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Add workaround to detect correct compiler version #35811

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Aug 20, 2016
Merged

Add workaround to detect correct compiler version #35811

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8 changes: 7 additions & 1 deletion src/bootstrap/bin/rustc.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -38,13 +38,19 @@ fn main() {
// is passed (a bit janky...)
let target = args.windows(2).find(|w| &*w[0] == "--target")
.and_then(|w| w[1].to_str());
let version = args.iter().find(|w| &**w == "-vV");

// Build scripts always use the snapshot compiler which is guaranteed to be
// able to produce an executable, whereas intermediate compilers may not
// have the standard library built yet and may not be able to produce an
// executable. Otherwise we just use the standard compiler we're
// bootstrapping with.
let (rustc, libdir) = if target.is_none() {
//
// Also note that cargo will detect the version of the compiler to trigger
// a rebuild when the compiler changes. If this happens, we want to make
// sure to use the actual compiler instead of the snapshot compiler becase
// that's the one that's actually changing.
let (rustc, libdir) = if target.is_none() && version.is_none() {
("RUSTC_SNAPSHOT", "RUSTC_SNAPSHOT_LIBDIR")
} else {
("RUSTC_REAL", "RUSTC_LIBDIR")
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