.TH RUSTC "1" "July 2013" "rustc 0.7" "User Commands"
.SH NAME
rustc \- 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\-\-crate-type=[bin|lib|dylib|rlib|staticlib]\fR
Configure the flavor of rust crate that is generated (default `bin`)
.TP
\fB\-\-cfg\fR SPEC
Configure the compilation environment
.TP
\fB\-\-emit=[asm,ir,bc,obj,link]\fR
Configure the output that rustc will produce
.TP
\fB\-h\fR, \fB\-\-help\fR
Display this message
.TP
\fB\-L\fR PATH
Add a directory to the library search path
.TP
\fB\-\-ls\fR
List the symbols defined by a library crate
.TP
\fB\-\-no\-trans\fR
Run all passes except translation; no output
.TP
\fB\-g\fR, \fB\-\-debuginfo\fR
Emit DWARF debug information into object files generated.
.TP
\fB\-O\fR
Equivalent to \fI\-\-opt\-level=2\fR
.TP
\fB\-o\fR FILENAME
Write output to <filename>. Ignored if more than one --emit is specified.
.TP
\fB\-\-opt\-level\fR LEVEL
Optimize with possible levels 0-3
.TP
\fB\-\-out\-dir\fR DIR
Write output to compiler-chosen filename in <dir>. Ignored if -o is specified.
(default the current directory)
.TP
\fB\-\-parse\-only\fR
Parse only; do not compile, assemble, or link
.TP
\fB\-\-pretty\fR [TYPE]
Pretty-print the input instead of compiling; valid types are: normal
(un-annotated source), expanded (crates expanded), typed (crates
expanded, with type annotations), or identified (fully parenthesized,
AST nodes and blocks with IDs)
.TP
\fB\-\-sysroot\fR PATH
Override the system root
.TP
\fB\-\-test\fR
Build a test harness
.TP
\fB\-\-target\fR TRIPLE
Target triple cpu-manufacturer-kernel[-os] to compile for (see
http://sources.redhat.com/autobook/autobook/autobook_17.html
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\-Z\fR FLAG
Set internal debugging options. Use "-Z help" to print available options.
.TP
\fB\-C\fR FLAG[=VAL], \fB\-\-codegen\fR FLAG[=VAL]
Set a codegen-related flag to the value specifie.d Use "-C help" to print
available flags. See CODEGEN OPTIONS below
.TP
\fB\-v\fR, \fB\-\-version\fR
Print version info and exit

.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
\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 space-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-separted list of argument 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
\fBandroid-cross-path\fR=path/to/ndk/bin
Directory to find the Android NDK cross-compilation tools
.TP
\fBno-rpath\fR
If specified, then the rpath value for dynamic libraries will not 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
\fBgen-crate-map\fR
Forces generate of a toplevel crate map. May be required for logging to work
when rust is embedded into another application.
.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.

.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/mozilla/rust/issues\fR> for issues.

.SH "AUTHOR"
See \fBAUTHORS.txt\fR in the rust source distribution. Graydon Hoare
<\fIgraydon@mozilla.com\fR> is the project leader.

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