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z-help.stdout
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-Z allow-features=val -- only allow the listed language features to be enabled in code (space separated)
-Z always-encode-mir=val -- encode MIR of all functions into the crate metadata (default: no)
-Z assume-incomplete-release=val -- make cfg(version) treat the current version as incomplete (default: no)
-Z asm-comments=val -- generate comments into the assembly (may change behavior) (default: no)
-Z assert-incr-state=val -- assert that the incremental cache is in given state: either `loaded` or `not-loaded`.
-Z binary-dep-depinfo=val -- include artifacts (sysroot, crate dependencies) used during compilation in dep-info (default: no)
-Z box-noalias=val -- emit noalias metadata for box (default: yes)
-Z branch-protection=val -- set options for branch target identification and pointer authentication on AArch64
-Z cf-protection=val -- instrument control-flow architecture protection
-Z cgu-partitioning-strategy=val -- the codegen unit partitioning strategy to use
-Z chalk=val -- enable the experimental Chalk-based trait solving engine
-Z codegen-backend=val -- the backend to use
-Z combine-cgu=val -- combine CGUs into a single one
-Z crate-attr=val -- inject the given attribute in the crate
-Z debug-info-for-profiling=val -- emit discriminators and other data necessary for AutoFDO
-Z debug-macros=val -- emit line numbers debug info inside macros (default: no)
-Z deduplicate-diagnostics=val -- deduplicate identical diagnostics (default: yes)
-Z dep-info-omit-d-target=val -- in dep-info output, omit targets for tracking dependencies of the dep-info files themselves (default: no)
-Z dep-tasks=val -- print tasks that execute and the color their dep node gets (requires debug build) (default: no)
-Z dlltool=val -- import library generation tool (windows-gnu only)
-Z dont-buffer-diagnostics=val -- emit diagnostics rather than buffering (breaks NLL error downgrading, sorting) (default: no)
-Z drop-tracking=val -- enables drop tracking in generators (default: no)
-Z dual-proc-macros=val -- load proc macros for both target and host, but only link to the target (default: no)
-Z dump-dep-graph=val -- dump the dependency graph to $RUST_DEP_GRAPH (default: /tmp/dep_graph.gv) (default: no)
-Z dump-drop-tracking-cfg=val -- dump drop-tracking control-flow graph as a `.dot` file (default: no)
-Z dump-mir=val -- dump MIR state to file.
`val` is used to select which passes and functions to dump. For example:
`all` matches all passes and functions,
`foo` matches all passes for functions whose name contains 'foo',
`foo & ConstProp` only the 'ConstProp' pass for function names containing 'foo',
`foo | bar` all passes for function names containing 'foo' or 'bar'.
-Z dump-mir-dataflow=val -- in addition to `.mir` files, create graphviz `.dot` files with dataflow results (default: no)
-Z dump-mir-dir=val -- the directory the MIR is dumped into (default: `mir_dump`)
-Z dump-mir-exclude-pass-number=val -- exclude the pass number when dumping MIR (used in tests) (default: no)
-Z dump-mir-graphviz=val -- in addition to `.mir` files, create graphviz `.dot` files (and with `-Z instrument-coverage`, also create a `.dot` file for the MIR-derived coverage graph) (default: no)
-Z dump-mir-spanview=val -- in addition to `.mir` files, create `.html` files to view spans for all `statement`s (including terminators), only `terminator` spans, or computed `block` spans (one span encompassing a block's terminator and all statements). If `-Z instrument-coverage` is also enabled, create an additional `.html` file showing the computed coverage spans.
