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Document the -Z flag to the rustc book #59680

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Merged
merged 3 commits into from
Apr 12, 2019
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Document the -Z flag to the rustc book #59680

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5c7a944
Add documentation on the -Z flag on the command-line arguments sectio…
Apr 3, 2019
7acfa45
Updated the documentation, now claiming the -Z is associated to unsta…
Apr 10, 2019
cdeb745
Updated the description of -Z in the rustc book.
Apr 10, 2019
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7 changes: 7 additions & 0 deletions src/doc/rustc/src/command-line-arguments.md
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Expand Up @@ -86,6 +86,13 @@ This flag will set which lints should be set to the [deny level](lints/levels.ht

This flag will set which lints should be set to the [forbid level](lints/levels.html#forbid).

## `-Z`: set unstable options

This flag will allow you to set unstable options of rustc. In order to set multiple options,
the -Z flag can be used multiple times. For example: `rustc -Z verbose -Z time`.
Specifying options with -Z is only available on nightly. To view all available options
run: `rustc -Z help`.

## `--cap-lints`: set the most restrictive lint level

This flag lets you 'cap' lints, for more, [see here](lints/levels.html#capping-lints).
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4 changes: 2 additions & 2 deletions src/librustc_driver/lib.rs
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Expand Up @@ -743,7 +743,7 @@ fn usage(verbose: bool, include_unstable_options: bool) {
}
let message = "Usage: rustc [OPTIONS] INPUT";
let nightly_help = if nightly_options::is_nightly_build() {
"\n -Z help Print internal options for debugging rustc"
"\n -Z help Print unstable compiler options"
} else {
""
};
Expand Down Expand Up @@ -891,7 +891,7 @@ Available lint options:
}

fn describe_debug_flags() {
println!("\nAvailable debug options:\n");
println!("\nAvailable options:\n");
print_flag_list("-Z", config::DB_OPTIONS);
}

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