Merge from rust-lang/rust

1 files changed, 48 insertions, 0 deletions

diff --git a/compiler/rustc_codegen_gcc/example/alloc_example.rs b/compiler/rustc_codegen_gcc/example/alloc_example.rs
new file mode 100644
index 00000000000..6ed8b9157f2
--- /dev/null
+++ b/compiler/rustc_codegen_gcc/example/alloc_example.rs
@@ -0,0 +1,48 @@
+#![feature(start, core_intrinsics, alloc_error_handler, lang_items)]
+#![no_std]
+#![allow(internal_features)]
+
+extern crate alloc;
+extern crate alloc_system;
+
+use alloc::boxed::Box;
+
+use alloc_system::System;
+
+#[global_allocator]
+static ALLOC: System = System;
+
+#[link(name = "c")]
+extern "C" {
+    fn puts(s: *const u8) -> i32;
+}
+
+#[panic_handler]
+fn panic_handler(_: &core::panic::PanicInfo<'_>) -> ! {
+    core::intrinsics::abort();
+}
+
+#[alloc_error_handler]
+fn alloc_error_handler(_: alloc::alloc::Layout) -> ! {
+    core::intrinsics::abort();
+}
+
+#[lang = "eh_personality"]
+fn eh_personality() -> ! {
+    loop {}
+}
+
+#[no_mangle]
+unsafe extern "C" fn _Unwind_Resume() {
+    core::intrinsics::unreachable();
+}
+
+#[start]
+fn main(_argc: isize, _argv: *const *const u8) -> isize {
+    let world: Box<&str> = Box::new("Hello World!\0");
+    unsafe {
+        puts(*world as *const str as *const u8);
+    }
+
+    0
+}