Auto merge of #45224 - malbarbo:x32, r=alexcrichton

Add x86_64-unknown-linux-gnux32 target

This adds X32 ABI support for Linux on X86_64. Let's package and dist it so we can star testing libc, libstd, etc.

Fixes https://github.com/rust-lang/rfcs/issues/1339

13 files changed, 65 insertions, 26 deletions

diff --git a/src/Cargo.lock b/src/Cargo.lock
index fe67a1655f1..aa5e262e85f 100644
--- a/src/Cargo.lock
+++ b/src/Cargo.lock
@@ -42,7 +42,7 @@ dependencies = [
  "alloc 0.0.0",
  "alloc_system 0.0.0",
  "build_helper 0.1.0",
- "cc 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "core 0.0.0",
  "libc 0.0.0",
 ]
@@ -99,7 +99,7 @@ name = "backtrace-sys"
 version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.31 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -136,7 +136,7 @@ name = "bootstrap"
 version = "0.0.0"
 dependencies = [
  "build_helper 0.1.0",
- "cc 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "cmake 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)",
  "filetime 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "getopts 0.2.15 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -246,7 +246,7 @@ version = "0.1.0"
 
 [[package]]
 name = "cc"
-version = "1.0.0"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -275,7 +275,7 @@ name = "cmake"
 version = "0.1.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -290,7 +290,7 @@ dependencies = [
 name = "compiler_builtins"
 version = "0.0.0"
 dependencies = [
- "cc 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "core 0.0.0",
 ]
 
@@ -407,7 +407,7 @@ name = "curl-sys"
 version = "0.3.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.31 (registry+https://github.com/rust-lang/crates.io-index)",
  "libz-sys 1.0.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "openssl-sys 0.9.19 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -833,7 +833,7 @@ name = "libgit2-sys"
 version = "0.6.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "cmake 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)",
  "curl-sys 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.31 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -860,7 +860,7 @@ name = "libz-sys"
 version = "1.0.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.31 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "vcpkg 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -880,7 +880,7 @@ name = "lzma-sys"
 version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "filetime 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.31 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -968,7 +968,7 @@ name = "miniz-sys"
 version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.31 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1104,7 +1104,7 @@ name = "openssl-sys"
 version = "0.9.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.31 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "vcpkg 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1208,7 +1208,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "profiler_builtins"
 version = "0.0.0"
 dependencies = [
- "cc 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "core 0.0.0",
 ]
 
@@ -1623,7 +1623,7 @@ version = "0.0.0"
 dependencies = [
  "bitflags 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "build_helper 0.1.0",
- "cc 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_cratesio_shim 0.0.0",
 ]
 
@@ -1755,7 +1755,7 @@ name = "rustc_trans"
 version = "0.0.0"
 dependencies = [
  "bitflags 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "cc 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "flate2 0.2.20 (registry+https://github.com/rust-lang/crates.io-index)",
  "jobserver 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1824,7 +1824,7 @@ name = "rustdoc"
 version = "0.0.0"
 dependencies = [
  "build_helper 0.1.0",
- "cc 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "html-diff 0.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1994,7 +1994,7 @@ dependencies = [
  "alloc_jemalloc 0.0.0",
  "alloc_system 0.0.0",
  "build_helper 0.1.0",
- "cc 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "collections 0.0.0",
  "compiler_builtins 0.0.0",
  "core 0.0.0",
@@ -2485,7 +2485,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum bitflags 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)" = "4efd02e230a02e18f92fc2735f44597385ed02ad8f831e7c1c1156ee5e1ab3a5"
 "checksum bitflags 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f5cde24d1b2e2216a726368b2363a273739c91f4e3eb4e0dd12d672d396ad989"
 "checksum bufstream 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "f2f382711e76b9de6c744cc00d0497baba02fb00a787f088c879f01d09468e32"
-"checksum cc 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7db2f146208d7e0fbee761b09cd65a7f51ccc38705d4e7262dad4d73b12a76b1"
+"checksum cc 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2c674f0870e3dbd4105184ea035acb1c32c8ae69939c9e228d2b11bbfe29efad"
 "checksum cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "d4c819a1287eb618df47cc647173c5c4c66ba19d888a6e50d605672aed3140de"
 "checksum clap 2.26.2 (registry+https://github.com/rust-lang/crates.io-index)" = "3451e409013178663435d6f15fdb212f14ee4424a3d74f979d081d0a66b6f1f2"
 "checksum cmake 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)" = "357c07e7a1fc95732793c1edb5901e1a1f305cfcf63a90eb12dbd22bdb6b789d"
diff --git a/src/bootstrap/Cargo.toml b/src/bootstrap/Cargo.toml
index 3f1d03b1872..bbbbf0e1915 100644
--- a/src/bootstrap/Cargo.toml
+++ b/src/bootstrap/Cargo.toml
@@ -34,7 +34,7 @@ cmake = "0.1.23"
 filetime = "0.1"
 num_cpus = "1.0"
 getopts = "0.2"
-cc = "1.0"
+cc = "1.0.1"
 libc = "0.2"
 serde = "1.0.8"
 serde_derive = "1.0.8"
diff --git a/src/ci/docker/cross2/Dockerfile b/src/ci/docker/cross2/Dockerfile
index f5fc06767ce..58932c51aec 100644
--- a/src/ci/docker/cross2/Dockerfile
+++ b/src/ci/docker/cross2/Dockerfile
@@ -5,6 +5,7 @@ RUN sh /scripts/cross-apt-packages.sh
 
