Limit efiapi calling convention to supported arches

compiler/rustc_target/src/spec/mod.rs

@@ -1941,8 +1941,10 @@ impl Target {
             | PlatformIntrinsic
             | Unadjusted
             | Cdecl { .. }
-            | EfiApi
             | RustCold => true,
+            EfiApi => {
+                ["arm", "aarch64", "riscv32", "riscv64", "x86", "x86_64"].contains(&&self.arch[..])
+            }
             X86Interrupt => ["x86", "x86_64"].contains(&&self.arch[..]),
             Aapcs { .. } => "arm" == self.arch,
             CCmseNonSecureCall => ["arm", "aarch64"].contains(&&self.arch[..]),

src/test/ui/feature-gates/feature-gate-abi-efiapi.rs

@@ -0,0 +1,33 @@
+// needs-llvm-components: x86
+// compile-flags: --target=x86_64-unknown-linux-gnu --crate-type=rlib
+#![no_core]
+#![feature(no_core, lang_items)]
+#[lang="sized"]
+trait Sized { }
+
+// Functions
+extern "efiapi" fn f1() {} //~ ERROR efiapi ABI is experimental
+
+// Methods in trait defintion
+trait Tr {
+    extern "efiapi" fn f2(); //~ ERROR efiapi ABI is experimental
+    extern "efiapi" fn f3() {} //~ ERROR efiapi ABI is experimental
+}
+
+struct S;
+
+// Methods in trait impl
+impl Tr for S {
+    extern "efiapi" fn f2() {} //~ ERROR efiapi ABI is experimental
+}
+
+// Methods in inherent impl
+impl S {
+    extern "efiapi" fn f4() {} //~ ERROR efiapi ABI is experimental
+}
+
+// Function pointer types
+type A = extern "efiapi" fn(); //~ ERROR efiapi ABI is experimental
+
+// Foreign modules
+extern "efiapi" {} //~ ERROR efiapi ABI is experimental

src/test/ui/feature-gates/feature-gate-abi-efiapi.stderr

@@ -0,0 +1,66 @@
+error[E0658]: efiapi ABI is experimental and subject to change
+  --> $DIR/feature-gate-abi-efiapi.rs:9:8
+   |
+LL | extern "efiapi" fn f1() {}
+   |        ^^^^^^^^
+   |
+   = note: see issue #65815 <https://github.com/rust-lang/rust/issues/65815> for more information
+   = help: add `#![feature(abi_efiapi)]` to the crate attributes to enable
+
+error[E0658]: efiapi ABI is experimental and subject to change
+  --> $DIR/feature-gate-abi-efiapi.rs:13:12
+   |
+LL |     extern "efiapi" fn f2();
+   |            ^^^^^^^^
+   |
+   = note: see issue #65815 <https://github.com/rust-lang/rust/issues/65815> for more information
+   = help: add `#![feature(abi_efiapi)]` to the crate attributes to enable
+
+error[E0658]: efiapi ABI is experimental and subject to change
+  --> $DIR/feature-gate-abi-efiapi.rs:14:12
+   |
+LL |     extern "efiapi" fn f3() {}
+   |            ^^^^^^^^
+   |
+   = note: see issue #65815 <https://github.com/rust-lang/rust/issues/65815> for more information
+   = help: add `#![feature(abi_efiapi)]` to the crate attributes to enable
+
+error[E0658]: efiapi ABI is experimental and subject to change
+  --> $DIR/feature-gate-abi-efiapi.rs:21:12
+   |
+LL |     extern "efiapi" fn f2() {}
+   |            ^^^^^^^^
+   |
+   = note: see issue #65815 <https://github.com/rust-lang/rust/issues/65815> for more information
+   = help: add `#![feature(abi_efiapi)]` to the crate attributes to enable
+
+error[E0658]: efiapi ABI is experimental and subject to change
+  --> $DIR/feature-gate-abi-efiapi.rs:26:12
+   |
+LL |     extern "efiapi" fn f4() {}
+   |            ^^^^^^^^
+   |
+   = note: see issue #65815 <https://github.com/rust-lang/rust/issues/65815> for more information
+   = help: add `#![feature(abi_efiapi)]` to the crate attributes to enable
+
+error[E0658]: efiapi ABI is experimental and subject to change
+  --> $DIR/feature-gate-abi-efiapi.rs:30:17
+   |
+LL | type A = extern "efiapi" fn();
+   |                 ^^^^^^^^
+   |
+   = note: see issue #65815 <https://github.com/rust-lang/rust/issues/65815> for more information
+   = help: add `#![feature(abi_efiapi)]` to the crate attributes to enable
+
+error[E0658]: efiapi ABI is experimental and subject to change
+  --> $DIR/feature-gate-abi-efiapi.rs:33:8
+   |
+LL | extern "efiapi" {}
+   |        ^^^^^^^^
+   |
+   = note: see issue #65815 <https://github.com/rust-lang/rust/issues/65815> for more information
+   = help: add `#![feature(abi_efiapi)]` to the crate attributes to enable
+
+error: aborting due to 7 previous errors
+
+For more information about this error, try `rustc --explain E0658`.

