From c7ddc5f43821039f4c005271912da30ba0f213db Mon Sep 17 00:00:00 2001
From: Bill Hoffman <bill.hoffman@kitware.com>
Date: Thu, 19 Nov 2015 17:21:03 -0500
Subject: [PATCH] Fix auto export symbols for Dlls containing /bigobj for 64bit
 builds.

This fixes a bug where 64 bit builds with /bigobj incorrectly determined
that the object files were not 64 bit. This manifested itself with
printf type functions showing up as undefined because the leading
underscore was being removed and should not be removed.
---
 Source/bindexplib.cxx                    | 2 +-
 Tests/RunCMake/AutoExportDll/sub/sub.cxx | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/Source/bindexplib.cxx b/Source/bindexplib.cxx
index dc4db6358..b2508422f 100644
--- a/Source/bindexplib.cxx
+++ b/Source/bindexplib.cxx
@@ -425,7 +425,7 @@ DumpFile(const char* filename, FILE *fout)
       if(h->Sig1 == 0x0 && h->Sig2 == 0xffff) {
          DumpSymbols<cmANON_OBJECT_HEADER_BIGOBJ, cmIMAGE_SYMBOL_EX>
            symbolDumper((cmANON_OBJECT_HEADER_BIGOBJ*) lpFileBase, fout,
-                        (dosHeader->e_magic == IMAGE_FILE_MACHINE_AMD64));
+                        (h->Machine == IMAGE_FILE_MACHINE_AMD64));
          symbolDumper.DumpObjFile();
       } else {
          printf("unrecognized file format in '%s'\n", filename);
diff --git a/Tests/RunCMake/AutoExportDll/sub/sub.cxx b/Tests/RunCMake/AutoExportDll/sub/sub.cxx
index 9766b41ec..9a3145ec4 100644
--- a/Tests/RunCMake/AutoExportDll/sub/sub.cxx
+++ b/Tests/RunCMake/AutoExportDll/sub/sub.cxx
@@ -1,4 +1,6 @@
+#include <stdio.h>
 int sub()
 {
+  printf("");
   return 10;
 }