From bbe04f213da2a9ec4bbbaa4b50bed4c8b53a3e98 Mon Sep 17 00:00:00 2001
From: Jason Merrill <jason@redhat.com>
Date: Sun, 22 Jan 2012 15:56:34 -0500
Subject: [PATCH] re PR c++/51832 (Rev.182970 causes LTO link errors (multiple
 definitions of allocator_traits))

	PR c++/51832
	* varpool.c (varpool_analyze_pending_decls): Copy DECL_EXTERNAL
	for extra name aliases.

From-SVN: r183396
---
 gcc/ChangeLog                        | 6 ++++++
 gcc/testsuite/ChangeLog              | 7 +++++++
 gcc/testsuite/g++.dg/lto/pr51832.h   | 6 ++++++
 gcc/testsuite/g++.dg/lto/pr51832_0.C | 7 +++++++
 gcc/testsuite/g++.dg/lto/pr51832_1.C | 1 +
 gcc/varpool.c                        | 1 +
 6 files changed, 28 insertions(+)
 create mode 100644 gcc/testsuite/g++.dg/lto/pr51832.h
 create mode 100644 gcc/testsuite/g++.dg/lto/pr51832_0.C
 create mode 100644 gcc/testsuite/g++.dg/lto/pr51832_1.C

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 71df98e6699..be828596d28 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2012-01-22  Jason Merrill  <jason@redhat.com>
+
+	PR c++/51832
+	* varpool.c (varpool_analyze_pending_decls): Copy DECL_EXTERNAL
+	for extra name aliases.
+
 2012-01-22  Eric Botcazou  <ebotcazou@adacore.com>
 
 	PR rtl-optimization/51924
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 07b1fef7697..248578f4b17 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,10 @@
+2012-01-22  Jason Merrill  <jason@redhat.com>
+
+	PR c++/51832
+	* g++.dg/lto/pr51832.h: New.
+	* g++.dg/lto/pr51832_0.C: New.
+	* g++.dg/lto/pr51832_1.C: New.
+
 2012-01-22  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* gcc.dg/ext-elim-1.c: New test.
diff --git a/gcc/testsuite/g++.dg/lto/pr51832.h b/gcc/testsuite/g++.dg/lto/pr51832.h
new file mode 100644
index 00000000000..fee369335ed
--- /dev/null
+++ b/gcc/testsuite/g++.dg/lto/pr51832.h
@@ -0,0 +1,6 @@
+template<class...T> struct A
+{
+  static int i;
+};
+
+inline void f() { A<int>::i = 0; }
diff --git a/gcc/testsuite/g++.dg/lto/pr51832_0.C b/gcc/testsuite/g++.dg/lto/pr51832_0.C
new file mode 100644
index 00000000000..f8fd7ab9019
--- /dev/null
+++ b/gcc/testsuite/g++.dg/lto/pr51832_0.C
@@ -0,0 +1,7 @@
+// PR c++/51832
+// { dg-lto-do link }
+// { dg-lto-options { "-std=c++11 -flto -fabi-version=2" } }
+
+#include "pr51832.h"
+
+int main() { }
diff --git a/gcc/testsuite/g++.dg/lto/pr51832_1.C b/gcc/testsuite/g++.dg/lto/pr51832_1.C
new file mode 100644
index 00000000000..6f0137b5812
--- /dev/null
+++ b/gcc/testsuite/g++.dg/lto/pr51832_1.C
@@ -0,0 +1 @@
+#include "pr51832.h"
diff --git a/gcc/varpool.c b/gcc/varpool.c
index 74fc1ba712b..e01accb21dc 100644
--- a/gcc/varpool.c
+++ b/gcc/varpool.c
@@ -484,6 +484,7 @@ varpool_analyze_pending_decls (void)
 	    {
 	      DECL_WEAK (node->decl) = DECL_WEAK (node->alias_of);
 	      TREE_PUBLIC (node->decl) = TREE_PUBLIC (node->alias_of);
+	      DECL_EXTERNAL (node->decl) = DECL_EXTERNAL (node->alias_of);
 	      DECL_VISIBILITY (node->decl) = DECL_VISIBILITY (node->alias_of);
 	      if (TREE_PUBLIC (node->decl))
 		{