[binutils-gdb] Fix gdb.rust/simple.rs for more recent compilers

[Tom Tromey <tromey at sourceware dot org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=994b876a510ad2ed7e0d34a4c7d08f8039cef6ef

commit 994b876a510ad2ed7e0d34a4c7d08f8039cef6ef
Author: Tom Tromey <tom@tromey.com>
Date:   Mon Nov 19 10:52:32 2018 -0700

    Fix gdb.rust/simple.rs for more recent compilers
    
    gdb.rust/simple.exp will fail when run with a recent version of rustc.
    This patch fixes the test case so that it will continue to run.
    
    Tested on x86-64 Fedora 28.
    
    I also temporarily backed out the rust-lang.c from
    commit 098b2108a2b61531c0bc8ea16854f773083a95d7, and verified that
    this updated test still would have provoked the original bug.
    
    gdb/testsuite/ChangeLog
    2018-11-19  Tom Tromey  <tom@tromey.com>
    
    	* gdb.rust/simple.rs: Don't initialize empty_enum_value.

Diff:
---
 gdb/testsuite/ChangeLog          | 4 ++++
 gdb/testsuite/gdb.rust/simple.rs | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 9acaa79..e7693a0 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2018-11-19  Tom Tromey  <tom@tromey.com>
+
+	* gdb.rust/simple.rs: Don't initialize empty_enum_value.
+
 2018-11-19  Pedro Alves  <palves@redhat.com>
 
 	* gdb.base/warning.exp: Don't override INTERNAL_FLAGS.  Use
diff --git a/gdb/testsuite/gdb.rust/simple.rs b/gdb/testsuite/gdb.rust/simple.rs
index 00a25e0..79d463c 100644
--- a/gdb/testsuite/gdb.rust/simple.rs
+++ b/gdb/testsuite/gdb.rust/simple.rs
@@ -170,7 +170,7 @@ fn main () {
     let u = Union { f2: 255 };
     let simplelayout = SimpleLayout { f1: 8, f2: 9 };
 
-    let empty_enum_value: EmptyEnum = unsafe { ::std::mem::zeroed() };
+    let empty_enum_value: EmptyEnum;
 
     println!("{}, {}", x.0, x.1);        // set breakpoint here
     println!("{}", diff2(92, 45));