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Add a note about rustflags compatibility.
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@ -349,6 +349,12 @@ Without `--target`, the flags will be passed to all compiler invocations
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you have args that you do not want to pass to build scripts or proc macros and
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are building for the host, pass `--target` with the host triple.
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> **Caution**: Due to the low-level nature of passing flags directly to the
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> compiler, this may cause a conflict with future versions of Cargo which may
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> issue the same or similar flags on its own which may interfere with the
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> flags you specify. This is an area where Cargo may not always be backwards
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> compatible.
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##### `build.rustdocflags`
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* Type: string or array of strings
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* Default: none
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