Index: lld/COFF/PDB.cpp
===================================================================
--- lld/COFF/PDB.cpp
+++ lld/COFF/PDB.cpp
@@ -1088,6 +1088,13 @@
   pdb::DbiStreamBuilder &DbiBuilder = Builder.getDbiBuilder();
   DbiBuilder.setAge(BuildId.PDB70.Age);
   DbiBuilder.setVersionHeader(pdb::PdbDbiV70);
+  DbiBuilder.setMachineType(Config->is64() ? pdb::PDB_Machine::Amd64
+                                           : pdb::PDB_Machine::x86);
+  // Technically we are not link.exe 14.11, but there are known cases where
+  // debugging tools on Windows expect Microsoft-specific version numbers or
+  // they fail to work at all.  Since we know we produce PDBs that are
+  // compatible with LINK 14.11, we set that version number here.
+  DbiBuilder.setBuildNumber(14, 11);
 }
 
 void PDBLinker::addSectionContrib(pdb::DbiModuleDescriptorBuilder &LinkerModule,
Index: llvm/include/llvm/DebugInfo/PDB/Native/DbiStreamBuilder.h
===================================================================
--- llvm/include/llvm/DebugInfo/PDB/Native/DbiStreamBuilder.h
+++ llvm/include/llvm/DebugInfo/PDB/Native/DbiStreamBuilder.h
@@ -46,6 +46,7 @@
   void setVersionHeader(PdbRaw_DbiVer V);
   void setAge(uint32_t A);
   void setBuildNumber(uint16_t B);
+  void setBuildNumber(uint8_t Major, uint8_t Minor);
   void setPdbDllVersion(uint16_t V);
   void setPdbDllRbld(uint16_t R);
   void setFlags(uint16_t F);
Index: llvm/lib/DebugInfo/PDB/Native/DbiStreamBuilder.cpp
===================================================================
--- llvm/lib/DebugInfo/PDB/Native/DbiStreamBuilder.cpp
+++ llvm/lib/DebugInfo/PDB/Native/DbiStreamBuilder.cpp
@@ -37,6 +37,14 @@
 
 void DbiStreamBuilder::setBuildNumber(uint16_t B) { BuildNumber = B; }
 
+void DbiStreamBuilder::setBuildNumber(uint8_t Major, uint8_t Minor) {
+  BuildNumber = (uint16_t(Major) << DbiBuildNo::BuildMajorShift) &
+                DbiBuildNo::BuildMajorMask;
+  BuildNumber |= (uint16_t(Minor) << DbiBuildNo::BuildMinorShift) &
+                 DbiBuildNo::BuildMinorMask;
+  BuildNumber |= DbiBuildNo::NewVersionFormatMask;
+}
+
 void DbiStreamBuilder::setPdbDllVersion(uint16_t V) { PdbDllVersion = V; }
 
 void DbiStreamBuilder::setPdbDllRbld(uint16_t R) { PdbDllRbld = R; }
@@ -251,7 +259,7 @@
   H->TypeServerSize = 0;
   H->SymRecordStreamIndex = SymRecordStreamIndex;
   H->PublicSymbolStreamIndex = PublicsStreamIndex;
-  H->MFCTypeServerIndex = kInvalidStreamIndex;
+  H->MFCTypeServerIndex = 0; // Not sure what this is, but link.exe writes 0.
   H->GlobalSymbolStreamIndex = GlobalsStreamIndex;
 
   Header = H;