Fix the msvs 2010 build.

The Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 16.00.30319.01
implements parts of C++0x based on the draft standard. An old version of
the draft had a bug that makes std::pair<T1*, T2*>(something, 0) fail to
compile. This is because the template<class U, class V> pair(U&& x, V&& y)
constructor is selected, even though it later fails to implicitly convert
U and V to frist_type and second_type.

This has been fixed in n3090, but it seems that Microsoft is not going to
update msvc.

llvm-svn: 112257

1 files changed, 8 insertions, 2 deletions

diff --git a/llvm/tools/llvm-diff/DifferenceEngine.h b/llvm/tools/llvm-diff/DifferenceEngine.h
index bc331317344..1609bd5c108 100644
--- a/llvm/tools/llvm-diff/DifferenceEngine.h
+++ b/llvm/tools/llvm-diff/DifferenceEngine.h
@@ -79,8 +79,14 @@ namespace llvm {
       void addMatch(Instruction *L, Instruction *R) {
         Diff.push_back(DiffRecord(L, R));
       }
-      void addLeft(Instruction *L) { Diff.push_back(DiffRecord(L, 0)); }
-      void addRight(Instruction *R) { Diff.push_back(DiffRecord(0, R)); }
+      void addLeft(Instruction *L) {
+        // HACK: VS 2010 has a bug in the stdlib that requires this.
+        Diff.push_back(DiffRecord(L, DiffRecord::second_type(0)));
+      }
+      void addRight(Instruction *R) {
+        // HACK: VS 2010 has a bug in the stdlib that requires this.
+        Diff.push_back(DiffRecord(DiffRecord::first_type(0), R));
+      }
 
       unsigned getNumLines() const { return Diff.size(); }
       DiffChange getLineKind(unsigned I) const {