Update rustc book CLI docs.
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Eric Huss
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@ -17,28 +17,147 @@ to `#[cfg(verbose)]` and `#[cfg(feature = "serde")]` respectively.
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## `-L`: add a directory to the library search path
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When looking for external crates, a directory passed to this flag will be searched.
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When looking for external crates or libraries, a directory passed to this flag
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will be searched.
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The kind of search path can optionally be specified with the form `-L
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KIND=PATH` where `KIND` may be one of:
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- `dependency` — Only search for transitive dependencies in this directory.
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- `crate` — Only search for this crate's direct dependencies in this
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directory.
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- `native` — Only search for native libraries in this directory.
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- `framework` — Only search for macOS frameworks in this directory.
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- `all` — Search for all library kinds in this directory. This is the default
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if `KIND` is not specified.
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## `-l`: link the generated crate to a native library
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This flag allows you to specify linking to a specific native library when building
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a crate.
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The kind of library can optionally be specified with the form `-l KIND=lib`
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where `KIND` may be one of:
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- `dylib` — A native dynamic library.
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- `static` — A native static library (such as a `.a` archive).
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- `framework` — A macOS framework.
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The kind of library can be specified in a [`#[link]`
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attribute][link-attribute]. If the kind is not specified in the `link`
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attribute or on the command-line, it will link a dynamic library if available,
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otherwise it will use a static library. If the kind is specified on the
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command-line, it will override the kind specified in a `link` attribute.
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The name used in a `link` attribute may be overridden using the form `-l
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ATTR_NAME:LINK_NAME` where `ATTR_NAME` is the name in the `link` attribute,
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and `LINK_NAME` is the name of the actual library that will be linked.
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[link-attribute]: ../reference/items/external-blocks.html#the-link-attribute
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## `--crate-type`: a list of types of crates for the compiler to emit
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This instructs `rustc` on which crate type to build.
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This instructs `rustc` on which crate type to build. This flag accepts a
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comma-separated list of values, and may be specified multiple times. The valid
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crate types are:
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- `lib` — Generates a library kind preferred by the compiler, currently
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defaults to `rlib`.
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- `rlib` — A Rust static library.
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- `staticlib` — A native static library.
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- `dylib` — A Rust dynamic library.
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- `cdylib` — A native dynamic library.
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- `bin` — A runnable executable program.
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- `proc-macro` — Generates a format suitable for a procedural macro library
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that may be loaded by the compiler.
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The crate type may be specified with the [`crate_type` attribute][crate_type].
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The `--crate-type` command-line value will override the `crate_type`
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attribute.
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More details may be found in the [linkage chapter] of the reference.
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[linkage chapter]: ../reference/linkage.html
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[crate_type]: ../reference/linkage.html
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## `--crate-name`: specify the name of the crate being built
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This informs `rustc` of the name of your crate.
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## `--emit`: emit output other than a crate
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## `--edition`: specify the edition to use
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Instead of producing a crate, this flag can print out things like the assembly or LLVM-IR.
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This flag takes a value of `2015` or `2018`. The default is `2015`. More
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information about editions may be found in the [edition guide].
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[edition guide]: ../edition-guide/introduction.html
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## `--emit`: specifies the types of output files to generate
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This flag controls the types of output files generated by the compiler. It
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accepts a comma-separated list of values, and may be specified multiple times.
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The valid emit kinds are:
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- `asm` — Generates a file with the crate's assembly code. The default output
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filename is `CRATE_NAME.s`.
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- `dep-info` — Generates a file with Makefile syntax that indicates all the
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source files that were loaded to generate the crate. The default output
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filename is `CRATE_NAME.d`.
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- `link` — Generates the crates specified by `--crate-type`. The default
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output filenames depend on the crate type and platform. This is the default
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if `--emit` is not specified.
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- `llvm-bc` — Generates a binary file containing the [LLVM bitcode]. The
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default output filename is `CRATE_NAME.bc`.
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- `llvm-ir` — Generates a file containing [LLVM IR]. The default output
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filename is `CRATE_NAME.ll`.
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- `metadata` — Generates a file containing metadata about the crate. The
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default output filename is `CRATE_NAME.rmeta`.
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- `mir` — Generates a file containing rustc's mid-level intermediate
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representation. The default output filename is `CRATE_NAME.mir`.
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- `obj` — Generates a native object file. The default output filename is
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`CRATE_NAME.o`.
