is_empty();
426 config.skip_only_host_steps = !has_hosts && has_targets;
430 let contents = t!(fs::read_to_string(&file));
431 match toml::from_str(&contents) {
435 "failed to parse TOML configuration '{}': {}",
443 .unwrap_or_else(|| TomlConfig::default());
445 let build = toml.build.clone().unwrap_or_default();
446 // set by bootstrap.py
447 config.hosts.push(config.build.clone());
448 for host in build.host.iter() {
449 let host = INTERNER.intern_str(host);
450 if !config.hosts.contains(&host) {
451 config.hosts.push(host);
455 config.hosts.iter().cloned().chain(build.target.iter().map(|s| INTERNER.intern_str(s)))
457 if !config.targets.contains(&target) {
458 config.targets.push(target);
461 config.hosts = if !flags.host.is_empty() { flags.host } else { config.hosts };
462 config.targets = if !flags.target.is_empty() { flags.target } else { config.targets };
464 config.nodejs = build.nodejs.map(PathBuf::from);
465 config.gdb = build.gdb.map(PathBuf::from);
466 config.python = build.python.map(PathBuf::from);
467 set(&mut config.low_priority, build.low_priority);
468 set(&mut config.compiler_docs, build.compiler_docs);
469 set(&mut config.docs, build.docs);
470 set(&mut config.submodules, build.submodules);
471 set(&mut config.fast_submodules, build.fast_submodules);
472 set(&mut config.locked_deps, build.locked_deps);
473 set(&mut config.vendor, build.vendor);
474 set(&mut config.full_bootstrap, build.full_bootstrap);
475 set(&mut config.extended, build.extended);
476 config.tools = build.tools;
477 set(&mut config.verbose, build.verbose);
478 set(&mut config.sanitizers, build.sanitizers);
479 set(&mut config.profiler, build.profiler);
480 set(&mut config.cargo_native_static, build.cargo_native_static);
481 set(&mut config.configure_args, build.configure_args);
482 set(&mut config.local_rebuild, build.local_rebuild);
483 set(&mut config.print_step_timings, build.print_step_timings);
484 config.verbose = cmp::max(config.verbose, flags.verbose);
486 if let Some(ref install) = toml.install {
487 config.prefix = install.prefix.clone().map(PathBuf::from);
488 config.sysconfdir = install.sysconfdir.clone().map(PathBuf::from);
489 config.datadir = install.datadir.clone().map(PathBuf::from);
490 config.docdir = install.docdir.clone().map(PathBuf::from);
491 set(&mut config.bindir, install.bindir.clone().map(PathBuf::from));
492 config.libdir = install.libdir.clone().map(PathBuf::from);
493 config.mandir = install.mandir.clone().map(PathBuf::from);
496 // We want the llvm-skip-rebuild flag to take precedence over the
497 // skip-rebuild config.toml option so we store it separately
498 // so that we can infer the right value
499 let mut llvm_skip_rebuild = flags.llvm_skip_rebuild;
501 // Store off these values as options because if they're not provided
502 // we'll infer default values for them later
503 let mut llvm_assertions = None;
504 let mut debug = None;
505 let mut debug_assertions = None;
506 let mut debuginfo_level = None;
507 let mut debuginfo_level_rustc = None;
508 let mut debuginfo_level_std = None;
509 let mut debuginfo_level_tools = None;
510 let mut debuginfo_level_tests = None;
511 let mut optimize = None;
512 let mut ignore_git = None;
514 if let Some(ref llvm) = toml.llvm {
516 Some(StringOrBool::String(ref s)) => config.ccache = Some(s.to_string()),
517 Some(StringOrBool::Bool(true)) => {
518 config.ccache = Some("ccache".to_string());
