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Ensure main() always has external linkage #48541

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Feb 28, 2018
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5 changes: 4 additions & 1 deletion src/librustc_mir/monomorphize/item.rs
Original file line number Diff line number Diff line change
Expand Up @@ -118,10 +118,13 @@ pub trait MonoItemExt<'a, 'tcx>: fmt::Debug {

match *self.as_mono_item() {
MonoItem::Fn(ref instance) => {
let entry_def_id =
tcx.sess.entry_fn.borrow().map(|(id, _)| tcx.hir.local_def_id(id));
// If this function isn't inlined or otherwise has explicit
// linkage, then we'll be creating a globally shared version.
if self.explicit_linkage(tcx).is_some() ||
!instance.def.requires_local(tcx)
!instance.def.requires_local(tcx) ||
Some(instance.def_id()) == entry_def_id
{
return InstantiationMode::GloballyShared { may_conflict: false }
}
Expand Down
12 changes: 12 additions & 0 deletions src/test/run-pass/inlined-main.rs
Original file line number Diff line number Diff line change
@@ -0,0 +1,12 @@
// 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.

#[inline(always)]
fn main() {}