From 67fcdf7f6579fcc070f019096cedf80d5a834554 Mon Sep 17 00:00:00 2001
From: David Greene <greened@obbligato.org>
Date: Tue, 10 Jul 2007 22:00:30 +0000
Subject: [PATCH] Make this work with GLIBCXX_DEBUG.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@38516 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/BranchFolding.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/lib/CodeGen/BranchFolding.cpp b/lib/CodeGen/BranchFolding.cpp
index d0dcc708d06..431bc4eca35 100644
--- a/lib/CodeGen/BranchFolding.cpp
+++ b/lib/CodeGen/BranchFolding.cpp
@@ -429,8 +429,15 @@ static bool MergeCompare(const std::pair<unsigned,MachineBasicBlock*> &p,
       return true;
     else if (p.second->getNumber() > q.second->getNumber())
       return false;
-    else
+    else {
+      // _GLIBCXX_DEBUG needs to check strict weak ordering and it
+      // does it by doing a compare on the same object.
+#ifdef _GLIBCXX_DEBUG
+      return(false);
+#else
       assert(0 && "Predecessor appears twice");
+#endif
+    }
 }
 
 // See if any of the blocks in MergePotentials (which all have a common single