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type-layout: mention that call ABI compatibility is a separate concern #1608

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Sep 17, 2024
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type-layout: mention that call ABI compatibility is a separate concern #1608

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5 changes: 5 additions & 0 deletions src/type-layout.md
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Expand Up @@ -7,6 +7,10 @@ of type layout.
Type layout can be changed with each compilation. Instead of trying to document
exactly what is done, we only document what is guaranteed today.

Note that even types with the same layout can still differ in how they are passed
across function boundaries. For function call ABI compatibility of types,
see [here][fn-abi-compatibility].

## Size and Alignment

All values have an alignment and size.
Expand Down Expand Up @@ -593,6 +597,7 @@ used with any other representation.
[`Copy`]: std::marker::Copy
[dynamically sized types]: dynamically-sized-types.md
[field-less enums]: items/enumerations.md#field-less-enum
[fn-abi-compatibility]: ../core/primitive.fn.md#abi-compatibility
[enumerations]: items/enumerations.md
[zero-variant enums]: items/enumerations.md#zero-variant-enums
[undefined behavior]: behavior-considered-undefined.md
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