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Implement keep-stage support

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This commit is contained in:
Mark Simulacrum 2017-07-14 09:28:06 -06:00
parent 681b12316c
commit fc3d06ac86
1 changed files with 13 additions and 1 deletions
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14
src/bootstrap/compile.rs
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@ -23,6 +23,7 @@ use std::io::prelude::*;
use std::path::{Path, PathBuf};
use std::process::{Command, Stdio};
use std::str;
use std::cmp::min;
use build_helper::{output, mtime, up_to_date};
use filetime::FileTime;
@ -846,7 +847,18 @@ impl Step for Assemble {
// link to these. (FIXME: Is that correct? It seems to be correct most
// of the time but I think we do link to these for stage2/bin compilers
// when not performing a full bootstrap).
builder.ensure(Rustc { compiler: build_compiler, target: target_compiler.host });
if builder.build.flags.keep_stage.map_or(false, |s| target_compiler.stage <= s) {
builder.verbose("skipping compilation of compiler due to --keep-stage");
let compiler = build_compiler;
for stage in 0..min(target_compiler.stage, builder.flags.keep_stage.unwrap()) {
let target_compiler = builder.compiler(stage, target_compiler.host);
builder.ensure(StdLink { compiler, target_compiler, target: target_compiler.host });
builder.ensure(TestLink { compiler, target_compiler, target: target_compiler.host });
builder.ensure(RustcLink { compiler, target_compiler, target: target_compiler.host });
}
} else {
builder.ensure(Rustc { compiler: build_compiler, target: target_compiler.host });
}
let stage = target_compiler.stage;
let host = target_compiler.host;