From da1929b38bcb8654b6bf2d2e87eed53be4509b3a Mon Sep 17 00:00:00 2001
From: Chinmay Garde <chinmaygarde@google.com>
Date: Mon, 31 Jan 2022 14:57:21 -0800
Subject: [PATCH] Gate the minimum iOS deployment versions in the generated
 shaders.

---
 engine/src/flutter/impeller/renderer/allocator.cc        | 2 +-
 engine/src/flutter/impeller/renderer/platform.h          | 2 +-
 engine/src/flutter/impeller/tools/build_metal_library.py | 1 +
 3 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/engine/src/flutter/impeller/renderer/allocator.cc b/engine/src/flutter/impeller/renderer/allocator.cc
index fa4147141cf..5969d220c21 100644
--- a/engine/src/flutter/impeller/renderer/allocator.cc
+++ b/engine/src/flutter/impeller/renderer/allocator.cc
@@ -15,7 +15,7 @@ bool Allocator::RequiresExplicitHostSynchronization(StorageMode mode) {
     return false;
   }
 
-#if FML_OS_IOS
+#if OS_IOS
   // StorageMode::kHostVisible is MTLStorageModeShared already.
   return false;
 #else   // OS_IOS
diff --git a/engine/src/flutter/impeller/renderer/platform.h b/engine/src/flutter/impeller/renderer/platform.h
index 1ca8133c328..464d47451ac 100644
--- a/engine/src/flutter/impeller/renderer/platform.h
+++ b/engine/src/flutter/impeller/renderer/platform.h
@@ -12,7 +12,7 @@
 namespace impeller {
 
 constexpr size_t DefaultUniformAlignment() {
-#if FML_OS_IOS
+#if OS_IOS
   return 16u;
 #elif FML_OS_MACOSX
   return 256u;
diff --git a/engine/src/flutter/impeller/tools/build_metal_library.py b/engine/src/flutter/impeller/tools/build_metal_library.py
index ef4913f72a2..4e18d09e331 100644
--- a/engine/src/flutter/impeller/tools/build_metal_library.py
+++ b/engine/src/flutter/impeller/tools/build_metal_library.py
@@ -74,6 +74,7 @@ def Main():
   elif args.platform == "ios":
     command += [
       "--std=ios-metal1.2",
+      "-mios-version-min=10.0",
     ]
 
   if args.optimize: