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Set RUSTC_BOOTSTRAP to some value.
Environment variables on windows can't be empty.
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@ -372,7 +372,7 @@ CFG_INFO := $(info cfg: disabling unstable features (CFG_DISABLE_UNSTABLE_FEATUR
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# Turn on feature-staging
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export CFG_DISABLE_UNSTABLE_FEATURES
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# Subvert unstable feature lints to do the self-build
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export RUSTC_BOOTSTRAP
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export RUSTC_BOOTSTRAP=1
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endif
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ifdef CFG_MUSL_ROOT
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export CFG_MUSL_ROOT
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@ -873,7 +873,7 @@ fn add_rustc_lib_path(&self, compiler: &Compiler, cmd: &mut Command) {
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/// Adds the compiler's bootstrap key to the environment of `cmd`.
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fn add_bootstrap_key(&self, cmd: &mut Command) {
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cmd.env("RUSTC_BOOTSTRAP", "");
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cmd.env("RUSTC_BOOTSTRAP", "1");
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// FIXME: Transitionary measure to bootstrap using the old bootstrap logic.
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// Remove this once the bootstrap compiler uses the new login in Issue #36548.
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cmd.env("RUSTC_BOOTSTRAP_KEY", "62b3e239");
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