520 Some(StringOrBool::Bool(false)) | None => {}
522 set(&mut config.ninja, llvm.ninja);
523 llvm_assertions = llvm.assertions;
524 llvm_skip_rebuild = llvm_skip_rebuild.or(llvm.skip_rebuild);
525 set(&mut config.llvm_optimize, llvm.optimize);
526 set(&mut config.llvm_thin_lto, llvm.thin_lto);
527 set(&mut config.llvm_release_debuginfo, llvm.release_debuginfo);
528 set(&mut config.llvm_version_check, llvm.version_check);
529 set(&mut config.llvm_static_stdcpp, llvm.static_libstdcpp);
530 set(&mut config.llvm_link_shared, llvm.link_shared);
531 config.llvm_targets = llvm.targets.clone();
532 config.llvm_experimental_targets = llvm.experimental_targets.clone();
533 config.llvm_link_jobs = llvm.link_jobs;
534 config.llvm_version_suffix = llvm.version_suffix.clone();
535 config.llvm_clang_cl = llvm.clang_cl.clone();
537 config.llvm_cflags = llvm.cflags.clone();
538 config.llvm_cxxflags = llvm.cxxflags.clone();
539 config.llvm_ldflags = llvm.ldflags.clone();
540 set(&mut config.llvm_use_libcxx, llvm.use_libcxx);
541 config.llvm_use_linker = llvm.use_linker.clone();
542 config.llvm_allow_old_toolchain = llvm.allow_old_toolchain.clone();
545 if let Some(ref rust) = toml.rust {
547 debug_assertions = rust.debug_assertions;
548 debuginfo_level = rust.debuginfo_level;
549 debuginfo_level_rustc = rust.debuginfo_level_rustc;
550 debuginfo_level_std = rust.debuginfo_level_std;
551 debuginfo_level_tools = rust.debuginfo_level_tools;
552 debuginfo_level_tests = rust.debuginfo_level_tests;
553 optimize = rust.optimize;
554 ignore_git = rust.ignore_git;
555 set(&mut config.rust_optimize_tests, rust.optimize_tests);
556 set(&mut config.codegen_tests, rust.codegen_tests);
557 set(&mut config.rust_rpath, rust.rpath);
558 set(&mut config.jemalloc, rust.jemalloc);
559 set(&mut config.test_compare_mode, rust.test_compare_mode);
560 set(&mut config.llvm_libunwind, rust.llvm_libunwind);
561 set(&mut config.backtrace, rust.backtrace);
562 set(&mut config.channel, rust.channel.clone());
563 set(&mut config.rust_dist_src, rust.dist_src);
564 set(&mut config.verbose_tests, rust.verbose_tests);
565 // in the case "false" is set explicitly, do not overwrite the command line args
566 if let Some(true) = rust.incremental {
567 config.incremental = true;
569 set(&mut config.lld_enabled, rust.lld);
570 set(&mut config.lldb_enabled, rust.lldb);
571 set(&mut config.llvm_tools_enabled, rust.llvm_tools);
572 config.rustc_parallel = rust.parallel_compiler.unwrap_or(false);
573 config.rustc_default_linker = rust.default_linker.clone();
574 config.musl_root = rust.musl_root.clone().map(PathBuf::from);
575 config.save_toolstates = rust.save_toolstates.clone().map(PathBuf::from);
576 set(&mut config.deny_warnings, flags.deny_warnings.or(rust.deny_warnings));
577 set(&mut config.backtrace_on_ice, rust.backtrace_on_ice);
578 set(&mut config.rust_verify_llvm_ir, rust.verify_llvm_ir);
579 config.rust_thin_lto_import_instr_limit = rust.thin_lto_import_instr_limit;
580 set(&mut config.rust_remap_debuginfo, rust.remap_debuginfo);
582 if let Some(ref backends) = rust.codegen_backends {
583 config.rust_codegen_backends =
584 backends.iter().map(|s| INTERNER.intern_str(s)).collect();
587 config.rust_codegen_units = rust.codegen_units.map(threads_from_config);
588 config.rust_codegen_units_std = rust.codegen_units_std.map(threads_from_config);
591 if let Some(ref t) = toml.target {
