diff --git a/flang/lib/Optimizer/CodeGen/Target.cpp b/flang/lib/Optimizer/CodeGen/Target.cpp
--- a/flang/lib/Optimizer/CodeGen/Target.cpp
+++ b/flang/lib/Optimizer/CodeGen/Target.cpp
@@ -349,6 +349,10 @@
     case llvm::Triple::OSType::Linux:
     case llvm::Triple::OSType::Darwin:
     case llvm::Triple::OSType::MacOSX:
+    case llvm::Triple::OSType::DragonFly:
+    case llvm::Triple::OSType::FreeBSD:
+    case llvm::Triple::OSType::NetBSD:
+    case llvm::Triple::OSType::OpenBSD:
     case llvm::Triple::OSType::Solaris:
     case llvm::Triple::OSType::Win32:
       return std::make_unique<TargetI386>(ctx, std::move(trp),
@@ -362,6 +366,10 @@
     case llvm::Triple::OSType::Linux:
     case llvm::Triple::OSType::Darwin:
     case llvm::Triple::OSType::MacOSX:
+    case llvm::Triple::OSType::DragonFly:
+    case llvm::Triple::OSType::FreeBSD:
+    case llvm::Triple::OSType::NetBSD:
+    case llvm::Triple::OSType::OpenBSD:
     case llvm::Triple::OSType::Solaris:
     case llvm::Triple::OSType::Win32:
       return std::make_unique<TargetX86_64>(ctx, std::move(trp),
@@ -375,6 +383,9 @@
     case llvm::Triple::OSType::Linux:
     case llvm::Triple::OSType::Darwin:
     case llvm::Triple::OSType::MacOSX:
+    case llvm::Triple::OSType::FreeBSD:
+    case llvm::Triple::OSType::NetBSD:
+    case llvm::Triple::OSType::OpenBSD:
     case llvm::Triple::OSType::Win32:
       return std::make_unique<TargetAArch64>(ctx, std::move(trp),
                                              std::move(kindMap));
@@ -385,6 +396,7 @@
     default:
       break;
     case llvm::Triple::OSType::Linux:
+    case llvm::Triple::OSType::FreeBSD:
       return std::make_unique<TargetPPC64le>(ctx, std::move(trp),
                                              std::move(kindMap));
     }
@@ -394,6 +406,7 @@
     default:
       break;
     case llvm::Triple::OSType::Linux:
+    case llvm::Triple::OSType::NetBSD:
     case llvm::Triple::OSType::Solaris:
       return std::make_unique<TargetSparc>(ctx, std::move(trp),
                                            std::move(kindMap));
@@ -404,6 +417,8 @@
     default:
       break;
     case llvm::Triple::OSType::Linux:
+    case llvm::Triple::OSType::NetBSD:
+    case llvm::Triple::OSType::OpenBSD:
     case llvm::Triple::OSType::Solaris:
       return std::make_unique<TargetSparcV9>(ctx, std::move(trp),
                                              std::move(kindMap));