Index: COFF/LTO.cpp
===================================================================
--- COFF/LTO.cpp
+++ COFF/LTO.cpp
@@ -60,6 +60,28 @@
   C.DisableVerify = true;
   C.DiagHandler = diagnosticHandler;
   C.OptLevel = Config->LTOO;
+
+  // Set CGOptLevel
+  switch (C.OptLevel) {
+    default:
+      break;
+    case 0:
+      C.CGOptLevel = CodeGenOpt::None;
+      break;
+    case 1:
+      C.CGOptLevel = CodeGenOpt::Less;
+      break;
+    case 2:
+      C.CGOptLevel = CodeGenOpt::Default;
+      break;
+    case 3:
+      C.CGOptLevel = CodeGenOpt::Aggressive;
+      break;
+  }
+
+  // Add -mattr options
+  C.MAttrs = GetMAttrs();
+
   if (Config->SaveTemps)
     checkError(C.addSaveTemps(std::string(Config->OutputFile) + ".",
                               /*UseInputModulePath*/ true));
Index: Common/TargetOptionsCommandFlags.cpp
===================================================================
--- Common/TargetOptionsCommandFlags.cpp
+++ Common/TargetOptionsCommandFlags.cpp
@@ -32,3 +32,11 @@
 }
 
 std::string lld::GetCPUStr() { return ::getCPUStr(); }
+
+std::vector<std::string> lld::GetMAttrs(){
+  std::vector<std::string> Attrs;
+  for (std::string &Attr : MAttrs)
+    Attrs.push_back(Attr);
+  return Attrs;
+}
+
Index: ELF/LTO.cpp
===================================================================
--- ELF/LTO.cpp
+++ ELF/LTO.cpp
@@ -89,6 +89,27 @@
   C.OptLevel = Config->LTOO;
   C.CPU = GetCPUStr();
 
+  // Set CGOptLevel
+  switch (C.OptLevel) {
+    default:
+      break;
+    case 0:
+      C.CGOptLevel = CodeGenOpt::None;
+      break;
+    case 1:
+      C.CGOptLevel = CodeGenOpt::Less;
+      break;
+    case 2:
+      C.CGOptLevel = CodeGenOpt::Default;
+      break;
+    case 3:
+      C.CGOptLevel = CodeGenOpt::Aggressive;
+      break;
+  }
+
+  // Add -mattr options
+  C.MAttrs = GetMAttrs();
+
   // Set up a custom pipeline if we've been asked to.
   C.OptPipeline = Config->LTONewPmPasses;
   C.AAPipeline = Config->LTOAAPipeline;
Index: include/lld/Common/TargetOptionsCommandFlags.h
===================================================================
--- include/lld/Common/TargetOptionsCommandFlags.h
+++ include/lld/Common/TargetOptionsCommandFlags.h
@@ -19,4 +19,5 @@
 llvm::TargetOptions InitTargetOptionsFromCodeGenFlags();
 llvm::Optional<llvm::CodeModel::Model> GetCodeModelFromCMModel();
 std::string GetCPUStr();
+std::vector<std::string> GetMAttrs();
 }
Index: wasm/LTO.cpp
===================================================================
--- wasm/LTO.cpp
+++ wasm/LTO.cpp
@@ -56,6 +56,27 @@
   C.DiagHandler = diagnosticHandler;
   C.OptLevel = Config->LTOO;
 
+  // Set CGOptLevel
+  switch (C.OptLevel) {
+    default:
+      break;
+    case 0:
+      C.CGOptLevel = CodeGenOpt::None;
+      break;
+    case 1:
+      C.CGOptLevel = CodeGenOpt::Less;
+      break;
+    case 2:
+      C.CGOptLevel = CodeGenOpt::Default;
+      break;
+    case 3:
+      C.CGOptLevel = CodeGenOpt::Aggressive;
+      break;
+  }
+
+  // Add -mattr options
+  C.MAttrs = GetMAttrs();
+
   if (Config->SaveTemps)
     checkError(C.addSaveTemps(Config->OutputFile.str() + ".",
                               /*UseInputModulePath*/ true));