Auto merge of #65167 - hermitcore:rusty-hermit, r=alexcrichton

Redesign the interface to the unikernel HermitCore

We are developing the unikernel HermitCore, where the kernel is written in Rust and is already part of the Rust Standard Library. The interface between the standard library and the kernel based on a small C library. With this pull request, we remove completely the dependency to C and use lld as linker. Currently, the kernel will be linked to the application as static library, which is published at https://github.com/hermitcore/libhermit-rs.

We don’t longer support the C interface to the kernel. Consequently, we remove this part from the Rust Standard Library.

Author: bors

Cargo.lock

@@ -1328,6 +1328,17 @@ dependencies = [
  "unicode-segmentation",
 ]
 
+[[package]]
+name = "hermit-abi"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f22b8f315b98f415780ddbe9163c7dbbc5a07225b6d102ace1d8aeef85775140"
+dependencies = [
+ "compiler_builtins",
+ "libc",
+ "rustc-std-workspace-core",
+]
+
 [[package]]
 name = "hex"
 version = "0.3.2"
@@ -4159,6 +4170,7 @@ dependencies = [
  "dlmalloc",
  "fortanix-sgx-abi",
  "hashbrown 0.6.2",
+ "hermit-abi",
  "libc",
  "panic_abort",
  "panic_unwind",

src/bootstrap/lib.rs

@@ -160,7 +160,7 @@ mod job {
     }
 }
 
-#[cfg(any(target_os = "haiku", not(any(unix, windows))))]
+#[cfg(any(target_os = "haiku", target_os = "hermit", not(any(unix, windows))))]
 mod job {
     pub unsafe fn setup(_build: &mut crate::Build) {
     }