rustbuild: Document what steps are
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@ -21,9 +21,23 @@ pub struct Step<'a> {
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macro_rules! targets {
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($m:ident) => {
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$m! {
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// Step representing building the stageN compiler. This is just the
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// compiler executable itself, not any of the support libraries
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(rustc, Rustc { stage: u32 }),
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// Steps for the two main cargo builds, one for the standard library
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// and one for the compiler itself. These are parameterized over the
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// stage output they're going to be placed in along with the
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// compiler which is producing the copy of libstd or librustc
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(libstd, Libstd { stage: u32, compiler: Compiler<'a> }),
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(librustc, Librustc { stage: u32, compiler: Compiler<'a> }),
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// Steps for long-running native builds. Ideally these wouldn't
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// actually exist and would be part of build scripts, but for now
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// these are here.
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//
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// There aren't really any parameters to this, but empty structs
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// with braces are unstable so we just pick something that works.
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(llvm, Llvm { _dummy: () }),
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(compiler_rt, CompilerRt { _dummy: () }),
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}
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