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.TH RUSTC "1" "February 2021" "rustc 1.50.0" "User Commands"
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.SH NAME
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rustc \- The Rust compiler
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.SH SYNOPSIS
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.B rustc
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[\fIOPTIONS\fR] \fIINPUT\fR
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.SH DESCRIPTION
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This program is a compiler for the Rust language, available at https://www.rust\-lang.org.
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.SH OPTIONS
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.TP
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\fB\-h\fR, \fB\-\-help\fR
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Display the help message.
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.TP
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\fB\-\-cfg\fR \fISPEC\fR
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Configure the compilation environment.
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.TP
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\fB\-L\fR [\fIKIND\fR=]\fIPATH\fR
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Add a directory to the library search path.
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The optional \fIKIND\fR can be one of:
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.RS
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.TP
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\fBdependency\fR
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only lookup transitive dependencies here
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.TP
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.B crate
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only lookup local `extern crate` directives here
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.TP
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.B native
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only lookup native libraries here
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.TP
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.B framework
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only look for OSX frameworks here
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.TP
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.B all
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look for anything here (the default)
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.RE
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.TP
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\fB\-l\fR [\fIKIND\fR=]\fINAME\fR
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Link the generated crate(s) to the specified library \fINAME\fR.
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The optional \fIKIND\fR can be one of \fIstatic\fR, \fIdylib\fR, or
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\fIframework\fR.
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If omitted, \fIdylib\fR is assumed.
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.TP
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\fB\-\-crate\-type\fR [bin|lib|rlib|dylib|cdylib|staticlib]
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Comma separated list of types of crates for the compiler to emit.
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.TP
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\fB\-\-crate\-name\fR \fINAME\fR
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Specify the name of the crate being built.
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.TP
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\fB\-\-emit\fR [asm|llvm\-bc|llvm\-ir|obj|link|dep\-info|mir][=\fIPATH\fR]
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Configure the output that \fBrustc\fR will produce. Each emission may also have
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an optional explicit output \fIPATH\fR specified for that particular emission
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kind. This path takes precedence over the \fB-o\fR option.
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.TP
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\fB\-\-print\fR [crate\-name|\:file\-names|\:sysroot|\:cfg|\:target\-list|\:target\-cpus|\:target\-features|\:relocation\-models|\:code\-models|\:tls\-models|\:target\-spec\-json|\:native\-static\-libs]
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Comma separated list of compiler information to print on stdout.
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.TP
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\fB\-g\fR
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Equivalent to \fI\-C\ debuginfo=2\fR.
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.TP
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\fB\-O\fR
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Equivalent to \fI\-C\ opt\-level=2\fR.
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.TP
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\fB\-o\fR \fIFILENAME\fR
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Write output to \fIFILENAME\fR. Ignored if multiple \fI\-\-emit\fR outputs are specified which
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don't have an explicit path otherwise.
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.TP
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\fB\-\-out\-dir\fR \fIDIR\fR
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Write output to compiler\[hy]chosen filename in \fIDIR\fR. Ignored if \fI\-o\fR is specified.
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Defaults to the current directory.
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.TP
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\fB\-\-explain\fR \fIOPT\fR
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Provide a detailed explanation of an error message.
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.TP
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\fB\-\-test\fR
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Build a test harness.
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.TP
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\fB\-\-target\fR \fITARGET\fR
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Target triple for which the code is compiled. This option defaults to the host’s target
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triple. The target triple has the general format <arch><sub>\-<vendor>\-<sys>\-<abi>, where:
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.RS
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.TP
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.B <arch>
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x86, arm, thumb, mips, etc.
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.TP
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.B <sub>
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for example on ARM: v5, v6m, v7a, v7m, etc.
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.TP
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.B <vendor>
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pc, apple, nvidia, ibm, etc.
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.TP
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.B <sys>
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none, linux, win32, darwin, cuda, etc.
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.TP
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.B <abi>
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eabi, gnu, android, macho, elf, etc.
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.RE
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.TP
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\fB\-W help\fR
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Print 'lint' options and default settings.