 RUN apt-get build-dep -y clang llvm && apt-get install -y --no-install-recommends \
   build-essential \
+  gcc-multilib \
   libedit-dev \
   libgmp-dev \
   libisl-dev \
@@ -47,6 +48,7 @@ ENV TARGETS=x86_64-unknown-fuchsia
 ENV TARGETS=$TARGETS,aarch64-unknown-fuchsia
 ENV TARGETS=$TARGETS,sparcv9-sun-solaris
 ENV TARGETS=$TARGETS,x86_64-sun-solaris
+ENV TARGETS=$TARGETS,x86_64-unknown-linux-gnux32
 
 ENV RUST_CONFIGURE_ARGS --target=$TARGETS --enable-extended
 ENV SCRIPT python2.7 ../x.py dist --target $TARGETS
diff --git a/src/liballoc_jemalloc/Cargo.toml b/src/liballoc_jemalloc/Cargo.toml
index 4042c4d2d4e..6d7d83dd993 100644
--- a/src/liballoc_jemalloc/Cargo.toml
+++ b/src/liballoc_jemalloc/Cargo.toml
@@ -19,7 +19,7 @@ libc = { path = "../rustc/libc_shim" }
 
 [build-dependencies]
 build_helper = { path = "../build_helper" }
-cc = "1.0"
+cc = "1.0.1"
 
 [features]
 debug = []
diff --git a/src/libprofiler_builtins/Cargo.toml b/src/libprofiler_builtins/Cargo.toml
index eb31f5730d1..04f456917b9 100644
--- a/src/libprofiler_builtins/Cargo.toml
+++ b/src/libprofiler_builtins/Cargo.toml
@@ -15,4 +15,4 @@ doc = false
 core = { path = "../libcore" }
 
 [build-dependencies]
-cc = "1.0"
+cc = "1.0.1"
diff --git a/src/librustc_back/target/mod.rs b/src/librustc_back/target/mod.rs
index 79f8ce78831..a56d0678158 100644
--- a/src/librustc_back/target/mod.rs
+++ b/src/librustc_back/target/mod.rs
@@ -135,6 +135,7 @@ macro_rules! supported_targets {
 
