add solaris sparcv9 support

* Update bootstrap to recognize the cputype 'sparcv9' (used on Solaris)
* Change to never use -fomit-frame-pointer on Solaris or for sparc
* Adds rust target sparcv9-sun-solaris

Fixes #39901

src/bootstrap/bootstrap.py

@@ -416,6 +416,8 @@ def build_triple(self):
             ostype += 'abi64'
         elif cputype in {'powerpc', 'ppc', 'ppc64'}:
             cputype = 'powerpc'
+        elif cputype == 'sparcv9':
+            pass
         elif cputype in {'amd64', 'x86_64', 'x86-64', 'x64'}:
             cputype = 'x86_64'
         else:

src/libcompiler_builtins/build.rs

@@ -92,7 +92,15 @@ fn main() {
         // compiler-rt's build system already
         cfg.flag("-fno-builtin");
         cfg.flag("-fvisibility=hidden");
-        cfg.flag("-fomit-frame-pointer");
+        // Accepted practice on Solaris is to never omit frame pointer so that
+        // system observability tools work as expected.  In addition, at least
+        // on Solaris, -fomit-frame-pointer on sparcv9 appears to generate
+        // references to data outside of the current stack frame.  A search of
+        // the gcc bug database provides a variety of issues surrounding
+        // -fomit-frame-pointer on non-x86 platforms.
+        if !target.contains("solaris") && !target.contains("sparc") {
+            cfg.flag("-fomit-frame-pointer");
+        }
         cfg.flag("-ffreestanding");
         cfg.define("VISIBILITY_HIDDEN", None);
     }

src/librustc_back/target/mod.rs

@@ -200,6 +200,7 @@ supported_targets! {
     ("armv7s-apple-ios", armv7s_apple_ios),
 
     ("x86_64-sun-solaris", x86_64_sun_solaris),
+    ("sparcv9-sun-solaris", sparcv9_sun_solaris),
 
     ("x86_64-pc-windows-gnu", x86_64_pc_windows_gnu),
     ("i686-pc-windows-gnu", i686_pc_windows_gnu),

src/librustc_back/target/sparcv9_sun_solaris.rs

@@ -0,0 +1,35 @@
+// Copyright 2016 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 target::{Target, TargetResult};
+
+pub fn target() -> TargetResult {
+    let mut base = super::solaris_base::opts();
+    base.pre_link_args.push("-m64".to_string());
+    // llvm calls this "v9"
+    base.cpu = "v9".to_string();
+    base.max_atomic_width = Some(64);
+
+    Ok(Target {
+        llvm_target: "sparcv9-sun-solaris".to_string(),
+        target_endian: "big".to_string(),
+        target_pointer_width: "64".to_string(),
+        data_layout: "E-m:e-i64:64-n32:64-S128".to_string(),
+        // Use "sparc64" instead of "sparcv9" here, since the former is already
+        // used widely in the source base.  If we ever needed ABI
+        // differentiation from the sparc64, we could, but that would probably
+        // just be confusing.
+        arch: "sparc64".to_string(),
+        target_os: "solaris".to_string(),
+        target_env: "".to_string(),
+        target_vendor: "sun".to_string(),
+        options: base,
+    })
+}