--- a/third_party/swiftshader/third_party/llvm-10.0/BUILD.gn
+++ b/third_party/swiftshader/third_party/llvm-10.0/BUILD.gn
@@ -574,6 +574,7 @@ swiftshader_llvm_source_set("swiftshader
     "llvm/lib/MC/MCAsmInfoCOFF.cpp",
     "llvm/lib/MC/MCAsmInfoDarwin.cpp",
     "llvm/lib/MC/MCAsmInfoELF.cpp",
+    "llvm/lib/MC/MCAsmInfoXCOFF.cpp",
     "llvm/lib/MC/MCAsmMacro.cpp",
     "llvm/lib/MC/MCAsmStreamer.cpp",
     "llvm/lib/MC/MCAssembler.cpp",
@@ -629,6 +630,7 @@ swiftshader_llvm_source_set("swiftshader
     "llvm/lib/MC/MCWinCOFFStreamer.cpp",
     "llvm/lib/MC/MCWinEH.cpp",
     "llvm/lib/MC/MCXCOFFStreamer.cpp",
+    "llvm/lib/MC/MCXCOFFObjectTargetWriter.cpp",
     "llvm/lib/MC/MachObjectWriter.cpp",
     "llvm/lib/MC/StringTableBuilder.cpp",
     "llvm/lib/MC/SubtargetFeature.cpp",