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;
20 /// Global configuration for the entire build and/or bootstrap.
22 /// This structure is derived from a combination of both `config.toml` and
23 /// `config.mk`. As of the time of this writing it's unlikely that `config.toml`
24 /// is used all that much, so this is primarily filled out by `config.mk` which
25 /// is generated from `./configure`.
27 /// Note that this structure is not decoded directly into, but rather it is
28 /// filled out from the decoded forms of the structs below. For documentation
29 /// each field, see the corresponding fields in
30 /// `config.toml.example`.
33 pub ccache: Option<String>,
37 pub fast_submodules: bool,
38 pub compiler_docs: bool,
40 pub locked_deps: bool,
42 pub target_config: HashMap<Interned<String>, Target>,
43 pub full_bootstrap: bool,
45 pub tools: Option<HashSet<String>>,
49 pub exclude: Vec<PathBuf>,
50 pub rustc_error_format: Option<String>,
51 pub test_compare_mode: bool,
52 pub llvm_libunwind: bool,
54 pub skip_only_host_steps: bool,
56 pub on_fail: Option<String>,
57 pub stage: Option<u32>,
58 pub keep_stage: Vec<u32>,
60 pub jobs: Option<u32>,
62 pub incremental: bool,
65 pub deny_warnings: bool,
66 pub backtrace_on_ice: bool,
68 // llvm codegen options
69 pub llvm_skip_rebuild: bool,
70 pub llvm_assertions: bool,
71 pub llvm_optimize: bool,
72 pub llvm_thin_lto: bool,
73 pub llvm_release_debuginfo: bool,
74 pub llvm_version_check: bool,
75 pub llvm_static_stdcpp: bool,
76 pub llvm_link_shared: bool,
77 pub llvm_clang_cl: Option<String>,
78 pub llvm_targets: Option<String>,
79 pub llvm_experimental_targets: Option<String>,
80 pub llvm_link_jobs: Option<u32>,
81 pub llvm_version_suffix: Option<String>,
82 pub llvm_use_linker: Option<String>,
83 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,
119 pub control_flow_guard: bool,
122 pub dist_sign_folder: Option<PathBuf>,
123 pub dist_upload_addr: Option<String>,
124 pub dist_gpg_password_file: Option<PathBuf>,
127 pub backtrace: bool, // support for RUST_BACKTRACE
130 pub low_priority: bool,
132 pub verbose_tests: bool,
133 pub save_toolstates: Option<PathBuf>,
134 pub print_step_timings: bool,
135 pub missing_tools: bool,
137 // Fallback musl-root for all targets
138 pub musl_root: Option<PathBuf>,
139 pub prefix: Option<PathBuf>,
140 pub sysconfdir: Option<PathBuf>,
141 pub datadir: Option<PathBuf>,
142 pub docdir: Option<PathBuf>,
144 pub libdir: Option<PathBuf>,
145 pub mandir: Option<PathBuf>,
146 pub codegen_tests: bool,
147 pub nodejs: Option<PathBuf>,
148 pub gdb: Option<PathBuf>,
149 pub python: Option<PathBuf>,
150 pub cargo_native_static: bool,
151 pub configure_args: Vec<String>,
153 // These are either the stage0 downloaded binaries or the locally installed ones.
154 pub initial_cargo: PathBuf,
155 pub initial_rustc: PathBuf,
156 pub initial_rustfmt: Option<PathBuf>,
160 /// Per-target configuration stored in the global configuration structure.
163 /// Some(path to llvm-config) if using an external LLVM.
164 pub llvm_config: Option<PathBuf>,
165 /// Some(path to FileCheck) if one was specified.
166 pub llvm_filecheck: Option<PathBuf>,
167 pub cc: Option<PathBuf>,
168 pub cxx: Option<PathBuf>,
169 pub ar: Option<PathBuf>,
170 pub ranlib: Option<PathBuf>,
171 pub linker: Option<PathBuf>,
172 pub ndk: Option<PathBuf>,
173 pub crt_static: Option<bool>,
174 pub musl_root: Option<PathBuf>,
175 pub wasi_root: Option<PathBuf>,
176 pub qemu_rootfs: Option<PathBuf>,
181 pub fn from_triple(triple: &str) -> Self {
182 let mut target: Self = Default::default();
183 if triple.contains("-none-") || triple.contains("nvptx") {
184 target.no_std = true;
189 /// Structure of the `config.toml` file that configuration is read from.
