Auto merge of #27076 - alexcrichton:update-llvm, r=brson

LLVM has recently created their 3.7 release branch, and this PR updates us to that point. This should hopefully mean that we're basically compatible with the upcoming 3.7 release. Additionally, there are a number of goodies on this branch.

* This contains a fix for https://llvm.org/bugs/show_bug.cgi?id=23957
  which should help us bootstrap farther on 32-bit MSVC targets.
* There is better support for writing multiple flavors of archives, allowing us
  to use the built-in LLVM support instead of the system `ar` on all current
  platforms of the compiler.
* This LLVM has SafeStack support
* An [optimization patch](https://github.com/rust-lang/llvm/commit/7cf5e26e18f7d2d8db09c83c76dd727535f281ab) by @pcwalton is included.
* A number of other minor test fixes here and there.

Due to problems dealing with the data layout we pass to LLVM, this PR also takes the time to clean up how we specific this. We no longer specify a data layout to LLVM by default and instead take the default for the target from LLVM to pass to the module that we're building. This should be more robust going into the future, and I'm also not sure we know what any of these arcane strings are any more...

1 files changed, 92 insertions, 0 deletions

diff --git a/src/test/debuginfo/generic-enum-with-different-disr-sizes.rs b/src/test/debuginfo/generic-enum-with-different-disr-sizes.rs
new file mode 100644
index 00000000000..ae290e228cc
--- /dev/null
+++ b/src/test/debuginfo/generic-enum-with-different-disr-sizes.rs
@@ -0,0 +1,92 @@
+// Copyright 2013-2014 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.
+
+// ignore-tidy-linelength
+// ignore-lldb: FIXME(#27089)
+// min-lldb-version: 310
+
+// compile-flags:-g
+
+// === GDB TESTS ===================================================================================
+// gdb-command:run
+
+// gdb-command:print eight_bytes1
+// gdb-check:$1 = {{RUST$ENUM$DISR = Variant1, __0 = 100}, {RUST$ENUM$DISR = Variant1, __0 = 100}}
+// gdb-command:print four_bytes1
+// gdb-check:$2 = {{RUST$ENUM$DISR = Variant1, __0 = 101}, {RUST$ENUM$DISR = Variant1, __0 = 101}}
+// gdb-command:print two_bytes1
+// gdb-check:$3 = {{RUST$ENUM$DISR = Variant1, __0 = 102}, {RUST$ENUM$DISR = Variant1, __0 = 102}}
+// gdb-command:print one_byte1
+// gdb-check:$4 = {{RUST$ENUM$DISR = Variant1, __0 = 65 'A'}, {RUST$ENUM$DISR = Variant1, __0 = 65 'A'}}
+
+// gdb-command:print eight_bytes2
+// gdb-check:$5 = {{RUST$ENUM$DISR = Variant2, __0 = 100}, {RUST$ENUM$DISR = Variant2, __0 = 100}}
+// gdb-command:print four_bytes2
+// gdb-check:$6 = {{RUST$ENUM$DISR = Variant2, __0 = 101}, {RUST$ENUM$DISR = Variant2, __0 = 101}}
+// gdb-command:print two_bytes2
+// gdb-check:$7 = {{RUST$ENUM$DISR = Variant2, __0 = 102}, {RUST$ENUM$DISR = Variant2, __0 = 102}}
+// gdb-command:print one_byte2
+// gdb-check:$8 = {{RUST$ENUM$DISR = Variant2, __0 = 65 'A'}, {RUST$ENUM$DISR = Variant2, __0 = 65 'A'}}
+
+// gdb-command:continue
+
+// === LLDB TESTS ==================================================================================
+// lldb-command:run
+
+// lldb-command:print eight_bytes1
+// lldb-check:[...]$0 = Variant1(100)
+// lldb-command:print four_bytes1
+// lldb-check:[...]$1 = Variant1(101)
+// lldb-command:print two_bytes1
+// lldb-check:[...]$2 = Variant1(102)
+// lldb-command:print one_byte1
+// lldb-check:[...]$3 = Variant1('A')
+
+// lldb-command:print eight_bytes2
+// lldb-check:[...]$4 = Variant2(100)
+// lldb-command:print four_bytes2
+// lldb-check:[...]$5 = Variant2(101)
+// lldb-command:print two_bytes2
+// lldb-check:[...]$6 = Variant2(102)
+// lldb-command:print one_byte2
+// lldb-check:[...]$7 = Variant2('A')
+
+// lldb-command:continue
+
+#![allow(unused_variables)]
+#![allow(dead_code)]
+#![omit_gdb_pretty_printer_section]
+
+// This test case makes sure that we get correct type descriptions for the enum
+// discriminant of different instantiations of the same generic enum type where,
+// dependending on the generic type parameter(s), the discriminant has a
+// different size in memory.
+
+enum Enum<T> {
+    Variant1(T),
+    Variant2(T)
+}
+
+fn main() {
+    // These are ordered for descending size on purpose
+    let eight_bytes1 = Enum::Variant1(100.0f64);
+    let four_bytes1 = Enum::Variant1(101i32);
+    let two_bytes1 = Enum::Variant1(102i16);
+    let one_byte1 = Enum::Variant1(65u8);
+
+    let eight_bytes2 = Enum::Variant2(100.0f64);
+    let four_bytes2 = Enum::Variant2(101i32);
+    let two_bytes2 = Enum::Variant2(102i16);
+    let one_byte2 = Enum::Variant2(65u8);
+
+    zzz(); // #break
+}
+
+fn zzz() { () }