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.TP
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\fB\-W\fR \fIOPT\fR, \fB\-\-warn\fR \fIOPT\fR
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Set lint warnings.
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.TP
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\fB\-A\fR \fIOPT\fR, \fB\-\-allow\fR \fIOPT\fR
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Set lint allowed.
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.TP
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\fB\-D\fR \fIOPT\fR, \fB\-\-deny\fR \fIOPT\fR
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Set lint denied.
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.TP
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\fB\-F\fR \fIOPT\fR, \fB\-\-forbid\fR \fIOPT\fR
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Set lint forbidden.
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.TP
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\fB\-C\fR \fIFLAG\fR[=\fIVAL\fR], \fB\-\-codegen\fR \fIFLAG\fR[=\fIVAL\fR]
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Set a codegen\[hy]related flag to the value specified.
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Use \fI\-C help\fR to print available flags.
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See CODEGEN OPTIONS below.
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.TP
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\fB\-V\fR, \fB\-\-version\fR
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Print version info and exit.
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.TP
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\fB\-v\fR, \fB\-\-verbose\fR
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Use verbose output.
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.TP
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\fB\-\-remap\-path\-prefix\fR \fIfrom\fR=\fIto\fR
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Remap source path prefixes in all output, including compiler diagnostics, debug information,
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macro expansions, etc. The \fIfrom\fR=\fIto\fR parameter is scanned from right to left, so \fIfrom\fR
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may contain '=', but \fIto\fR may not.
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This is useful for normalizing build products, for example by removing the current directory out of
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pathnames emitted into the object files. The replacement is purely textual, with no consideration of
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the current system's pathname syntax. For example \fI\-\-remap\-path\-prefix foo=bar\fR will
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match \fBfoo/lib.rs\fR but not \fB./foo/lib.rs\fR.
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.TP
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\fB\-\-extern\fR \fINAME\fR=\fIPATH\fR
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Specify where an external rust library is located. These should match
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\fIextern\fR declarations in the crate's source code.
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.TP
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\fB\-\-sysroot\fR \fIPATH\fR
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Override the system root.
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.TP
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\fB\-Z\fR \fIFLAG\fR
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Set internal debugging options.
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Use \fI\-Z help\fR to print available options.
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.TP
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\fB\-\-color\fR auto|always|never
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Configure coloring of output:
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.RS
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.TP
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.B auto
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colorize, if output goes to a tty (default);
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.TP
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.B always
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always colorize output;
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.TP
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.B never
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never colorize output.
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.RE
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.SH CODEGEN OPTIONS
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.TP
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\fBlinker\fR=\fI/path/to/cc\fR
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Path to the linker utility to use when linking libraries, executables, and
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objects.
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.TP
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\fBlink\-args\fR='\fI\-flag1 \-flag2\fR'
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A space\[hy]separated list of extra arguments to pass to the linker when the linker
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is invoked.
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.TP
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\fBlto\fR
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Perform LLVM link\[hy]time optimizations.
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.TP
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\fBtarget\-cpu\fR=\fIhelp\fR
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Selects a target processor.
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If the value is 'help', then a list of available CPUs is printed.
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.TP
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\fBtarget\-feature\fR='\fI+feature1\fR,\fI\-feature2\fR'
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A comma\[hy]separated list of features to enable or disable for the target.
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A preceding '+' enables a feature while a preceding '\-' disables it.
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Available features can be discovered through \fIllc -mcpu=help\fR.
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.TP
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\fBpasses\fR=\fIval\fR
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A space\[hy]separated list of extra LLVM passes to run.
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A value of 'list' will cause \fBrustc\fR to print all known passes and
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exit.
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The passes specified are appended at the end of the normal pass manager.
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.TP
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\fBllvm\-args\fR='\fI\-arg1\fR \fI\-arg2\fR'
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A space\[hy]separated list of arguments to pass through to LLVM.
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.TP
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\fBsave\-temps\fR
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If specified, the compiler will save more files (.bc, .o, .no\-opt.bc) generated
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throughout compilation in the output directory.