191 /// This structure uses `Decodable` to automatically decode a TOML configuration
192 /// file into this format, and then this is traversed and written into the above
193 /// `Config` structure.
194 #[derive(Deserialize, Default)]
195 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
197 build: Option<Build>,
198 install: Option<Install>,
201 target: Option<HashMap<String, TomlTarget>>,
205 /// TOML representation of various global build decisions.
206 #[derive(Deserialize, Default, Clone)]
207 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
209 build: Option<String>,
214 cargo: Option<String>,
215 rustc: Option<String>,
216 rustfmt: Option<String>, /* allow bootstrap.py to use rustfmt key */
218 compiler_docs: Option<bool>,
219 submodules: Option<bool>,
220 fast_submodules: Option<bool>,
222 nodejs: Option<String>,
223 python: Option<String>,
224 locked_deps: Option<bool>,
225 vendor: Option<bool>,
226 full_bootstrap: Option<bool>,
227 extended: Option<bool>,
228 tools: Option<HashSet<String>>,
229 verbose: Option<usize>,
230 sanitizers: Option<bool>,
231 profiler: Option<bool>,
232 cargo_native_static: Option<bool>,
233 low_priority: Option<bool>,
234 configure_args: Option<Vec<String>>,
235 local_rebuild: Option<bool>,
236 print_step_timings: Option<bool>,
239 /// TOML representation of various global install decisions.
240 #[derive(Deserialize, Default, Clone)]
241 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
243 prefix: Option<String>,
244 sysconfdir: Option<String>,
245 docdir: Option<String>,
246 bindir: Option<String>,
247 libdir: Option<String>,
248 mandir: Option<String>,
249 datadir: Option<String>,
251 // standard paths, currently unused
252 infodir: Option<String>,
253 localstatedir: Option<String>,
256 /// TOML representation of how the LLVM build is configured.
257 #[derive(Deserialize, Default)]
258 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
260 skip_rebuild: Option<bool>,
261 optimize: Option<bool>,
262 thin_lto: Option<bool>,
263 release_debuginfo: Option<bool>,
264 assertions: Option<bool>,
265 ccache: Option<StringOrBool>,
266 version_check: Option<bool>,
267 static_libstdcpp: Option<bool>,
269 targets: Option<String>,
270 experimental_targets: Option<String>,
271 link_jobs: Option<u32>,
272 link_shared: Option<bool>,
273 version_suffix: Option<String>,
274 clang_cl: Option<String>,
275 cflags: Option<String>,
276 cxxflags: Option<String>,
277 ldflags: Option<String>,
278 use_libcxx: Option<bool>,
279 use_linker: Option<String>,
280 allow_old_toolchain: Option<bool>,
283 #[derive(Deserialize, Default, Clone)]
284 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
286 sign_folder: Option<String>,
287 gpg_password_file: Option<String>,
288 upload_addr: Option<String>,
289 src_tarball: Option<bool>,
290 missing_tools: Option<bool>,
293 #[derive(Deserialize)]
300 impl Default for StringOrBool {
301 fn default() -> StringOrBool {
302 StringOrBool::Bool(false)
306 /// TOML representation of how the Rust build is configured.
