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Man Pages


Manual Reference Pages  -  RUSTC (1)

NAME

rustc - The Rust compiler

CONTENTS

Synopsis
Description
Options
Codegen Options
Environment

SYNOPSIS

rustc [OPTIONS] INPUT

DESCRIPTION

This program is a compiler for the Rust language, available at https://www.rust-lang.org.

OPTIONS

-h, --help Display the help message.
--cfg SPEC
  Configure the compilation environment.
-L [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)
-l [KIND=]NAME
  Link the generated crate(s) to the specified library NAME. The optional KIND can be one of static, dylib, or framework. If omitted, dylib is assumed.
--crate-type [bin|lib|rlib|dylib|staticlib]
  Comma separated list of types of crates for the compiler to emit.
--crate-name NAME
  Specify the name of the crate being built.
--emit [asm|llvm-bc|llvm-ir|obj|link|dep-info][=PATH]
  Configure the output that rustc will produce. Each emission may also have an optional explicit output PATH specified for that particular emission kind. This path takes precedence over the -o option.
--print [crate-name|file-names|sysroot]
  Comma separated list of compiler information to print on stdout.
-g Equivalent to -C debuginfo=2.
-O Equivalent to -C opt-level=2.
-o FILENAME
  Write output to FILENAME. Ignored if multiple --emit outputs are specified which don’t have an explicit path otherwise.
--out-dir DIR
  Write output to compiler[hy]chosen filename in DIR. Ignored if -o is specified. Defaults to the current directory.
--explain OPT
  Provide a detailed explanation of an error message.
--test Build a test harness.
--target TARGET
  Target triple for which the code is compiled. This option defaults to the host’s target triple. The target triple has the general format <arch><sub>-<vendor>-<sys>-<abi>, where:
<arch> x86, arm, thumb, mips, etc.
<sub> for example on ARM: v5, v6m, v7a, v7m, etc.
<vendor>
  pc, apple, nvidia, ibm, etc.
<sys> none, linux, win32, darwin, cuda, etc.
<abi> eabi, gnu, android, macho, elf, etc.
-W help Print ’lint’ options and default settings.
-W OPT, --warn OPT
  Set lint warnings.
-A OPT, --allow OPT
  Set lint allowed.
-D OPT, --deny OPT
  Set lint denied.
-F OPT, --forbid OPT
  Set lint forbidden.
-C FLAG[=VAL], --codegen FLAG[=VAL]
  Set a codegen[hy]related flag to the value specified. Use -C help to print available flags. See CODEGEN OPTIONS below.
-V, --version
  Print version info and exit.
-v, --verbose
  Use verbose output.
--extern NAME=PATH
  Specify where an external rust library is located. These should match extern declarations in the crate’s source code.
--sysroot PATH
  Override the system root.
-Z FLAG Set internal debugging options. Use -Z help to print available options.
--color auto|always|never
  Configure coloring of output:
auto colorize, if output goes to a tty (default);
always always colorize output;
never never colorize output.

CODEGEN OPTIONS

ar=/path/to/ar
  Path to the archive utility to use when assembling archives.
linker=/path/to/cc
  Path to the linker utility to use when linking libraries, executables, and objects.
link-args=’-flag1 -flag2
  A space[hy]separated list of extra arguments to pass to the linker when the linker is invoked.
lto Perform LLVM link[hy]time optimizations.
target-cpu=help
  Selects a target processor. If the value is ’help’, then a list of available CPUs is printed.
target-feature=’+feature1,-feature2
  A comma[hy]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 llc -mcpu=help.
passes=val
  A space[hy]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.
llvm-args=’-arg1 -arg2
  A space[hy]separated list of arguments to pass through to LLVM.
save-temps
  If specified, the compiler will save more files (.bc, .o, .no-opt.bc) generated throughout compilation in the output directory.
rpath If specified, then the rpath value for dynamic libraries will be set in either dynamic library or executable outputs.
no-prepopulate-passes
  Suppresses pre[hy]population of the LLVM pass manager that is run over the module.
no-vectorize-loops
  Suppresses running the loop vectorization LLVM pass, regardless of optimization level.
no-vectorize-slp
  Suppresses running the LLVM SLP vectorization pass, regardless of optimization level.
soft-float
  Generates software floating point library calls instead of hardware instructions.
prefer-dynamic
  Prefers dynamic linking to static linking.
no-integrated-as
  Force usage of an external assembler rather than LLVM’s integrated one.
no-redzone
  Disable the use of the redzone.
relocation-model=[pic,static,dynamic-no-pic]
  The relocation model to use. (Default: pic)
code-model=[small,kernel,medium,large]
  Choose the code model to use.
metadata=val
  Metadata to mangle symbol names with.
extra-filename=val
  Extra data to put in each output filename.
codegen-units=n
  Divide crate into n units to optimize in parallel.
remark=val
  Print remarks for these optimization passes (space separated, or "all").
no-stack-check
  Disable checks for stack exhaustion (a memory[hy]safety hazard!).
debuginfo=val
  Debug info emission level:
0 no debug info;
1 line[hy]tables only (for stacktraces and breakpoints);
2 full debug info with variable and type information.
opt-level=VAL
  Optimize with possible levels 0[en]3

ENVIRONMENT

Some of these affect the output of the compiler, while others affect programs which link to the standard library.

RUST_TEST_THREADS
  The test framework Rust provides executes tests in parallel. This variable sets the maximum number of threads used for this purpose.

RUST_TEST_NOCAPTURE
  A synonym for the --nocapture flag.

RUST_MIN_STACK
  Sets the minimum stack size for new threads.

RUST_BACKTRACE
  If set, produces a backtrace in the output of a program which panics.

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

SEE ALSO

rustdoc(1)

BUGS

See https://github.com/rust-lang/rust/issues for issues.

AUTHOR

See AUTHORS.txt in the Rust source distribution.

COPYRIGHT

This work is dual[hy]licensed under Apache 2.0 and MIT terms. See COPYRIGHT file in the rust source distribution.
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rustc 1.2.0 RUSTC (1) August 2015

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