.TH RUSTC "1" "March 2014" "rustc 0.13.0" "User Commands"
.SH NAME
rustc \- The Rust compiler
.SH SYNOPSIS
.B rustc
[\fIOPTIONS\fR] \fIINPUT\fR

.SH DESCRIPTION
This program is a compiler for the Rust language, available at
<\fBhttps://www.rust-lang.org\fR>.

.SH OPTIONS

.TP
\fB\-h\fR, \fB\-\-help\fR
Display the help message
.TP
\fB\-\-cfg\fR SPEC
Configure the compilation environment
.TP
\fB\-L\fR [KIND=]PATH
Add a directory to the library search path. The optional KIND can be one of:
    dependency = only lookup transitive dependencies here
    crate = only lookup local `extern crate` directives here
    native = only lookup native libraries here
    framework = only look for OSX frameworks here
    all = look for anything here (the default)
.TP
\fB\-l\fR [KIND=]NAME
Link the generated crate(s) to the specified native library NAME. The optional
KIND can be one of, static, dylib, or framework. If omitted, dylib is assumed.
.TP
\fB\-\-crate-type\fR [bin|lib|rlib|dylib|staticlib]
Comma separated list of types of crates for the compiler to emit
.TP
\fB\-\-crate-name NAME\fR
Specify the name of the crate being built
.TP
\fB\-\-emit\fR [asm|llvm-bc|llvm-ir|obj|link|dep-info]
Configure the output that rustc will produce
.TP
\fB\-\-print\fR [crate-name|file-names|sysroot]
Comma separated list of compiler information to print on stdout
.TP
\fB\-g\fR
Equivalent to \fI\-C\fR debuginfo=2
.TP
\fB\-O\fR
Equivalent to \fI\-C\fR opt-level=2
.TP
\fB\-o\fR FILENAME
Write output to <filename>. Ignored if multiple \fI\-\-emit\fR outputs are
specified.
.TP
\fB\-\-out\-dir\fR DIR
Write output to compiler-chosen filename in <dir>. Ignored if \fI\-o\fR is
specified. Defaults to the current directory.
.TP
\fB\-\-explain\fR OPT
Provide a detailed explanation of an error message
.TP
\fB\-\-test\fR
Build a test harness
.TP
\fB\-\-target\fR TRIPLE
Target triple cpu-manufacturer-kernel[-os] to compile for (see chapter 3.4 of
http://www.sourceware.org/autobook/ for details)
.TP
\fB\-W\fR help
Print 'lint' options and default settings
.TP
\fB\-W\fR OPT, \fB\-\-warn\fR OPT
Set lint warnings
.TP
\fB\-A\fR OPT, \fB\-\-allow\fR OPT
Set lint allowed
.TP
\fB\-D\fR OPT, \fB\-\-deny\fR OPT
Set lint denied
.TP
\fB\-F\fR OPT, \fB\-\-forbid\fR OPT
Set lint forbidden
.TP
\fB\-C\fR FLAG[=VAL], \fB\-\-codegen\fR FLAG[=VAL]
Set a codegen-related flag to the value specified. Use "-C help" to print
available flags. See CODEGEN OPTIONS below
.TP
\fB\-V\fR, \fB\-\-version\fR
Print version info and exit
.TP
\fB\-v\fR, \fB\-\-verbose\fR
Use verbose output
.TP
\fB\-\-extern\fR NAME=PATH
Specify where an external rust library is located
.TP
\fB\-\-sysroot\fR PATH
Override the system root
.TP
\fB\-Z\fR FLAG
Set internal debugging options. Use "-Z help" to print available options.
.TP
\fB\-\-color\fR auto|always|never
Configure coloring of output:
    auto = colorize, if output goes to a tty (default);
    always = always colorize output;
    never = never colorize output

.SH CODEGEN OPTIONS

.TP
\fBar\fR=/path/to/ar
Path to the archive utility to use when assembling archives.
.TP
\fBlinker\fR=/path/to/cc
Path to the linker utility to use when linking libraries, executables, and
objects.
.TP
\fBlink-args\fR='-flag1 -flag2'
A space-separated list of extra arguments to pass to the linker when the linker
is invoked.
.TP
\fBlto\fR
Perform LLVM link-time optimizations.
.TP
\fBtarget-cpu\fR=help
Selects a target processor. If the value is 'help', then a list of available
CPUs is printed.
.TP
\fBtarget-feature\fR='+feature1,-feature2'
A comma-separated list of features to enable or disable for the target. A
preceding '+' enables a feature while a preceding '-' disables it. Available
features can be discovered through target-cpu=help.
.TP
\fBpasses\fR=list
A space-separated list of extra LLVM passes to run. A value of 'list' will
cause rustc to print all known passes and exit. The passes specified are
appended at the end of the normal pass manager.
.TP
\fBllvm-args\fR='-arg1 -arg2'
A space-separated list of arguments to pass through to LLVM.
.TP
\fBsave-temps\fR
If specified, the compiler will save more files (.bc, .o, .no-opt.bc) generated
throughout compilation in the output directory.
.TP
\fBrpath\fR
If specified, then the rpath value for dynamic libraries will be set in
either dynamic library or executable outputs.
.TP
\fBno-prepopulate-passes\fR
Suppresses pre-population of the LLVM pass manager that is run over the module.
.TP
\fBno-vectorize-loops\fR
Suppresses running the loop vectorization LLVM pass, regardless of optimization
level.
.TP
\fBno-vectorize-slp\fR
Suppresses running the LLVM SLP vectorization pass, regardless of optimization
level.
.TP
\fBsoft-float\fR
Generates software floating point library calls instead of hardware
instructions.
.TP
\fBprefer-dynamic\fR
Prefers dynamic linking to static linking.
.TP
\fBno-integrated-as\fR
Force usage of an external assembler rather than LLVM's integrated one.
.TP
\fBno-redzone\fR
Disable the use of the redzone.
.TP
\fBrelocation-model\fR=[pic,static,dynamic-no-pic]
The relocation model to use. (Default: pic)
.TP
\fBcode-model\fR=[small,kernel,medium,large]
Choose the code model to use.
.TP
\fBmetadata\fR=val
Metadata to mangle symbol names with.
.TP
\fBextra-filename\fR=val
Extra data to put in each output filename.
.TP
\fBcodegen-units\fR=val
Divide crate into N units to optimize in parallel.
.TP
\fBremark\fR=val
Print remarks for these optimization passes (space separated, or "all").
.TP
\fBno-stack-check\fR
Disable checks for stack exhaustion (a memory-safety hazard!).
.TP
\fBdebuginfo\fR=val
Debug info emission level:
    0 = no debug info;
    1 = line-tables only (for stacktraces and breakpoints);
    2 = full debug info with variable and type information.
.TP
\fBopt-level\fR=val
Optimize with possible levels 0-3

.SH "EXAMPLES"
To build an executable from a source file with a main function:
    $ rustc -o hello hello.rs

To build a library from a source file:
    $ rustc --crate-type=lib hello-lib.rs

To build either with a crate (.rs) file:
    $ rustc hello.rs

To build an executable with debug info:
    $ rustc -g -o hello hello.rs

.SH "SEE ALSO"

rustdoc

.SH "BUGS"
See <\fBhttps://github.com/rust-lang/rust/issues\fR> for issues.

.SH "AUTHOR"
See \fBAUTHORS.txt\fR in the Rust source distribution.

.SH "COPYRIGHT"
This work is dual-licensed under Apache 2.0 and MIT terms.  See \fBCOPYRIGHT\fR
file in the rust source distribution.