From f88fb628ff5dc17aff246e3bb42061dde5e19878 Mon Sep 17 00:00:00 2001
From: Adam Gastineau <adam@agg.im>
Date: Thu, 20 Aug 2026 09:53:44 -0700
Subject: [PATCH] chore(mobile): patch Flutter to allow building against iOS
 simulator (#30821)

* chore(mobile): patch Flutter to allow building against iOS simulator

* Fixed mise script path
---
 mobile/ios/scripts/xcode_flutter_patch.sh | 24 +++++++++++++++++++++++
 mobile/mise.toml                          |  5 ++++-
 2 files changed, 28 insertions(+), 1 deletion(-)
 create mode 100755 mobile/ios/scripts/xcode_flutter_patch.sh

diff --git a/mobile/ios/scripts/xcode_flutter_patch.sh b/mobile/ios/scripts/xcode_flutter_patch.sh
new file mode 100755
index 0000000000..95c92d0b49
--- /dev/null
+++ b/mobile/ios/scripts/xcode_flutter_patch.sh
@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+# Makes Flutter not incorrectly append `-sdk` arguments to simulator builds
+# This breaks macros that must build for the host's platform
+#
+# Flutter was informed of this (https://github.com/flutter/flutter/issues/146122) but has not fixed it in 2 years
+
+set -eu
+sdk="${MISE_TOOL_INSTALL_PATH:-$(mise where aqua:flutter/flutter)}/flutter"
+mac_dart="$sdk/packages/flutter_tools/lib/src/ios/mac.dart"
+
+pattern="buildCommands.addAll(<String>['-sdk', XcodeSdk.IPhoneSimulator.platformName]);"
+
+# Filter out the sdk arg pattern
+if awk -v pat="$pattern" 'index($0, pat) { found=1; next } { print } END { exit !found }' "$mac_dart" > "$mac_dart.tmp"; then
+  # If it was filtered out, apply it
+  mv "$mac_dart.tmp" "$mac_dart"
+
+  # Force flutter itself to rebuild
+  rm -f "$sdk/bin/cache/flutter_tools.snapshot" "$sdk/bin/cache/flutter_tools.stamp"
+
+  echo "flutter postinstall: removed simulator -sdk flag from xcodebuild invocation"
+else
+  rm -f "$mac_dart.tmp"
+fi
diff --git a/mobile/mise.toml b/mobile/mise.toml
index d8ddc8ab21..d16578f142 100644
--- a/mobile/mise.toml
+++ b/mobile/mise.toml
@@ -1,7 +1,10 @@
 [tools]
-"aqua:flutter/flutter" = "3.44.9"
 java = "21.0.2"
 
+[tools."aqua:flutter/flutter"]
+version = "3.44.9"
+postinstall = "bash {{config_root}}/ios/scripts/xcode_flutter_patch.sh"
+
 [tools."github:CQLabs/homebrew-dcm"]
 version = "1.37.0"
 bin = "dcm"