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Rollup merge of #119587 - beepster4096:system_varargs, r=petrochenkov

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Varargs support for system ABI

This PR allows functions with the `system` ABI to be variadic (under the `extended_varargs_abi_support` feature tracked in #100189). On x86 windows, the `system` ABI is equivalent to `C` for variadic functions. On other platforms, `system` is already equivalent to `C`.

Fixes #110505
This commit is contained in:
Matthias Krüger 2024-01-13 15:10:28 +01:00 • committed by GitHub
commit 7b507db24b
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8 changed files with 34 additions and 13 deletions
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3
compiler/rustc_hir_analysis/src/lib.rs
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@ -116,7 +116,8 @@ use rustc_hir::def::DefKind;
rustc_fluent_macro::fluent_messages! { "../messages.ftl" }
fn require_c_abi_if_c_variadic(tcx: TyCtxt<'_>, decl: &hir::FnDecl<'_>, abi: Abi, span: Span) {
const CONVENTIONS_UNSTABLE: &str = "`C`, `cdecl`, `aapcs`, `win64`, `sysv64` or `efiapi`";
const CONVENTIONS_UNSTABLE: &str =
"`C`, `cdecl`, `system`, `aapcs`, `win64`, `sysv64` or `efiapi`";
const CONVENTIONS_STABLE: &str = "`C` or `cdecl`";
const UNSTABLE_EXPLAIN: &str =
"using calling conventions other than `C` or `cdecl` for varargs functions is unstable";