Index: COFF/Chunks.cpp
===================================================================
--- COFF/Chunks.cpp
+++ COFF/Chunks.cpp
@@ -11,6 +11,7 @@
 #include "Error.h"
 #include "InputFiles.h"
 #include "Symbols.h"
+#include "llvm/ADT/Twine.h"
 #include "llvm/Object/COFF.h"
 #include "llvm/Support/COFF.h"
 #include "llvm/Support/Debug.h"
@@ -61,7 +62,7 @@
   case IMAGE_REL_AMD64_SECTION:  add16(Off, Sym->getSectionIndex()); break;
   case IMAGE_REL_AMD64_SECREL:   add32(Off, Sym->getSecrel()); break;
   default:
-    fatal("unsupported relocation type");
+    fatal("unsupported relocation type " + Twine::utohexstr(Type));
   }
 }
 
@@ -76,7 +77,7 @@
   case IMAGE_REL_I386_SECTION:  add16(Off, Sym->getSectionIndex()); break;
   case IMAGE_REL_I386_SECREL:   add32(Off, Sym->getSecrel()); break;
   default:
-    fatal("unsupported relocation type");
+    fatal("unsupported relocation type " + Twine::utohexstr(Type));
   }
 }
 
@@ -136,7 +137,7 @@
   case IMAGE_REL_ARM_BLX23T:    applyBranch24T(Off, S - P - 4); break;
   case IMAGE_REL_ARM_SECREL:    add32(Off, Sym->getSecrel()); break;
   default:
-    fatal("unsupported relocation type");
+    fatal("unsupported relocation type " + Twine::utohexstr(Type));
   }
 }