307 #[derive(Deserialize, Default)]
308 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
310 optimize: Option<bool>,
312 codegen_units: Option<u32>,
313 codegen_units_std: Option<u32>,
314 debug_assertions: Option<bool>,
315 debuginfo_level: Option<u32>,
316 debuginfo_level_rustc: Option<u32>,
317 debuginfo_level_std: Option<u32>,
318 debuginfo_level_tools: Option<u32>,
319 debuginfo_level_tests: Option<u32>,
320 backtrace: Option<bool>,
321 incremental: Option<bool>,
322 parallel_compiler: Option<bool>,
323 default_linker: Option<String>,
324 channel: Option<String>,
325 musl_root: Option<String>,
327 verbose_tests: Option<bool>,
328 optimize_tests: Option<bool>,
329 codegen_tests: Option<bool>,
330 ignore_git: Option<bool>,
331 dist_src: Option<bool>,
332 save_toolstates: Option<String>,
333 codegen_backends: Option<Vec<String>>,
335 use_lld: Option<bool>,
336 llvm_tools: Option<bool>,
338 deny_warnings: Option<bool>,
339 backtrace_on_ice: Option<bool>,
340 verify_llvm_ir: Option<bool>,
341 thin_lto_import_instr_limit: Option<u32>,
342 remap_debuginfo: Option<bool>,
343 jemalloc: Option<bool>,
344 test_compare_mode: Option<bool>,
345 llvm_libunwind: Option<bool>,
346 control_flow_guard: Option<bool>,
349 /// TOML representation of how each build target is configured.
350 #[derive(Deserialize, Default)]
351 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
356 ranlib: Option<String>,
357 linker: Option<String>,
358 llvm_config: Option<String>,
359 llvm_filecheck: Option<String>,
360 android_ndk: Option<String>,
361 crt_static: Option<bool>,
362 musl_root: Option<String>,
363 wasi_root: Option<String>,
364 qemu_rootfs: Option<String>,
365 no_std: Option<bool>,
369 fn path_from_python(var_key: &str) -> PathBuf {
370 match env::var_os(var_key) {
371 Some(var_val) => Self::normalize_python_path(var_val),
372 _ => panic!("expected '{}' to be set", var_key),
376 /// Normalizes paths from Python slightly. We don't trust paths from Python (#49785).
377 fn normalize_python_path(path: OsString) -> PathBuf {
378 Path::new(&path).components().collect()
381 pub fn default_opts() -> Config {
382 let mut config = Config::default();
383 config.llvm_optimize = true;
384 config.llvm_version_check = true;
385 config.backtrace = true;
386 config.rust_optimize = true;
387 config.rust_optimize_tests = true;
388 config.submodules = true;
389 config.fast_submodules = true;
391 config.rust_rpath = true;
392 config.channel = "dev".to_string();
393 config.codegen_tests = true;
394 config.ignore_git = false;
395 config.rust_dist_src = true;
396 config.rust_codegen_backends = vec![INTERNER.intern_str("llvm")];
397 config.deny_warnings = true;
398 config.missing_tools = false;
400 // set by bootstrap.py
401 config.build = INTERNER.intern_str(&env::var("BUILD").expect("'BUILD' to be set"));
402 config.src = Config::path_from_python("SRC");
403 config.out = Config::path_from_python("BUILD_DIR");
405 config.initial_rustc = Config::path_from_python("RUSTC");
406 config.initial_cargo = Config::path_from_python("CARGO");
407 config.initial_rustfmt = env::var_os("RUSTFMT").map(Config::normalize_python_path);
412 pub fn parse(args: &[String]) -> Config {
413 let flags = Flags::parse(&args);
414 let file = flags.config.clone();
415 let mut config = Config::default_opts();
416 config.exclude = flags.exclude;
417 config.rustc_error_format = flags.rustc_error_format;
418 config.on_fail = flags.on_fail;
419 config.stage = flags.stage;
420 config.jobs = flags.jobs.map(threads_from_config);
421 config.cmd = flags.cmd;
422 config.incremental = flags.incremental;
423 config.dry_run = flags.dry_run;
424 config.keep_stage = flags.keep_stage;
425 config.bindir = "bin".into(); // default
426 if let Some(value) = flags.deny_warnings {
427 config.deny_warnings = value;
431 let dir = config.out.join("tmp-dry-run");
432 t!(fs::create_dir_all(&dir));
436 // If --target was specified but --host wasn't specified, don't run any host-only tests.
