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add 'system' to variadic ABIs #2069

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add 'system' to variadic ABIs #2069

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3 changes: 2 additions & 1 deletion src/items/external-blocks.md
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Expand Up @@ -124,7 +124,7 @@ r[items.extern.abi.c]
* `unsafe extern "C"` --- The "C" ABI matches the default ABI chosen by the dominant C compiler for the target.

r[items.extern.abi.system]
* `unsafe extern "system"` --- This is equivalent to `extern "C"` except on Windows x86_32 where it is equivalent to `"stdcall"`.
* `unsafe extern "system"` --- This is equivalent to `extern "C"` except on Windows x86_32 where it is equivalent to `"stdcall"` for non-variadic functions, and equivalent to `"C"` for variadic functions.

> [!NOTE]
> As the correct underlying ABI on Windows is target-specific, it's best to use `extern "system"` when attempting to link Windows API functions that don't use an explicitly defined ABI.
Expand Down Expand Up @@ -257,6 +257,7 @@ Variadic parameters can only be specified within `extern` blocks with the follow
- `"C"`
- `"cdecl"`
- `"efiapi"`
- `"system"`
- `"sysv64"`
- `"win64"`

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