Switch to rust-lang-nursery/compiler-builtins

This commit migrates the in-tree `libcompiler_builtins` to the upstream version
at https://github.com/rust-lang-nursery/compiler-builtins. The upstream version
has a number of intrinsics written in Rust and serves as an in-progress rewrite
of compiler-rt into Rust. Additionally it also contains all the existing
intrinsics defined in `libcompiler_builtins` for 128-bit integers.

It's been the intention since the beginning to make this transition but
previously it just lacked the manpower to get done. As this PR likely shows it
wasn't a trivial integration! Some highlight changes are:

* The PR rust-lang/compiler-builtins#166 contains a number of fixes
  across platforms and also some refactorings to make the intrinsics easier to
  read. The additional testing added there also fixed a number of integration
  issues when pulling the repository into this tree.

* LTO with the compiler-builtins crate was fixed to link in the entire crate
  after the LTO process as these intrinsics are excluded from LTO.

* Treatment of hidden symbols was updated as previously the
  `#![compiler_builtins]` crate would mark all symbol *imports* as hidden
  whereas it was only intended to mark *exports* as hidden.

Author: alexcrichton

.gitmodules

@@ -2,9 +2,6 @@
 	path = src/llvm
 	url = https://github.com/rust-lang/llvm.git
 	branch = master
-[submodule "src/compiler-rt"]
-	path = src/compiler-rt
-	url = https://github.com/rust-lang/compiler-rt.git
 [submodule "src/rt/hoedown"]
 	path = src/rt/hoedown
 	url = https://github.com/rust-lang/hoedown.git
@@ -33,3 +30,6 @@
 [submodule "src/tools/rls"]
 	path = src/tools/rls
 	url = https://github.com/rust-lang-nursery/rls.git
+[submodule "src/libcompiler_builtins"]
+	path = src/libcompiler_builtins
+	url = https://github.com/rust-lang-nursery/compiler-builtins

src/Cargo.lock

@@ -142,6 +142,11 @@ fn main() {
             }
         }
 
+        let crate_name = args.windows(2)
+            .find(|a| &*a[0] == "--crate-name")
+            .unwrap();
+        let crate_name = &*crate_name[1];
+
         // If we're compiling specifically the `panic_abort` crate then we pass
         // the `-C panic=abort` option. Note that we do not do this for any
         // other crate intentionally as this is the only crate for now that we
@@ -150,9 +155,7 @@ fn main() {
         // This... is a bit of a hack how we detect this. Ideally this
         // information should be encoded in the crate I guess? Would likely
         // require an RFC amendment to RFC 1513, however.
-        let is_panic_abort = args.windows(2)
-            .any(|a| &*a[0] == "--crate-name" && &*a[1] == "panic_abort");
-        if is_panic_abort {
+        if crate_name == "panic_abort" {
             cmd.arg("-C").arg("panic=abort");
         }
 
@@ -167,7 +170,15 @@ fn main() {
             Ok(s) => if s == "true" { "y" } else { "n" },
             Err(..) => "n",
         };
-        cmd.arg("-C").arg(format!("debug-assertions={}", debug_assertions));
+
+        // The compiler builtins are pretty sensitive to symbols referenced in
+        // libcore and such, so we never compile them with debug assertions.
+        if crate_name == "compiler_builtins" {
+            cmd.arg("-C").arg("debug-assertions=no");
+        } else {
+            cmd.arg("-C").arg(format!("debug-assertions={}", debug_assertions));
+        }
+
         if let Ok(s) = env::var("RUSTC_CODEGEN_UNITS") {
             cmd.arg("-C").arg(format!("codegen-units={}", s));
         }

src/bootstrap/bin/rustc.rs

@@ -583,7 +583,7 @@ def update_submodules(self):
                                (self.get_toml('jemalloc') or
                                 self.get_mk('CFG_JEMALLOC_ROOT'))))]
         run(["git", "submodule", "update",
-             "--init"] + submodules,
+             "--init", "--recursive"] + submodules,
             cwd=self.rust_root, verbose=self.verbose)
         run(["git", "submodule", "-q", "foreach", "git",
              "reset", "-q", "--hard"],

src/bootstrap/bootstrap.py

@@ -564,10 +564,10 @@ pub fn rust_src(build: &Build) {
         "src/libstd",
         "src/libstd_unicode",
         "src/libunwind",
+        "src/rustc/compiler_builtins_shim",
         "src/rustc/libc_shim",
         "src/libtest",
         "src/libterm",
-        "src/compiler-rt",
         "src/jemalloc",
         "src/libprofiler_builtins",
     ];

src/bootstrap/dist.rs

@@ -239,7 +239,10 @@ pub fn sanitizer_lib_boilerplate(sanitizer_name: &str) -> Result<NativeLibBoiler
         ),
         _ => return Err(()),
     };
-    native_lib_boilerplate("compiler-rt", sanitizer_name, &link_name, search_path)
+    native_lib_boilerplate("libcompiler_builtins/compiler-rt",
+                           sanitizer_name,
+                           &link_name,
+                           search_path)
 }
 
 fn dir_up_to_date(src: &Path, threshold: &FileTime) -> bool {

src/build_helper/lib.rs

@@ -67,13 +67,14 @@ for module in $modules; do
         mv "src/llvm-$commit" src/llvm
         continue
     fi
-    if [ ! -d "$cache_src_dir/$module" ]; then
+    if [ ! -e "$cache_src_dir/$module/.git" ]; then
         echo "WARNING: $module not found in pristine repo"
-        retry sh -c "git submodule deinit -f $module && git submodule update --init $module"
+        retry sh -c "git submodule deinit -f $module && \
+            git submodule update --init --recursive $module"
         continue
     fi
     retry sh -c "git submodule deinit -f $module && \
-        git submodule update --init --reference $cache_src_dir/$module $module"
+        git submodule update --init --recursive --reference $cache_src_dir/$module $module"
 done
 
 travis_fold end update_submodules