Add x86_64-fortanix-unknown-sgx target to the compiler

Author: Jethro Beekman

src/librustc_target/spec/mod.rs

@@ -412,6 +412,8 @@ supported_targets! {
     ("riscv32imac-unknown-none-elf", riscv32imac_unknown_none_elf),
 
     ("aarch64-unknown-none", aarch64_unknown_none),
+
+    ("x86_64-fortanix-unknown-sgx", x86_64_fortanix_unknown_sgx),
 }
 
 /// Everything `rustc` knows about how to compile for a specific target.

src/librustc_target/spec/x86_64_fortanix_unknown_sgx.rs

@@ -0,0 +1,72 @@
+// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use std::iter;
+
+use super::{LinkerFlavor, Target, TargetOptions, PanicStrategy};
+
+pub fn target() -> Result<Target, String> {
+    const PRE_LINK_ARGS: &[&str] = &[
+        "-Wl,--as-needed",
+        "-Wl,-z,noexecstack",
+        "-m64",
+         "-fuse-ld=gold",
+         "-nostdlib",
+         "-shared",
+         "-Wl,-e,sgx_entry",
+         "-Wl,-Bstatic",
+         "-Wl,--gc-sections",
+         "-Wl,-z,text",
+         "-Wl,-z,norelro",
+         "-Wl,--rosegment",
+         "-Wl,--no-undefined",
+         "-Wl,--error-unresolved-symbols",
+         "-Wl,--no-undefined-version",
+         "-Wl,-Bsymbolic",
+         "-Wl,--export-dynamic",
+    ];
+    const EXPORT_SYMBOLS: &[&str] = &[
+        "sgx_entry",
+        "HEAP_BASE",
+        "HEAP_SIZE",
+        "RELA",
+        "RELACOUNT",
+        "ENCLAVE_SIZE",
+        "CFGDATA_BASE",
+        "DEBUG",
+    ];
+    let opts = TargetOptions {
+        dynamic_linking: false,
+        executables: true,
+        linker_is_gnu: true,
+        max_atomic_width: Some(64),
+        panic_strategy: PanicStrategy::Abort,
+        cpu: "x86-64".into(),
+        position_independent_executables: true,
+        pre_link_args: iter::once(
+                (LinkerFlavor::Gcc, PRE_LINK_ARGS.iter().cloned().map(String::from).collect())
+        ).collect(),
+        override_export_symbols: Some(EXPORT_SYMBOLS.iter().cloned().map(String::from).collect()),
+        ..Default::default()
+    };
+    Ok(Target {
+        llvm_target: "x86_64-unknown-linux-gnu".into(),
+        target_endian: "little".into(),
+        target_pointer_width: "64".into(),
+        target_c_int_width: "32".into(),
+        target_os: "unknown".into(),
+        target_env: "sgx".into(),
+        target_vendor: "fortanix".into(),
+        data_layout: "e-m:e-i64:64-f80:128-n8:16:32:64-S128".into(),
+        arch: "x86_64".into(),
+        linker_flavor: LinkerFlavor::Gcc,
+        options: opts,
+    })
+}