437 let has_hosts = !flags.host.is_empty();
438 let has_targets = !flags.target.is_empty();
439 config.skip_only_host_steps = !has_hosts && has_targets;
443 let contents = t!(fs::read_to_string(&file));
444 match toml::from_str(&contents) {
448 "failed to parse TOML configuration '{}': {}",
456 .unwrap_or_else(TomlConfig::default);
458 let build = toml.build.clone().unwrap_or_default();
459 // set by bootstrap.py
460 config.hosts.push(config.build.clone());
461 for host in build.host.iter() {
462 let host = INTERNER.intern_str(host);
463 if !config.hosts.contains(&host) {
464 config.hosts.push(host);
468 config.hosts.iter().cloned().chain(build.target.iter().map(|s| INTERNER.intern_str(s)))
470 if !config.targets.contains(&target) {
471 config.targets.push(target);
474 config.hosts = if !flags.host.is_empty() { flags.host } else { config.hosts };
475 config.targets = if !flags.target.is_empty() { flags.target } else { config.targets };
477 config.nodejs = build.nodejs.map(PathBuf::from);
478 config.gdb = build.gdb.map(PathBuf::from);
479 config.python = build.python.map(PathBuf::from);
480 set(&mut config.low_priority, build.low_priority);
481 set(&mut config.compiler_docs, build.compiler_docs);
482 set(&mut config.docs, build.docs);
483 set(&mut config.submodules, build.submodules);
484 set(&mut config.fast_submodules, build.fast_submodules);
485 set(&mut config.locked_deps, build.locked_deps);
486 set(&mut config.vendor, build.vendor);
487 set(&mut config.full_bootstrap, build.full_bootstrap);
488 set(&mut config.extended, build.extended);
489 config.tools = build.tools;
490 set(&mut config.verbose, build.verbose);
491 set(&mut config.sanitizers, build.sanitizers);
492 set(&mut config.profiler, build.profiler);
493 set(&mut config.cargo_native_static, build.cargo_native_static);
494 set(&mut config.configure_args, build.configure_args);
495 set(&mut config.local_rebuild, build.local_rebuild);
496 set(&mut config.print_step_timings, build.print_step_timings);
497 config.verbose = cmp::max(config.verbose, flags.verbose);
499 if let Some(ref install) = toml.install {
500 config.prefix = install.prefix.clone().map(PathBuf::from);
501 config.sysconfdir = install.sysconfdir.clone().map(PathBuf::from);
502 config.datadir = install.datadir.clone().map(PathBuf::from);
503 config.docdir = install.docdir.clone().map(PathBuf::from);
504 set(&mut config.bindir, install.bindir.clone().map(PathBuf::from));
505 config.libdir = install.libdir.clone().map(PathBuf::from);
506 config.mandir = install.mandir.clone().map(PathBuf::from);
509 // We want the llvm-skip-rebuild flag to take precedence over the
510 // skip-rebuild config.toml option so we store it separately
511 // so that we can infer the right value
512 let mut llvm_skip_rebuild = flags.llvm_skip_rebuild;
514 // Store off these values as options because if they're not provided
515 // we'll infer default values for them later
516 let mut llvm_assertions = None;
517 let mut debug = None;
518 let mut debug_assertions = None;
519 let mut debuginfo_level = None;
520 let mut debuginfo_level_rustc = None;
521 let mut debuginfo_level_std = None;
522 let mut debuginfo_level_tools = None;
523 let mut debuginfo_level_tests = None;
524 let mut optimize = None;
525 let mut ignore_git = None;
527 if let Some(ref llvm) = toml.llvm {
529 Some(StringOrBool::String(ref s)) => config.ccache = Some(s.to_string()),
530 Some(StringOrBool::Bool(true)) => {
