Rollup merge of #59680 - DevQps:document-rustc-z-flag, r=cramertj
Document the -Z flag to the rustc book # Description Changes: - Added new documentation on the `-Z` flag of rustc in the command-line arguments section of the rustc book. If I need to rephrase anything or if you have any improvements, please let me know! I deliberately did not create an exhaustive list of all options since they are likely to change over time and per toolchain version. closes #41142
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2 changed files with 9 additions and 2 deletions
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@ -86,6 +86,13 @@ This flag will set which lints should be set to the [deny level](lints/levels.ht
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This flag will set which lints should be set to the [forbid level](lints/levels.html#forbid).
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## `-Z`: set unstable options
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This flag will allow you to set unstable options of rustc. In order to set multiple options,
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the -Z flag can be used multiple times. For example: `rustc -Z verbose -Z time`.
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Specifying options with -Z is only available on nightly. To view all available options
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run: `rustc -Z help`.
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## `--cap-lints`: set the most restrictive lint level
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This flag lets you 'cap' lints, for more, [see here](lints/levels.html#capping-lints).
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@ -744,7 +744,7 @@ fn usage(verbose: bool, include_unstable_options: bool) {
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}
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let message = "Usage: rustc [OPTIONS] INPUT";
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let nightly_help = if nightly_options::is_nightly_build() {
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"\n -Z help Print internal options for debugging rustc"
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"\n -Z help Print unstable compiler options"
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} else {
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""
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};
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@ -892,7 +892,7 @@ Available lint options:
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}
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fn describe_debug_flags() {
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println!("\nAvailable debug options:\n");
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println!("\nAvailable options:\n");
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print_flag_list("-Z", config::DB_OPTIONS);
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}
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