-Z dwarf-version=val -- version of DWARF debug information to emit (default: 2 or 4, depending on platform)
-Z emit-stack-sizes=val -- emit a section containing stack size metadata (default: no)
-Z emit-thin-lto=val -- emit the bc module with thin LTO info (default: yes)
-Z export-executable-symbols=val -- export symbols from executables, as if they were dynamic libraries
-Z extra-const-ub-checks=val -- turns on more checks to detect const UB, which can be slow (default: no)
-Z fewer-names=val -- reduce memory use by retaining fewer names within compilation artifacts (LLVM-IR) (default: no)
-Z force-unstable-if-unmarked=val -- force all crates to be `rustc_private` unstable (default: no)
-Z fuel=val -- set the optimization fuel quota for a crate
-Z function-sections=val -- whether each function should go in its own section
-Z future-incompat-test=val -- forces all lints to be future incompatible, used for internal testing (default: no)
-Z gcc-ld=val -- implementation of ld used by cc
-Z graphviz-dark-mode=val -- use dark-themed colors in graphviz output (default: no)
-Z graphviz-font=val -- use the given `fontname` in graphviz output; can be overridden by setting environment variable `RUSTC_GRAPHVIZ_FONT` (default: `Courier, monospace`)
-Z hir-stats=val -- print some statistics about AST and HIR (default: no)
-Z human-readable-cgu-names=val -- generate human-readable, predictable names for codegen units (default: no)
-Z identify-regions=val -- display unnamed regions as `'<id>`, using a non-ident unique id (default: no)
-Z incremental-ignore-spans=val -- ignore spans during ICH computation -- used for testing (default: no)
-Z incremental-info=val -- print high-level information about incremental reuse (or the lack thereof) (default: no)
-Z incremental-relative-spans=val -- hash spans relative to their parent item for incr. comp. (default: no)
-Z incremental-verify-ich=val -- verify incr. comp. hashes of green query instances (default: no)
-Z inline-llvm=val -- enable LLVM inlining (default: yes)
-Z inline-mir=val -- enable MIR inlining (default: no)
-Z inline-mir-threshold=val -- a default MIR inlining threshold (default: 50)
-Z inline-mir-hint-threshold=val -- inlining threshold for functions with inline hint (default: 100)
-Z inline-in-all-cgus=val -- control whether `#[inline]` functions are in all CGUs
-Z input-stats=val -- gather statistics about the input (default: no)
-Z instrument-coverage=val -- instrument the generated code to support LLVM source-based code coverage reports (note, the compiler build config must include `profiler = true`); implies `-C symbol-mangling-version=v0`. Optional values are:
`=all` (implicit value)
`=except-unused-generics`
`=except-unused-functions`
`=off` (default)
-Z instrument-mcount=val -- insert function instrument code for mcount-based tracing (default: no)
-Z keep-hygiene-data=val -- keep hygiene data after analysis (default: no)
-Z link-native-libraries=val -- link native libraries in the linker invocation (default: yes)
-Z link-only=val -- link the `.rlink` file generated by `-Z no-link` (default: no)
-Z llvm-plugins=val -- a list LLVM plugins to enable (space separated)
-Z llvm-time-trace=val -- generate JSON tracing data file from LLVM data (default: no)
-Z location-detail=val -- what location details should be tracked when using caller_location, either `none`, or a comma separated list of location details, for which valid options are `file`, `line`, and `column` (default: `file,line,column`)
-Z ls=val -- list the symbols defined by a library crate (default: no)
-Z macro-backtrace=val -- show macro backtraces (default: no)
-Z merge-functions=val -- control the operation of the MergeFunctions LLVM pass, taking the same values as the target option of the same name
-Z meta-stats=val -- gather metadata statistics (default: no)
-Z mir-emit-retag=val -- emit Retagging MIR statements, interpreted e.g., by miri; implies -Zmir-opt-level=0 (default: no)
-Z mir-enable-passes=val -- use like `-Zmir-enable-passes=+DestProp,-InstCombine`. Forces the specified passes to be enabled, overriding all other checks. Passes that are not specified are enabled or disabled by other flags as usual.
