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abi.md: clarify #[used] and linking #712

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Dec 16, 2019
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abi.md: clarify #[used] and linking #712

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5 changes: 3 additions & 2 deletions src/abi.md
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Expand Up @@ -10,8 +10,9 @@ linking external libraries.
## The `used` attribute

The *`used` attribute* can only be applied to [`static` items]. This [attribute] forces the
compiler to keep the variable in the output object file (.o, .rlib, etc.) even if the variable is
not used, or referenced, by any other item in the crate.
compiler to keep the variable in the output object file (.o, .rlib, etc. excluding final binaries)
even if the variable is not used, or referenced, by any other item in the crate.
However, the linker is still free to remove such an item.

Below is an example that shows under what conditions the compiler keeps a `static` item in the
output object file.
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