531 config.ccache = Some("ccache".to_string());
533 Some(StringOrBool::Bool(false)) | None => {}
535 set(&mut config.ninja, llvm.ninja);
536 llvm_assertions = llvm.assertions;
537 llvm_skip_rebuild = llvm_skip_rebuild.or(llvm.skip_rebuild);
538 set(&mut config.llvm_optimize, llvm.optimize);
539 set(&mut config.llvm_thin_lto, llvm.thin_lto);
540 set(&mut config.llvm_release_debuginfo, llvm.release_debuginfo);
541 set(&mut config.llvm_version_check, llvm.version_check);
542 set(&mut config.llvm_static_stdcpp, llvm.static_libstdcpp);
543 set(&mut config.llvm_link_shared, llvm.link_shared);
544 config.llvm_targets = llvm.targets.clone();
545 config.llvm_experimental_targets = llvm.experimental_targets.clone();
546 config.llvm_link_jobs = llvm.link_jobs;
547 config.llvm_version_suffix = llvm.version_suffix.clone();
548 config.llvm_clang_cl = llvm.clang_cl.clone();
550 config.llvm_cflags = llvm.cflags.clone();
551 config.llvm_cxxflags = llvm.cxxflags.clone();
552 config.llvm_ldflags = llvm.ldflags.clone();
553 set(&mut config.llvm_use_libcxx, llvm.use_libcxx);
554 config.llvm_use_linker = llvm.use_linker.clone();
555 config.llvm_allow_old_toolchain = llvm.allow_old_toolchain;
558 if let Some(ref rust) = toml.rust {
560 debug_assertions = rust.debug_assertions;
561 debuginfo_level = rust.debuginfo_level;
562 debuginfo_level_rustc = rust.debuginfo_level_rustc;
563 debuginfo_level_std = rust.debuginfo_level_std;
564 debuginfo_level_tools = rust.debuginfo_level_tools;
565 debuginfo_level_tests = rust.debuginfo_level_tests;
566 optimize = rust.optimize;
567 ignore_git = rust.ignore_git;
568 set(&mut config.rust_optimize_tests, rust.optimize_tests);
569 set(&mut config.codegen_tests, rust.codegen_tests);
570 set(&mut config.rust_rpath, rust.rpath);
571 set(&mut config.jemalloc, rust.jemalloc);
572 set(&mut config.test_compare_mode, rust.test_compare_mode);
573 set(&mut config.llvm_libunwind, rust.llvm_libunwind);
574 set(&mut config.backtrace, rust.backtrace);
575 set(&mut config.channel, rust.channel.clone());
576 set(&mut config.rust_dist_src, rust.dist_src);
577 set(&mut config.verbose_tests, rust.verbose_tests);
578 // in the case "false" is set explicitly, do not overwrite the command line args
579 if let Some(true) = rust.incremental {
580 config.incremental = true;
582 set(&mut config.use_lld, rust.use_lld);
583 set(&mut config.lld_enabled, rust.lld);
584 set(&mut config.lldb_enabled, rust.lldb);
585 set(&mut config.llvm_tools_enabled, rust.llvm_tools);
586 config.rustc_parallel = rust.parallel_compiler.unwrap_or(false);
587 config.rustc_default_linker = rust.default_linker.clone();
588 config.musl_root = rust.musl_root.clone().map(PathBuf::from);
589 config.save_toolstates = rust.save_toolstates.clone().map(PathBuf::from);
590 set(&mut config.deny_warnings, flags.deny_warnings.or(rust.deny_warnings));
591 set(&mut config.backtrace_on_ice, rust.backtrace_on_ice);
592 set(&mut config.rust_verify_llvm_ir, rust.verify_llvm_ir);
593 config.rust_thin_lto_import_instr_limit = rust.thin_lto_import_instr_limit;
594 set(&mut config.rust_remap_debuginfo, rust.remap_debuginfo);
595 set(&mut config.control_flow_guard, rust.control_flow_guard);
597 if let Some(ref backends) = rust.codegen_backends {
598 config.rust_codegen_backends =
599 backends.iter().map(|s| INTERNER.intern_str(s)).collect();
602 config.rust_codegen_units = rust.codegen_units.map(threads_from_config);
603 config.rust_codegen_units_std = rust.codegen_units_std.map(threads_from_config);
