rustc: Add LLVM nounwind with -C panic=abort

src/librustc_trans/callee.rs

@@ -24,6 +24,7 @@ use rustc::hir::def_id::DefId;
 use rustc::ty::{self, TypeFoldable};
 use rustc::traits;
 use rustc::ty::subst::Substs;
+use rustc_back::PanicStrategy;
 use type_of;
 
 /// Translates a reference to a fn/method item, monomorphizing and
@@ -105,8 +106,10 @@ pub fn get_fn<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>,
         // *in Rust code* may unwind. Foreign items like `extern "C" {
         // fn foo(); }` are assumed not to unwind **unless** they have
         // a `#[unwind]` attribute.
-        if !tcx.is_foreign_item(instance_def_id) {
-            attributes::unwind(llfn, true);
+        if tcx.sess.panic_strategy() == PanicStrategy::Unwind {
+            if !tcx.is_foreign_item(instance_def_id) {
+                attributes::unwind(llfn, true);
+            }
         }
 
         // Apply an appropriate linkage/visibility value to our item that we

src/librustc_trans/declare.rs

@@ -24,6 +24,7 @@ use llvm::{self, ValueRef};
 use llvm::AttributePlace::Function;
 use rustc::ty::Ty;
 use rustc::session::config::Sanitizer;
+use rustc_back::PanicStrategy;
 use abi::{Abi, FnType};
 use attributes;
 use context::CrateContext;
@@ -98,6 +99,10 @@ fn declare_raw_fn(ccx: &CrateContext, name: &str, callconv: llvm::CallConv, ty:
         _ => {},
     }
 
+    if ccx.tcx().sess.panic_strategy() != PanicStrategy::Unwind {
+        attributes::unwind(llfn, false);
+    }
+
     llfn
 }
 

src/test/codegen/auxiliary/nounwind.rs

@@ -0,0 +1,13 @@
+// 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.
+
+#[no_mangle]
+pub fn bar() {
+}

src/test/codegen/nounwind.rs

@@ -0,0 +1,26 @@
+// 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.
+
+// aux-build:nounwind.rs
+// compile-flags: -C no-prepopulate-passes -C panic=abort -C metadata=a
+// ignore-windows
+
+#![crate_type = "lib"]
+
+extern crate nounwind;
+
+#[no_mangle]
+pub fn foo() {
+    nounwind::bar();
+// CHECK: @foo() unnamed_addr #0
+// CHECK: @bar() unnamed_addr #0
+// CHECK: attributes #0 = { {{.*}}nounwind{{.*}} }
+}
+

src/test/codegen/panic-abort-windows.rs

@@ -28,7 +28,7 @@
 
 #![crate_type = "lib"]
 
-// CHECK: Function Attrs: uwtable
+// CHECK: Function Attrs: nounwind uwtable
 // CHECK-NEXT: define void @normal_uwtable()
 #[no_mangle]
 pub fn normal_uwtable() {