 supported_targets! {
     ("x86_64-unknown-linux-gnu", x86_64_unknown_linux_gnu),
+    ("x86_64-unknown-linux-gnux32", x86_64_unknown_linux_gnux32),
     ("i686-unknown-linux-gnu", i686_unknown_linux_gnu),
     ("i586-unknown-linux-gnu", i586_unknown_linux_gnu),
     ("mips-unknown-linux-gnu", mips_unknown_linux_gnu),
diff --git a/src/librustc_back/target/x86_64_unknown_linux_gnux32.rs b/src/librustc_back/target/x86_64_unknown_linux_gnux32.rs
new file mode 100644
index 00000000000..70382032836
--- /dev/null
+++ b/src/librustc_back/target/x86_64_unknown_linux_gnux32.rs
@@ -0,0 +1,35 @@
+// Copyright 2017 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.cpu = "x86-64".to_string();
+    base.max_atomic_width = Some(64);
+    base.pre_link_args.get_mut(&LinkerFlavor::Gcc).unwrap().push("-mx32".to_string());
+    base.stack_probes = true;
+    base.has_elf_tls = false;
+
+    Ok(Target {
+        llvm_target: "x86_64-unknown-linux-gnux32".to_string(),
+        target_endian: "little".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-f80:128-n8:16:32:64-S128".to_string(),
+        arch: "x86_64".to_string(),
+        target_os: "linux".to_string(),
+        target_env: "gnu".to_string(),
+        target_vendor: "unknown".to_string(),
+        linker_flavor: LinkerFlavor::Gcc,
+        options: base,
+    })
+}
diff --git a/src/librustc_llvm/Cargo.toml b/src/librustc_llvm/Cargo.toml
index de5add56b76..a9566c4bcac 100644
--- a/src/librustc_llvm/Cargo.toml
+++ b/src/librustc_llvm/Cargo.toml
@@ -18,4 +18,4 @@ rustc_cratesio_shim = { path = "../librustc_cratesio_shim" }
 
 [build-dependencies]
 build_helper = { path = "../build_helper" }
-cc = "1.0"
+cc = "1.0.1"
diff --git a/src/librustc_trans/Cargo.toml b/src/librustc_trans/Cargo.toml
index 482350d04b5..5b7879ea58e 100644
--- a/src/librustc_trans/Cargo.toml
+++ b/src/librustc_trans/Cargo.toml
@@ -32,4 +32,4 @@ syntax = { path = "../libsyntax" }
 syntax_pos = { path = "../libsyntax_pos" }
 
 [target."cfg(windows)".dependencies]
-cc = "1.0"
+cc = "1.0.1"
diff --git a/src/librustdoc/Cargo.toml b/src/librustdoc/Cargo.toml
index b295b414a03..e168222058f 100644
--- a/src/librustdoc/Cargo.toml
+++ b/src/librustdoc/Cargo.toml
@@ -18,4 +18,4 @@ html-diff = "0.0.4"
 
 [build-dependencies]
 build_helper = { path = "../build_helper" }
-cc = "1.0"
+cc = "1.0.1"
diff --git a/src/libstd/Cargo.toml b/src/libstd/Cargo.toml
index fb276448ffa..c95287390b4 100644
--- a/src/libstd/Cargo.toml
+++ b/src/libstd/Cargo.toml
@@ -36,7 +36,7 @@ rustc_tsan = { path = "../librustc_tsan" }
 
 [build-dependencies]
 build_helper = { path = "../build_helper" }
-cc = "1.0"
+cc = "1.0.1"
 
 [features]
 backtrace = []
diff --git a/src/rustc/compiler_builtins_shim/Cargo.toml b/src/rustc/compiler_builtins_shim/Cargo.toml
index 886e239246d..608e5f5f36d 100644
--- a/src/rustc/compiler_builtins_shim/Cargo.toml
+++ b/src/rustc/compiler_builtins_shim/Cargo.toml
@@ -30,7 +30,7 @@ doctest = false
 core = { path = "../../libcore" }
 
 [build-dependencies]
-cc = "1.0"
+cc = "1.0.1"
 
 [features]
 c = []
diff --git a/src/tools/build-manifest/src/main.rs b/src/tools/build-manifest/src/main.rs
index daeac35a017..8c1b130b116 100644
--- a/src/tools/build-manifest/src/main.rs
+++ b/src/tools/build-manifest/src/main.rs
@@ -95,6 +95,7 @@ static TARGETS: &'static [&'static str] = &[
     "x86_64-unknown-freebsd",
     "x86_64-unknown-fuchsia",
     "x86_64-unknown-linux-gnu",
+    "x86_64-unknown-linux-gnux32",
     "x86_64-unknown-linux-musl",
     "x86_64-unknown-netbsd",
     "x86_64-unknown-redox",