606 if let Some(ref t) = toml.target {
607 for (triple, cfg) in t {
608 let mut target = Target::from_triple(triple);
610 if let Some(ref s) = cfg.llvm_config {
611 target.llvm_config = Some(config.src.join(s));
613 if let Some(ref s) = cfg.llvm_filecheck {
614 target.llvm_filecheck = Some(config.src.join(s));
616 if let Some(ref s) = cfg.android_ndk {
617 target.ndk = Some(config.src.join(s));
619 if let Some(s) = cfg.no_std {
622 target.cc = cfg.cc.clone().map(PathBuf::from);
623 target.cxx = cfg.cxx.clone().map(PathBuf::from);
624 target.ar = cfg.ar.clone().map(PathBuf::from);
625 target.ranlib = cfg.ranlib.clone().map(PathBuf::from);
626 target.linker = cfg.linker.clone().map(PathBuf::from);
627 target.crt_static = cfg.crt_static;
628 target.musl_root = cfg.musl_root.clone().map(PathBuf::from);
629 target.wasi_root = cfg.wasi_root.clone().map(PathBuf::from);
630 target.qemu_rootfs = cfg.qemu_rootfs.clone().map(PathBuf::from);
632 config.target_config.insert(INTERNER.intern_string(triple.clone()), target);
636 if let Some(ref t) = toml.dist {
637 config.dist_sign_folder = t.sign_folder.clone().map(PathBuf::from);
638 config.dist_gpg_password_file = t.gpg_password_file.clone().map(PathBuf::from);
639 config.dist_upload_addr = t.upload_addr.clone();
640 set(&mut config.rust_dist_src, t.src_tarball);
641 set(&mut config.missing_tools, t.missing_tools);
644 // Now that we've reached the end of our configuration, infer the
645 // default values for all options that we haven't otherwise stored yet.
647 set(&mut config.initial_rustc, build.rustc.map(PathBuf::from));
648 set(&mut config.initial_cargo, build.cargo.map(PathBuf::from));
650 config.llvm_skip_rebuild = llvm_skip_rebuild.unwrap_or(false);
653 config.llvm_assertions = llvm_assertions.unwrap_or(default);
656 config.rust_optimize = optimize.unwrap_or(default);
658 let default = debug == Some(true);
659 config.rust_debug_assertions = debug_assertions.unwrap_or(default);
661 let with_defaults = |debuginfo_level_specific: Option<u32>| {
662 debuginfo_level_specific.or(debuginfo_level).unwrap_or(if debug == Some(true) {
668 config.rust_debuginfo_level_rustc = with_defaults(debuginfo_level_rustc);
669 config.rust_debuginfo_level_std = with_defaults(debuginfo_level_std);
670 config.rust_debuginfo_level_tools = with_defaults(debuginfo_level_tools);
671 config.rust_debuginfo_level_tests = debuginfo_level_tests.unwrap_or(0);
673 let default = config.channel == "dev";
674 config.ignore_git = ignore_git.unwrap_or(default);
679 /// Try to find the relative path of `bindir`, otherwise return it in full.
680 pub fn bindir_relative(&self) -> &Path {
681 let bindir = &self.bindir;
682 if bindir.is_absolute() {
683 // Try to make it relative to the prefix.
684 if let Some(prefix) = &self.prefix {
685 if let Ok(stripped) = bindir.strip_prefix(prefix) {
693 /// Try to find the relative path of `libdir`.
694 pub fn libdir_relative(&self) -> Option<&Path> {
695 let libdir = self.libdir.as_ref()?;
696 if libdir.is_relative() {
699 // Try to make it relative to the prefix.
700 libdir.strip_prefix(self.prefix.as_ref()?).ok()
704 pub fn verbose(&self) -> bool {
708 pub fn very_verbose(&self) -> bool {
712 pub fn llvm_enabled(&self) -> bool {
713 self.rust_codegen_backends.contains(&INTERNER.intern_str("llvm"))
717 fn set<T>(field: &mut T, val: Option<T>) {
718 if let Some(v) = val {
723 fn threads_from_config(v: u32) -> u32 {
725 0 => num_cpus::get() as u32,