add a WARNING to rust.optimize option in config.toml.example
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@ -258,10 +258,9 @@
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[rust]
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# Whether or not to optimize the compiler and standard library.
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#
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# Note: the slowness of the non optimized compiler compiling itself usually
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# outweighs the time gains in not doing optimizations, therefore a
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# full bootstrap takes much more time with `optimize` set to false.
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# WARNING: Building with optimize = false is NOT SUPPORTED. Due to bootstrapping,
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# building without optimizations takes much longer than optimizing. Further, some platforms
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# fail to build without this optimization (c.f. #65352).
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#optimize = true
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# Indicates that the build should be configured for debugging Rust. A
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