592 for (triple, cfg) in t {
593 let mut target = Target::default();
595 if let Some(ref s) = cfg.llvm_config {
596 target.llvm_config = Some(config.src.join(s));
598 if let Some(ref s) = cfg.llvm_filecheck {
599 target.llvm_filecheck = Some(config.src.join(s));
601 if let Some(ref s) = cfg.android_ndk {
602 target.ndk = Some(config.src.join(s));
604 target.cc = cfg.cc.clone().map(PathBuf::from);
605 target.cxx = cfg.cxx.clone().map(PathBuf::from);
606 target.ar = cfg.ar.clone().map(PathBuf::from);
607 target.ranlib = cfg.ranlib.clone().map(PathBuf::from);
608 target.linker = cfg.linker.clone().map(PathBuf::from);
609 target.crt_static = cfg.crt_static.clone();
610 target.musl_root = cfg.musl_root.clone().map(PathBuf::from);
611 target.wasi_root = cfg.wasi_root.clone().map(PathBuf::from);
612 target.qemu_rootfs = cfg.qemu_rootfs.clone().map(PathBuf::from);
614 config.target_config.insert(INTERNER.intern_string(triple.clone()), target);
618 if let Some(ref t) = toml.dist {
619 config.dist_sign_folder = t.sign_folder.clone().map(PathBuf::from);
620 config.dist_gpg_password_file = t.gpg_password_file.clone().map(PathBuf::from);
621 config.dist_upload_addr = t.upload_addr.clone();
622 set(&mut config.rust_dist_src, t.src_tarball);
623 set(&mut config.missing_tools, t.missing_tools);
626 // Now that we've reached the end of our configuration, infer the
627 // default values for all options that we haven't otherwise stored yet.
629 set(&mut config.initial_rustc, build.rustc.map(PathBuf::from));
630 set(&mut config.initial_cargo, build.cargo.map(PathBuf::from));
632 config.llvm_skip_rebuild = llvm_skip_rebuild.unwrap_or(false);
635 config.llvm_assertions = llvm_assertions.unwrap_or(default);
638 config.rust_optimize = optimize.unwrap_or(default);
640 let default = debug == Some(true);
641 config.rust_debug_assertions = debug_assertions.unwrap_or(default);
643 let with_defaults = |debuginfo_level_specific: Option<u32>| {
644 debuginfo_level_specific.or(debuginfo_level).unwrap_or(if debug == Some(true) {
650 config.rust_debuginfo_level_rustc = with_defaults(debuginfo_level_rustc);
651 config.rust_debuginfo_level_std = with_defaults(debuginfo_level_std);
652 config.rust_debuginfo_level_tools = with_defaults(debuginfo_level_tools);
653 config.rust_debuginfo_level_tests = debuginfo_level_tests.unwrap_or(0);
655 let default = config.channel == "dev";
656 config.ignore_git = ignore_git.unwrap_or(default);
661 /// Try to find the relative path of `bindir`, otherwise return it in full.
662 pub fn bindir_relative(&self) -> &Path {
663 let bindir = &self.bindir;
664 if bindir.is_absolute() {
665 // Try to make it relative to the prefix.
666 if let Some(prefix) = &self.prefix {
667 if let Ok(stripped) = bindir.strip_prefix(prefix) {
675 /// Try to find the relative path of `libdir`.
676 pub fn libdir_relative(&self) -> Option<&Path> {
677 let libdir = self.libdir.as_ref()?;
678 if libdir.is_relative() {
681 // Try to make it relative to the prefix.
682 libdir.strip_prefix(self.prefix.as_ref()?).ok()
686 pub fn verbose(&self) -> bool {
690 pub fn very_verbose(&self) -> bool {
694 pub fn llvm_enabled(&self) -> bool {
695 self.rust_codegen_backends.contains(&INTERNER.intern_str("llvm"))
699 fn set<T>(field: &mut T, val: Option<T>) {
700 if let Some(v) = val {
705 fn threads_from_config(v: u32) -> u32 {
707 0 => num_cpus::get() as u32,