Auto merge of #42058 - froydnj:thiscall-support, r=nikomatsakis

add thiscall calling convention support

This support is needed for bindgen to work well on 32-bit Windows, and also enables people to begin experimenting with C++ FFI support on that platform.

Fixes #42044.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/libsyntax/feature_gate.rs b/src/libsyntax/feature_gate.rs
index 6ea8fab98aa..ca579409be4 100644
--- a/src/libsyntax/feature_gate.rs
+++ b/src/libsyntax/feature_gate.rs
@@ -352,6 +352,9 @@ declare_features! (
 
     // Allows use of the :vis macro fragment specifier
     (active, macro_vis_matcher, "1.18.0", Some(41022)),
+
+    // rustc internal
+    (active, abi_thiscall, "1.19.0", None),
 );
 
 declare_features! (
@@ -1054,6 +1057,10 @@ impl<'a> PostExpansionVisitor<'a> {
                 gate_feature_post!(&self, abi_vectorcall, span,
                                    "vectorcall is experimental and subject to change");
             },
+            Abi::Thiscall => {
+                gate_feature_post!(&self, abi_thiscall, span,
+                                   "thiscall is experimental and subject to change");
+            },
             Abi::RustCall => {
                 gate_feature_post!(&self, unboxed_closures, span,
                                    "rust-call ABI is subject to change");