1 files changed, 21 insertions, 0 deletions
diff --git a/clang/lib/Driver/ToolChains/Darwin.cpp b/clang/lib/Driver/ToolChains/Darwin.cpp
index e41b50c40b2..bfe685e70df 100644
--- a/clang/lib/Driver/ToolChains/Darwin.cpp
+++ b/clang/lib/Driver/ToolChains/Darwin.cpp
@@ -1667,6 +1667,27 @@ void MachO::AddLinkRuntimeLibArgs(const ArgList &Args,
   AddLinkRuntimeLib(Args, CmdArgs, CompilerRT, false, true);
 }
 
+bool Darwin::isAlignedAllocationUnavailable() const {
+  switch (TargetPlatform) {
+  case MacOS: // Earlier than 10.13.
+    return TargetVersion < VersionTuple(10U, 13U, 0U);
+  case IPhoneOS:
+  case IPhoneOSSimulator:
+  case TvOS:
+  case TvOSSimulator: // Earlier than 11.0.
+    return TargetVersion < VersionTuple(11U, 0U, 0U);
+  case WatchOS:
+  case WatchOSSimulator: // Earlier than 4.0.
+    return TargetVersion < VersionTuple(4U, 0U, 0U);
+  }
+}
+
+void Darwin::addClangTargetOptions(const llvm::opt::ArgList &DriverArgs,
+                                   llvm::opt::ArgStringList &CC1Args) const {
+  if (isAlignedAllocationUnavailable())
+    CC1Args.push_back("-faligned-alloc-unavailable");
+}
+
 DerivedArgList *
 Darwin::TranslateArgs(const DerivedArgList &Args, StringRef BoundArch,
                       Action::OffloadKind DeviceOffloadKind) const {