-Z mir-pretty-relative-line-numbers=val -- use line numbers relative to the function in mir pretty printing
-Z mir-opt-level=val -- MIR optimization level (0-4; default: 1 in non optimized builds and 2 in optimized builds)
-Z move-size-limit=val -- the size at which the `large_assignments` lint starts to be emitted
-Z mutable-noalias=val -- emit noalias metadata for mutable references (default: yes)
-Z new-llvm-pass-manager=val -- use new LLVM pass manager (default: no)
-Z nll-facts=val -- dump facts from NLL analysis into side files (default: no)
-Z nll-facts-dir=val -- the directory the NLL facts are dumped into (default: `nll-facts`)
-Z no-analysis=val -- parse and expand the source, but run no analysis
-Z no-codegen=val -- run all passes except codegen; no output
-Z no-generate-arange-section=val -- omit DWARF address ranges that give faster lookups
-Z no-interleave-lints=val -- execute lints separately; allows benchmarking individual lints
-Z no-leak-check=val -- disable the 'leak check' for subtyping; unsound, but useful for tests
-Z no-link=val -- compile without linking
-Z no-parallel-llvm=val -- run LLVM in non-parallel mode (while keeping codegen-units and ThinLTO)
-Z no-unique-section-names=val -- do not use unique names for text and data sections when -Z function-sections is used
-Z no-profiler-runtime=val -- prevent automatic injection of the profiler_builtins crate
-Z normalize-docs=val -- normalize associated items in rustdoc when generating documentation
-Z oom=val -- panic strategy for out-of-memory handling
-Z osx-rpath-install-name=val -- pass `-install_name @rpath/...` to the macOS linker (default: no)
-Z diagnostic-width=val -- set the current output width for diagnostic truncation
-Z panic-abort-tests=val -- support compiling tests with panic=abort (default: no)
-Z panic-in-drop=val -- panic strategy for panics in drops
-Z parse-only=val -- parse only; do not compile, assemble, or link (default: no)
-Z perf-stats=val -- print some performance-related statistics (default: no)
-Z pick-stable-methods-before-any-unstable=val -- try to pick stable methods first before picking any unstable methods (default: yes)
-Z plt=val -- whether to use the PLT when calling into shared libraries;
only has effect for PIC code on systems with ELF binaries
(default: PLT is disabled if full relro is enabled)
-Z polonius=val -- enable polonius-based borrow-checker (default: no)
-Z polymorphize=val -- perform polymorphization analysis
-Z pre-link-arg=val -- a single extra argument to prepend the linker invocation (can be used several times)
-Z pre-link-args=val -- extra arguments to prepend to the linker invocation (space separated)
-Z precise-enum-drop-elaboration=val -- use a more precise version of drop elaboration for matches on enums (default: yes). This results in better codegen, but has caused miscompilations on some tier 2 platforms. See #77382 and #74551.
-Z print-fuel=val -- make rustc print the total optimization fuel used by a crate
-Z print-llvm-passes=val -- print the LLVM optimization passes being run (default: no)
-Z print-mono-items=val -- print the result of the monomorphization collection pass
-Z print-type-sizes=val -- print layout information for each type encountered (default: no)
-Z proc-macro-backtrace=val -- show backtraces for panics during proc-macro execution (default: no)
-Z proc-macro-execution-strategy=val -- how to run proc-macro code (default: same-thread)
-Z profile=val -- insert profiling code (default: no)
-Z profile-closures=val -- profile size of closures
-Z profile-emit=val -- file path to emit profiling data at runtime when using 'profile' (default based on relative source path)
-Z profiler-runtime=val -- name of the profiler runtime crate to automatically inject (default: `profiler_builtins`)
-Z profile-sample-use=val -- use the given `.prof` file for sampled profile-guided optimization (also known as AutoFDO)
-Z query-dep-graph=val -- enable queries of the dependency graph for regression testing (default: no)
-Z randomize-layout=val -- randomize the layout of types (default: no)
-Z layout-seed=val -- seed layout randomization
-Z relax-elf-relocations=val -- whether ELF relocations can be relaxed
-Z relro-level=val -- choose which RELRO level to use
-Z remap-cwd-prefix=val -- remap paths under the current working directory to this path prefix
-Z simulate-remapped-rust-src-base=val -- simulate the effect of remap-debuginfo = true at bootstrapping by remapping path to rust's source base directory. only meant for testing purposes
-Z report-delayed-bugs=val -- immediately print bugs registered with `delay_span_bug` (default: no)
-Z sanitizer=val -- use a sanitizer
-Z sanitizer-memory-track-origins=val -- enable origins tracking in MemorySanitizer
-Z sanitizer-recover=val -- enable recovery for selected sanitizers
-Z saturating-float-casts=val -- make float->int casts UB-free: numbers outside the integer type's range are clipped to the max/min integer respectively, and NaN is mapped to 0 (default: yes)
-Z save-analysis=val -- write syntax and type analysis (in JSON format) information, in addition to normal output (default: no)
