[PATCH] Recognize 0x0000 as a COFF file magic.

[Rui Ueyama]

Hi Bigcheese,

Some machine-type-neutral object files containing only undefined symbols
actually do exist in the Windows standard library. Need to recognize them
as COFF files.

http://llvm-reviews.chandlerc.com/D2164

Files:
  lib/Support/Path.cpp

Index: lib/Support/Path.cpp
===================================================================
--- lib/Support/Path.cpp
+++ lib/Support/Path.cpp
@@ -853,6 +853,9 @@
       if (Magic.size() >= sizeof(Expected) &&
           memcmp(Magic.data(), Expected, sizeof(Expected)) == 0)
         return file_magic::windows_resource;
+      // 0x0000 = COFF unknown machine type
+      if (Magic[1] == 0)
+        return file_magic::coff_object;
       break;
     }
     case 0xDE:  // 0x0B17C0DE = BC wraper
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