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Rollup merge of #110594 - infdahai:cfg_chore, r=jyn514

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`rustc --help` add `--cfg` SPEC declaration.

1. fixes #110462
2. add spec arguments based on https://doc.rust-lang.org/reference/conditional-compilation.html
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jyn 2023-04-26 01:55:52 -05:00 committed by GitHub
commit 62b5beaf93
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3
compiler/rustc_session/src/config.rs
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@ -1400,7 +1400,8 @@ The default is {DEFAULT_EDITION} and the latest stable edition is {LATEST_STABLE
pub fn rustc_short_optgroups() -> Vec<RustcOptGroup> {
vec![
opt::flag_s("h", "help", "Display this message"),
opt::multi_s("", "cfg", "Configure the compilation environment", "SPEC"),
opt::multi_s("", "cfg", "Configure the compilation environment.
SPEC supports the syntax `NAME[=\"VALUE\"]`.", "SPEC"),
opt::multi("", "check-cfg", "Provide list of valid cfg options for checking", "SPEC"),
opt::multi_s(
"L",