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Rollup merge of #136948 - workingjubilee:split-off-extern-system-varargs, r=compiler-errors

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Split out the `extern_system_varargs` feature

After the stabilization PR was opened, `extern "system"` functions were added to `extended_varargs_abi_support`. This has a number of questions regarding it that were not discussed and were somewhat surprising. It deserves to be considered as its own feature, separate from `extended_varargs_abi_support`.

Tracking issue:
- https://github.com/rust-lang/rust/issues/136946
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Jacob Pratt 2025-02-13 03:53:32 -05:00 • committed by GitHub
commit 36d37966df
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13 changed files with 63 additions and 53 deletions
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4
compiler/rustc_feature/src/unstable.rs
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@ -487,9 +487,11 @@ declare_features! (
(unstable, exhaustive_patterns, "1.13.0", Some(51085)),
/// Allows explicit tail calls via `become` expression.
(incomplete, explicit_tail_calls, "1.72.0", Some(112788)),
/// Allows using `efiapi`, `sysv64` and `win64` as calling convention
/// Allows using `aapcs`, `efiapi`, `sysv64` and `win64` as calling conventions
/// for functions with varargs.
(unstable, extended_varargs_abi_support, "1.65.0", Some(100189)),
/// Allows using `system` as a calling convention with varargs.
(unstable, extern_system_varargs, "CURRENT_RUSTC_VERSION", Some(136946)),
/// Allows defining `extern type`s.
(unstable, extern_types, "1.23.0", Some(43467)),
/// Allow using 128-bit (quad precision) floating point numbers.