Index: llvm/utils/gn/secondary/BUILD.gn
===================================================================
--- llvm/utils/gn/secondary/BUILD.gn
+++ llvm/utils/gn/secondary/BUILD.gn
@@ -1,6 +1,8 @@
 group("default") {
   deps = [
+    "//llvm/lib/Bitcode/Reader",
     "//llvm/lib/IR",
+    "//llvm/lib/MC/MCParser",
     "//llvm/tools/llvm-undname",
     "//llvm/utils/TableGen:llvm-tblgen",
   ]
Index: llvm/utils/gn/secondary/llvm/lib/Bitcode/Reader/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/llvm/lib/Bitcode/Reader/BUILD.gn
@@ -0,0 +1,16 @@
+static_library("Reader") {
+  output_name = "LLVMBitReader"
+  deps = [
+    "//llvm/include/llvm/Config:llvm-config",
+    "//llvm/lib/IR",
+    "//llvm/lib/Support",
+  ]
+
+  sources = [
+    "BitReader.cpp",
+    "BitcodeReader.cpp",
+    "BitstreamReader.cpp",
+    "MetadataLoader.cpp",
+    "ValueList.cpp",
+  ]
+}
Index: llvm/utils/gn/secondary/llvm/lib/MC/MCParser/BUILD.gn
===================================================================
--- /dev/null
+++ llvm/utils/gn/secondary/llvm/lib/MC/MCParser/BUILD.gn
@@ -0,0 +1,20 @@
+static_library("MCParser") {
+  output_name = "LLVMMCParser"
+  deps = [
+    "//llvm/lib/MC",
+    "//llvm/lib/Support",
+  ]
+
+  sources = [
+    "AsmLexer.cpp",
+    "AsmParser.cpp",
+    "COFFAsmParser.cpp",
+    "DarwinAsmParser.cpp",
+    "ELFAsmParser.cpp",
+    "MCAsmLexer.cpp",
+    "MCAsmParser.cpp",
+    "MCAsmParserExtension.cpp",
+    "MCTargetAsmParser.cpp",
+    "WasmAsmParser.cpp",
+  ]
+}