Rollup merge of #48484 - glaubitz:powerpcspe-linux, r=alexcrichton

Add support for powerpc-unknown-linux-gnuspe

This PR adds support for the embedded PowerPC variant "e500". On Linux, this architecture is usually called "powerpcspe", it is a 32-bit PowerPC architecture. The main difference between normal 32-bit PowerPC and PowerPCSPE is the lack of Altivec instructions and the additional SPE instruction set.

This architecture is supported in Debian through an unofficial port.

src/bootstrap/native.rs

@@ -480,6 +480,7 @@ impl Step for Openssl {
             "mips64el-unknown-linux-gnuabi64" => "linux64-mips64",
             "mipsel-unknown-linux-gnu" => "linux-mips32",
             "powerpc-unknown-linux-gnu" => "linux-ppc",
+            "powerpc-unknown-linux-gnuspe" => "linux-ppc",
             "powerpc-unknown-netbsd" => "BSD-generic32",
             "powerpc64-unknown-linux-gnu" => "linux-ppc64",
             "powerpc64le-unknown-linux-gnu" => "linux-ppc64le",

src/librustc_back/target/mod.rs

@@ -143,6 +143,7 @@ supported_targets! {
     ("mips64el-unknown-linux-gnuabi64", mips64el_unknown_linux_gnuabi64),
     ("mipsel-unknown-linux-gnu", mipsel_unknown_linux_gnu),
     ("powerpc-unknown-linux-gnu", powerpc_unknown_linux_gnu),
+    ("powerpc-unknown-linux-gnuspe", powerpc_unknown_linux_gnuspe),
     ("powerpc64-unknown-linux-gnu", powerpc64_unknown_linux_gnu),
     ("powerpc64le-unknown-linux-gnu", powerpc64le_unknown_linux_gnu),
     ("s390x-unknown-linux-gnu", s390x_unknown_linux_gnu),

src/librustc_back/target/powerpc_unknown_linux_gnuspe.rs

@@ -0,0 +1,35 @@
+// 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 LinkerFlavor;
+use target::{Target, TargetResult};
+
+pub fn target() -> TargetResult {
+    let mut base = super::linux_base::opts();
+    base.pre_link_args.get_mut(&LinkerFlavor::Gcc).unwrap().push("-mspe".to_string());
+    base.max_atomic_width = Some(32);
+
+    // see #36994
+    base.exe_allocation_crate = None;
+
+    Ok(Target {
+        llvm_target: "powerpc-unknown-linux-gnuspe".to_string(),
+        target_endian: "big".to_string(),
+        target_pointer_width: "32".to_string(),
+        target_c_int_width: "32".to_string(),
+        data_layout: "E-m:e-p:32:32-i64:64-n32".to_string(),
+        arch: "powerpc".to_string(),
+        target_os: "linux".to_string(),
+        target_env: "gnu".to_string(),
+        target_vendor: "unknown".to_string(),
+        linker_flavor: LinkerFlavor::Gcc,
+        options: base,
+    })
+}

src/test/run-make/atomic-lock-free/Makefile

@@ -32,6 +32,8 @@ endif
 ifeq ($(filter powerpc,$(LLVM_COMPONENTS)),powerpc)
 	$(RUSTC) --target=powerpc-unknown-linux-gnu atomic_lock_free.rs
 	nm "$(TMPDIR)/libatomic_lock_free.rlib" | $(CGREP) -v __atomic_fetch_add
+	$(RUSTC) --target=powerpc-unknown-linux-gnuspe atomic_lock_free.rs
+	nm "$(TMPDIR)/libatomic_lock_free.rlib" | $(CGREP) -v __atomic_fetch_add
 	$(RUSTC) --target=powerpc64-unknown-linux-gnu atomic_lock_free.rs
 	nm "$(TMPDIR)/libatomic_lock_free.rlib" | $(CGREP) -v __atomic_fetch_add
 	$(RUSTC) --target=powerpc64le-unknown-linux-gnu atomic_lock_free.rs

src/tools/build-manifest/src/main.rs

@@ -83,6 +83,7 @@ static TARGETS: &'static [&'static str] = &[
     "mipsel-unknown-linux-gnu",
     "mipsel-unknown-linux-musl",
     "powerpc-unknown-linux-gnu",
+    "powerpc-unknown-linux-gnuspe",
     "powerpc64-unknown-linux-gnu",
     "powerpc64le-unknown-linux-gnu",
     "s390x-unknown-linux-gnu",