-Z self-profile=val -- run the self profiler and output the raw event data
-Z self-profile-events=val -- specify the events recorded by the self profiler;
for example: `-Z self-profile-events=default,query-keys`
all options: none, all, default, generic-activity, query-provider, query-cache-hit
query-blocked, incr-cache-load, incr-result-hashing, query-keys, function-args, args, llvm, artifact-sizes
-Z self-profile-counter=val -- counter used by the self profiler (default: `wall-time`), one of:
`wall-time` (monotonic clock, i.e. `std::time::Instant`)
`instructions:u` (retired instructions, userspace-only)
`instructions-minus-irqs:u` (subtracting hardware interrupt counts for extra accuracy)
-Z share-generics=val -- make the current crate share its generic instantiations
-Z show-span=val -- show spans for compiler debugging (expr|pat|ty)
-Z span-debug=val -- forward proc_macro::Span's `Debug` impl to `Span`
-Z span-free-formats=val -- exclude spans when debug-printing compiler state (default: no)
-Z src-hash-algorithm=val -- hash algorithm of source files in debug info (`md5`, `sha1`, or `sha256`)
-Z stack-protector=val -- control stack smash protection strategy (`rustc --print stack-protector-strategies` for details)
-Z strict-init-checks=val -- control if mem::uninitialized and mem::zeroed panic on more UB
-Z strip=val -- tell the linker which information to strip (`none` (default), `debuginfo` or `symbols`)
-Z split-dwarf-kind=val -- split dwarf variant (only if -Csplit-debuginfo is enabled and on relevant platform)
(default: `split`)
`split`: sections which do not require relocation are written into a DWARF object (`.dwo`)
file which is ignored by the linker
`single`: sections which do not require relocation are written into object file but ignored
by the linker
-Z split-dwarf-inlining=val -- provide minimal debug info in the object/executable to facilitate online symbolication/stack traces in the absence of .dwo/.dwp files when using Split DWARF
-Z symbol-mangling-version=val -- which mangling version to use for symbol names ('legacy' (default) or 'v0')
-Z teach=val -- show extended diagnostic help (default: no)
-Z temps-dir=val -- the directory the intermediate files are written to
-Z translate-lang=val -- language identifier for diagnostic output
-Z translate-additional-ftl=val -- additional fluent translation to preferentially use (for testing translation)
-Z translate-directionality-markers=val -- emit directionality isolation markers in translated diagnostics
-Z tune-cpu=val -- select processor to schedule for (`rustc --print target-cpus` for details)
-Z thinlto=val -- enable ThinLTO when possible
-Z thir-unsafeck=val -- use the THIR unsafety checker (default: no)
-Z threads=val -- use a thread pool with N threads
-Z time=val -- measure time of rustc processes (default: no)
-Z time-llvm-passes=val -- measure time of each LLVM pass (default: no)
-Z time-passes=val -- measure time of each rustc pass (default: no)
-Z tls-model=val -- choose the TLS model to use (`rustc --print tls-models` for details)
-Z trace-macros=val -- for every macro invocation, print its name and arguments (default: no)
-Z translate-remapped-path-to-local-path=val -- translate remapped paths into local paths when possible (default: yes)
-Z trap-unreachable=val -- generate trap instructions for unreachable intrinsics (default: use target setting, usually yes)
-Z treat-err-as-bug=val -- treat error number `val` that occurs as bug
-Z trim-diagnostic-paths=val -- in diagnostics, use heuristics to shorten paths referring to items
-Z ui-testing=val -- emit compiler diagnostics in a form suitable for UI testing (default: no)
-Z uninit-const-chunk-threshold=val -- allow generating const initializers with mixed init/uninit chunks, and set the maximum number of chunks for which this is allowed (default: 16)
-Z unleash-the-miri-inside-of-you=val -- take the brakes off const evaluation. NOTE: this is unsound (default: no)
-Z unpretty=val -- present the input source, unstable (and less-pretty) variants;
`normal`, `identified`,
`expanded`, `expanded,identified`,
`expanded,hygiene` (with internal representations),
`ast-tree` (raw AST before expansion),
`ast-tree,expanded` (raw AST after expansion),
`hir` (the HIR), `hir,identified`,
`hir,typed` (HIR with types for each node),
`hir-tree` (dump the raw HIR),
`mir` (the MIR), or `mir-cfg` (graphviz formatted MIR)
-Z unsound-mir-opts=val -- enable unsound and buggy MIR optimizations (default: no)
-Z unstable-options=val -- adds unstable command line options to rustc interface (default: no)
-Z use-ctors-section=val -- use legacy .ctors section for initializers rather than .init_array
-Z validate-mir=val -- validate MIR after each transformation
-Z verbose=val -- in general, enable more debug printouts (default: no)
-Z verify-llvm-ir=val -- verify LLVM IR (default: no)
-Z virtual-function-elimination=val -- enables dead virtual function elimination optimization. Requires `-Clto[=[fat,yes]]`
-Z wasi-exec-model=val -- whether to build a wasi command or reactor