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The output filename can be set with the `-o` flag. A suffix may be added to
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the filename with the `-C extra-filename` flag. The files are written to the
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current directory unless the `--out-dir` flag is used. Each emission type may
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also specify the output filename with the form `KIND=PATH`, which takes
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precedence over the `-o` flag.
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[LLVM bitcode]: https://llvm.org/docs/BitCodeFormat.html
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[LLVM IR]: https://llvm.org/docs/LangRef.html
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## `--print`: print compiler information
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This flag prints out various information about the compiler.
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This flag prints out various information about the compiler. This flag may be
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specified multiple times, and the information is printed in the order the
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flags are specified. Specifying a `--print` flag will usually disable the
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`--emit` step and will only print the requested information. The valid types
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of print values are:
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- `crate-name` — The name of the crate.
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- `file-names` — The names of the files created by the `link` emit kind.
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- `sysroot` — Path to the sysroot.
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- `cfg` — List of cfg values. See [conditional compilation] for more
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information about cfg values.
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- `target-list` — List of known targets. The target may be selected with the
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`--target` flag.
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- `target-cpus` — List of available CPU values for the current target. The
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target CPU may be selected with the `-C target-cpu=val` flag.
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- `target-features` — List of available target features for the current
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target. Target features may be enabled with the `-C target-feature=val`
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flag.
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- `relocation-models` — List of relocation models. Relocation models may be
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selected with the `-C relocation-model=val` flag.
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- `code-models` — List of code models. Code models may be selected with the
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`-C code-model=val` flag.
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- `tls-models` — List of Thread Local Storage models supported. The model may
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be selected with the `-Z tls-model=val` flag.
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- `native-static-libs` — This may be used when creating a `staticlib` crate
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type. If this is the only flag, it will perform a full compilation and
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include a diagnostic note that indicates the linker flags to use when
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linking the resulting static library. The note starts with the text
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`native-static-libs:` to make it easier to fetch the output.
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[conditional compilation]: ../reference/conditional-compilation.html
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## `-g`: include debug information
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@ -54,7 +173,8 @@ This flag controls the output filename.
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## `--out-dir`: directory to write the output in
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The outputted crate will be written to this directory.
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The outputted crate will be written to this directory. This flag is ignored if
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the `-o` flag is used.
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## `--explain`: provide a detailed explanation of an error message
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@ -111,8 +231,9 @@ This flag, when combined with other flags, makes them produce extra output.
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## `--extern`: specify where an external library is located
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This flag allows you to pass the name and location of an external crate that will
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be linked into the crate you're buildling.
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This flag allows you to pass the name and location of an external crate that
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will be linked into the crate you are building. This flag may be specified
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multiple times. The format of the value should be `CRATENAME=PATH`.
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## `--sysroot`: Override the system root
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@ -121,8 +242,32 @@ distribution; this flag allows that to be overridden.
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## `--error-format`: control how errors are produced
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This flag lets you control the format of errors.
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This flag lets you control the format of messages. Messages are printed to
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stderr. The valid options are:
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- `human` — Human-readable output. This is the default.
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- `json` — Structured JSON output.
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- `short` — Short, one-line messages.
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## `--color`: configure coloring of output
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This flag lets you control color settings of the output.
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This flag lets you control color settings of the output. The valid options
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are:
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- `auto` — Use colors if output goes to a tty. This is the default.
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- `always` — Always use colors.
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- `never` — Never colorize output.
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## `--remap-path-prefix`: remap source names in output
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Remap source path prefixes in all output, including compiler diagnostics,
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debug information, macro expansions, etc. It takes a value of the form
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`FROM=TO` where a path prefix equal to `FROM` is rewritten to the value `TO`.
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The `FROM` may itself contain an `=` symbol, but the `TO` value may not. This
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flag may be specified multiple times.
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This is useful for normalizing build products, for example by removing the
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current directory out of pathnames emitted into the object files. The
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replacement is purely textual, with no consideration of the current system's
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pathname syntax. For example `--remap-path-prefix foo=bar` will match
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`foo/lib.rs` but not `./foo/lib.rs`.
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@ -1744,8 +1744,7 @@ pub fn rustc_short_optgroups() -> Vec<RustcOptGroup> {
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opt::multi_s(
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"",
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"print",
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"Comma separated list of compiler information to \
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print on stdout",
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"Compiler information to print on stdout",
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"[crate-name|file-names|sysroot|cfg|target-list|\
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target-cpus|target-features|relocation-models|\
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code-models|tls-models|target-spec-json|native-static-libs]",
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