src/test/ui/feature-gates/feature-gate-abi.rs

@@ -1,6 +1,5 @@
 // gate-test-intrinsics
 // gate-test-platform_intrinsics
-// gate-test-abi_efiapi
 // compile-flags: --crate-type=rlib
 
 #![feature(no_core, lang_items)]
@@ -18,7 +17,6 @@ extern "rust-intrinsic" fn f1() {} //~ ERROR intrinsics are subject to change
 extern "platform-intrinsic" fn f2() {} //~ ERROR platform intrinsics are experimental
                                        //~^ ERROR intrinsic must be in
 extern "rust-call" fn f4(_: ()) {} //~ ERROR rust-call ABI is subject to change
-extern "efiapi" fn f10() {} //~ ERROR efiapi ABI is experimental and subject to change
 
 // Methods in trait definition
 trait Tr {
@@ -27,10 +25,8 @@ trait Tr {
     extern "platform-intrinsic" fn m2(); //~ ERROR platform intrinsics are experimental
                                          //~^ ERROR intrinsic must be in
     extern "rust-call" fn m4(_: ()); //~ ERROR rust-call ABI is subject to change
-    extern "efiapi" fn m10(); //~ ERROR efiapi ABI is experimental and subject to change
 
     extern "rust-call" fn dm4(_: ()) {} //~ ERROR rust-call ABI is subject to change
-    extern "efiapi" fn dm10() {} //~ ERROR efiapi ABI is experimental and subject to change
 }
 
 struct S;
@@ -42,7 +38,6 @@ impl Tr for S {
     extern "platform-intrinsic" fn m2() {} //~ ERROR platform intrinsics are experimental
                                            //~^ ERROR intrinsic must be in
     extern "rust-call" fn m4(_: ()) {} //~ ERROR rust-call ABI is subject to change
-    extern "efiapi" fn m10() {} //~ ERROR efiapi ABI is experimental and subject to change
 }
 
 // Methods in inherent impl
@@ -52,17 +47,14 @@ impl S {
     extern "platform-intrinsic" fn im2() {} //~ ERROR platform intrinsics are experimental
                                             //~^ ERROR intrinsic must be in
     extern "rust-call" fn im4(_: ()) {} //~ ERROR rust-call ABI is subject to change
-    extern "efiapi" fn im10() {} //~ ERROR efiapi ABI is experimental and subject to change
 }
 
 // Function pointer types
 type A1 = extern "rust-intrinsic" fn(); //~ ERROR intrinsics are subject to change
 type A2 = extern "platform-intrinsic" fn(); //~ ERROR platform intrinsics are experimental
 type A4 = extern "rust-call" fn(_: ()); //~ ERROR rust-call ABI is subject to change
-type A10 = extern "efiapi" fn(); //~ ERROR efiapi ABI is experimental and subject to change
 
 // Foreign modules
 extern "rust-intrinsic" {} //~ ERROR intrinsics are subject to change
 extern "platform-intrinsic" {} //~ ERROR platform intrinsics are experimental
 extern "rust-call" {} //~ ERROR rust-call ABI is subject to change
-extern "efiapi" {} //~ ERROR efiapi ABI is experimental and subject to change