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.TP
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\fBrpath\fR
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If specified, then the rpath value for dynamic libraries will be set in
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either dynamic library or executable outputs.
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.TP
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\fBno\-prepopulate\-passes\fR
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Suppresses pre\[hy]population of the LLVM pass manager that is run over the module.
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.TP
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\fBno\-vectorize\-loops\fR
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Suppresses running the loop vectorization LLVM pass, regardless of optimization
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level.
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.TP
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\fBno\-vectorize\-slp\fR
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Suppresses running the LLVM SLP vectorization pass, regardless of optimization
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level.
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.TP
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\fBsoft\-float\fR
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Generates software floating point library calls instead of hardware
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instructions.
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.TP
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\fBprefer\-dynamic\fR
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Prefers dynamic linking to static linking.
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.TP
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\fBno\-integrated\-as\fR
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Force usage of an external assembler rather than LLVM's integrated one.
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.TP
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\fBno\-redzone\fR
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Disable the use of the redzone.
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.TP
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\fBrelocation\-model\fR=[pic,static,dynamic\-no\-pic]
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The relocation model to use.
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(Default: \fIpic\fR)
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.TP
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\fBcode\-model\fR=[small,kernel,medium,large]
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Choose the code model to use.
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.TP
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\fBmetadata\fR=\fIval\fR
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Metadata to mangle symbol names with.
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.TP
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\fBextra\-filename\fR=\fIval\fR
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Extra data to put in each output filename.
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.TP
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\fBcodegen\-units\fR=\fIn\fR
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Divide crate into \fIn\fR units to optimize in parallel.
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.TP
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\fBremark\fR=\fIval\fR
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Print remarks for these optimization passes (space separated, or "all").
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.TP
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\fBno\-stack\-check\fR
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Disable checks for stack exhaustion (a memory\[hy]safety hazard!).
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.TP
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\fBdebuginfo\fR=\fIval\fR
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Debug info emission level:
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.RS
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.TP
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.B 0
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no debug info;
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.TP
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.B 1
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line\[hy]tables only (for stacktraces and breakpoints);
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.TP
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.B 2
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full debug info with variable and type information.
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.RE
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.TP
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\fBopt\-level\fR=\fIVAL\fR
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Optimize with possible levels 0\[en]3, s (optimize for size), or z (for minimal size)
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.SH ENVIRONMENT
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Some of these affect only test harness programs (generated via rustc --test);
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others affect all programs which link to the Rust standard library.
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.TP
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\fBRUST_TEST_THREADS\fR
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The test framework Rust provides executes tests in parallel. This variable sets
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the maximum number of threads used for this purpose. This setting is overridden
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by the --test-threads option.
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.TP
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\fBRUST_TEST_NOCAPTURE\fR
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If set to a value other than "0", a synonym for the --nocapture flag.
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.TP
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\fBRUST_MIN_STACK\fR
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Sets the minimum stack size for new threads.
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.TP
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\fBRUST_BACKTRACE\fR
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If set to a value different than "0", produces a backtrace in the output of a program which panics.
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.SH "EXAMPLES"
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To build an executable from a source file with a main function:
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$ rustc \-o hello hello.rs
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To build a library from a source file:
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$ rustc \-\-crate\-type=lib hello\-lib.rs
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To build either with a crate (.rs) file:
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$ rustc hello.rs
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To build an executable with debug info:
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$ rustc \-g \-o hello hello.rs
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.SH "SEE ALSO"
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.BR rustdoc (1)
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.SH "BUGS"
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See https://github.com/rust\-lang/rust/issues for issues.
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.SH "AUTHOR"
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See https://github.com/rust\-lang/rust/graphs/contributors or use `git log --all --format='%cN <%cE>' | sort -u` in the rust source distribution.
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.SH "COPYRIGHT"
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This work is dual\[hy]licensed under Apache\ 2.0 and MIT terms.
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See \fICOPYRIGHT\fR file in the rust source distribution.
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