diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index eecdd1a1941..41fb7923a7e 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,10 @@
+2010-03-20  Dodji Seketeli  <dodji@redhat.com>
+
+	PR c++/43375
+	* method.c (make_alias_for): Avoid crashing when DECL_LANG_SPECIFIC
+	is NULL.
+	* decl2.c (vague_linkage_p): Likewise.
+
 2010-03-18  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/43418
diff --git a/gcc/cp/decl2.c b/gcc/cp/decl2.c
index 81d7ee3212f..4e4930af563 100644
--- a/gcc/cp/decl2.c
+++ b/gcc/cp/decl2.c
@@ -1655,7 +1655,8 @@ vague_linkage_p (tree decl)
   return (DECL_COMDAT (decl)
 	  || (((TREE_CODE (decl) == FUNCTION_DECL
 		&& DECL_DECLARED_INLINE_P (decl))
-	       || DECL_TEMPLATE_INSTANTIATION (decl))
+	       || (DECL_LANG_SPECIFIC (decl)
+		   && DECL_TEMPLATE_INSTANTIATION (decl)))
 	      && TREE_PUBLIC (decl)));
 }
 
diff --git a/gcc/cp/method.c b/gcc/cp/method.c
index a93ad068e52..5ed98bc93bd 100644
--- a/gcc/cp/method.c
+++ b/gcc/cp/method.c
@@ -221,12 +221,15 @@ make_alias_for (tree target, tree newid)
   TREE_THIS_VOLATILE (alias) = TREE_THIS_VOLATILE (target);
   TREE_PUBLIC (alias) = 0;
   DECL_INTERFACE_KNOWN (alias) = 1;
-  DECL_NOT_REALLY_EXTERN (alias) = 1;
+  if (DECL_LANG_SPECIFIC (alias))
+    {
+      DECL_NOT_REALLY_EXTERN (alias) = 1;
+      DECL_USE_TEMPLATE (alias) = 0;
+      DECL_TEMPLATE_INFO (alias) = NULL;
+    }
   DECL_EXTERNAL (alias) = 0;
   DECL_ARTIFICIAL (alias) = 1;
-  DECL_USE_TEMPLATE (alias) = 0;
   DECL_TEMPLATE_INSTANTIATED (alias) = 0;
-  DECL_TEMPLATE_INFO (alias) = NULL;
   if (TREE_CODE (alias) == FUNCTION_DECL)
     {
       DECL_SAVED_FUNCTION_DATA (alias) = NULL;
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 8e5ca1fe14e..f0d88f0ed71 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2010-03-20  Dodji Seketeli  <dodji@redhat.com>
+
+	PR c++/43375
+	* g++.dg/abi/mangle42.C: New test.
+
 2010-03-19  Andrew Pinski  <andrew_pinski@caviumnetworks.com>
 
 	PR C/43211
diff --git a/gcc/testsuite/g++.dg/abi/mangle42.C b/gcc/testsuite/g++.dg/abi/mangle42.C
new file mode 100644
index 00000000000..730781b300b
--- /dev/null
+++ b/gcc/testsuite/g++.dg/abi/mangle42.C
@@ -0,0 +1,14 @@
+// Origin: PR c++/43375
+// { dg-do compile { target i?86-*-* x86_64-*-* } }
+// { dg-options "-msse2 -std=gnu++0x" }
+
+typedef float __v4sf __attribute__ ((__vector_size__ (16)));
+typedef int __v4si __attribute__ ((__vector_size__ (16)));
+__v4sf my_asin(__v4sf x)
+{
+  static const __v4si g_Mask{0x7fffffff,
+			     0x00000000,
+			     0x7fffffff,
+			     0x7fffffff };
+  return __builtin_ia32_andnps ((__v4sf) g_Mask, x);
+}